Lithium battery silicon-carbon negative electrode material, negative electrode material and lithium battery

A negative electrode material, lithium battery technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problems of poor cycle performance and low first effect, achieve high gram capacity and improve performance , the effect of high first-week efficiency

Pending Publication Date: 2020-01-24
溧阳紫宸新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon is accompanied by a huge volume change in the process of lithium intercalation and deintercalation, and a thick SEI film will be formed during the lithium intercalation process, which will cause its disadvantages such as poor cycle performance and low first effect.

Method used

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  • Lithium battery silicon-carbon negative electrode material, negative electrode material and lithium battery
  • Lithium battery silicon-carbon negative electrode material, negative electrode material and lithium battery
  • Lithium battery silicon-carbon negative electrode material, negative electrode material and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] This embodiment provides a method for preparing a silicon-carbon negative electrode material for a lithium-ion battery, which specifically includes the following steps:

[0045] A: Weigh 5g of nano-silicon with a median particle size of 100nm, place 10g of artificial graphite in a 500mL beaker, stir and mix for 10min, and place the mixture in a ball mill tank for 2 hours at a speed of 300r / min;

[0046] B: Add 1.5g of asphalt to 25g of tetrahydrofuran and mix;

[0047] C: Add the mixed solution obtained in step B to the ball mill tank in step A;

[0048] D: Add 0.05 g of CMC to the mixture obtained in step C, and ball mill the mixture for 3 hours;

[0049] E: Dry the mixture in step D in an oven with a temperature of 80°C for 12 hours, and dry until all the organic solvents are volatilized;

[0050] F: The mixture obtained in step E is crushed and passed through a 300-mesh sieve;

[0051] G: Put the mixture obtained in step F in a box-type carbonization furnace, use ...

Embodiment 2

[0057] This embodiment provides a method for preparing a silicon-carbon negative electrode material for a lithium-ion battery, which specifically includes the following steps:

[0058] A: Weigh 5g of nano-silicon with a median particle size of 100nm, place 10g of natural graphite in a 500mL beaker, stir and mix for 10min, and place the mixture in a ball mill jar for ball milling for 2 hours at a speed of 300r / min;

[0059] B: Add 1.5g asphalt to 25g tetrahydrofuran and mix;

[0060] C: Add the mixed solution obtained in step B to the ball mill tank in step A;

[0061] D: Add 0.05 g of CMC to the mixture obtained in step C, and ball mill the mixture for 3 hours;

[0062] E: Dry the mixture obtained in step D in an oven at a temperature of 70°C for 12 hours, and dry until all the organic solvents are volatilized;

[0063] F: The mixture obtained in step E is crushed and passed through a 300-mesh sieve;

[0064] G: Put the mixture obtained in step F in a box-type carbonization...

Embodiment 3

[0067] This embodiment provides a method for preparing a silicon-carbon negative electrode material for a lithium-ion battery, which specifically includes the following steps:

[0068] A: Weigh 5g of nano-silicon with a median particle size of 30nm, place 10g of artificial graphite in a 500mL beaker, stir and mix for 10min, and place the mixture in a ball mill jar and ball mill for 2 hours at a speed of 300r / min;

[0069] B: Add 1.5g of asphalt to 25g of tetrahydrofuran and mix;

[0070] C: Add the mixed solution obtained in step B to the ball mill tank in step A;

[0071] D: Add 0.05 g of CMC to the mixture obtained in step C, and ball mill the mixture for 3 hours;

[0072] E: Dry the mixture obtained in step D in an oven with a temperature of 80° C. for 12 hours, and dry until all the organic solvents are volatilized;

[0073] F: The mixture obtained in step E is crushed and passed through a 300-mesh sieve;

[0074] G: Put the mixture obtained in step F in a box-type carb...

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Abstract

The embodiments of the invention relate to a method for preparing a lithium battery silicon-carbon negative electrode material, a negative electrode material and a lithium battery. The method comprises: mixing nanometer silicon and graphite with a median particle size of 3-15 [mu]m according to a certain mass ratio, and carrying out ball milling for 1-3 h; mixing asphalt and tetrahydrofuran according to a mass ratio of 3:50-3:40 to form an asphalt mixed solution, and adding the asphalt mixed solution into a ball milling tank, and carrying out ball milling to form a first mixture, wherein a mass ratio of the asphalt mixed solution to the silicon to the graphite is 20:5:10-40:10:30; adding carboxymethyl cellulose CMC accounting for 1-5% of the mass of the silicon, and carrying out mixed ballmilling for 3-5 h to obtain a second mixture; drying in a drying oven for 8-12 h to completely volatilize the organic solvent in the second mixture, and then crushing and sieving; and putting the sieved substance into a box-type carbonization furnace, introducing nitrogen at a flow rate of 50-80 L/h, heating after 2.5-5 h, and keeping the temperature at 900-1000 DEG C for 2-4 h after heating for4-6 h; and naturally cooling to obtain the lithium battery silicon-carbon negative electrode material.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a method for preparing a silicon-carbon negative electrode material for a lithium battery, the negative electrode material and a lithium battery. Background technique [0002] With the rapid promotion of lithium-ion batteries in the fields of electric vehicles and energy storage, the requirements for high power density and high energy density have become increasingly prominent. [0003] The current commercial anode material is mainly graphite, which has a low theoretical capacity (372mAh / g), which is higher than that of silicon (4200mAh / g), and has the advantages of good safety performance and low discharge voltage. However, silicon is accompanied by a huge volume change in the process of lithium intercalation and deintercalation, and a thick SEI film will be formed during the lithium intercalation process, which will cause its disadvantages such as poor cycle performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B33/021H01M4/62H01M10/0525B82Y30/00
CPCC01B32/05C01B33/021H01M4/625H01M10/0525B82Y30/00C01P2002/72C01P2004/03Y02E60/10
Inventor 袁树兵冯苏宁刘芳李辉卢勇顾华清周勇岐李婷毕文君
Owner 溧阳紫宸新材料科技有限公司
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