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Composite negative electrode material, preparation method thereof and lithium ion battery

A negative electrode material and carbon material technology, applied in the field of electrochemistry, can solve problems such as poor cycle performance and easy damage to the lithium silicate nano-protective layer structure, so as to avoid pulverization and structural damage, improve cycle performance, and avoid structural damage. The effect of destruction

Pending Publication Date: 2022-03-01
BTR NEW MATERIAL GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the lithium silicate nano-protective layer structure is easily destroyed during the cycle process of the above-mentioned lithium battery silicon negative electrode composite material. After the lithium silicate nano protective layer structure is destroyed, the expansion of nano-silicon makes the lithium battery silicon negative electrode composite material pulverized, resulting in cycle performance. bad

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  • Composite negative electrode material, preparation method thereof and lithium ion battery
  • Composite negative electrode material, preparation method thereof and lithium ion battery
  • Composite negative electrode material, preparation method thereof and lithium ion battery

Examples

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preparation example Construction

[0097] For the preparation method of the above-mentioned composite negative electrode material, the process flow chart of the preparation method can be found in Figure 5 , including steps S100-S300.

[0098] Step S100, preparing nano active particles.

[0099] In some embodiments, the preparation method of nano-active particles includes: forming a nano-protective layer on the surface of metal nanoparticles.

[0100] In some embodiments, the method for forming the nano protective layer includes at least one of an oxidation reaction method, a reduction reaction method and a physical coating method.

[0101] In some embodiments, preparing nano active particles specifically includes step S101 or step S102.

[0102] Step S101, performing an oxidation reaction on the surface of the metal nanoparticles to obtain nano active particles.

[0103] Step S102 , performing an oxidation reaction on the surface of the metal nanoparticles to form an oxide layer, and reducing the oxide laye...

Embodiment 1

[0125] Disperse nano-Si with a median particle size of 20 nm in ethylene glycol, stir, and then add 5% H 2 o 2 solution, stirred for 4h to obtain Si@SiO containing oxide layer 2 Nanoparticles, SiO 2 The thickness of the layer is 8nm (wherein, it needs to be explained that Si@SiO 2 Nanoparticles represent Si as the core and SiO as the cladding layer 2 , the following examples and comparative examples represent the same meaning).

[0126] The above Si@SiO 2 Nanoparticles, graphite with a median particle size of 10 μm, polyacrylic acid and binder (including aluminum dihydrogen phosphate) are dispersed in a mixed solvent of water and ethanol, wherein the water: ethanol weight ratio is 10:90, graphite, polyacrylic acid and The weight ratio of the binder is 2:3, stir evenly, and then dry to obtain the precursor.

[0127] Mix the above precursor powder with glucose with a particle size of 5 μm in a mass ratio of 20:80, then mix with VC, the mixing parameters are frequency 25HZ,...

Embodiment 2

[0132] Put nano-Ge particles with a median particle size of 100nm in a heat treatment furnace, pass air into it, heat up to 500 degrees, and keep it for 30 minutes to obtain Ge@GeO with an oxide layer 2 Nanoparticles, GeO 2 The thickness of the layer is 15 nm.

[0133] Put the above Ge@GeO 2Nanoparticles, graphite with a median particle size of 1 μm, polyvinyl chloride, and a binder (the binder includes aluminum dihydrogen phosphate) are dispersed in a mixed solvent of water and ethanol, wherein the weight ratio of water: ethanol is 20:80, graphite The weight ratio of the polyvinyl chloride and the binder is 94:3:3, stir evenly, and then dry to obtain the precursor.

[0134] Mix the above precursor powder and phenolic resin with a particle size of 6 μm in a mass ratio of 20:20, then mix with VC, the mixing parameters are frequency 20HZ, time 70min, and then add it to the fusion machine, adjust the speed to 400rpm, and fuse 0.5h, then placed in a box-type furnace, fed with n...

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Abstract

The invention discloses a composite negative electrode material, a preparation method thereof and a lithium ion battery. The composite negative electrode material comprises nano active particles, a graphite carbon material and a binder, the binder is dispersed on the surfaces of the nano active particles, and the nano active particles comprise metal nano particles and a nano protective layer formed on the surfaces of the metal nano particles. The binder comprises at least one of a phosphate-based adhesive and a conductive silver adhesive. The problems that a silicon negative electrode material in the prior art is poor in expansion and cycle performance and relatively high in absolute value, cannot be applied to some batteries with strict requirements on expansion volume, such as soft package batteries, and cannot meet the requirements of ultra-long cycle and low expansion of a next-generation battery material are solved.

Description

technical field [0001] The invention belongs to the field of electrochemistry and the application field of lithium-ion battery negative electrode materials, and relates to a composite material, a preparation method and a lithium-ion battery containing the composite material. Background technique [0002] With the development of new energy vehicles, the demand for high-energy-density anode materials continues to increase. Among them, silicon anodes are generally considered to be the next-generation battery anode materials, which have the advantages of high capacity, abundant sources, and relative safety. However, the silicon negative electrode has a severe volume expansion effect during the cycle, which leads to the pulverization and fragmentation of the material, and the cycle decay of the battery is very fast. To solve this problem, there are currently multiple solutions, including structural design of silicon, the use of nanometerization, porosity, composite coating, etc.,...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525H01M10/42B82Y30/00
CPCH01M4/362H01M4/366H01M4/621H01M4/624H01M4/38H01M4/583H01M10/0525H01M10/4235B82Y30/00H01M2004/027Y02E60/10
Inventor 肖称茂何鹏任建国贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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