The US Army RDECOM seeks a partner to license and commercialize a facile synthesis route to a family of halogen modified lithium-manganese (Li-Mn) spinel materials suitable for use as cathodes in rechargeable lithium electrochemical systems
By introducing halogens into the starting material mixture and subsequently into the final product, the synthesis process time of lithium manganese-based spinel materials was reduced by at least an order of magnitude – from ~ 50 hours to less than 4 hours. In addition, the preparation is performed at relatively low temperatures, affording better control and high yield rates by minimizing temperature gradients within the mixture during processing. This synthesis method uses commonly available chemicals, is conducted in an open atmosphere, and is compatible with existing cathode manufacturing practices.
Tested as cathodes, these materials have shown to be very robust against over and under voltage compared to conventional Li-Mn spinel, leading to improved cycle life; other cathode performance characteristics are not compromised by the addition of halogens.
- Fast and easy process: Spinel formation is reduced from ~ 50 hours to less than 4 hours and synthesis is carried out in an open atmosphere
- Better yield: The calcination temperature using this inventive method is about 600oC compared to 800oC for previous solid state synthesis – resulting in reduced temperature gradients and better control of the process
- Improved cycle life: 1.5X to 2X of conventional Li-Mn spinel
- Performance: reversible between 2 and 5.2V; specific capacity ~100mAh/g
- US Patents 8,597,377; 8,900,752; 8,900,756; and US Patent Application 14/497,620 are available for license and commercialization
- Ongoing research and potential for collaboration with Army research team
- Patent, scientific publications, and sample materials are available for review