Preparation method of large-size graphene/graphite composite negative pole material

A technology of negative electrode material and large size, applied in the field of preparation of composite negative electrode material, can solve the problems of low initial coulombic efficiency, high discharge platform, low energy density and power density, etc. Effect

Active Publication Date: 2015-05-13
内蒙古元瓷新材料科技有限公司
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low energy density and power density, high discharge platform and low first coulombic efficiency in existing graphite negative electrode materials, and to provide a preparation method of large-scale graphene / graphite composite negative electrode materials

Method used

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  • Preparation method of large-size graphene/graphite composite negative pole material
  • Preparation method of large-size graphene/graphite composite negative pole material
  • Preparation method of large-size graphene/graphite composite negative pole material

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specific Embodiment approach 1

[0030] Specific embodiment one: this embodiment is a kind of preparation method of large-scale graphene / graphite composite negative electrode material and is finished according to the following steps:

[0031] 1. Preparation of large-size graphene oxide:

[0032] ①. Add flake graphite with a particle size of 300 μm to 500 μm into the mixed acid of sulfuric acid and nitric acid, then stir and react at a stirring speed of 300r / min to 500r / min for 24h to 48h, and then filter to obtain black powder ;Then use distilled water to wash the black powder 3 to 5 times, and then dry at a temperature of 60°C to 80°C for 12h to 24h to obtain the dried black powder; put the dried black powder into the power of 500W to 1000W 60s~180s in the microwave oven to get worm-like graphite;

[0033] The particle diameter described in step 1. is that the quality of the flake graphite of 300 μm~500 μm and the volume ratio of the mixed acid of sulfuric acid and nitric acid are 3g:(400mL~450mL);

[0034...

specific Embodiment approach 2

[0050] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the particle size of the large-sized graphene oxide obtained in step 1 ③ is 10 μm to 100 μm. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0051] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the particle size of the graphite in step 2 ② is 10 μm-500 μm. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a preparation method of a large-size graphene/graphite composite negative pole material, and relates to a preparation method of a composite negative pole material. The invention aims to solve the problems that the energy density and the power density are low, a discharging platform is high and first Kulun efficiency is low existing in an existing graphite negative pole material. The method comprises the following steps: (1) preparing large-size graphene oxide; (2) preparing a large-size graphene oxide and graphite compound; (3) annealing the compound so as to obtain the large-size graphene/graphite composite negative pole material. The lithium storing capacity of the large-size graphene/graphite composite negative pole material prepared by the preparation method disclosed by the invention is 372 mAh/g-401 mAh/g, the Kulun efficiency is 85%-90%, the capacity of the large-size graphene/graphite composite negative pole material achieves 162 mAh/g at the rate of 5C, which is 2 times higher than that of an ordinary business graphite, and after 2000 cycles, the reservation of the capacity is more than 95%. According to the invention, the preparation method of the large-size graphene/graphite composite negative pole material can be obtained.

Description

technical field [0001] The invention relates to a preparation method of a composite negative electrode material. Background technique [0002] In recent years, lithium-ion batteries have been more and more widely used in military fields such as electronic products, electric vehicles, and aerospace. It has also become one of the research and development hotspots in the international academic and industrial circles. However, the current commercial lithium-ion battery anode materials still cannot meet the needs of rapid economic and industrial development in terms of energy density and power density. In order to solve this problem, it is imminent to develop new materials. The carbon anode material represented by graphite has been very mature as a commercial anode material technology, but graphite 372mAh g -1 The theoretical specific capacity greatly limits its wide application in the future. In order to solve this problem, new carbon anode materials including soft carbon, hard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/36
CPCY02E60/10
Inventor 刘晓旭
Owner 内蒙古元瓷新材料科技有限公司
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