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Positive pole piece and preparation method thereof and lithium ion secondary battery

A technology of positive electrode sheet and positive electrode film, which is applied in the field of electrochemistry, can solve the problems of reducing the service life of lithium-ion secondary batteries, poor thermal stability of secondary particle polycrystalline, poor structural stability, etc., achieve excellent kinetic performance, improve The effect of market competitiveness and good thermal stability

Pending Publication Date: 2020-09-08
LISHEN (QINGDAO) NEW ENERGY CO LTD
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Problems solved by technology

However, the structural stability of the secondary particle polycrystalline material is poor. During the battery cycle, especially in the high temperature cycle, it is easy to produce gas by side reaction with the electrolyte, thereby reducing the service life of the lithium-ion secondary battery.
[0004] In addition, the secondary particle polycrystalline LiNi with the same nickel content x co y mn 1-x-y o 2 The oxygen evolution peak temperature of the material is lower than that of the primary particle single crystal material, so the thermal stability of the secondary particle polycrystal is poor
[0005] Although the primary particle single crystal LiNi x co y mn 1-x-y o 2 Less side reactions between materials and electrolytes, good thermal stability, but low energy density, poor kinetic performance, and high production costs

Method used

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  • Positive pole piece and preparation method thereof and lithium ion secondary battery
  • Positive pole piece and preparation method thereof and lithium ion secondary battery

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preparation example Construction

[0060] In order to prepare the positive electrode sheet provided by the present invention above, see figure 1 Shown, the present invention also provides a kind of preparation method of positive pole piece, comprises the following steps:

[0061] The first step, homogenization: mix the positive electrode active material, conductive agent, and binder according to the preset mass ratio, and stir evenly, then dissolve it in the solvent for dispersion, and adjust the amount of the positive electrode slurry by adjusting the amount of solvent added. The solid content of the slurry is 65±5% or the viscosity of the slurry is 4500±500cp.

[0062] The second step, coating: uniformly coat the slurry on the positive electrode current collector, and fully dry it in an oven to remove the solvent in the pole piece, and obtain a positive pole piece with a positive pole membrane on the surface;

[0063] The third step, rolling: rolling the dried positive electrode sheet with the positive elect...

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Abstract

The invention discloses a positive pole piece which comprises a positive pole current collector and a positive pole diaphragm arranged on at least one surface of the positive pole current collector, and the positive pole diaphragm comprises a positive pole active substance; the positive electrode active substance comprises at least two lithium nickel cobalt manganese oxides LiNixCoyMn1-x-yO2 withdifferent morphologies and average particle sizes D50, wherein one type is primary particle single crystal LiNixCoyMn1-x-yO2, and the other type is secondary particle polycrystalline LiNixCoyMn1-x-yO2; the weight ratio [omega] of the single crystal to the polycrystalline LiNixCoyMn1-x-yO2 satisfies the relational expression: 0.1<=[omega]<=9. By adjusting the ratio of the primary particle single crystal to the secondary particle polycrystalline material and the nickel content, the positive pole piece can have better thermal stability and excellent dynamic performance, so that the lithium ion secondary battery based on the positive pole piece has the characteristics of long cycle life at normal temperature and high temperature.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a positive pole piece, a preparation method thereof and a lithium ion secondary battery. Background technique [0002] New energy vehicles that use electric drives to replace traditional fuel-powered vehicles have the advantages of energy saving, environmental protection, and comfort. However, service life, safety, charging speed, mileage and battery costs still restrict the wide application of electric vehicles. [0003] In order to increase the rate of lithium-ion batteries and reduce the internal resistance of batteries, researchers usually use secondary particle polycrystalline LiNi x co y mn 1-x-y o 2 The material is used as the positive electrode material of lithium ion battery. However, the structural stability of the secondary particle polycrystalline material is poor, and it is easy to produce gas by side reaction with the electrolyte during the battery cycl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/36H01M4/505H01M4/525H01M10/0525H01M4/1391
CPCH01M4/131H01M4/1391H01M4/362H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 李先强曾涛秦红莲霍然刘英博魏得勋
Owner LISHEN (QINGDAO) NEW ENERGY CO LTD
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