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What is a lithium-sulfur battery for EVs? Written bySherjeel Sajid 22/08/2026 A lithium-sulfur (Li-S) battery uses sulfur as the cathode material and lithium metal as the anode, achieving a theoretical energy density of approximately 2,500 Wh/kg - roughly 4-8x higher than current lithium-ion batteries. Sulfur costs just $0.57/kg and is one of the most abundant elements on Earth - making lithium-sulfur potentially far cheaper and more sustainable than cobalt- or nickel-based lithium-ion chemistries. However, lithium-sulfur batteries face fundamental chemistry challenges - particularly the "polysulfide shuttle effect" - that have prevented commercial EV deployment despite decades of research. Stellantis and Zeta Energy are targeting 2030 for commercial EV applications. Lyten is building a lithium-sulfur gigafactory near Reno, Nevada. Another exotic conversion chemistry chasing similar energy density gains is explored in its guide on what a lithium-air battery is. How lithium-sulfur batteries work. Lithium-sulfur batteries use a fundamentally different electrochemical mechanism than lithium-ion batteries. Rather than lithium ions intercalating into a structured cathode material (as in graphite anodes) or forming a stable alloy (as in silicon anodes), the Li-S reaction is a conversion reaction - sulfur is chemically converted through a series of intermediate compounds as it reacts with lithium: During discharge: Elemental sulfur (S[8]) reacts with lithium ions to form lithium polysulfides (Li[2]S[8] | Li[2]S[6] | Li[2]S[4] | Li[2]S[2] | Li[2]S). The final product, lithium sulfide (Li[2]S), is the fully discharged state. During charging, this reaction reverses - Li[2]S is oxidized back toward elemental sulfur. The entire series of conversion reactions involves significantly more lithium per gram of cathode material than intercalation reactions in NMC or LFP - which is why Li-S achieves such exceptional theoretical capacity (1,675 mAh/g for sulfur) and energy density (~2,500 Wh/kg theoretical). The practical cell energy density achievable with current Li-S technology is approximately 350-500 Wh/kg - well above current NMC (220-260 Wh/kg) but below the theoretical maximum due to engineering losses. This is still 35-100% better than current production NMC cells and would enable EVs with 500-700+ miles of range from a standard-size pack. Why lithium-sulfur is so attractive. * Extraordinary energy density: Theoretical 2,500 Wh/kg - 4-8x current lithium-ion. Practical target 350-500 Wh/kg - still 35-100% above current NMC 811 * Sulfur cost: $0.57/kg - essentially zero cost compared to nickel ($16-18/kg), cobalt ($30-40/kg), or lithium carbonate ($15,000-80,000+/tonne). Sulfur is a byproduct of petroleum refining - abundantly available globally * No cobalt or nickel: Completely eliminates DRC cobalt supply chain concerns and nickel price volatility * Sulfur abundance: Sulfur is one of the most abundant elements on Earth - no supply chain concentration risk comparable to lithium, cobalt, or nickel * Weight advantage: Lighter cathode material means lighter batteries for equivalent energy storage - important for aircraft, delivery drones, and aerospace applications where weight is critical The three core challenges blocking Li-S commercialization. 1. The polysulfide shuttle effect. The polysulfide shuttle effect is lithium-sulfur's defining problem. The intermediate lithium polysulfide compounds (Li[2]S[8], Li[2]S[6], Li[2]S[4]) formed during discharge are highly soluble in liquid electrolytes - they dissolve into the electrolyte and migrate to the lithium metal anode. At the anode, polysulfides react with lithium metal - creating irreversible side products that remove both lithium and sulfur from the active cycling pool. This shuttle effect causes rapid capacity fade with each cycle and significantly reduces Coulombic efficiency (the ratio of energy recovered to energy input). Without effective polysulfide containment, Li-S cells lose 30-50% of their capacity within 50-100 cycles - completely inadequate for EV applications requiring 1,000+ cycles. Solutions being pursued: porous carbon cathode structures that physically confine sulfur and polysulfides; functional separators or interlayers that block polysulfide migration; electrolyte additives that suppress polysulfide solubility; solid electrolytes (where polysulfide dissolution into a liquid phase is impossible); and lithium nitrate (LiNO[3]) anolyte additives that passivate the lithium metal anode against polysulfide attack. None of these solutions has yet achieved adequate containment at commercial cell scale and thousands of cycles simultaneously - but progress is accelerating. 2. Low cycle life. Current commercial-grade lithium-sulfur cells achieve approximately 300-500 cycles to 80% capacity - far below the 1,000-5,000 cycles required for EV applications. The polysulfide shuttle effect is the primary cause, but sulfur's 80% volumetric expansion during lithiation (Li[2]S formation) also contributes - causing mechanical degradation of the cathode structure similar to silicon anode problems. Additionally, the lithium metal anode in Li-S cells suffers the same dendrite formation challenges as in solid-state batteries - consuming lithium metal capacity with each cycle. Some laboratory prototypes have achieved 1,000+ cycles through advanced electrolyte management and interlayer engineering, but these results haven't yet translated to commercial-scale production cells. 