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A kind of negative electrode material of lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, which is applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of insignificant improvement of cycle performance, unfavorable coating layer, and large energy consumption, so as to improve electrochemical performance. performance, improved Coulombic efficiency, and the effect of high conductivity

Active Publication Date: 2022-01-18
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, two high-temperature sinterings are carried out in the preparation process, which consumes a lot of energy and costs. At the same time, the outer carbon coating method of the sol-gel method is not conducive to the formation of a uniform coating layer, and the improvement of cycle performance is not obvious.

Method used

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

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preparation example Construction

[0030] A preparation method of lithium ion battery negative electrode material, it comprises the following steps:

[0031] S1, the SiO x Materials, solvents, metal compounds, and carbon sources are mixed uniformly and mechanically crushed by planetary ball milling, high-energy ball milling, or sand milling until the median particle size of SiOx is 0.1-3um to obtain a slurry; among them, SiO x Material is SiO x Particles, or a mixture of Si and SiO, and 0.5≤x≤1.5;

[0032] S2. Spray-dry the slurry to obtain a powder with a median particle size of 5-20um; place the powder in the cavity of a fluidized bed reactor, and inject heated fluidizing gas air or nitrogen to make the powder in the suspended state;

[0033] S3. Spray the solution containing the organic carbon source into the cavity of the fluidized bed reactor, and cool down after the solution containing the organic carbon source is completely reacted to obtain the powder containing the coating layer;

[0034] S4. Heat ...

Embodiment 1

[0039] A preparation method of lithium ion battery negative electrode material, it comprises the following steps:

[0040]S1. Mix SiO particles, deionized water, magnesium oxide, carbon nanotubes, and polyvinylpyrrolidone evenly, and crush them by planetary ball mills to SiO slurry with a median particle size of 0.1-3um; where the mass ratio of deionized water to SiO is 1:1, the mass ratio of magnesium oxide to SiO is 1:2, the mass ratio of carbon nanotubes to SiO is 0.1:1, and the mass ratio of polyvinylpyrrolidone to SiO is 0.4:1;

[0041] S2, the slurry is spray-dried to obtain a powder with a median particle size of 5um; the powder is placed in the cavity of a fluidized bed reactor, and heated and fluidized nitrogen is introduced to make the powder in a suspended state;

[0042] S3. Spray the ethanol solution of phenolic resin into the cavity of the fluidized bed reactor, control the injection speed of the solution to finish spraying in 1 hour, and after the temperature of...

Embodiment 2

[0045] A preparation method of lithium ion battery negative electrode material, it comprises the following steps:

[0046] S1. Mix Si particles and SiO particles, isopropanol, aluminum chloride, graphene and sodium carboxymethyl cellulose evenly, and sand and crush them to a slurry with a median particle size of 0.1um; wherein, Si and SiO The mass ratio is 1:1, the mass ratio of isopropanol to Si-containing material is 5:1, the mass ratio of aluminum element to Si-containing material in alumina is 1:12, and the mass ratio of graphene to Si-containing material The mass ratio of sodium carboxymethyl cellulose to Si-containing material is 0.04:1;

[0047] S2. The slurry is spray-dried to obtain a powder with a median particle size of 20um; the powder is placed in a fluidized bed reactor cavity, and heated and fluidized air is introduced to make the powder in a suspended state;

[0048] S3. Spray the deionized aqueous solution of glucose into the cavity of the fluidized bed react...

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Abstract

The invention discloses a lithium ion battery negative electrode material and a preparation method thereof, belonging to the technical field of lithium ion batteries. The lithium-ion battery negative electrode material has a three-dimensional carbon material conductive network inside and a uniform carbon material coating on the outside, and SiO x The nanoparticles are uniformly dispersed in the three-dimensional carbon material conductive network. It is achieved by adding SiO x Materials, solvents, metal compounds, and carbon sources are mixed uniformly and mechanically crushed to obtain a slurry, and the slurry is spray-dried to obtain a powder containing a coating layer through a fluidized bed coating process, and finally treated in an inert atmosphere. It is obtained by sintering at high temperature. The lithium ion battery negative electrode material of the invention has the advantages of high electrical conductivity, long cycle life and high first effect, and its preparation method has the advantages of simple operation, high repeatability, easy industrialization and the like.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] The theoretical capacity of graphite anode material is 372mAh / g, which cannot meet the high energy density requirements of new lithium-ion batteries. Although silicon has the highest theoretical specific capacity of 4200mAh / g, there is a problem of excessive volume expansion (≥300%) in the process of lithium intercalation of silicon materials, which leads to serious cycle attenuation. Silicon oxide also has a higher theoretical specific capacity, but compared with pure silicon, there are Si-O bonds with higher bond energy in the silicon oxide structure and Li 2 O and Li 4 SiO 4 The inactive phase can well inhibit and buffer the volume expansion of the material, so the cycle performance is more advantageous. However, the formation of the inactive phas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/364H01M4/485H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 王胜彬张超张臻
Owner BEIJING WELION NEW ENERGY TECH CO LTD