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Composite graphite negative electrode material, lithium ion secondary battery, preparation method and application

A negative electrode material and composite graphite technology, which is applied in the field of composite graphite negative electrode materials, can solve the problems of large expansion, poor circulation, and low discharge capacity of composite graphite negative electrode materials, and achieve reduced specific surface area, improved discharge efficiency, and high-current charge and discharge performance Good results

Pending Publication Date: 2020-06-05
SHANGHAI SHANSHAN TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a composite graphite negative electrode material, a lithium-ion di Secondary battery, preparation method and application

Method used

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  • Composite graphite negative electrode material, lithium ion secondary battery, preparation method and application
  • Composite graphite negative electrode material, lithium ion secondary battery, preparation method and application
  • Composite graphite negative electrode material, lithium ion secondary battery, preparation method and application

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Embodiment 2

[0054] Add 80kg of microcrystalline graphite (D50 is 10.4μm), 20kg of needle coke raw coke powder (D50 is 15.4μm) and 30kg of coal tar pitch into the mixer and mix for 2 hours. Under the protection of nitrogen, heat treatment is carried out, and the final temperature is 500 ℃, after finishing, carry out graphitization high-temperature treatment (2800 ℃, 48 hours) after reaction product is cooled to room temperature, make composite graphite anode material of the present invention, half cell capacity 368.5mAh / g, initial efficiency 92.6%, discharge rate ( 10C / 0.2C) 93.1%.

[0055] The performance parameters of each embodiment and comparative examples are shown in table 3 below:

[0056] table 3

[0057]

[0058] As can be seen from the above data: the discharge capacity and charge-discharge efficiency in the comparative example are low, wherein,

[0059] The particle size of microcrystalline graphite in Comparative Examples 1 and 3 is too large (D50 is 20.1 μm and 25.3 μm re...

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Abstract

The invention discloses a composite graphite negative electrode material, a lithium ion secondary battery, a preparation method and application. The preparation method of the composite graphite negative electrode material comprises the following steps: carrying out heat treatment on a mixture of microcrystalline graphite, needle coke powder and asphalt at 300-700 DEG C, cooling to room temperature, and carrying out graphitization high-temperature treatment, wherein the mass ratio of the microcrystalline graphite to the needle coke powder is (1-9): 1, wherein the mass ratio of the microcrystalline graphite to the asphalt is 5: (1-2), wherein the average particle size D50 of the microcrystalline graphite is 5-20 [mu] m. The lithium ion secondary battery is high in first discharge efficiencyand discharge capacity.

Description

technical field [0001] The invention belongs to the field of lithium electronic batteries, and in particular relates to a composite graphite negative electrode material, a lithium ion secondary battery, a preparation method and an application. Background technique [0002] Compared with the original batteries, lithium-ion secondary batteries have been rapidly popularized in mobile phones, notebook computers and power tools due to their high energy density, long cycle life, and no memory effect. With the increasing demand for small, lightweight, multi-functional, and long-time driving of various products, the improvement of the capacity of lithium-ion secondary batteries mainly depends on the development and improvement of negative electrode materials. Therefore, for a long time, improving the specific capacity of lithium-ion secondary battery anode materials, reducing the first irreversible capacity, and improving the rate characteristics have always been the focus of resear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205H01M4/587H01M10/0525
CPCC01B32/205H01M4/587H01M10/0525Y02E60/10
Inventor 谢秋生董爱想陈然刘盼
Owner SHANGHAI SHANSHAN TECH CO LTD
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