Hot-isostatic-press intermediate-phase graphite anode material used in lithium battery and preparation method thereof

A technology of mesophase graphite and hot isostatic pressing, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of damaging lithium ion mobility, accelerating electrolyte reaction, and reducing charge and discharge efficiency, so as to improve discharge capacity and Effects of cycle efficiency, improvement of processing performance, and stable product properties

Inactive Publication Date: 2015-11-11
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problem when the graphite anode material is used with high compaction density is that the reaction with the electrolyte is accelerated due to the cracking of the graphite anode material and the exposure of more surface area to react with the electrolyte, resulting in a decrease in charge and discharge efficiency
[0007] In addition, due to the high compaction density, the particles are easily broken, and the space serving as the lithium ion channel in the electrode is reduced, which damages the lithium ion mobility and leads to a decrease in the load characteristics.

Method used

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  • Hot-isostatic-press intermediate-phase graphite anode material used in lithium battery and preparation method thereof
  • Hot-isostatic-press intermediate-phase graphite anode material used in lithium battery and preparation method thereof
  • Hot-isostatic-press intermediate-phase graphite anode material used in lithium battery and preparation method thereof

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Embodiment 1

[0023] Using self-baking mesophase carbon microsphere powder (particle size 12.5 μm) as raw material, it was preformed in a molding machine with a molding pressure of 25 MPa, put into a hot isostatic press, and argon gas was used as a medium to heat up and pressurize. 500°C calcination temperature and 50MPa pressure for 1 hour, then naturally lower the temperature, and then carry out graphitization high-temperature treatment (2800°C). And carry out pulverization and classification to prepare lithium ion battery negative electrode hot isostatic pressing mesophase graphite material. The half-cell capacity is 356.5mAh / g, the initial efficiency is 92.8%, and the compacted density is 1.67g / cm 3 .

Embodiment 2

[0025] Self-baking mesophase carbon microsphere powder (particle size 12.5 μm) was used as raw material, preformed in a molding machine with a molding pressure of 50 MPa, put into a hot isostatic press, and argon gas was used as a medium to heat up and pressurize. 500°C calcination temperature and 50MPa pressure for 1 hour, then naturally lower the temperature, and then carry out graphitization high-temperature treatment (3000°C). And carry out pulverization and classification to prepare lithium ion battery negative electrode hot isostatic pressing mesophase graphite material. The half-cell capacity is 358.1mAh / g, the initial efficiency is 93.2%, and the compacted density is 1.61g / cm 3 .

Embodiment 3

[0027] Using self-baking mesophase carbon microsphere powder (particle size 12.5 μm) as raw material, it was preformed in a molding machine with a molding pressure of 25 MPa, put into a hot isostatic press, and argon gas was used as a medium to heat up and pressurize. 500°C calcination temperature and 60MPa pressure for 1 hour, then naturally lower the temperature, and then carry out graphitization high-temperature treatment (3000°C). And carry out pulverization and classification to prepare lithium ion battery negative electrode hot isostatic pressing mesophase graphite material. The half-cell capacity is 355.6mAh / g, the first efficiency is 92.6%, and the compacted density is 1.65g / cm 3 .

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Abstract

The invention discloses a preparation method of a hot-isostatic-press intermediate-phase graphite anode material used in lithium batteries, wherein the preparation method includes the following steps: 1) performing pre-moulding with self-roasting mesocarbon microbeads as a raw material; 2) performing hot isostatic pressing; 3) performing graphitization; and 4) crushing and classifying a product. Compared with a reparation method in the prior art, in the preparation method in the invention, the self-roasting mesocarbon microbeads are subjected to mould-pressing pre-moulding, hot isostatic pressing and graphitization high-temperature treatment and then are crushed and classified. The material is high in compact density, is high in discharge capacity, is less in cyclic expansion and is long in cyclic life. The prepared lithium battery anode material is higher than 1.60 g / cm<3> in compact density, is higher than 355 mAh / g in initial discharge capacity, is higher than 92% in initial charging-discharging efficiency, is less than 6% in cyclic expansion (at 45 DEG C by 400 cycles), and is higher than 90% in cyclic life (by 500 cycles). The invention also relates to the graphite anode material prepared through the preparation method and a battery comprising the graphite anode material.

Description

technical field [0001] The invention relates to a hot isostatically pressed mesophase graphite negative electrode material for lithium batteries and a preparation method thereof, in particular to a mesophase graphite negative electrode which is preformed and hot isostatically pressed using self-baking mesophase carbon microspheres as raw materials The preparation method of the material and the graphite negative electrode material prepared by the method. The invention also relates to batteries comprising the graphite negative electrode material. Background technique [0002] Mesophase carbon microsphere graphitization products are excellent negative electrode materials for lithium-ion batteries. In recent years, lithium-ion batteries have been widely used in mobile phones, notebook computers, digital cameras and portable appliances. Lithium-ion batteries have excellent performances such as high energy density, high working voltage, small size, light weight, no pollution, f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/38
CPCY02E60/10
Inventor 谢秋生罗才坤陈志明薄维通江伟伟
Owner SHANGHAI SHANSHAN TECH CO LTD
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