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Battery negative electrode coating, battery negative electrode sheet and manufacturing method thereof, and lithium ion battery

A lithium-ion battery and battery negative electrode technology, applied in the direction of electrode manufacturing, battery electrodes, electrode carriers/collectors, etc., can solve the problems of shortened cycle life of lithium-ion batteries, achieve improved cycle performance, good electrical conductivity, and prolong cycle life Effect

Inactive Publication Date: 2019-06-14
SHENZHEN ZHUONENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first object of the present invention is to provide a battery negative electrode coating, which aims to solve the technical problem of shortening the cycle life of lithium-ion batteries due to the co-intercalation of electrolyte solvent molecules in existing lithium-ion batteries

Method used

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  • Battery negative electrode coating, battery negative electrode sheet and manufacturing method thereof, and lithium ion battery
  • Battery negative electrode coating, battery negative electrode sheet and manufacturing method thereof, and lithium ion battery

Examples

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Embodiment 1

[0042] Such as Figure 1-2As shown, the negative electrode coating 22 of the battery provided by Embodiment 1 of the present invention includes a negative electrode active material, a negative electrode conductive agent, a suspending agent and a negative electrode binder. The negative electrode active material includes artificial graphite particles and is coated on artificial graphite particles. A layer of hard carbon material outside graphite particles. Artificial graphite using amorphous carbon materials in N 2 Obtained by high temperature graphitization (>2500°C) in the atmosphere. Hard carbon material is pyrolytic carbon formed after thermal decomposition of high molecular polymer, which is difficult to graphitize. It has good electrical conductivity, which is helpful for reducing the internal resistance of lithium-ion batteries and improving cycle performance, and can prevent the solvent molecules of the electrolyte from intercalating. into the graphite structure layer ...

Embodiment 2

[0114] The battery negative electrode coating 22, the battery negative electrode sheet 2, the manufacturing method of the battery negative electrode sheet 2, and the lithium-ion battery provided in this embodiment are mainly different from the first embodiment in that the positive electrode active material is different, and the details are as follows:

[0115] In this embodiment, the positive active material includes the ternary material LiNi x mn y co z o 2 Particles, doped in the ternary material LiNi x mn y co z o 2 The doping elements in the particles and the ternary material LiNi coated in the x mn y co z o 2 The coating layer outside the particle, wherein, 0.5≤x≤0.8, 0.1≤y≤0.3, 0.1≤z≤0.3, x+y+z=1.0;

[0116] The doping element includes at least one of Al and F;

[0117] The cladding layer includes MgO, Al 2 o 3 , ZrO 2 、TiO 2 , AlPO 4 , AlF 3 , LiAlO 2 , LiTiO 2 at least one of the

[0118] The battery anode coating 12 provided in this embodiment adop...

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Abstract

The invention is applicable to the field of lithium ion batteries, and discloses a battery negative electrode coating, a battery negative electrode sheet, a battery negative electrode sheet manufacturing method, and a lithium ion battery. The components of the battery negative electrode coating include a negative electrode active material, a negative electrode conductive agent, a suspending agent,and a negative electrode binder; and the negative active material includes artificial graphite particles and a hard carbon material layer coated on the outside of the artificial graphite particles. According to the invention, since the artificial graphite particles coated with the hard carbon material are used as the negative electrode active material, therefore, the hard carbon material layer can be used for forming a protective layer outside the artificial graphite particles to prevent the solvent molecules of the electrolyte from being embedded in a negative electrode graphite structural layer; and the hard carbon material has the characteristic of good electrical conductivity, which is beneficial to further improve the cycle performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a battery negative electrode coating, a battery negative electrode sheet, a method for manufacturing the battery negative electrode sheet, and a lithium ion battery. Background technique [0002] The negative electrode sheet of a lithium ion battery generally includes a negative electrode metal substrate and a negative electrode coating coated on the outside of the negative electrode metal substrate. The components of the negative electrode coating generally include a negative electrode active material, a negative electrode conductive agent, a suspending agent and a negative electrode binder. [0003] In existing lithium-ion batteries, graphite is generally used as the negative electrode active material. In the specific application of this lithium-ion battery, the solvent molecules of the electrolyte are easily embedded in the graphite crystal structure layer along with the l...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/04H01M4/66C01B32/20
CPCY02E60/10
Inventor 李亮欧瑞先黄国文韦丽娟
Owner SHENZHEN ZHUONENG NEW ENERGY TECH
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