3. Sulfur's insulating nature. Elemental sulfur is an electrical insulator - it cannot conduct electrons. The cathode must include conductive carbon materials (typically carbon black or graphene) to provide the electron pathway needed for the electrochemical reaction. This carbon addition adds weight and complexity, and the carbon must be intimately mixed with sulfur to ensure every sulfur particle has electronic contact. Designing sulfur-carbon composite cathode structures that remain electrochemically accessible through hundreds of cycles while tolerating sulfur's volume changes is a significant materials engineering challenge. Solid electrolytes are one of the leading paths to containing the shuttle effect - see its explainer on what a semi-solid-state battery is. Who is developing lithium-sulfur EV batteries? Lithium-Sulfur for aerospace: the first commercial market. Lithium-sulfur's first commercial market is aerospace and aviation - where weight matters far more than cycle life, and where the 300-500 cycle limitation is acceptable for aircraft applications with planned maintenance intervals. Airbus and Oxis Energy (UK) developed Li-S cells targeting aviation applications before Oxis's liquidation in 2021. The underlying technology has continued at successor organizations. For electric aviation applications - eVTOL aircraft, electric regional aircraft - lithium-sulfur's combination of exceptional energy density and low weight makes it uniquely suitable, and cycle life requirements (~200-500 cycles before maintenance checks) match current Li-S capabilities. This aerospace pathway provides a commercial proving ground that will build manufacturing experience and lower costs toward eventual EV adoption. Frequently asked questions. A lithium-sulfur battery uses sulfur as the cathode and lithium metal as the anode - achieving a theoretical energy density of 2,500 Wh/kg (4-8x lithium-ion) through a conversion reaction chemistry rather than intercalation. Sulfur costs $0.57/kg and is abundant globally. Current practical energy density targets are 350-500 Wh/kg - still 35-100% above NMC 811. The main barriers to EV deployment are the polysulfide shuttle effect (causing rapid capacity fade) and short cycle life (300-500 cycles vs EV requirements of 1,000+). When will lithium-sulfur batteries be in EVs? Stellantis and Zeta Energy are targeting commercial EV applications around 2030. Lyten is building a gigafactory near Reno, Nevada with EV production in view by 2027. Aerospace applications are the nearer-term commercial deployment due to lower cycle life requirements. Mainstream EV deployment of lithium-sulfur is more likely 2030-2035, contingent on solving the polysulfide shuttle effect and achieving 1,000+ cycle life at automotive scale. Why is the polysulfide shuttle effect a problem? Intermediate lithium polysulfide compounds formed during Li-S discharge are soluble in liquid electrolytes. They dissolve and migrate to the lithium metal anode, where they react irreversibly - removing both sulfur and lithium from the active battery chemistry. This continuous loss causes rapid capacity fade (30-50% within 50-100 cycles), low Coulombic efficiency, and poor cycle life. Solving the polysulfide shuttle through cathode structure engineering, separator modification, or electrolyte formulation is the central R&D challenge for Li-S battery commercialization. Conclusion. Lithium-sulfur batteries offer a genuinely revolutionary combination of energy density (~2,500 Wh/kg theoretical), raw material cost ($0.57/kg sulfur), and environmental sustainability - representing the most compelling long-term cathode chemistry alternative to lithium-ion. The polysulfide shuttle effect, sulfur volume expansion, and lithium metal anode dendrites have prevented commercial EV deployment despite decades of research. But the pace of materials innovation is accelerating - Lyten's 3D graphene approach, Zeta Energy's carbon nanotube cathode, and solid electrolyte-enabled Li-S designs are all making genuine progress. Commercial EV deployment is targeted by multiple companies for 2028-2030. If the cycle life challenge is solved, lithium-sulfur could eventually make today's 400-mile EVs look short-ranged - enabling an 800+ mile range from the same pack weight. Curious about another emerging cell architecture entirely? See its explainer on what a dual-ion battery chemistry is.

Lyten chosen as the main filament supplier for Modovolo's innovative BFP 3D printing platform. July 25, 2026 Lyten has been chosen as the primary filament provider for Modovolo's innovative BFP 3D printing platform, which aims to transform the production of high-performance parts in sectors like aerospace and automotive. This collaboration leverages Lyten's advanced 3D Graphene(TM) enhanced filaments, particularly the PA1205 filament, which boasts superior strength and lightweight properties compared to traditional carbon fiber options. The BFP 3D printing system developed by Modovolo is designed to facilitate US-sourced, US-manufactured parts, addressing the rising demand for large, complex components that can be produced right at the point of need. This modular and containerized design empowers manufacturers to set up operations wherever required without the constraints of long supply chains. Justin Call, CEO of Modovolo, expressed confidence in Lyten's filaments after an exhaustive search for high-performance materials. The PA1205 filament not only enables the production of lighter and stronger parts but also offers better finish and speed in comparison to competing materials. Lyten's PA1205 filament offers significant advantages including a 100% improvement in X-Y axis tensile strength, a 40% boost in Z-axis strength, and a 50% increase in impact resistance. These properties make it an ideal choice for applications demanding aerospace-grade quality. Dan Cook, CEO of Lyten, emphasized the importance of local sourcing and manufacturing, stating that the partnership with Modovolo aims to demonstrate that high-quality products can be made domestically, fostering resilience in supply chains. The developments with Modovolo's BFP system signifies a shift in how parts can be manufactured and supplied globally, with the capability to quickly establish modular factories anywhere in the world for aviation and industrial-grade components. Modovolo has been utilizing Lyten's filaments in its Lift Quadcopter-X, a versatile drone designed for various applications, from commercial use to defense tasks. The two companies plan to showcase their collaborative work at upcoming aerospace and motorsport events. Have a model ready? Get a price in seconds. Upload your STL or STEP file for an instant, no-obligation quote across every process and material 3D Printing Services offer.

