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Cathode material for lithium ion battery, preparation method of cathode material and lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as unfavorable mass production and processing, large fluctuations in product performance, poor product consistency, etc., to achieve reformation optimization, reversible The effect of increasing capacity and improving environmental friendliness

Inactive Publication Date: 2019-02-15
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process is cumbersome, the production efficiency is low, and the performance of the obtained product fluctuates greatly, and the consistency of the product is poor, which is not conducive to mass production and processing.

Method used

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  • Cathode material for lithium ion battery, preparation method of cathode material and lithium ion battery
  • Cathode material for lithium ion battery, preparation method of cathode material and lithium ion battery
  • Cathode material for lithium ion battery, preparation method of cathode material and lithium ion battery

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preparation example Construction

[0035] A method for preparing negative electrode materials for lithium ion batteries, comprising:

[0036] Put the raw ore coarse particles with a microcrystalline graphite content of 65-85% in a ball mill, and after ball milling at 300-500r / min for 5-7h, perform flotation, drying, and magnetic separation to obtain a D50 of 5-100um and a carbon content of In more than 90% of the microcrystalline graphite powder, put the microcrystalline graphite powder into the mixed acid solution with a volume ratio of hydrofluoric acid:hydrochloric acid=7-9:1-3, heat at 45-75°C, and stir for 2.5-3.5h , suction filtration, washing the filtrate with water until the pH of the eluting liquid is greater than 4, filtering and drying the filtrate to obtain a precursor a with a fixed carbon content greater than 95%; the precursor a is a microcrystal with low carbon and high acidity Graphite powder, the existing precursor a is generally high-carbon neutral microcrystalline graphite powder, but it tak...

specific Embodiment 1

[0037] A preparation method for a negative electrode material for a lithium ion battery, comprising:

[0038]The raw ore coarse particles with a microcrystalline graphite content of 75% are placed in a ball mill, and after ball milling at 400r / min for 6 hours, flotation, drying, and magnetic separation are performed to obtain microcrystalline graphite with a D50 of 5-100um and a carbon content of more than 90%. Crystalline graphite powder, put the microcrystalline graphite powder into the mixed acid solution with a volume ratio of hydrofluoric acid: hydrochloric acid = 8:2, heat at 65°C, stir for 3 hours, filter with suction, wash the filtrate with water until the pH of the washed liquid greater than 4, the filtrate is filtered and dried to obtain a precursor a with a fixed carbon content greater than 95%; the precursor a, binder, catalyst and auxiliary agent are placed in the In the ball mill, the binder is coal tar pitch, the catalyst is silicon carbide, the particle size D5...

specific Embodiment 2

[0039] A preparation method for a negative electrode material for a lithium ion battery, comprising:

[0040] The raw ore coarse particles with a microcrystalline graphite content of 68% are placed in a ball mill, and after ball milling at 450r / min for 7 hours, flotation, drying, and magnetic separation are performed to obtain microcrystalline graphite with a D50 of 5-100um and a carbon content of more than 90%. Crystalline graphite powder, put the microcrystalline graphite powder into the mixed acid solution with a volume ratio of hydrofluoric acid: hydrochloric acid = 8:2, heat at 65°C, stir for 3 hours, filter with suction, wash the filtrate with water until the pH of the washed liquid is greater than 4, the filtrate is filtered and dried to obtain a precursor a with a fixed carbon content greater than 95%; the precursor a, binder, catalyst and auxiliary agent are placed in a mass ratio of 80:30:10:8 In the ball mill, the binder is coal tar pitch, the catalyst is silicon ca...

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Abstract

The invention relates to the field of lithium batteries, and discloses a cathode material for a lithium ion battery, a preparation method of the cathode material, and a lithium ion battery. The methodcomprises the following steps: mixing a microcrystalline graphite powder and acid for hot dipping treatment and water washing to form a precursor a, ball-milling and mixing the precursor a, an adhesive agent, a catalyst and an assistant for briquetting to form a precursor b, sintering the precursor b in a shielding gas atmosphere, then performing high temperature graphitization to form a precursor c, crushing, balling and grading the precursor c to form a precursor d, hot-mixing the precursor d and a carbon source to form a precursor e, and performing high-temperature sintering and screeningon the precursor e in an inert atmosphere to form the cathode material for the lithium ion battery. With the adoption of the low carbon and high acidity microcrystalline graphite graphite powder, thetimes of pickling and water washing in a production process are reduced; with the adoption of a blending, briquetting and graphitization manner, a microcrystalline graphite structure is reformed and optimized; and an amorphous carbon material coating on the outermost layer improves initial coulomb efficiency of the material.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a negative electrode material for a lithium ion battery, a preparation method thereof, and a lithium ion battery. Background technique [0002] At present, commercial lithium-ion batteries generally use natural flake graphite or artificial graphite as the negative electrode material. However, the cycle performance of natural flake graphite or artificial graphite as anode material is poor. [0003] Natural microcrystalline graphite, also known as cryptocrystalline graphite, amorphous graphite or earthy graphite, is composed of many tiny graphite crystals in structure, with a high degree of graphitization but a high content of mineral impurities. Although it has good However, there are disadvantages such as low initial coulombic efficiency and low reversible capacity. Natural microcrystalline graphite has a wide range of sources, and my country has huge reserves. Compared...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525
CPCH01M4/366H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 车欢张言齐士博陈小平
Owner 桑顿新能源科技(长沙)有限公司
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