Lithium ion positive electrode coating and lithium ion battery

A lithium-ion battery and lithium-ion technology, applied in the coating of electrode collectors, secondary batteries, battery electrodes, etc., can solve the problem of reduced battery discharge capacity, achieve reduced resistance, high lithium salt concentration, and high conductivity Effect
CN110911644AInactive Publication Date: 2020-03-24SHENZHEN ZHUONENG NEW ENERGY TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN ZHUONENG NEW ENERGY TECH
Publication Date
2020-03-24
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a lithium ion positive electrode coating and a lithium ion battery. A modified lithium iron phosphate material is selected as a positive electrode active material of the lithium ion positive electrode coating, and manganese, cobalt, nickel and other elements are doped, so that the impedance of lithium iron phosphate is reduced, the electronic conductivity and lithium ion conductivity of lithium iron phosphate are improved, and free and rapid migration of lithium ions is realized under a low-temperature condition; the conductive adhesive is uniformly dispersed among thepositive active substances and between the positive active substances and the current collector to play a role in adhesion; the conductive binder has lithium carboxylate and hydroxyl lithium functional groups, so that the conductive binder has conductivity; the conductive adhesive and the conductive material are fully and uniformly mixed by ultrasonic waves, so that the conductivity is improved; and a complete and dense three-dimensional conductive network is formed under the synergistic effect of a conductive agent added in the homogenizing process, so that the resistance of the lithium ion positive electrode coating is reduced, and the low-temperature discharge performance of the lithium ion battery taking the lithium ion battery positive plate coated with the lithium ion positive electrode coating as the positive electrode is improved.
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Description

technical field

[0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to a lithium-ion positive electrode coating and a lithium-ion battery. Background technique

[0002] Lithium-ion batteries have been widely used in consumer electronics and electric vehicles due to their advantages such as high energy density, small size and light weight, long cycle life, and no memory effect.

[0003] However, since lithium-ion batteries are extremely sensitive to operating temperature, the battery discharge capacity of lithium-ion batteries is greatly reduced in an environment below 0Β°C, which limits its application in northern regions. Contents of the invention

[0004] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a lithium-ion positive electrode coating and a lithium-ion battery, which can improve the discharge capacity of the lithium-ion battery in a low-temperature environme...

Claims

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