High-gram-capacity lithium ion battery silicon-carbon negative electrode material, and preparation method and lithium battery thereof

A lithium-ion battery and negative electrode material technology, applied in the direction of battery electrodes, carbon preparation/purification, negative electrodes, etc., can solve the problems of low first efficiency, poor cycle performance, etc., achieve high gram capacity, improve performance, and high first cycle efficiency effect

Pending Publication Date: 2020-03-13
溧阳紫宸新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • High-gram-capacity lithium ion battery silicon-carbon negative electrode material, and preparation method and lithium battery thereof
  • High-gram-capacity lithium ion battery silicon-carbon negative electrode material, and preparation method and lithium battery thereof
  • High-gram-capacity lithium ion battery silicon-carbon negative electrode material, and preparation method and lithium battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment provides a method for preparing a silicon-carbon negative electrode material for a lithium-ion battery with a high gram capacity, which specifically includes the following steps:

[0046] A: Add 0.5g of asphalt to 3g of tetrahydrofuran and mix;

[0047] B: Weigh 10g of nano-silicon with a median particle size of 100nm

[0048] C: Add the mixed solution obtained in step A and the nano-silicon in step B into the ball mill tank;

[0049] D: Add 0.1 g of PVP to the mixture obtained in step C, and ball mill the mixture for 6 hours;

[0050] 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;

[0051] F: The mixture obtained in step E is crushed and passed through a 300-mesh sieve;

[0052] G: Put the mixture obtained in step F in a box-type carbonization furnace, use nitrogen as a protective gas, flow rate is 80L / h, start to heat up after 2.5 hours of nitrogen gas, raise t...

Embodiment 2

[0058] This embodiment provides a method for preparing a silicon-carbon negative electrode material for a lithium-ion battery with a high gram capacity, which specifically includes the following steps:

[0059] A: Add 0.5g of asphalt to 3g of tetrahydrofuran and mix;

[0060] B: take 10g of nano-silicon whose median particle diameter is 50nm;

[0061] C: Add the mixed solution obtained in step A and the nano-silicon in step B into the ball mill tank;

[0062] D: Add 0.1 g of PVP to the mixture obtained in step C, and ball mill the mixture for 6 hours;

[0063] 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;

[0064] F: The mixture obtained in step E is crushed and passed through a 300-mesh sieve;

[0065] G: Put the mixture obtained in step F in a box-type carbonization furnace, use nitrogen as a protective gas, flow rate is 80L / h, start to heat up after 2.5 hours of nitrogen g...

Embodiment 3

[0068] This embodiment provides a method for preparing a silicon-carbon negative electrode material for a lithium-ion battery with a high gram capacity, which specifically includes the following steps:

[0069] A: Add 1g of asphalt to 3g of tetrahydrofuran and mix;

[0070] B: Weigh 10g of nano-silicon with a median particle size of 100nm

[0071] C: Add the mixed solution obtained in step A and the nano-silicon in step B into the ball mill tank;

[0072] D: Add 0.1 g of PVP to the mixture obtained in step C, and ball mill the mixture for 6 hours

[0073] 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;

[0074] F: The mixture obtained in step E is crushed and passed through a 300-mesh sieve;

[0075] G: Put the mixture obtained in step F in a box-type carbonization furnace, use nitrogen as a protective gas, flow rate is 80L / h, start to heat up after 2.5 hours of nitrogen gas, raise the ...

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Abstract

The embodiment of the invention relates to a high-gram-capacity lithium ion battery silicon-carbon negative electrode material, and a preparation method and a lithium battery thereof. The preparationmethod comprises the following steps: asphalt and tetrahydrofuran are stirred and mixed in a container according to a mass ratio of 1:6 to 1:2 to form an asphalt mixed solution; nano-silicon with therequired mass is weighed according to a mass ratio of the nano-silicon to the asphalt mixed solution of 7:20 to 9:20, and the nano-silicon and the asphalt mixed solution are added into a ball millingtank; polyvinylpyrrolidone (PVP) accounting for 1-10% of the mass of the nano-silicon is added into the ball milling tank, and mixing and ball-milling are carried out for 6-8 h to obtain a first mixture; the first mixture is placed in an oven and is dried for 10-12 h to obtain a second mixture; the second mixture is crushed and sieved; the sieved substance is placed in a box-type carbonization furnace, and nitrogen is introduced at a flow rate of 40-80 L/h; and the temperature is raised 2.5-5 h after nitrogen introduction, and reaches 900-1000 DEG C 3-6 h later, the temperature is kept at 900-1000 DEG C for 4-6 h to crack the asphalt, and the cracked asphalt is naturally cooled to obtain the lithium ion battery silicon-carbon negative electrode material.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a high-capacity lithium-ion battery silicon-carbon negative electrode material, a preparation method 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 performance and low first effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B33/02H01M4/36H01M4/38H01M4/62H01M10/0525
CPCC01B33/02C01B32/05H01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 袁树兵冯苏宁刘芳李辉顾华清李婷毕文君李小雪
Owner 溧阳紫宸新材料科技有限公司
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