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(11) | EP 4 177 987 A8 |
(12) | CORRECTED EUROPEAN PATENT APPLICATION |
published in accordance with Art. 153(4) EPC |
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(54) | HIGH-NICKEL POSITIVE ELECTRODE ACTIVE MATERIAL, PREPARATION METHOD THEREOF, LITHIUM ION BATTERY COMPRISING SAME, BATTERY MODULE, BATTERY PACK AND ELECTRICAL DEVICE |
(57) The present application provides a high-nickel ternary positive electrode active
material, which comprises a core Li1+a[LixCoyMnzMb]O2, a fast ionic conductor LiαAlXSiYO4 of a first shell layer, an oxide of an element R of a second shell layer, and a transition
layer LipRqOw formed between the first shell layer and the second shell layer. In the high-nickel
ternary positive electrode active material of the present application, the surface
impurity lithium amount is significantly reduced, and by creatively converting the
surface impurity lithium into effective components in the fast ionic conductors LiαAlXSiYO4 and LipRqOw which accelerate the intercalation/deintercalation of lithium ions in the core material,
the decomposition and gas production of an electrolyte solution caused by the surface
impurity lithium is greatly improved, such that a high-nickel ternary lithium-ion
battery has high energy density as well as good cycle performance and safety performance.
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