Abuse-tolerant lithium ion battery cathode blends with symbiotic power performance benefits
OwnerWesley Hoffert, Derek Johnson +4inventors
InventorsWesley Hoffert, Derek Johnson, Brian Chiou, Maha Rachid Hammoud, Chuanjing Xu, Theodore Grimm
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Abstract
Methods and systems are provided for a blend of cathode active materials. In one example, the blend of cathode active materials provides a high power battery with low direct current resistance while improving lithium ion cell safety performance. Methods and systems are further provided for fabricating the cathode active material blend and a battery including the blend.
Claims21
A blended cathode active material for a lithium ion battery, the blended cathode active material comprising:
- a lithium iron manganese phosphate (LFMP), the LFMP comprising a molar ratio of Mn of greater than 0.60 and less than 0.70;
- and
- a lithium nickel cobalt manganese oxide (NCM), wherein
- there is less of the LFMP than the NCM by weight.
(canceled)
A method, comprising:
- mixing a first amount of a lithium iron manganese phosphate with a solvent to obtain a mixture, the lithium iron manganese phosphate comprising a molar ratio of Mn of greater than 0.60 and less than 0.70;
- adding a conductive carbon to the mixture;
- adding a binder to the mixture;
- adding a second amount of a lithium nickel cobalt manganese oxide to the mixture, the second amount of the lithium nickel cobalt manganese oxide being greater by weight than the first amount of the lithium iron manganese phosphate;
- casting the mixture onto a current collector;
- evaporating the solvent from the mixture to obtain a dried blended active material;
- and
- calendering the dried blended active material.
A lithium-ion battery, comprising:
- a cathode and an anode in communication via an electrolyte, wherein
- the cathode comprises a lithium iron manganese phosphate (LFMP) and a lithium nickel cobalt manganese oxide (NCM), wherein
- there is more of the NCM than the LFMP;
- and wherein
- the LFMP comprises a molar ratio of Mn of greater than 0.60 and less than 0.70.
Dependencies are inferred from the claim text.