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Graphite-based composite material and preparation method thereof and lithium ion battery comprising the composite material

A technology for lithium-ion batteries and composite materials, applied in the fields of their preparation, lithium-ion batteries, and graphite-based composite materials, can solve the problems of short cycle life, large electrode expansion rate, large irreversible capacity loss, etc., to improve liquid absorption performance, Good cycle performance, high first effect and excellent effect

Active Publication Date: 2017-04-26
贝特瑞(江苏)新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above problems in the prior art, in order to solve the defects of low initial charge and discharge efficiency of natural graphite, large loss of irreversible capacity, strong dependence on electrolyte, large electrode expansion rate and short cycle life, it maintains its high Under the premise of superior capacity, the invention provides a graphite-based composite material, its preparation method and a lithium ion battery comprising the composite material

Method used

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  • Graphite-based composite material and preparation method thereof and lithium ion battery comprising the composite material
  • Graphite-based composite material and preparation method thereof and lithium ion battery comprising the composite material
  • Graphite-based composite material and preparation method thereof and lithium ion battery comprising the composite material

Examples

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Effect test

Embodiment 1

[0062] Natural spherical graphite (D50=6μm~8μm, S50=0.80~0.95) is placed in a rotary kiln, and oxygen is introduced, oxidized at 600°C for 2h, and the oxygen flow rate is 10L / h.kg to obtain oxidized natural graphite ( oxidized graphite). According to the mass ratio of 90:10, the oxidized graphite and petroleum pitch are mixed, and then 2 Under the atmosphere, place it in a fusion machine at 600°C for mechanical granulation. After 5 hours of mechanical granulation, cool the reaction product to room temperature, and then carbonize it at 1200°C to obtain a graphite-based composite material.

[0063] Electrochemical performance test:

[0064] The graphite-based composite material obtained in Example 1 was used as the negative electrode active material, mixed uniformly according to the mass ratio of negative electrode active material: CMC:SBR=96.5:1.5:2, and then placed on the copper foil current collector, dried and punched for later use.

[0065] Assembly of the button cell:

...

Embodiment 2

[0075] Natural spherical graphite (D50=6μm~8μm, S50=0.80~0.95) is placed in a rotary kiln, and oxygen is fed into it, and oxidized at 500°C for 2h, and the oxygen flow rate is 15L / h.kg, to obtain oxidized natural graphite ( oxidized graphite). According to the mass ratio of 88:12, the oxidized graphite and petroleum pitch are mixed, and then 2 Under the atmosphere, put it in a fusion machine at 650°C for mechanical granulation. After mechanical granulation for 5 hours, the reaction product was cooled to room temperature, and then carbonized at 1200°C to obtain a graphite-based composite material. The SEM of the obtained composite graphite material pictures such as figure 1 shown.

[0076] The same method as in Example 1 was used to prepare the negative electrode, assemble it into a button battery, and perform performance tests.

Embodiment 3

[0078] Natural spherical graphite (D50=6μm~8μm, S50=0.80~0.95) is placed in a rotary kiln, fed with oxygen, oxidized at 500°C for 4h, and the oxygen flow rate is 15L / h.kg to obtain oxidized natural graphite ( oxidized graphite). Mix the oxidized graphite and petroleum pitch according to the mass ratio of 85:15, and then 2 Under the atmosphere, place it in a fusion machine at 650°C for mechanical granulation. After 5 hours of mechanical granulation, cool the reaction product to room temperature, and then carbonize it at 1200°C to obtain a graphite-based composite material.

[0079]The same method as in Example 1 was used to prepare the negative electrode, assemble it into a button battery, and perform performance tests.

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Abstract

The invention discloses a graphite-based composite material and a preparation method thereof and a lithium ion battery comprising the composite material. The method disclosed by the invention comprises the following steps: 1) uniformly mixing activated natural graphite and asphalt according to a proportion, adding to a fusion machine, charging inert gas and carrying out fusion and granulation under a certain temperature; and 2) carrying out carbonization treatment or graphitization treatment on a fusion and granulation product to obtain the graphite-based composite material. The battery which is assembled and whose negative electrode is prepared by adopting the graphite-based composite material has high capacity, and good rate capability and cycle performance; the initial lithium removal specific capacity is 360.1mAh / g or more, and the initial efficiency is 91.5% or more; and the room temperature charge-discharge cycles of the finished product battery is 300 weeks and the capacity retention rate is greater than 90%.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials, in particular to a graphite-based composite material, a preparation method thereof and a lithium ion battery containing the composite material. Background technique [0002] Compared with lead-acid and nickel-metal hydride batteries, lithium-ion batteries have the advantages of high energy density, high working voltage, small size, light weight, no pollution, good safety, and long life. They are an ideal energy storage device. In recent years, lithium-ion batteries have developed vigorously in mobile portable devices (mobile phones, notebook computers, digital cameras, tablet computers, etc.), energy storage devices, power grid peak shaving, and vehicle power batteries. However, with the progress of society and With the development of science and technology, people have more and more urgent needs for miniaturized, lightweight and multi-functional devices, and also put forward...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/133H01M10/0525H01M10/058
CPCH01M4/133H01M4/587H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 周成坤苗恒潘修军周海辉
Owner 贝特瑞(江苏)新能源材料有限公司
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