Preparation methods of microcrystal graphite cathode electrode plate and button lithium battery

A microcrystalline graphite and negative electrode technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of poor electrical properties of natural microcrystalline graphite, achieve good stability, reduce usage, increase The effect of specific surface area
CN107732152AInactive Publication Date: 2018-02-23HUNAN GUOSHENG GRAPHITE TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HUNAN GUOSHENG GRAPHITE TECH CO LTD
Publication Date
2018-02-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the technical field of cathode materials for lithium batteries, and discloses a microcrystal graphite cathode electrode plate and a button lithium battery. The cycling specific capacitance of microcrystal graphite is up to 224 mAh / g at the electric current density of 100 mA / g, the first efficiency is relatively high and is more than 90%, and the stability is good. The cycling specific capacitance of the material is relatively low under the condition of high rate, the reversible specific capacity is 50 mAh / g; but the high-rate cycling performance is excellent, the higher cycling stability is still kept particularly under the condition of conversion of different charge-discharge rates, and the microcrystal graphite cathode material can be applied to the field of supercapacitors having no strict requirement on the cycling capacity but a quite high requirement on high-rate cycling stability.
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Description

technical field

[0001] The invention relates to the technical field of negative electrode materials for lithium batteries, and more specifically, to a microcrystalline graphite negative electrode sheet and a button lithium battery. Background technique

[0002] Graphite is one of the most studied carbon anode materials for lithium-ion batteries. Graphite materials have good conductivity, high crystallinity, and a good layered structure. The layers are hexagonal like benzene rings composed of carbon atoms in the sp2 state huge plane. The carbon atoms in the layer are connected by δ covalent bonds, the bond length is 0.1421nm, and the three δ bonds form an angle of 120° with each other. In addition, there is a large π bond connecting all the carbon atoms in the plane. The layers are connected by weak van der Waals force, and the interlayer spacing of ideal graphite is 0.3354nm. At a lower potential, lithium ions can reversibly intercalate and deintercalate between graphite l...

Claims

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