Method for reducing surface alkalinity of high-nickel positive electrode material and the positive electrode material and lithium battery

A positive electrode material, surface alkaline technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of affecting the electrochemical performance of materials, destroying the crystal structure of materials, and having no electrochemical activity, so as to improve the electrochemical performance of cycles. Performance, simple process, and the effect of improving processing performance

CN110828807BActive Publication Date: 2022-04-15TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
Publication Date: 2022-04-15

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Abstract

The invention belongs to the technical field of lithium ion batteries, and relates to a method for reducing the surface alkalinity of a high-nickel positive electrode material, the positive electrode material and a lithium battery. The method for reducing the surface alkalinity of a high-nickel positive electrode material provided by the present invention is to mix an alcohol solution of lithium salt and manganese salt mixed in a certain molar ratio with a high-nickel ternary, dry and sinter to obtain Li x MnO 2 Wrapped high nickel cathode material. The method provided by the invention can avoid the damage to the surface structure of the material caused by a large amount of water for a long time and the loss of raw materials, and greatly improve the electrochemical performance such as the cycle of the material; in addition, it can effectively reduce the amount of residual alkali on the surface of the material, the process is simple, and the process Easy to control, suitable for large-scale production.

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Description

technical field

[0001] The invention belongs to the field of lithium batteries, and in particular relates to a method for reducing the surface alkalinity of a high-nickel positive electrode material, the positive electrode material and a lithium battery. Background technique

[0002] Lithium battery cathode materials, especially high-nickel ternary NCM / NCA materials, due to the residual LiOH and Li 2 CO 3 The high impurity content (>0.7wt%) will seriously affect the pulping and coating process of the positive electrode of the battery, and will also affect the safety and cycle performance of the battery. The existing standard process: water washing or water washing + coating has a more obvious effect in removing alkaline lithium-containing impurities, but there are also obvious disadvantages. For example, the existing water washing and coating process will sacrifice the electrochemical performance of the material (capacity reduction , cycle becomes worse), especially for...

Claims

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