Use of lithium borate in non-aqueous rechargeable lithium batteries
OwnerMeijie Zhanginventor
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Abstract
The loss in delivered capacity (fade) after cycling non-aqueous rechargeable lithium batteries can be reduced by incorporating a cathode powder with LiCoO2type-structure that has been mixed and heat-treated with a small amount of lithium borate. The invention is particularly suited to lithium ion batteries.
Claims26
A non-aqueous rechargeable lithium battery having reduced capacity fade rate during cycling, the battery including a lithium insertion compound cathode, a lithium or lithium compound anode, a separator, a non-aqueous electrolyte including a lithium salt dissolved in a non-aqueous solvent, and an amount of lithium borate dispersed on the surface of the active cathode material wherein:
- lithium borate is mixed with the lithium insertion compound cathode and heated to a temperature in the range between 250° C. to less than 650° C.
A method for reducing the capacity fade rate during cycling of a non-aqueous rechargeable lithium battery, the battery having a lithium insertion compound cathode, a lithium or lithium compound anode, a separator, and a non-aqueous electrolyte including a lithium salt dissolved in a non-aqueous solvent, and an amount of lithium borate in the cathode, wherein lithium borate is mixed with the lithium transition metal oxide cathode and heated to a temperature in the range between 250° C. and less than 650° C.
Dependencies are inferred from the claim text.