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Negative pole piece, lithium ion battery and manufacturing method of lithium ion battery

A lithium-ion battery and negative pole piece technology, which is applied in battery electrodes, secondary batteries, and final product manufacturing, can solve problems that affect battery cycle life, slow ion migration speed, and low charge-discharge rate, and achieve high rate improvements The effect of discharge capacity, high content of active lithium ions, and high concentration of lithium salts

Active Publication Date: 2020-04-21
SHENZHEN ZHUONENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Anode materials include carbon materials and non-carbon anode materials. Carbon materials include graphite anodes and non-graphite anodes. Among the many anode materials, graphite anodes are the most widely used, but graphite also has shortcomings: for example, graphite’s low Potential, forms an interface film with the electrolyte, and is easy to cause lithium precipitation; the ion migration speed is slow, so the charge and discharge rate is low; the layered graphite will undergo about 10% deformation during the insertion and deintercalation of lithium ions, affecting Battery cycle life

Method used

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  • Negative pole piece, lithium ion battery and manufacturing method of lithium ion battery
  • Negative pole piece, lithium ion battery and manufacturing method of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method for lithium ion battery negative electrode slurry, comprising the following steps:

[0035] 1) Fully mix and grind the carbon powder and metal copper powder at a weight ratio of 99.99:0.01, graphitize at a high temperature of 2900°C, and complete the doping after cooling; among them, the D50 of the metal copper powder is 10mm;

[0036] 2) Mix and pulverize the product doped in step 1) with phenolic resin in a weight ratio of 95:5, heat at 2700°C, complete carbon coating after cooling, and obtain artificial graphite;

[0037] 3) After the artificial graphite is pulverized, it is added to the ethanol solution of conductive carbon black and stirred evenly. After heating, evaporation, drying, pulverization and high temperature heat treatment at 1500°C, the negative electrode active material is obtained after cooling; wherein, artificial graphite powder and conductive carbon The weight ratio of black is 100:0.5.

[0038] 4) Mix the negative electrode ac...

Embodiment 2

[0054] 1) Fully mix and grind carbon powder and metal nickel powder at a weight ratio of 99.80:0.20, graphitize at a high temperature of 3000°C, and complete doping after cooling; among them, the D50 of metal copper powder is 10mm;

[0055] 2) Mix and pulverize the product doped in step 1) with the phenolic resin in a weight ratio of 93:7, heat at 2800° C., complete carbon coating after cooling, and obtain artificial graphite;

[0056] 3) After pulverizing the artificial graphite, add it to the ethanol solution of conductive carbon black and stir evenly. After heating, evaporating, drying, pulverizing and high temperature heat treatment at 1800°C, the negative electrode active material is obtained after cooling; among them, artificial graphite powder and conductive carbon The weight ratio of black is 100:0.2.

[0057] 4) Mix the negative electrode active material, binder, conductive agent and suspending agent obtained in step 3), wherein the negative electrode active material ...

Embodiment 3

[0073] 1) Fully mix and grind the carbon powder and metal silver powder at a weight ratio of 99.70:0.30, graphitize at a high temperature of 3100°C, and complete the doping after cooling; among them, the D50 of the metal copper powder is 10mm;

[0074] 2) Mix and pulverize the doped product in step 1) with phenolic resin in a weight ratio of 96:4, heat at 3000°C, complete carbon coating after cooling, and obtain artificial graphite;

[0075] 3) After the artificial graphite is pulverized, it is added to the ethanol solution of conductive carbon black and stirred evenly. After heating, evaporation, drying, crushing and high temperature heat treatment at 2000°C, the negative electrode active material is obtained after cooling; wherein, artificial graphite powder and conductive carbon The weight ratio of black is 100:3.

[0076] 4) Mix the negative electrode active material, binder, conductive agent and suspending agent obtained in step 3), wherein the negative electrode active m...

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Abstract

The invention discloses a negative pole piece, a lithium ion battery and a manufacturing method of the lithium ion battery. Modified artificial graphite is selected as a negative electrode active substance, the artificial graphite is doped with one or more of Cu, Ni and Ag, the surface of the artificial graphite is coated with amorphous carbon subjected to phenolic resin pyrolysis, and the surfaceof the artificial graphite is further subjected to heat treatment, so that the high-current discharge capacity of the negative active substance, the negative pole piece coated with the negative active substance and the lithium ion battery taking the negative pole piece as a negative pole is effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to a negative pole piece, a lithium-ion battery and a manufacturing method thereof. Background technique [0002] As a green and environmentally friendly new energy, lithium-ion batteries have the advantages of good reliability, high safety, small size, and light weight. At present, they have been widely used in digital products, electric vehicles, military products and other fields. With the country's strong support for new energy, the development of lithium-ion batteries is in full swing, but the requirements for the service life, safety and low cost of lithium-ion batteries are also getting higher and higher. At present, lithium-ion batteries are also moving towards long life, high safety, Development in the direction of high magnification and low cost. [0003] The negative electrode material is the carrier of lithium ions and electrons during the chargi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/133H01M10/0567H01M10/0568H01M10/0587H01M10/0525
CPCH01M4/366H01M4/583H01M4/62H01M4/626H01M4/628H01M4/133H01M10/0568H01M10/0567H01M10/0587H01M10/0525H01M2300/0025Y02E60/10Y02P70/50
Inventor 欧瑞先朱燕飞黄国文黄延新刘耀
Owner SHENZHEN ZHUONENG NEW ENERGY TECH
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