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Modified natural graphite material used in lithium ion battery negative electrodes, and preparation method thereof

A lithium-ion battery and natural graphite technology, which is applied in the field of modified natural graphite negative electrode materials for lithium-ion batteries and its preparation, can solve the problems of poor cycle performance, low initial efficiency, large irreversible capacity, etc., and achieves good rate performance and initial efficiency. High, improve the effect of first-time efficiency

Inactive Publication Date: 2011-11-02
HENAN THINKER ENERGY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved in the present invention is that when natural graphite is used as a negative electrode material, the initial efficiency before modification is low, the irreversible capacity is large, and the cycle performance is poor. A modified natural graphite negative electrode material for lithium ion batteries and its preparation method are provided

Method used

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  • Modified natural graphite material used in lithium ion battery negative electrodes, and preparation method thereof
  • Modified natural graphite material used in lithium ion battery negative electrodes, and preparation method thereof

Examples

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Embodiment 1

[0023] A modified natural graphite negative electrode material for lithium ion batteries, having a core-shell structure, comprising an inner core and a shell coated on the outside of the core, the core is natural graphite, and the shell coated on the outside of the core is composed of an inner shell and an outer shell. The inner shell is a boron-containing hard carbon layer, and the outer shell is a soft carbon layer, such as figure 2 As shown, the natural graphite 1 is covered with a boron-containing hard carbon layer 2, and the boron-containing hard carbon layer 2 is covered with a soft carbon layer 3, and the natural graphite is a fixed carbon content of ≥99.0%, D50 particle size It is 8-25 micron-like spherical natural graphite, the quality of the boron-containing hard carbon layer is 4.8% of the quality of the natural graphite, and the quality of the soft carbon layer is 4.5% of the quality of the natural graphite.

[0024] A preparation method of a lithium-ion battery m...

Embodiment 2

[0028] The amount of phenolic resin in Example 1 was changed to 160 g, and other conditions remained unchanged.

[0029] The detection method is the same as in Example 1, and the test results are listed in Table 1.

Embodiment 3

[0031] The amount of boric acid in Example 1 was changed to 15 g, and other conditions remained unchanged.

[0032] The detection method is the same as in Example 1, and the test results are listed in Table 1.

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Abstract

The invention discloses a modified natural graphite material used in lithium ion battery negative electrodes. With a core-shell structure, the material comprises an inner core and a shell coated on the inner-core. The inner-core is composed of natural graphite, and the shell coated on the core is composed of an inner shell and an outer shell. The inner shell is a boron-containing hard carbon layer, and the outer shell is a soft carbon layer. The boron-containing hard carbon layer is coated on natural graphite, and the soft carbon layer is coated on the boron-containing hard layer. The method has advantages of simple technology, suitability for mass production, low graphitization processing temperature, and low cost. With advantages of small specific surface area, high tap density, high first efficiency, high specific capacity, excellent cycling performance, and good rate performance, the modified natural graphite material can be applied in power batteries.

Description

technical field [0001] The invention relates to a lithium ion battery modified natural graphite negative electrode material and a preparation method thereof. Background technique [0002] Lithium Ion Battery (LIB for short) is the third generation of small batteries after nickel-cadmium batteries and nickel-metal hydride batteries. As a new type of chemical power source, it has the outstanding advantages of high working voltage, large specific energy, stable discharge potential curve, small self-discharge, long cycle life, good low temperature performance, no memory, no pollution, etc. The batteries required by electrical appliances have the dual requirements of being small and lightweight and conducive to environmental protection. They are widely used in small electronic devices such as mobile communications, notebook computers, and all-in-one cameras. They are also an ideal power source for future electric vehicles. [0003] At present, as one of the important components ...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 余强范新吴松良
Owner HENAN THINKER ENERGY MATERIALS
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