A kind of preparation method of negative electrode composite material of lithium ion battery

A lithium ion battery and composite material technology, which is applied in the field of preparation of lithium ion battery negative electrode composite materials, can solve the problems of insufficient contact between graphite and silicon oxide, and the influence of the discharge capacity of lithium battery negative electrode materials, so as to improve the bonding force and solve the Combination is difficult, the effect of improving the discharge capacity

Active Publication Date: 2022-01-04
NINGBO VEKEN BATTERY
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Problems solved by technology

[0003] Chinese Patent Publication No. CN108899488 discloses a modified carbon-coated silicon oxide composite material, a preparation method and its application. The composite material is prepared by dissolving phenolic resin in ethanol and adding graphene oxide, then adding silicon oxide Silicon powder is heated and stirred until evaporated to dryness, and finally carbonized. In this invention, graphene is first added to the phenolic resin solution, and then silicon oxide powder is added to the phenolic resin solution, and finally evaporated to dryness and carbonized. The disadvantage of the method is that only a small amount of silicon oxide adheres to the surface of graphite during the mixing process of graphene and silicon oxide in the phenolic resin solution, and there is carbonized phenolic resin between graphite and silicon oxide in the composite material, resulting in Graphite and silicon oxide cannot be fully contacted, which affects the discharge capacity of lithium battery anode materials

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  • A kind of preparation method of negative electrode composite material of lithium ion battery

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Embodiment 1

[0022] The preparation method of negative electrode composite material of lithium ion battery comprises the following steps:

[0023] 1) phenolic resin is dissolved in ethanol and is mixed with phenolic resin solution, and the mass volume ratio of phenolic resin and ethanol is 1:13g / mL; Carboxymethyl chitosan is dissolved in water and is mixed with carboxymethyl chitosan that mass concentration is 1wt%. base chitosan solution;

[0024] 2) After mixing graphite and silicon oxide, carry out ball milling to obtain mixed powder a, the mass ratio of silicon oxide and graphite is 5:98; add mixed powder a to the carboxymethyl chitosan solution in the step 1), The mass ratio of the mixed powder a to the carboxymethyl chitosan solution is 1:30, left to stand for 25min, filtered and dried successively to obtain the powder b;

[0025] 3) Add the powder b in the step 2) into the phenolic resin solution, the mass ratio of the powder b to the phenolic resin solution is 1:15, stir and mix e...

Embodiment 2

[0028] The preparation method of negative electrode composite material of lithium ion battery comprises the following steps:

[0029] 1) phenolic resin is dissolved in ethanol and is mixed with phenolic resin solution, and the mass volume ratio of phenolic resin and ethanol is 1:11g / mL; Carboxymethyl chitosan is dissolved in water and is mixed with the carboxymethyl chitosan that mass concentration is 0.5wt%. Methyl chitosan solution;

[0030] 2) After mixing graphite and silicon oxide, carry out ball milling to obtain mixed powder a, the mass ratio of silicon oxide and graphite is 5:96; add mixed powder a to the carboxymethyl chitosan solution in the step 1), The mass ratio of mixed powder a to carboxymethyl chitosan solution is 1:25, left standstill for 22min, filtered and dried successively to obtain powder b;

[0031] 3) Add the powder b in the step 2) into the phenolic resin solution, the mass ratio of the powder b to the phenolic resin solution is 1:12, stir and mix eve...

Embodiment 3

[0034] The preparation method of negative electrode composite material of lithium ion battery comprises the following steps:

[0035] 1) phenolic resin is dissolved in ethanol and is mixed with phenolic resin solution, and the mass volume ratio of phenolic resin and ethanol is 1:14g / mL; Carboxymethyl chitosan is dissolved in water and is mixed with the carboxymethyl chitosan that mass concentration is 1.5wt%. Methyl chitosan solution;

[0036]2) After mixing graphite and silicon oxide, carry out ball milling to obtain mixed powder a, the mass ratio of silicon oxide and graphite is 5:100; add mixed powder a to the carboxymethyl chitosan solution in the step 1), The mass ratio of the mixed powder a to the carboxymethyl chitosan solution is 1:45, left to stand for 25min, filtered and dried successively to obtain the powder b;

[0037] 3) Add the powder b in the step 2) into the phenolic resin solution, the mass ratio of the powder b to the phenolic resin solution is 1:18, stir a...

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Abstract

The invention relates to the technical field of lithium battery electrode materials, and discloses a method for preparing a negative electrode composite material of a lithium ion battery. The method for preparing the negative electrode composite material of a battery is to firstly mix graphite and silicon oxide and then perform ball milling to obtain a mixed powder a, and then The mixed powder a is added into a carboxymethyl chitosan solution, dried, then added into a phenolic resin solution for mixing and stirring, and finally calcined to obtain a battery negative electrode composite material. In the present invention, graphite and silicon oxide are ball-milled, so that a large amount of silicon oxide covers the graphite surface and can fully contact graphite, thereby greatly improving the discharge capacity of the negative electrode material of the lithium battery.

Description

technical field [0001] The invention relates to the technical field of lithium battery electrode materials, in particular to a preparation method of a negative electrode composite material of a lithium ion battery. Background technique [0002] In recent years, with the rapid development of mobile phones, notebook computers, digital cameras, electric tools, etc., especially with the rapid development of the market of hybrid electric vehicles and pure electric vehicles, people are concerned about the capacity, cycle life and Security places higher demands than ever before. At present, the negative electrode active materials of commercial lithium-ion batteries use various graphite-like carbon materials, and their theoretical specific capacity is only 372mAh / g, which is difficult to meet the requirements of high specific energy lithium-ion batteries. Compared with graphite-based anode materials, the discharge capacity of silicon as a lithium-ion battery anode material is as hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/62
CPCY02E60/10
Inventor 赵育松李亚飞林颖方潘美姿
Owner NINGBO VEKEN BATTERY
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