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Preparation method of negative electrode material, negative electrode material and application of negative electrode material

A technology of negative electrode material and silicon negative electrode, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of volume expansion hindering the application and promotion of silicon negative electrode materials, reducing cycle life, volume expansion, etc., achieving good uniformity and improving Electrical conductivity, the effect of suppressing volume expansion

Pending Publication Date: 2021-10-26
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest challenge facing the silicon negative electrode is the volume expansion during the process of lithium intercalation and deintercalation.
The huge volume expansion leads to rapid capacity fading, which greatly reduces the cycle life during cycling
The huge volume expansion also hinders the application and promotion of silicon anode materials in 3C consumer batteries

Method used

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  • Preparation method of negative electrode material, negative electrode material and application of negative electrode material
  • Preparation method of negative electrode material, negative electrode material and application of negative electrode material
  • Preparation method of negative electrode material, negative electrode material and application of negative electrode material

Examples

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Effect test

Embodiment 1

[0035] A preparation method of negative electrode material, comprising the following steps:

[0036] S1. Preparation of silicon negative electrode precursor material: Take 11mL tetraethyl orthosilicate and add dropwise to 10mL 0.02mol / L sodium hydroxide alkaline solution, stir at room temperature for 30min, and then transfer to the liner lined with polytetrafluoroethylene At the same time, the reactor was placed in a blast drying oven, kept at 70°C for 5h, cooled to room temperature naturally, and the obtained white precipitate was washed with ethanol and deionized water until the pH of the supernatant was neutral. properties, and then centrifuged at 1500r / min, the obtained white precipitate was vacuum-baked in an oven at 80°C for 12h to obtain a silicon negative electrode precursor material.

[0037] S2. Preparation of silicon negative electrode material: disperse the silicon negative electrode precursor material obtained in step S1 in 5 mL of 10 mM FeCl 3 ·6H 2 Add 5mL of ...

Embodiment 2

[0041] A preparation method of negative electrode material, comprising the following steps:

[0042] S1. Preparation of silicon negative electrode precursor material: Take 11mL tetraethyl orthosilicate and add dropwise to 10mL 0.02mol / L sodium hydroxide alkaline solution, stir at room temperature for 30min, and then transfer to the liner lined with polytetrafluoroethylene At the same time, the reactor was placed in a blast drying oven, kept at 70°C for 5h, cooled to room temperature naturally, and the obtained white precipitate was washed with ethanol and deionized water until the pH of the supernatant was neutral. properties, and then centrifuged at 1500r / min, the obtained white precipitate was vacuum-baked in an oven at 80°C for 12h to obtain a silicon negative electrode precursor material.

[0043] S2. Preparation of silicon negative electrode material: disperse the silicon negative electrode precursor material obtained in step S1 in 5 mL of 10 mM FeCl 3 ·6H 2 Add 5mL of ...

Embodiment 3

[0048] The difference from Example 1 is the preparation of the silicon negative electrode material in step S2.

[0049] Preparation of silicon negative electrode material: disperse the silicon negative electrode precursor material obtained in step S1 in 5mL of 10mM FeCl 3 ·6H 2 Add 5mL of 10mM ethanol solution of isophthalic acid dropwise to the ethanol solution of O, and stir the mixed solution at 50°C for 5h; Roasting in a nitrogen tube furnace, the calcination temperature is 500° C., and the constant temperature time is 1 h, to obtain a porous carbon-coated silicon negative electrode material.

[0050] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention provides a preparation method of a negative electrode material. The preparation method comprises the following steps: S1, preparing a silicon negative electrode precursor material by adopting a solvothermal method; S2, dispersing the silicon negative electrode precursor material obtained in the step S1 into a solution of a metal organic framework compound (MOFs), mixing, stirring for reaction, and drying to obtain a silicon negative electrode material; and S3, carbonizing the silicon negative electrode material obtained in the step S2 to complete the preparation of the negative electrode material. Compared with the prior art, the preparation method disclosed by the invention has the advantages that a silicon negative electrode precursor material with small size and small expansion volume is prepared by adopting a solvothermal method, then the silicon negative electrode precursor material is dispersed into a metal organic framework compound (MOFs) solution, the MOFs framework can well inhibit volume expansion of a silicon negative electrode, and then carbonization is performed to obtain the porous carbon-coated silicon negative electrode material. Therefore, the negative electrode material obtained by the preparation method disclosed by the invention can effectively relieve the problem of volume expansion of a silicon negative electrode in a lithium ion de-intercalation process of the negative electrode material.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for preparing a negative electrode material, the negative electrode material and applications thereof. Background technique [0002] The specific capacity of the existing lithium-ion battery anode material - graphite, is close to the theoretical value, and there is limited room for improvement of the specific capacity. With the advancement of science and technology and the improvement of living standards, the demand for higher energy density in modern society is more urgent. In order to increase the energy density of the battery, it is necessary to use anode materials with higher specific capacity and better performance. [0003] The silicon anode material is widely concerned by practitioners due to its high theoretical specific capacity (close to 4200mAh / g), and it is the anode material most likely to increase the energy density of the battery. In addition, silicon is...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 蓝利芳刘鹤杨超谭远高马斌邓豪陈杰杨山
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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