Preparation method of lithium ion battery negative electrode material

A technology for lithium-ion batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, lithium batteries, etc., can solve problems such as capacity decay, volume expansion, and poor cycle stability, and achieve the effect of preventing sudden drop in capacity and preventing shedding

Inactive Publication Date: 2020-12-01
HANGZHOU XINKANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Graphite materials are the most widely used in lithium-ion batteries, and have the advantages of stable cycle performance, but there are disadvantages such as low initial Coulombic efficiency, material peeling and falling off during use, resulting in capacity decay and poor low temperature resistance.
Tin-based materials mainly include silicon, silicon oxides, carbon-silicon composite materials, and silicon alloys. They are negative electrode materials with the highest specific capacity so far, but they are prone to serious volume expansion, structural collapse, material differentiation, and cycle stability. Poor and other issues

Method used

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  • Preparation method of lithium ion battery negative electrode material
  • Preparation method of lithium ion battery negative electrode material
  • Preparation method of lithium ion battery negative electrode material

Examples

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Effect test

Embodiment 1

[0025] A preparation method for a negative electrode material of a lithium ion battery, specifically comprising the following steps:

[0026] S1: Add graphene oxide into DMAc solvent, stir well, then add 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane monomer and 3,3,4,4 -Biphenyltetracarboxylic dianhydride, stirred and reacted at -3°C for 10h to obtain a polyamic acid / graphene oxide mixture (PAA / GO), in which 2,2-bis[4-(4-aminophenoxy ) phenyl]hexafluoropropane monomer and the mass ratio of 3,3,4,4-biphenyltetracarboxylic dianhydride is 1:1.

[0027] S2: Dissolve acetic anhydride and triethylamine in DMAc solvent, wherein the mass ratio of acetic anhydride and triethylamine is 1:1, then slowly add the PAA / GO mixed solution in step S1, speed up the stirring speed, at 65°C Under reaction for 8h, the concentrated solution was obtained.

[0028] S3: put the concentrated solution obtained in step S2 into a tube furnace under a nitrogen atmosphere, bake at 150°C for 30min, the...

Embodiment 2

[0032] A preparation method for a negative electrode material of a lithium ion battery, specifically comprising the following steps:

[0033] S1: Add graphene oxide into DMAc solvent, stir well, then add 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane monomer and 3,3,4,4 -Biphenyltetracarboxylic dianhydride, stirred and reacted at 0°C for 14h to obtain a polyamic acid / graphene oxide mixture (PAA / GO), in which 2,2-bis[4-(4-aminophenoxy) The mass ratio of phenyl]hexafluoropropane monomer to 3,3,4,4-biphenyltetracarboxylic dianhydride is 1:1.

[0034] S2: Dissolve acetic anhydride and triethylamine in DMAc solvent, wherein the mass ratio of acetic anhydride and triethylamine is 1:1, then slowly add the mixed solution of PAA / GO in step S1, speed up the stirring, at 100°C The reaction was carried out for 10h to obtain a concentrated solution.

[0035] S3: put the concentrated solution obtained in step S2 into a tube furnace under a nitrogen atmosphere, burn at 250°C for 30min,...

Embodiment 3

[0039] A preparation method for a negative electrode material of a lithium ion battery, specifically comprising the following steps:

[0040] S1: Add graphene oxide into DMAc solvent, stir well, then add 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane monomer and 3,3,4,4 -Biphenyltetracarboxylic dianhydride, stirred and reacted at -2°C for 11h to obtain a polyamic acid / graphene oxide mixture (PAA / GO), in which 2,2-bis[4-(4-aminophenoxy ) phenyl]hexafluoropropane monomer and the mass ratio of 3,3,4,4-biphenyltetracarboxylic dianhydride is 1:1.

[0041] S2: Dissolve acetic anhydride and triethylamine in DMAc solvent, wherein the mass ratio of acetic anhydride and triethylamine is 1:1, then slowly add the PAA / GO mixed solution in step S1, speed up the stirring speed, at 70°C The reaction was carried out for 8-10 hours to obtain a concentrated solution.

[0042] S3: put the concentrated solution obtained in step S2 into a tube furnace under a nitrogen atmosphere, burn at 200°...

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Abstract

The invention aims to provide a preparation method of a lithium ion battery negative electrode material. According to the technical scheme, the method comprises the following steps: mixing proper amount of 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane, 3,3,4,4-biphenyl tetracarboxylic dianhydride and graphene oxide to prepare PAA / GO, further adding acetic anhydride and triethylamine to prepare a concentrated solution, carrying out high-temperature sintering to obtain a PI-rGO composite material, then adding a proper amount of N-methyl pyrrolidone, polyimide, polyvinylidene fluoride, nanosilicon particles, carbon nanotubes and beta-cyclodextrin to obtain conductive slurry, further drying and cooling, and slicing on a manual slicing machine to obtain the required lithium ion battery negative electrode material. In the use process of the negative electrode material, the probability of side reaction is low, silicon particles attached to the surface of the negative electrode materialare not prone to falling off in the charging and discharging process, sudden reduction of capacity is prevented, and the negative electrode material has good lithium ion conduction performance.

Description

technical field [0001] The invention belongs to the field of lithium ion battery material preparation, and in particular relates to a preparation method of lithium ion battery negative electrode material. Background technique [0002] The first research on lithium batteries can be traced back to the 1950s, and it entered practical use in the 1970s. It uses metal lithium as the negative electrode, a solid material capable of intercalating and extracting lithium ions as the positive electrode, and salts or solid salts soluble in organic solvents as the electrolyte. However, during the charging and discharging process of a lithium battery, metal lithium will deposit on the negative electrode to form lithium dendrites, which will penetrate the separator and cause a short circuit, which is prone to explosion. In order to overcome this shortcoming and improve the safety of batteries, lithium-ion batteries were born. In 1991, Sony Corporation of Japan announced the birth of the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/04H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/386H01M4/625H01M4/04H01M10/0525B82Y30/00B82Y40/00Y02E60/10H01M4/134H01M4/1395H01M4/623H01M2004/021H01M4/0404H01M4/622H01M4/624H01M4/661H01M10/052H01M2004/027
Inventor 温华辉
Owner HANGZHOU XINKANG NEW MATERIAL CO LTD
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