Lyten commits to taking over the Northvolt construction site. After Northvolt's bankruptcy, Lyten takes over the construction site near Heide and plans to produce batteries for a broad range of applications. 01.07.2026 - 11:32 AM View of an access road to the construction site of the insolvent battery manufacturer Northvolt. Photo: Marcus Brandt/dpa After the bankruptcy of Swedish battery manufacturer Northvolt, the takeover of the German construction site near Heide in Schleswig-Holstein by the US company Lyten is progressing. Following the signing of a letter of intent with the state development bank KfW, Northvolt Drei Project GmbH, and its shareholder LG Batterie GmbH, the battery manufacturer is taking over the costs for the preservation and safeguarding of assets, including personnel costs at the German Northvolt subsidiary, as the company announced. In return for covering the ongoing costs, the state of Schleswig-Holstein and Lyten signed an exclusivity agreement. The goal is to conclude a final purchase agreement in the third quarter. Unlike the parent company, the German subsidiary Northvolt Drei did not go bankrupt but was kept afloat by the federal and state governments. According to information from the German Press Agency, Lyten is expected to pay around 60 million euros for the site near Heide. The approximately 100-hectare site with building rights had been valued by auditors at at least 11 million euros after the Northvolt insolvency. Reactions from Lyten, Northvolt, and politics. Schleswig-Holstein's Minister President Daniel Günther (CDU) stated: "This brings months of negotiations about the German Northvolt subsidiary and its site near Heide into the home stretch." Confidentiality was agreed with Lyten regarding details. Lyten CEO and co-founder Dan Cook announced: "We plan to develop Drei as a German hub for clean battery production and industrial manufacturing, which should also house AI infrastructure." The site in Schleswig-Holstein stands out for its high availability of renewable energy and exceptionally skilled regional talent. "For Lyten, this is a long-term investment with a perspective spanning several decades." The head of the German Northvolt subsidiary, Nicolas Steinbacher, emphasized that the letter of intent creates an important basis for a takeover and a new future for the project. "The declaration shows that the site remains attractive and that the team, together with our partners and the region, has created essential foundations that Lyten can build upon with its plans." According to Schleswig-Holstein's Economics Minister Claus Ruhe Madsen (CDU), the goal of the legally non-binding letter of intent is to set down the conditions for the asset acquisition. "The state is not a party to the letter of intent and the subsequent purchase agreements, but together with the federal government it is economically favored." If concluded, the purchase price is to go half to the federal government and half to the state. For the construction of the factory, Northvolt had received a convertible bond of 600 million euros from the state development bank KfW. The federal and state governments each guaranteed half. After the bankruptcy, the federal and state governments could only secure 153 million euros of that. The financial damage for Schleswig-Holstein thus amounts to around 200 million euros. Lyten's plans for the factory. Lyten initially plans to build significantly smaller than Northvolt, which had intended to build a battery factory with 3,000 jobs. In March, Cook announced initial details of his plans after a visit from the state government in Kiel. According to his statements at the time, around 1,000 jobs are to be created on the site initially. However, the business is not planned to depend solely on batteries for electric vehicles, but to produce batteries for a broad range of applications, including defense, stationary energy storage, mobility, and electric vehicles. At the end of February, Lyten completed the acquisition of the insolvent Swedish part of Northvolt - the main factory in Skellefteå and the development center in Västerås. At the Northvolt construction site between Norderwöhrden and Lohe Rickelshof near Heide, extensive earthworks and the installation of power and supply infrastructure had already been completed before the insolvency of Northvolt AB at the start of last year. Opposition criticizes state government. Twice in a short time, the state government has faced criticism for its handling of Northvolt. First, the Court of Audit criticized it for violating budget regulations regarding funding. Then the constitutional court ruled on lawsuits by the FDP and SPD that the government had not adequately informed the state parliament about the risks of the project. On Tuesday, a state parliament committee had already dealt with the topic. Subsequently, the opposition once again criticized a lack of transparency in the state government's handling of the plans. "The decision-making basis is not reliable in this case either, so the state government actually cannot approve the sale. If it does so anyway, it does so blindly - as was the case with the convertible bond," said former Economics Minister Bernd Buchholz (FDP). SPD economic politician Kianusch Stender demanded a reliable decision-making basis. However, there are considerable doubts about that. His SSW colleague Sybilla Nitsch emphasized that after Northvolt, openness would have been the order of the day. Set WiWo as your important news source.