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A method for producing silicon-oxygen negative electrode materials by liquid-phase coating and two-stage calcination

A technology of liquid phase coating and negative electrode materials, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of poor cycle performance, low initial efficiency of silicon oxide, etc., and achieve the effect of low initial efficiency

Active Publication Date: 2022-04-15
夏国举
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The silicon oxide produced by the existing liquid phase coating process or gas phase coating process has the disadvantages of low initial efficiency and poor cycle performance, which cannot fully meet the market's requirements for product performance

Method used

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  • A method for producing silicon-oxygen negative electrode materials by liquid-phase coating and two-stage calcination
  • A method for producing silicon-oxygen negative electrode materials by liquid-phase coating and two-stage calcination

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the method for producing a silicon-oxygen negative electrode material according to the liquid-phase coating and two-stage calcination method described in the embodiment of the present invention includes the following steps:

[0028] S1 While grinding silicon dioxide, add citric acid to grind together. The proportion of citric acid added is 20wt%. Through long-term uniform mixing, several citric acid particles are distributed around each silicon oxide particle;

[0029] S2 When the D50 is ground to 0.1-0.5 μm, add a solvent capable of dissolving citric acid, dissolve the micronized citric acid, and rotate it in a ball mill, and use the grinding medium to break up the adsorbed and agglomerated particles again, so that The covered surface is re-exposed and covered again, the ball-to-material ratio of ball milling is 2:1, and the ball milling time is 3 hours;

[0030] After S3 coating is completed, heat to volatilize the solvent, and citric acid ...

Embodiment 2

[0036] The method for producing a silicon-oxygen negative electrode material according to the liquid-phase coating and two-stage calcination method described in the embodiment of the present invention includes the following steps:

[0037] S1 While grinding silicon dioxide, add glucose to grind together. The proportion of glucose added is 3wt%. Through long-term uniform mixing, several glucose particles are distributed around each silicon oxide particle;

[0038] S2 When the D50 is ground to 0.1-0.5 μm, add a solvent capable of dissolving glucose, dissolve the micronized glucose, and rotate it in a ball mill, and use the grinding medium to break up the adsorbed and agglomerated particles again, so that the uncoated The covered surface is exposed again and covered again, the ball-to-material ratio of ball milling is 1:3, and the ball milling time is 2 hours;

[0039] After the coating of S3 is completed, the solvent is evaporated by heating, and the glucose is evenly coated on ...

Embodiment 3

[0044] The method for producing a silicon-oxygen negative electrode material according to the liquid-phase coating and two-stage calcination method described in the embodiment of the present invention includes the following steps:

[0045] S1 While grinding silicon dioxide, add sucrose to grind together, the proportion of sucrose added is 10wt%, through long-term uniform mixing, several sucrose particles are distributed around each silicon oxide particle;

[0046] S2 Grind until the D50 is 0.1-0.5 μm, add a solvent capable of dissolving sucrose, dissolve the micronized sucrose, and rotate it in a ball mill, use the grinding medium to break up the adsorbed and agglomerated particles again, so that the uncoated The covered surface is re-exposed and covered again, the ball-to-material ratio of ball milling is 1:2, and the ball milling time is 2.5 hours;

[0047] After S3 coating is completed, heat to volatilize the solvent, and sucrose is evenly coated on the surface of silicon o...

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Abstract

The invention discloses a method for producing silicon-oxygen negative electrode materials by liquid phase coating and two-stage calcination. The method is to grind silicon oxide and carbon source materials together, add a solvent capable of dissolving carbon source materials, and grind Rotate in middle, use the ball milling medium to break up the adsorbed and agglomerated particles, so that the uncoated surface is re-exposed and coated again. After the coating is completed, the solvent is volatilized by heating to obtain a precursor. The obtained precursor After the body is heated to 300°C, it is kept warm for 3‑5 hours to achieve the third repairing coating. After the heat preservation, nitrogen gas is introduced to replace the oxidizing atmosphere and harmful impurities generated in the carbon source material, and the calcination is continued. The liquid-phase coating and two-stage calcination method of the present invention for producing silicon-oxygen negative electrode materials improves the coating process and adjusts the calcination heating system at the same time, so as to increase the first effect from 75~76% to >77%, and the cycle from 800 Weeks increased to >1000 weeks.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for producing silicon-oxygen negative electrode materials by liquid-phase coating and two-stage calcination. Background technique [0002] Silicon oxide is recognized as the next-generation material to increase the specific energy density of lithium battery anode materials, so the first-time efficiency and cycle performance of silicon oxide are related to the cost and service life of lithium batteries. The silicon oxide produced by the existing liquid-phase coating process or gas-phase coating process has disadvantages such as low first-time efficiency and poor cycle performance, and cannot fully meet the market's requirements for product performance. The key factors related to the first-time efficiency and cycle performance of silicon oxide are the coating integrity of the carbon source material on the silicon oxide surface and the compactness of the carbo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 高涌夏国举
Owner 夏国举
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