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Lithium ion battery cathode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of battery discharge capacity, capacity retention rate, cycle life, and other issues that are difficult to meet, and achieve high discharge capacity. , the effect of reducing irreversible losses, energy consumption and low production costs

Active Publication Date: 2011-11-23
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-ion secondary batteries are rapidly marketed under the impetus of carbon materials as negative electrodes, but there are also some problems in the rapid marketization of lithium-ion batteries. For example, when most batteries are used at normal or higher temperatures, All can meet its performance requirements, but when used under low temperature conditions, lithium precipitation will occur during charging and discharging, which will lead to a sharp decline in some important indicators such as the discharge capacity, capacity retention rate and cycle life of the battery. At present, most of the solutions are to improve its low-temperature performance by replacing the low-temperature electrolyte, but while satisfying its low-temperature performance, other performances are difficult to meet, and the problem has not been fundamentally solved.

Method used

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  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Grinding large particles of graphite into fine powder with a particle size D50 of 10 μm,

[0036] 2. Mix the above-mentioned graphite powder and epoxy resin according to the mass ratio of 100:1, and react at 400°C for 10 hours. After the reaction time is reached, lower the reaction temperature to room temperature and pass it through a 200-400 mesh screen.

[0037] 3. After the reaction in step 2, mix the above product with ethylene tar according to the mass ratio of 1:100, and react at 400°C for 10 hours;

[0038] 4. After the reaction in step 3, the mixture is first roughly washed in washing oil, and then finely washed with its pyridine;

[0039] 5. The washed composite material is subjected to graphitization treatment in a high-temperature furnace at 2800° C. for about 10 hours to obtain a core-shell type negative electrode material.

Embodiment 2

[0041] 1. Grinding large particles of graphite into fine powder with a particle size D50 of 15 μm,

[0042] 2. Mix the above-mentioned graphite powder and phenolic resin according to the mass ratio of 100:3, and react at 550°C for 5 hours. After the reaction time is reached, reduce the reaction temperature to room temperature and pass it through a 200-400 mesh screen.

[0043] 3. After the reaction in step 2, mix the above product with petroleum asphalt according to the mass ratio of 1:50, and react at 600°C for 3 hours;

[0044]4. After the reaction in step 3, the mixture is first roughly washed in washing oil, and then finely washed with toluene;

[0045] 5. The washed composite material is graphitized in a high-temperature furnace at 3000° C. for about 35 hours to obtain a core-shell negative electrode material.

Embodiment 3

[0047] 1. Grinding the mixture of large particles of natural graphite and artificial graphite into a fine powder with a particle size of D50 of 5 μm,

[0048] 2. Mix the above-mentioned graphite powder with the mixture of phenolic resin and epoxy resin according to the mass ratio of 100:5, and react at 300°C for 15h. After the reaction time is reached, reduce the reaction temperature to room temperature and pass it for 200- 400 mesh screen,

[0049] 3. After the reaction in step 2, mix the above product with a mixture of ethylene tar and coal tar (ethylene tar: coal tar = 1:1) according to the mass ratio of 1:50, and react at 500°C for 6 hours;

[0050] 4. After the reaction in step 3, the mixture is first roughly washed in washing oil, and then finely washed with toluene;

[0051] 5. The composite material after washing is graphitized in a high-temperature furnace at 2000° C. for about 30 hours to obtain a core-shell type negative electrode material.

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Abstract

The invention discloses a lithium ion battery cathode material and a preparation method thereof. The preparation method adopts graphite micropowder as a core material and comprises the following steps of coating at least one carbon compound on the surface of the core material to form a first coating layer, carrying out a secondary coating process by utilizing at least one carbon compound to form a second coating layer, and carrying out graphitization processing to form a graphite material with a shell-core structure. In the invention, a novel cathode material is synthesized through a two-step granulation method, and can reduce or avoid that a lithium ion battery produces a lithium precipitating phenomenon when the lithium ion battery is charged and discharged at low temperature, thus reduce irreversible loss which belongs to Li <+> and is produced in a lithium ion battery charging-discharging process at low temperature.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a lithium ion battery negative electrode material and a lithium ion battery negative electrode material prepared by the method. Background technique [0002] Lithium-ion battery is a pollution-free green battery successfully developed at the end of the 20th century. Compared with traditional batteries, it has the advantages of high average discharge voltage, relatively large volume capacity and mass capacity, long discharge time, and light weight. Lithium-ion secondary batteries are rapidly marketed under the impetus of carbon materials as negative electrodes, but there are also some problems in the rapid marketization of lithium-ion batteries. For example, when most batteries are used at normal or higher temperatures, All can meet its performance requirements, but when used under low temperature conditions, lithium precipitation will occur du...

Claims

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Application Information

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IPC IPC(8): H01M4/1393
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 安伟峰何伟潘启明何名
Owner SHENZHEN BAK POWER BATTERY CO LTD
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