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A kind of positive plate and battery

A positive electrode sheet and positive active material technology, applied in the field of positive electrode sheets and batteries, can solve the problems of high energy density and good cycle performance, and achieve good cycle performance, avoid energy density and high energy density.

Active Publication Date: 2022-04-12
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention provides a positive electrode sheet and a battery to solve the problem that the battery is difficult to balance high energy density and good cycle performance while improving safety.

Method used

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  • A kind of positive plate and battery

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Effect test

preparation example Construction

[0039] An embodiment of the present invention provides a method for preparing a positive electrode sheet.

[0040] The preparation method of positive plate comprises:

[0041] providing a current collector 10;

[0042] forming a transition layer 20 on at least one side surface of the current collector 10;

[0043] Forming an active layer 30 on the surface of the transition layer 20 away from the current collector 10;

[0044] Wherein, the transition layer 20 includes nickel-cobalt-manganese ternary material particles, and the active layer 30 includes positive electrode active material particles; wherein, the thickness ratio of the transition layer 20 on the same side of the current collector 10 and the active layer 30 is 1:20- 1:2; the shortest distance from the largest particle of the nickel-cobalt-manganese ternary material particles in the transition layer 20 on the same side of the current collector 10 to the current collector 20 is L1, and the nickel in the transition l...

Embodiment 1

[0057] Preparation of positive electrode sheet:

[0058] Disperse nickel-cobalt-manganese ternary material particles, binder PVDF (polyvinylidene fluoride), and conductive carbon black in N-methylpyrrolidone to obtain a uniform transition layer slurry; in the transition layer slurry, the solid component contains 85wt % lithium iron phosphate, 10wt% binder PVDF and 5wt% conductive carbon black;

[0059] Lithium cobaltate, binder PVDF and conductive carbon black are dispersed in N-methylpyrrolidone to obtain a uniform active slurry; in the active slurry, the solid component contains 97wt% lithium cobaltate, 2wt% binder PVDF and 1wt% conductive carbon black;

[0060] Apply the above prepared two kinds of slurry to the same side of the aluminum foil (current collector) at the same time, apply the transition layer slurry to the upper side of the current collector to form a transition coating, and apply the active slurry to the transition coating to form Active coating, after dryi...

Embodiment 2

[0067] The difference between Example 2 and Example 1 is that the thickness of the transition coating on one side of the current collector aluminum foil after drying is 10±1um.

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Abstract

The invention provides a positive electrode sheet and a battery. The positive electrode sheet includes: a current collector, a transition layer is provided on at least one surface of the current collector, an active layer is provided on the surface of the transition layer away from the current collector, and the transition layer includes Nickel-cobalt-manganese ternary material particles, the active layer includes positive electrode active material particles; the ratio of the thickness of the transition layer on the same side of the current collector to the active layer is 1:20‑1:2; the transition layer on the same side of the current collector The shortest distance from the largest particle to the current collector is L1, and the largest distance from the largest particle in the transition layer on the same side of the current collector to the upper surface of the active layer is L2, and 12%≤L1 / L2≤55%. Applying the positive electrode sheet to the lithium-ion battery can ensure the safety of the battery through the transition layer, avoiding the reduction of the energy density of the battery and the cycle performance of the battery, so that the battery can simultaneously take into account high safety, high energy density and good cycle performance to meet actual needs .

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a positive electrode sheet and a battery. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, notebook computers, electric vehicles and other fields. However, when lithium-ion batteries are subjected to abnormal conditions such as extrusion, collision or puncture, they are easy to catch fire and explode, causing serious harm. Therefore, lithium-ion batteries The battery safety problem has largely limited the application and popularization of lithium-ion batteries. When increasing the safety of the battery, it is easy to cause a large sacrifice in electrical performance and energy density, which reduces the energy density and cycle performance of the battery. Therefore, there is an urgent need for lithium-ion batteries that can simultaneously take into account high safety, high energy density, and good cycle performance. Battery. Contents of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/131H01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 彭冲杨帆张健
Owner ZHUHAI COSMX BATTERY CO LTD
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