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Preparation method for negative electrode active material of lithium ion battery

A negative electrode active material, lithium ion battery technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problem that the electrochemical performance of silicon negative electrode materials cannot be effectively improved, silicon nanoparticles are easy to agglomerate, and the coating is uneven, etc. problems, to achieve the effect of improving cycle stability, avoiding adhesion, and improving structural stability

Active Publication Date: 2013-12-25
JIANGSU HUADONG INST OF LI ION BATTERY +1
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Problems solved by technology

However, the bonding force between silicon and carbon in the usual coating method is weak. In addition, silicon nanoparticles are easy to agglomerate, and there are still many silicon particles in direct contact after coating. Chemical properties cannot be effectively improved

Method used

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

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preparation example Construction

[0017] see figure 1 , the embodiment of the present invention provides a kind of preparation method of negative electrode active material of lithium ion battery, comprises the following steps:

[0018] S1, providing silicon particles and a silane coupling agent, the silane coupling agent has a hydrolyzable functional group and an organic functional group;

[0019] S2, mixing the silicon particles and a silane coupling agent in water to form a first mixed solution, wherein the hydrolyzable functional groups of the silane coupling agent are hydrolyzed and chemically grafted onto the surface of the silicon particles;

[0020] S3, adding polymer monomers or oligomers to the first mixed solution to form a second mixed solution, and coating a polymer layer on the surface of the silicon particles by in-situ polymerization to form a silicon polymer In a composite material, the polymer monomer or oligomer reacts with the organic functional group of the silane coupling agent while unde...

Embodiment

[0050] 1.2 g of nano-silicon powder was dispersed in 100 ml of ethanol solution, and then 1.5 ml of hydrofluoric acid was added to etch the silicon powder for 2 hours. Then, 50 ml of deionized water and 50 ml of ethanol were added to the ethanol solution dispersed with silicon powder, and the dispersion liquid was formed by ultrasonication in an ultrasonic magnetic crusher for 3 hours. Add 1 ml of vinyltriethoxysilane coupling agent dropwise to the dispersion liquid and continue ultrasonic stirring to form the first mixed liquid. Then this first mixed solution is poured in a three-necked flask, and 1ml nitric acid is added in this first mixed solution to keep this first mixed solution under acidic environment. 5 ml of acrylonitrile monomer and 0.05 g of benzoyl peroxide as an initiator were added to the first mixed liquid to form a second mixed liquid. The second mixed solution was heated under a constant temperature oil bath at 80°C to cause free radical in-situ polymerizati...

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Abstract

The invention relates to a preparation method for a negative electrode active material of a lithium ion battery. The preparation method comprises the following steps: providing a silicon particle and a silane coupling agent which has a hydrolyzable functional group and an organic functional group; mixing the silicon particle with the silane coupling agent in water to form a first mixed liquor, wherein the hydrolyzable functional group of the silane coupling agent is hydrolyzed and chemically grafted onto the surface of the silicon particle; adding a polymer monomer or oligomer into the first mixed liquor to form a second mixed liquor, coating a polymer layer on the surface of the silicon particle by using in situ polymerization so as to form a silicon / polymer composite and allowing the polymer monomer or oligomer to react with the organic functional group of the silane coupling agent during polymerization so as to allow the generated polymer layer to be chemically grafted onto the surface of the silicon particle; and subjecting the silicon / polymer composite to heat treatment to carbonize the polymer layer so as to form a carbon layer coated on the surface of the silicon particle, thereby forming a silicon carbon composite.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion negative electrode active material, in particular to a preparation method of a silicon carbon composite material used as a lithium ion battery negative electrode active material. Background technique [0002] The current commercial anode material is mainly graphite, which has a low theoretical specific capacity (372 mAh g -1 ), high-rate charge-discharge performance and other shortcomings can no longer fully meet the needs of the development of lithium-ion batteries. The development of high-energy lithium-ion batteries urgently needs to seek high-capacity, long-life, safe and reliable new high-capacity negative electrodes to replace graphite carbon negative electrode. [0003] Silicon anode material has high theoretical specific capacity and low lithium extraction potential, so it is a very promising high-capacity anode material. The reversible insertion of lithium in silicon can reach 40...

Claims

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Application Information

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IPC IPC(8): H01M4/583
CPCH01M4/0471H01M4/134H01M4/1395H01M4/366H01M4/386H01M4/625H01M10/0525Y02E60/10H01M4/587
Inventor 崔清伟李建军何向明曹江王莉戴仲葭
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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