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Composite negative electrode material for lithium ion battery, and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in the field of lithium-ion batteries, can solve the problems of low specific capacity, large-rate continuous charge and discharge capability, and difficulty in effectively improving low-temperature performance, and achieve high specific capacity, excellent kinetic performance, excellent The effect of electrochemical performance

Inactive Publication Date: 2021-06-15
赣州立探新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries are widely used in the fields of 3C consumer, power and energy storage batteries due to their good stability, high energy density and no memory effect. At present, the commercial lithium-ion battery composite negative electrode materials are mainly graphite particles. However, the theoretical specific capacity of the graphite particle negative electrode is low, only 372mAh / g, and it is difficult to effectively improve the high-rate continuous charge-discharge capability and low-temperature performance. Anode materials with good performance for lithium-ion batteries are an important direction of current research

Method used

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  • Composite negative electrode material for lithium ion battery, and preparation method thereof
  • Composite negative electrode material for lithium ion battery, and preparation method thereof
  • Composite negative electrode material for lithium ion battery, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0055] The preparation method of a kind of composite negative electrode material for lithium ion battery provided by the application specifically comprises the following steps:

[0056] (1) Take 1kg of phenolic resin (carbon raw material) and place it in a box furnace, feed nitrogen until the oxygen content in the box furnace is lower than 100ppm, then heat up to 1000°C at 3° / min, and sinter for 4h to obtain 0.43kg of the first carbon precursor. The first carbon precursor is pulverized, and the particle size D50 after pulverization is controlled to be 4 μm ± 1 μm, and then large particles are removed by 320-mesh sieving. carbon precursor. The second carbon precursor is placed in a vapor deposition furnace, protected by nitrogen gas, and then heated to 700° C. at a heating rate of 3° C. / min, and then introduced into methane (a coating organic material) for vapor deposition to obtain Hard carbon particles.

[0057] (2) adding the hard carbon particles and artificial graphite ...

Embodiment 2

[0059] The difference from Example 1 is that in step (1), the carbon raw material is polyamide resin, the sintering temperature is 1100°C, and the sintering time is 3.5h. The pulverized particle size of the first carbon precursor is 5 μm±1 μm. The organic material of the coating layer of the second carbon precursor is acetylene.

[0060] In step (2), the hard carbon particles and the natural graphite particles are added to a high-efficiency VC mixer at a mass ratio of 30:70, and after stirring evenly, they are then put into a triple eccentric mixer for mixing to obtain a composite negative electrode material.

Embodiment 3

[0062] The difference from Example 1 is that in step (1), the carbon raw material is sucrose, the sintering temperature is 1300° C., and the sintering time is 3 h. The pulverized particle size of the first carbon precursor is 7 μm±1 μm. The coating organic material of the second carbon precursor is hexane.

[0063] In step (2), the hard carbon particles and natural graphite are added to the high-efficiency VC mixer by mass ratio of 20:80, and after stirring, three eccentric mixing is carried out to obtain the composite negative electrode material.

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Abstract

The invention relates to a composite negative electrode material for a lithium ion battery, and a preparation method thereof. The composite negative electrode material comprises hard carbon particles and graphite particles, the hard carbon particles and the graphite particles are uniformly dispersed, and the hard carbon particles are obtained by carrying out high temperature sintering operation, mechanical shaping operation and surface coating operation on a carbon raw material. The hard carbon particles and the graphite particles are compounded and have complementary performance advantages, so that the rate capability and the low-temperature performance of the composite material are improved, and meanwhile, the first efficiency, the high-temperature performance and the storage performance of the composite material can be ensured; and when the composite negative electrode material provided by the invention is used as a negative electrode active material of the lithium ion battery, the lithium ion battery has excellent rate capability, the raw materials are cheap, the preparation process and equipment are mature, and the composite negative electrode material is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a composite negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in the fields of 3C consumer, power and energy storage batteries due to their good stability, high energy density and no memory effect. It is very important, but the theoretical specific capacity of the graphite particle negative electrode is low, only 372mAh / g, and it is difficult to effectively improve the high-rate continuous charge-discharge capacity and low-temperature performance. Therefore, a new type of high specific capacity, excellent rate performance and low temperature performance is developed. Li-ion battery anode materials with good performance are an important direction of current research. SUMMARY OF THE INVENTION [0003] In order to solve the above problems, the presen...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/62H01M10/0525C01B32/20C01B32/05
CPCH01M4/587H01M4/625H01M10/0525C01B32/05C01B32/20Y02E60/10
Inventor 阳柳王燕飞周桂民
Owner 赣州立探新能源科技有限公司
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