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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

Inactive Publication Date: 2018-02-23
HUNAN GUOSHENG GRAPHITE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a microcrystalline graphite negative electrode sheet and its preparation for a button-type lithium battery in view of the poor electrical properties of natural microcrystalline graphite in the prior art. method

Method used

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

Examples

Experimental program
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Embodiment 1

[0055] This embodiment provides a method for preparing microcrystalline graphite for negative electrode materials of lithium batteries, comprising the following steps:

[0056] S1. Raw ore treatment: crush Lutang aphanitic graphite, and then conduct deep grinding on the microcrystalline graphite raw ore, and obtain materials with a fineness of -0.074mm through grinding, and increase the content of materials with a fineness of -0.074mm 90% of the raw ore samples are subjected to flotation, specifically as figure 1 As shown, a roughing process is adopted for four times of selection and one sweeping process, followed by drying and magnetic separation to obtain microcrystalline graphite with a fixed carbon content of 90%;

[0057] Wherein, the properties of the Lutang aphanitic graphite described in step S1 are as follows: moisture 2.4%, volatile matter 2.99%, ash content 18.37%, carbon content 78.64%, specific surface area 12.8 m2 / g.

[0058] S2. acid leaching purification: the ...

Embodiment 2

[0062] The implementation is basically the same as in Example 1, except that the process conditions are different in step S2, as follows:

[0063] S2. acid leaching purification: the microcrystalline graphite obtained in step S1 is mixed with a mixed acid, the mixed acid is a mixed acid of HF and HCL, the liquid-solid ratio of the mixed acid to graphite is 2ml / g, the volume content of HF is 30%, and that of HCL The volume content is 10%, and then carry out acid leaching under normal pressure under the conditions of temperature 60°C and reaction time 1h. The leaching residue is washed with distilled water or deionized water until the graphite precipitates when the washing solution is neutral, and then filtered. Dry at ~150°C for 2-3 hours to obtain purified microcrystalline graphite with a fixed carbon content of 99.12%.

Embodiment 3

[0065] The implementation is basically the same as in Example 1, except that the process conditions are different in step S2, as follows:

[0066] S2. acid leaching purification: the microcrystalline graphite obtained in step S1 is mixed with a mixed acid, the mixed acid is a mixed acid of HF and HCL, the liquid-solid ratio of the mixed acid to graphite is 3.5ml / g, the volume content of HF is 60%, and the HCL The volume content is 20%, and then carry out normal pressure acid leaching at a temperature of 80°C and a reaction time of 4 hours. The leaching residue is washed with distilled water or deionized water until the graphite precipitates when the washing solution is neutral, and then filtered, and heated at a temperature of Dry at 80-150° C. for 2-3 hours to obtain purified microcrystalline graphite with a fixed carbon content of 99.56%.

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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.

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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Application Information

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IPC IPC(8): H01M4/133H01M4/1393H01M4/62H01M10/0525H01M10/058
CPCH01M4/133H01M4/1393H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 林前锋李丽萍
Owner HUNAN GUOSHENG GRAPHITE TECH CO LTD
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