A positive pole piece and electrochemical device

A technology of positive pole piece and positive active material, applied in the field of electrochemistry, can solve the problems of deterioration of electrical performance, loss of PTC effect, loss of safety performance, etc.

Active Publication Date: 2021-06-08
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yet in this improved mode, when coating active material slurry on the surface of PTC material layer, the solvent (such as NMP etc.) in the slurry will make the PTC material (usually polyethylene, polypropylene or ethylene propylene) in the PTC layer Copolymers and other materials) dissolve and enter the upper active material layer, which not only makes the PTC layer lose the PTC effect, but also deteriorates the electrical properties
In addition, during the compaction step in the pole piece manufacturing process, the PTC material layer is easily squeezed to the edge, resulting in direct contact between the electrode active material layer and the metal current collector, thereby losing the effect of improving safety performance.
This traditional PTC material layer has been proven not suitable for high nickel ternary materials

Method used

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  • A positive pole piece and electrochemical device
  • A positive pole piece and electrochemical device
  • A positive pole piece and electrochemical device

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Embodiment

[0062] In order to make the object, technical solution and beneficial technical effect of the present invention clearer, the present invention will be further described in detail below in conjunction with examples. However, it should be understood that the embodiments of the present invention are only for explaining the present invention rather than limiting the present invention, and the embodiments of the present invention are not limited to the embodiments given in the specification. The experimental conditions not indicated in the examples adopt conventional conditions, or adopt the conditions recommended by material suppliers or equipment suppliers.

[0063] 1. Preparation method

[0064] 1.1 Preparation of positive electrode sheet

[0065] 1) Safety coating:

[0066] Depending on whether the polymer matrix material in the security coating is cross-linked or not, the security coating is prepared by one of the following two methods.

[0067] Without cross-linking the po...

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Abstract

The invention relates to a positive pole piece and an electrochemical device. The positive electrode sheet includes a metal current collector, a positive electrode active material layer, and a safety coating disposed between the metal current collector and the positive electrode active material layer. The safety coating includes a polymer matrix, a conductive material and an inorganic filler, and the positive electrode active material layer contains Li 1+ x Ni a co b Me (1‑a‑b) o 2 , where ‑0.1≤x≤0.2, 0.6≤a<1, 0

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and more specifically, the invention relates to a positive pole piece and an electrochemical device comprising the positive pole piece. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics due to their advantages such as high energy density, high output power, long cycle life and low environmental pollution. [0003] At present, ternary materials have become one of the main positive electrode materials used in commercial lithium-ion batteries, especially in the field of lithium-ion batteries for electric vehicles. High-nickel ternary materials (such as NCM622 and NCM811) are expected to become the main cathode materials for a new generation of lithium-ion batteries for electric vehicles due to their high energy density. However, the thermal stability of high-nickel ternary materials is poor, and strong oxidizing substances wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/62H01M4/36H01M4/505H01M4/525H01M10/0525H01M10/42
CPCH01M4/131H01M10/0525H01M10/4235H01M4/366H01M4/628H01M4/525H01M4/505H01M2004/028Y02E60/10H01M10/052H01M4/661H01M4/667H01M4/668H01M4/663H01M4/80H01M4/808H01M4/133H01M4/134H01M4/137H01M4/626H01M2220/20
Inventor 李伟薛庆瑞李静张子格徐建宝
Owner CONTEMPORARY AMPEREX TECH CO
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