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Preparation method of resin-based hard carbon negative electrode material

A negative electrode material and resin-based technology, which is applied in the field of preparation of power supply negative electrode materials and resin hard carbon negative electrode materials, can solve the problems of low initial Coulombic efficiency and capacity of hard carbon, difficult industrialization, poor uniformity, etc., to achieve uniform impregnation, Uniform carbonization and high density

Inactive Publication Date: 2020-02-21
BAOWU CHARCOAL MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent 201310007551.6 discloses a preparation method of a hard carbon negative electrode material, including: the resin is a hard carbon matrix, and the carbon material is used as a coating to obtain a hard carbon negative electrode material. This method uses a solid material as a coating, and the uniformity is poor
Chinese patent 201510685624.6 discloses a phenolic resin / coal tar pitch composite base modified hard carbon negative electrode material, its preparation method and its application. The first coulombic efficiency and capacity of the hard carbon prepared by this method are relatively low
Chinese patent 201611136195.8 discloses a new method for preparing hard carbon. The phenolic resin is subjected to freeze-drying, sintering, and chemical vapor deposition to obtain hard carbon with a uniform surface. This method has low yield, high energy consumption, and great difficulty in industrialization

Method used

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  • Preparation method of resin-based hard carbon negative electrode material
  • Preparation method of resin-based hard carbon negative electrode material
  • Preparation method of resin-based hard carbon negative electrode material

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Experimental program
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Embodiment 1

[0032] Such as Figure 4 As shown, use coumarone resin (softening point 130°C, carbon residue 10%) as the skeleton, fully carbonize at 420°C for 5 hours, and then use impregnating agent pitch (softening point 25°C, QI 2.5%, carbon residue 30%) %) impregnation, the ratio of resin to impregnating agent is 1:2, continue to carbonize at 450°C, after the carbonized material is crushed, the median particle size D 50 The negative electrode material is 10 μm, and then carbonized at 1400°C at high temperature. The obtained negative electrode material has a high initial Coulombic efficiency (83%) and a first reversible capacity of 310.8mAh / g. The material was tested for 50 charge-discharge cycles at 5C. Reversible capacity retention The rate is 97.2%.

Embodiment 2

[0034] Use petroleum resin (softening point 150°C, carbon residue 15%) as the skeleton, fully carbonize at 450°C for 5 hours, and then use impregnating agent pitch (softening point 25°C, QI 3.0%, carbon residue 35%) impregnation, resin The ratio with the impregnating agent is 1:2, continue to carbonize at 450°C, after the carbonized material is crushed, the median particle size D 50 The negative electrode material is 15μm, and then carbonized at 1400°C. The obtained negative electrode material has a high first-time Coulombic efficiency (85%) and a first-time reversible capacity of 324.3mAh / g. The material was tested for 50 charge-discharge cycles at 5C. Reversible capacity retention The rate is 98.9%.

Embodiment 3

[0036] Use phenolic resin (softening point 115°C, carbon residue 20%) as the skeleton, fully carbonize at 500°C for 5 hours, and then use impregnating agent pitch (softening point 30°C, QI 3.5%, carbon residue 40%) impregnation, resin The ratio with the impregnating agent is 1:2, continue to carbonize at 450, and the carbonized material is crushed to obtain a median particle size D 50 The negative electrode material is 20μm, and then carbonized at 1400°C. The obtained negative electrode material has a high first-time Coulombic efficiency (90%) and a first-time reversible capacity of 332.5mAh / g. The material was tested for 50 charge-discharge cycles at 5C. Reversible capacity retention The rate is 99.0%.

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Abstract

The invention relates to a preparation method of a resin-based hard carbon negative electrode material. The method comprises the following steps of S1, carbonizing a resin raw material at 350-500 DEGC, putting the resin raw material into an impregnant, and carrying out impregnation at 60-100 DEG C; S2, taking out the resin raw material, carbonizing the resin raw material at 450-500 DEG C, and crushing the resin raw material until the median particle size is 10-40 [mu]m; and S3, carrying out carbonization at 1,000-1,400 DEG C to obtain the resin-based hard carbon negative electrode material. Compared with the prior art, the production method of the resin-based hard carbon negative electrode material has the advantage that based on molecular structures of coumarone resin, petroleum resin, phenolic resin and the like, the softening points and the market demands, hard carbon negative electrode materials with different particle sizes are obtained through carbonization, impregnation, crushing and high-temperature carbonization.

Description

technical field [0001] The invention relates to a hard carbon negative electrode material that solves the problem of high-power charging and discharging, specifically a method for preparing a resin hard carbon negative electrode material, and provides an ideal power supply for high-end energy storage systems such as pure electric vehicles, hybrid vehicles, and space technology Negative material. Background technique [0002] As a clean and efficient green power source, lithium-ion batteries have been commercialized since Japan’s Sony Corporation used petroleum coke as the negative electrode material in 1991, because of their excellent cycle life, high operating voltage, and high energy density. Lithium-ion batteries have attracted widespread attention once they were launched, and have quickly become a star in energy storage devices. In recent years, with the rapid development of new energy vehicles (such as EV and HEV), higher requirements have been placed on the performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/587H01M10/0525
CPCC01B32/05H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 侯文杰刘春法夏剑忠周响弟陈燕朱春燕
Owner BAOWU CHARCOAL MATERIAL TECH CO LTD
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