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SIOx-based compound cathode material for lithium ion batteries and preparation method of material

A technology for lithium-ion batteries and negative electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of volume expansion, poor conductivity of silicon oxide particles, and poor cycle performance, so as to reduce irreversible capacity loss, The process conditions are easy to control and the effect of improving conductivity

Inactive Publication Date: 2018-09-04
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The silicon oxide composite negative electrode material has a high initial cycle capacity (1100mAh / g), but quickly decays to about 500mAh / g, and the cycle performance is very poor.
This material simply mixes sintered silicon oxide and conductive carbon mechanically. The surface conductivity of silicon oxide particles is poor, and the problem of volume expansion is not solved.

Method used

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  • SIOx-based compound cathode material for lithium ion batteries and preparation method of material
  • SIOx-based compound cathode material for lithium ion batteries and preparation method of material
  • SIOx-based compound cathode material for lithium ion batteries and preparation method of material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of SiO x The preparation method of the base composite negative electrode material includes the following steps:

[0032] 1) Mix 200g of the silica raw material with a median particle size of 5um and 400g of absolute ethanol uniformly, and then use a nano ball mill for ball milling to a median particle size of 500nm to obtain a slurry;

[0033] 2) Take 6g of aluminum isopropoxide and dissolve it with 30g of absolute ethanol, and add it to the slurry, stir and mix evenly;

[0034] 3) Spray drying the slurry with an inlet temperature of 120°C to obtain powder;

[0035] 4) The powder is roasted in a nitrogen atmosphere, the heating rate is 5°C / min, and the temperature is raised to 1000°C for 6 hours to obtain a primary roasted material;

[0036] 5) Airflow crushing of the primary roasted material, the median particle size after crushing is 2um;

[0037] 6) Stir and mix 100g of the crushed material with 10g of asphalt, 5g of polyvinylpyrrolidone and 150g of absolute ethanol, and...

Embodiment 2

[0048] A kind of SiO x The preparation method of the base composite negative electrode material includes the following steps:

[0049] 1) Mix 200g of silica raw material with a median particle size of 5um and 400g of absolute ethanol uniformly, and then ball mill with a nano ball mill to achieve a median particle size of 800 nm to obtain a slurry;

[0050] 2) Take 8.5 g of magnesium acetate and dissolve it in 30 g of deionized water, and add it to the slurry, stir and mix evenly;

[0051] 3) Spray drying the slurry with an inlet temperature of 120°C to obtain powder;

[0052] 4) The powder is roasted in a nitrogen atmosphere, the heating rate is 5°C / min, and the temperature is raised to 1000°C for 6 hours to obtain the primary roasted material;

[0053] 5) Airflow crushing of the primary roasted material, the median particle size after crushing is 2.5um;

[0054] 6) Stir and mix 100 g of the crushed material with 10 g of asphalt, 20 g of polyethylene glycol and 150 g of absolute ethanol,...

Embodiment 3

[0057] A kind of SiO x The preparation method of base composite negative electrode material includes the following steps:

[0058] 1) Mix 200g of the silica raw material with a median particle size of 3um and 300g of absolute ethanol uniformly, and then use a nano ball mill for ball milling to a median particle size of 500nm to obtain a slurry;

[0059] 2) Take 5.5 g of calcium acetate and dissolve it in 30 g of deionized water, and add it to the slurry, stir and mix evenly;

[0060] 3) Spray drying the slurry with an inlet temperature of 150°C to obtain powder;

[0061] 4) The powder is roasted in a nitrogen atmosphere, the heating rate is 5°C / min, and the temperature is raised to 1000°C for 2 hours to obtain a primary roasted material;

[0062] 5) Airflow crushing of the primary roasted material, the median particle size after crushing is 1um;

[0063] 6) Stir and mix 100 g of the crushed material with 10 g of sucrose, 8 g of polyvinyl alcohol and 150 g of absolute ethanol, and then st...

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Abstract

The invention discloses a SIOx-based compound cathode material for lithium ion batteries and a preparation method of the material. Firstly, silicon oxide raw materials are subjected to ball-milling treatment, uniformly blended with metal salts and then subjected to spray drying, roasting is conducted at an inert atmosphere to trigger high-temperature disproportionation, and the surfaces of particles are coated with a layer of silicate; then, the surfaces of the particles are coated with a layer of amorphous-type conductive carbon to enhance the conductivity, and a finished product of the SIOx-based compound cathode material is obtained at last. The synthetic process is simple, the process conditions are easy to control, and industrialization is easily achieved. The prepared SIOx-based compound cathode material is high in efficacy and great in circulating performance and can serve as a lithium ion power battery cathode material of a new generation.

Description

Technical field [0001] The invention relates to the field of anode materials for lithium ion batteries, in particular to a SiO for lithium ion batteries x Base composite negative electrode material and preparation method thereof. Background technique [0002] The theoretical capacity of graphite anode material is 372mAh / g, which has been unable to meet the high energy density requirements of new lithium-ion batteries. Therefore, the development of new high-capacity lithium-ion battery anode materials is very important. [0003] At present, the main technical way to improve the energy density of batteries at home and abroad is to use high nickel-based cathode materials in combination with high specific capacity silicon carbon anode materials. Silicon has the highest theoretical specific capacity (4200mAh / g) among lithium-ion battery anode materials, and is currently the best choice for high-energy density lithium-ion battery anode materials. However, there is a problem of excessiv...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62
CPCH01M4/48H01M4/625Y02E60/10
Inventor 马倩倩徐宁宋英杰伏萍萍
Owner TIANJIN B&M SCI & TECH
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