Preparation method of modified graphite cathode material of lithium-ion power battery

A graphite negative electrode and power battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor practicability and complicated process, achieve low production cost, simple process flow, and improve cycle performance.

Inactive Publication Date: 2012-07-04
中聚电池研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the processes are complicated and not very practical. The present invention has low investment, simple process, low cost and potential industrialization

Method used

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  • Preparation method of modified graphite cathode material of lithium-ion power battery

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Comparison scheme
Effect test

Embodiment 1

[0019] (1) Under constant stirring, dissolve 2g of sucrose in 100ml of deionized water to make it a diluted solution;

[0020] (2) Slowly add 20g of natural graphite to the above solution, control the temperature at 85°C, and stir vigorously until the deionized water is evaporated to dryness;

[0021] (3) Vacuum-dry the mixture obtained in step (2) at 100°C for 24 hours;

[0022] (4) Put the dried mixture in step (3) into a porcelain ark, compact it slightly, and place it in an inert gas N 2 Or under the protection of Ar, the temperature was raised to 700°C at 5°C / min, kept for 3h, and then naturally cooled to room temperature, and the obtained product was pulverized to obtain the modified graphite negative electrode material.

Embodiment 2

[0024] (1) Under constant stirring, dissolve 3g of glucose in 150ml of deionized water to make it into a diluted solution;

[0025] (2) Slowly add 30g of natural graphite into the above solution, control the temperature at 95°C, and stir vigorously until the deionized water is evaporated to dryness;

[0026] (3) Vacuum-dry the mixture obtained in step (2) at 110°C for 18 hours;

[0027] (4) Put the dried mixture in step (3) into a porcelain ark, compact it slightly, and place it in an inert gas N 2 Or under the protection of Ar, the temperature was raised to 800°C at 6°C / min, kept for 5h, and then naturally cooled to room temperature, and the obtained product was pulverized to obtain a modified graphite negative electrode material.

Embodiment 3

[0029] (1) Under constant stirring, dissolve 4g of soluble starch in 200ml of deionized water to make it a diluted solution;

[0030] (2) Slowly add 40g of natural graphite into the above solution, control the temperature at 90°C, and stir vigorously until the deionized water is evaporated to dryness;

[0031] (3) Vacuum-dry the mixture obtained in step (2) at 120°C for 20 hours;

[0032] (4) Put the dried mixture in step (3) into a porcelain ark, compact it slightly, and place it in an inert gas N 2 Or under the protection of Ar, the temperature was raised to 900°C at 8°C / min, kept for 2h, and then naturally cooled to room temperature, and the obtained product was pulverized to obtain a modified graphite negative electrode material.

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Abstract

The invention aims at providing a preparation method of a graphite cathode material of a lithium-ion power battery. The preparation method comprises the steps of: firstly dissolving a soluble saccharide material into deionized water, then adding graphite and stirring the mixture violently to make the graphite more uniformly wrapped by the saccharide material, and finally enabling amorphous carbon after high temperature pyrolysis to totally wrap the surface of the graphite, thereby being more favorable for large-current discharge and improving the cycling performance of the battery. The preparation method is simple in process flow and low in production cost, the carbon can be wrapped relatively complete, and the graphite cathode material has the potentiality of large-scale industrial production.

Description

technical field [0001] The invention discloses a preparation method of a modified graphite negative electrode material for a lithium-ion power battery, and belongs to the technical field of battery production and preparation. Background technique [0002] Lithium-ion battery is a new generation of secondary battery after nickel-metal hydride battery since the 1990s. Because of its advantages such as high working voltage, high energy density, long cycle life, small self-discharge rate, and no memory effect, it has become a The power source of choice in today's society. After the miniaturization technology of lithium batteries is relatively mature, the development of large lithium-ion power batteries and related materials has become an urgent need. At present, the bottlenecks affecting the development of power batteries are: one is cost, and the other is battery performance (high rate charge and discharge performance, fast charge and discharge time, long cycle life, and adapt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/12Y02E60/10
Inventor 康书文兰亚超
Owner 中聚电池研究院有限公司
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