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Coming unstuck – change of glue to lengthen lithium life?

Thu, 08/22/2013 - 14:47 -- Ruth Williams

Research scientists at Stanford Linear Accelerator Centre (SLAC) have found using a different binding agent in the cathode resulted in five times longer lithium-ion battery life.

The researchers were looking at improving the cathode by using lithium sulfide instead of sulphur, it binds strongly with intermediate polysulfide molecules that dissolve out of the cathode and diminish the battery's storage capacity and useful lifetime.

The new binder – known as PVP – retained 94% of the energy storage capacity of cells over 100 charge/discharge cycles, compared to 72% for cells using a conventional binder. After 500 cycles, it maintained 69% capacity.

The professor who led the research, Yi Cui, said the PVP has a strong affinity for lithium sulfide and when combined they form a fine-grained lithium-sulfide/carbon composite. The previous binder material tended to clump together which hindered the lithium-ions movement, but the fine-grain composite allows lithium-ions to penetrate the active material in the cathode far more easily.

Polymer lithium-sulphur battery for commercialisation by OXIS and GP Batteries

Thu, 01/31/2013 - 17:36 -- Ruth Williams

OXIS Energy, UK, and GP Batteries, of Singapore, are embarking on a joint manufacturing project to make lithium-sulphur (Li-S) battery systems on a commercial scale for use in defence, automotive and solar panel markets.

The joint venture is expected to accelerate the Li-S cells and battery system to a commercial scale, as made by OXIS and mass produced by GP Batteries. OXIS has been developing the Li-S batteries since 2004 for the broad electric vehicle market as well as aviation and defence applications.

"Lithium-sulphur polymer batteries could well be the long sought after technology which will correct many of the deficiencies and shortcomings of the present generation of lithium-ion batteries, such as safety", said GP Batteries Chairman and Chief Executive Andrew Ng.

OXIS and GP Batteries are establishing a joint board to review the developments and improvements in the emerging technology for presentation to customers.

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