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Positive electrode material, positive electrode plate and lithium ion battery

A technology for lithium-ion batteries and cathode materials, applied in batteries, battery electrodes, secondary batteries, etc., can solve problems such as insufficient compaction density and safety performance, and achieve improved fragility, high compaction density, and good structural stability Effect

Inactive Publication Date: 2020-09-11
GUANGZHOU AUTOMOBILE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems of insufficient compaction density and insufficient safety performance of the existing lithium-ion battery high-nickel ternary positive electrode materials, the invention provides a positive electrode material, a positive electrode sheet and a lithium-ion battery

Method used

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  • Positive electrode material, positive electrode plate and lithium ion battery
  • Positive electrode material, positive electrode plate and lithium ion battery

Examples

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Embodiment 1

[0051] This embodiment is used to illustrate the positive electrode material, positive electrode sheet, lithium ion battery and preparation method thereof disclosed in the present invention, including the following steps:

[0052] (1) Preparation of positive pole piece

[0053] The positive active material is secondary spherical LiNi with D50=10.5 μm 0.8 co 0.1 mn 0.1 o 2 and D50=5.0μm single crystal LiNi 0.83 co 0.12 mn 0.05 o 2 Mix evenly at a ratio of 7:3, and measure the compacted density of the mixed powder to be 3.48g / cm 3 . Mix the powder with conductive carbon black super-P, multi-walled CNT, and binder PVDF according to the mass fraction of 96.5:1.0:0.8:1.7, add an appropriate amount of N-methylpyrrolidone (NMP), and disperse it in a high-speed disperser until the viscosity is high. 3000-6000mPa·S to obtain positive electrode slurry. The above positive electrode slurry was evenly coated on an aluminum foil current collector with a thickness of 14 μm, and the...

Embodiment 2

[0059] This embodiment is used to illustrate the positive electrode material, positive electrode sheet, lithium ion battery and preparation method thereof disclosed in the present invention, including most of the operating steps in Example 1, the difference being:

[0060] In the preparation of the positive pole piece:

[0061] The positive active material is secondary spherical LiNi with D50=11.3μm 0.83 co 0.12 mn 0.05 o 2 and D50=4.8μm single crystal LiNi 0.83 co 0.12 mn 0.05 o 2 Mix evenly at a ratio of 8:2, and measure the compacted density of the mixed powder to be 3.51g / cm 3 .

Embodiment 3

[0063] This embodiment is used to illustrate the positive electrode material, positive electrode sheet, lithium ion battery and preparation method thereof disclosed in the present invention, including most of the operating steps in Example 1, the difference being:

[0064] In the preparation of the positive pole piece:

[0065] The positive active material is secondary spherical LiNi with D50=9.8μm 0.6 co 0.2 mn 0.2 o 2 and D50=6.0μm single crystal LiNi 0.6 co 0.2 mn 0.2 o 2 Mix evenly at a ratio of 9:1, and measure the compacted density of the mixed powder to be 3.45g / cm 3 .

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Abstract

In order to overcome the problems of insufficient compaction density and safety performance of the existing high-nickel ternary cathode material of the lithium ion battery, the invention provides a positive electrode material which comprises a positive electrode active material. The positive electrode active material comprises a secondary spherical nickel-cobalt-manganese ternary material and a single crystal nickel-cobalt-manganese ternary material which are mixed with each other, and the molar ratio of the secondary spherical nickel-cobalt-manganese ternary material to the single crystal nickel-cobalt-manganese ternary material is 1: 1-9: 1. Meanwhile, the invention also discloses a positive pole piece and a lithium ion battery comprising the positive pole material. The positive electrode material provided by the invention not only ensures the advantage of high gram volume of the nickel-cobalt-manganese ternary material, but also has good structural stability, overcomes the defects that the nickel-cobalt-manganese ternary material is easy to break and low in thermal decomposition temperature, and has higher thermal stability and higher compaction density.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode material, a positive electrode sheet and a lithium ion battery. Background technique [0002] A lithium-ion battery is a secondary battery that relies on the migration of lithium ions between the positive and negative electrodes. As an efficient energy storage device, lithium-ion batteries are widely used in consumer electronics, new energy vehicles, energy storage and other fields. At present, the more researched lithium ion battery cathode materials include lithium cobalt oxide, lithium nickel cobalt manganate ternary material, nickel cobalt lithium aluminate ternary material, lithium manganese oxide, lithium iron phosphate, etc. [0003] In the field of new energy vehicle power batteries, lithium iron phosphate and ternary materials are the most widely used. Among them, lithium iron phosphate has the advantages of high safety an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/131H01M10/0525
CPCH01M4/131H01M4/364H01M4/505H01M4/525H01M10/0525H01M2220/20Y02E60/10
Inventor 李扬李根梅骜唐道平
Owner GUANGZHOU AUTOMOBILE GROUP CO LTD
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