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Application of mixed expanded graphite as negative electrode material of lithium-ion capacitor

A technology of expanded graphite and negative electrode materials, which is applied in the application field of mixed expanded graphite as the negative electrode material of lithium ion capacitors, to achieve the effect of low price, improved intercalation effect and efficiency, and enlarged graphite spacing

Inactive Publication Date: 2018-05-18
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, we can combine the respective advantages of the two graphites, and mix microcrystalline graphite and microcrystalline graphite together to prepare mixed expanded graphite. The obtained mixed expanded graphite will have better electrochemical properties and can also be used as a better adsorption material. , the specific surface area will also be greatly improved compared with before, and there is no research report on the technical method of preparing expanded graphite materials by mixing microcrystalline graphite and flake graphite as raw materials

Method used

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Embodiment 1

[0032] This embodiment provides an application of mixed expanded graphite as a negative electrode material of a lithium ion capacitor, and the lithium ion capacitor includes a positive electrode sheet, a negative electrode sheet, an electrolyte, and a separator.

[0033] The preparation method of the negative electrode sheet in this embodiment is as follows: first inject 130wt% deionized water into the stirring disperser, then add 1.5wt% sodium carboxymethylcellulose into the stirring tank, and stir at a speed of 30r / min for 60min; Add 95wt% micro-expanded graphite and 2wt% conductive carbon black to the stirring tank, and after fully wetting, vacuumize to -0.098Mpa, and stir in vacuum at a speed of 50r / min for 240min; add 1.5wt% styrene-butadiene rubber, vacuumize to -0.098Mpa, and stir in vacuum at a speed of 30r / min for 90min; pass the above slurry through a 200-mesh sieve; On both sides, after drying, the coating thickness on one side is 60 μm, the coating speed is 3m / min,...

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Abstract

The invention discloses application of mixed expanded graphite as a negative electrode material of a lithium-ion capacitor. The lithium-ion capacitor includes a positive plate, a negative plate, a diaphragm and an electrolyte, wherein the negative electrode material used by the negative plate adopts microcrystalline graphite and crystalline flake graphite to be mixed to prepare the mixed expandedgraphite material, and then the mixed expanded graphite material is used as a raw material to prepare the lithium-ion capacitor. The microcrystalline graphite is large in reserves in China, is low inthe price, and is mostly utilized with low additional value, and the invention provides a high-additional-value utilization way for the microcrystalline graphite.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and more specifically relates to the application of a mixed expanded graphite as a negative electrode material of a lithium ion capacitor. Background technique [0002] Expanded graphite is a carbon material. Using expandable graphite as raw material, when treated at high temperature (usually 700-1200°C), the substance inserted between the expanded graphite layers will decompose rapidly, and the gas generated will form a high pressure in the expandable graphite interlayer domain and expand along the c-axis direction. Expansion, bulk density from 0.7 to 1.8g / cm 3 Change to 0.003~0.03g / cm 3 , the expansion multiple is tens to hundreds of times. Due to the loose structure of expanded graphite, porous and worm-like, large surface area and high surface energy, it has excellent liquid phase adsorption performance, good plasticity, good flexibility, ductility and sealing, so it is widely...

Claims

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Application Information

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IPC IPC(8): H01G11/32H01G11/06H01G11/86
CPCY02E60/13H01G11/32H01G11/06H01G11/86
Inventor 向华政张勇
Owner HUNAN UNIV OF TECH
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