Silicon-containing powder for lithium ion battery negative electrode material and preparation method of silicon-containing powder

A technology for lithium-ion batteries and negative electrode materials, which is applied in the field of silicon-containing powders for lithium-ion battery negative electrode materials and its preparation, can solve problems affecting the first-time efficiency and cycle performance of batteries, and reduce the risk of spontaneous combustion, stabilize the powder structure, Reduces the effect of absolute volume expansion

Pending Publication Date: 2020-10-09
MAANSHAN KEDA PURUI ENERGY TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although silicon-carbon materials have many advantages when used as negative electrode materials for batteries, silicon-carbon materials inevitably have a certain volume expansion effect during charge and discharge, which affects the first-time efficiency and cycle performance of the battery.

Method used

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  • Silicon-containing powder for lithium ion battery negative electrode material and preparation method of silicon-containing powder
  • Silicon-containing powder for lithium ion battery negative electrode material and preparation method of silicon-containing powder
  • Silicon-containing powder for lithium ion battery negative electrode material and preparation method of silicon-containing powder

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Experimental program
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Effect test

Embodiment 1

[0031] A preparation method of a lithium-ion battery negative electrode material containing silicon powder, comprising the steps of:

[0032] (1) Preparation of silicon-containing powder: Add 1000 g of silicon powder with a median particle size of 1 μm in the mixing tank supporting the sand mill, and the purity of the silicon powder is 99.92%, then add methanol in the mixing tank, and control the mixing tank. The solid content of the mixed solution is 10%, and the slow stirring is turned on, and 0.3mm zirconia beads are filled in the sand mill, and the mass ratio of zirconia beads to silicon powder is controlled to be 15:1, and the host speed of the sand mill is 1000rpm, grinding for 60h, the obtained silicon slurry was heated and dried to obtain a silicon-containing powder. Through detection, the median particle size D50 of the silicon-containing powder was 56nm, and the grain size of silicon was 7.9nm. The silicon powder contains 65.6 wt.% silicon, 26.3 wt.% oxygen and 8.1 w...

Embodiment 2

[0035] A preparation method of a lithium-ion battery negative electrode material containing silicon powder, comprising the steps of:

[0036] (1) Preparation of silicon-containing powder: Add 1000 g of silicon powder with a median particle size of 50 μm in the mixing tank supporting the sand mill, and the purity of the silicon powder is 99.53%, then add propanol in the mixing tank, and control the mixing tank The solid content of the mixed solution in the mixture is 15%, and the slow stirring is started, and 0.05mm zirconia beads are filled in the sand mill, and the mass ratio of the zirconia beads to the silicon powder is controlled to be 18:1, and the main machine speed of the sand mill is 18:1. Grind at 950rpm for 35h to obtain silicon slurry, and then heat and dry the silicon slurry to obtain a silicon-containing powder. The median particle size D50 of the silicon-containing powder is 71nm, and the grain size of silicon is 8.5nm. The silicon-containing powder Contains 74.4...

Embodiment 3

[0039] A preparation method of a lithium-ion battery negative electrode material containing silicon powder, comprising the steps of:

[0040] (1) Preparation of silicon-containing powder: Add 1000 g of silicon powder with a median particle size of 500 μm in the mixing tank supporting the sand mill, and the purity of the silicon powder is 99.67%, then add butanol in the mixing tank, and control the mixing tank The solid content of the mixed solution in the mixture is 10%, start slow stirring, fill the sand mill with 0.2mm zirconia beads, control the mass ratio of zirconia beads to silicon powder to 20:1, and the host speed of the sand mill Grinding at 900rpm for 50h, the obtained silicon slurry was heated and dried to obtain a silicon-containing powder. The median particle size D50 of the silicon-containing powder was 86nm, and the grain size of silicon was 10.3nm. The silicon-containing powder Contains 57.6wt.% of silicon, 24.1wt.% of oxygen and 18.3wt.% of zirconium;

[0041...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to silicon-containing powder for a lithium ion battery negative electrode material and a preparation method of the silicon-containing powder. The silicon-containing powder contains 50 to 90 weight percent of silicon, 5 to 30 weight percent of oxygen and 5 to 20 weight percent of zirconium, and the median particle size D50 of the silicon-containing powder is 110nm or less; the silicon-containing powder is analyzed through an X-ray diffraction pattern. According to a half-peak width value of a diffraction peak belonging to Si(111) near 2[theta]=28.4 degrees, and the grain size of silicon calculated by a Scherrer formula is 12nm or less. Compared with the prior art, when the silicon-containing powder prepared by the invention is used in a negative electrode material, high specific capacity and excellent cycle performance can be provided.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a silicon-containing powder for negative electrode materials of lithium ion batteries and a preparation method thereof. Background technique [0002] At present, the conventional lithium ion negative electrode material is mainly graphite negative electrode, but the theoretical specific capacity of graphite negative electrode is only 372mAh / g, which cannot meet the urgent needs of users. The theoretical capacity of silicon is as high as 4200mAh / g, which is more than 10 times the capacity of graphite anode materials. At the same time, the coulombic efficiency of silicon-carbon composites is also close to that of graphite anodes. It is cheap, environmentally friendly, and has abundant earth reserves. It is a new generation of high-capacity The best choice for negative electrode materials. However, due to the poor conductivity of the silicon material itself...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M4/628H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 胡亮张少波方伟曹德福夏永生
Owner MAANSHAN KEDA PURUI ENERGY TECH CO LTD
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