Lithium Sulfur is perhaps the most mature of the beyond Li-ion’ battery chemistries with a potential energy density of >600Wh/kg. Also with the potential for substantially reduced costs and improved safety. However, a number of challenges mean that cycle life has been poor. Hence the potential attracts attention and much needed research at the fundamental chemistry stage.
Lithium Sulfur Battery Chemistry Introduction
Lithium Sulfur batteries is one of the promising battery chemistry of the future. This battery chemistry is particularly suitable in the Energy storage systems due to superior theoretical capacity, cost effectiveness and eco friendliness.
- Theoretical Specific Capacity: 1675 mAh/g
- Energy Density 2600 Wh/kg
Today the LI-Ion batteries Cathode is made of various chemistries NMC (Nickel Manganese Cobalt) one of the popular ones. Sulfur as Cathode is a much cheaper option as Sulfur is widely available.
As compared to Lithium Ion Chemistry, Energy density for Li-S is 10 times theoretically. (2600Wh/Kg vs 260/270 Wh/kg)
General Information, benefits, cons and Future Developments
Lithium-sulfur (Li-S) batteries have emerged as a promising chemistry for electric vehicle (EV) batteries due to several compelling reasons. Unlike traditional lithium-ion batteries, Li-S batteries boast a higher energy density, offering a greater storage capacity for the same weight. This translates to increased driving range for EVs, addressing a critical concern for consumers. Additionally, sulfur is abundant and cost-effective, contributing to the overall affordability of Li-S batteries.
Future developments in Li-S battery technology focus on enhancing their cycle life and addressing sulfur’s tendency to dissolve during charge and discharge cycles, leading to capacity loss. Researchers are exploring advanced materials and innovative designs to mitigate these challenges. If successful, Li-S batteries could revolutionize the EV industry by offering lighter, more efficient, and cost-effective energy storage solutions.
Benefits of Li-S batteries include reduced environmental impact, given the abundance of sulfur and the potential for lower manufacturing costs. However, challenges such as limited cycle life and the need for further research and development remain hurdles to widespread adoption. As technology advances, the feasibility of Li-S batteries in EVs continues to captivate researchers and industry stakeholders alike, holding the promise of a cleaner, more sustainable transportation future.
Challenges with the current Li-S cells:
- Poor cycle life ~100 cycles
- Low power capability compared to lithium-ion
- Maximum operating temperature ~40°C
- Low maximum charge rate ~1C
- Energy density not meeting projected values – the EU project ALISE [2] targeted 550Wh/litre and 500Wh/kg at cell level, however, they achieved 340Wh/litre and 325Wh/kg
References:
- LiSTAR – The Faraday Institution’s LiSTAR project is designed to address these challenges. The consortium will generate new knowledge, materials and engineering solutions, thanks to its dual focus on fundamental research at material and cell level, and an improved approach to system engineering.
- ALISE – Advanced Lithium Sulphur battery for xEV, an EU Horizon 2020 project (CORDIS project ID 666157) reporting page.