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Graphite modification method and application of graphite in lithium ion battery

A graphite and modification technology, applied in graphite, battery electrodes, secondary batteries, etc., can solve problems such as high cost, unsuitable for industrial production, complicated preparation process, etc., achieve simple method, excellent kinetic performance, and increase rate performance Effect

Pending Publication Date: 2022-02-18
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although the above-mentioned modification method for graphite can improve the electrochemical performance of graphite, the preparation process is complicated and the cost is high, so it is not suitable for industrial production.

Method used

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  • Graphite modification method and application of graphite in lithium ion battery
  • Graphite modification method and application of graphite in lithium ion battery
  • Graphite modification method and application of graphite in lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0049] (1) Potassium hydroxide and particle size d50 are 12 μm artificial graphite secondary particles (specific surface area is 1.2m 2 / g, 5T compaction density is 2.05g / cm 3 , graphitization degree is 94%) carry out VC homogeneous mixing according to weight ratio 15:85, put the evenly mixed mixture into pusher kiln, under nitrogen atmosphere, heat up to 900 ℃ with 3 ℃ / min heating rate to carry out carbonization, Keep warm for 4 hours, cool down naturally, and obtain a graphite material with a porous surface;

[0050] (2) Mix the surface porous graphite material and ammonium chloride with VC at a mass ratio of 90:10, put them into a pusher kiln for carbonization, and raise the temperature to 1100°C at a heating rate of 5°C / min in a nitrogen atmosphere , the carbonization time is 5h, and the finished product is obtained by sieving after natural cooling.

Embodiment 2

[0052] (1) Sodium carbonate and particle size d50 are 12 μm artificial graphite secondary particles (specific surface area is 1.2m 2 / g, 5T compaction density is 2.05g / cm 3 , degree of graphitization is 94%) uniformly mixed with VC according to the weight ratio of 20:80, put the uniformly mixed mixture into the rotary furnace, and raise the temperature to 1000°C at a heating rate of 4°C / min under nitrogen atmosphere for carbonization, heat preservation 2h, natural cooling down, obtain the graphite material with porous surface;

[0053] (2) Mix the surface porous graphite material and ammonium chloride with VC at a mass ratio of 85:15, put them into a rotary furnace for carbonization after mixing, and raise the temperature to 1200°C at a heating rate of 5°C / min under an argon atmosphere , the carbonization time is 1.5h, and the finished product is obtained by sieving after natural cooling.

Embodiment 3

[0055] (1) Potassium hydroxide and particle size d50 are 18 μ m artificial graphite secondary particles (specific surface area 1.2, 5T compaction density is 2.06, degree of graphitization 94%) carry out VC uniform mixing by weight ratio 25:75, will mix homogeneously Put the mixture into a rotary furnace, heat up to 800°C under a nitrogen atmosphere at a heating rate of 5°C / min for carbonization, keep it warm for 5 hours, and cool down naturally to obtain a graphite material with a porous surface;

[0056] (2) Mix the surface porous graphite material and urea with VC at a mass ratio of 80:20, put them into a rotary furnace for carbonization after mixing, and raise the temperature to 1000°C at a heating rate of 5°C / min under an argon atmosphere, and carbonize The time is 4 hours, and the finished product is obtained by sieving after natural cooling.

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Abstract

The invention discloses a modification method of graphite and application of the graphite in a lithium ion battery. The method comprises the following steps: 1) mixing a graphite raw material and a modifier to obtain a mixture; and 2) carrying out primary carbonization treatment on the mixture at a carbonization temperature of 700-1100 DEG C in an inert atmosphere to obtain a graphite material with a porous surface; wherein the modifier is a substance capable of reacting with the graphite raw material at the primary carbonization temperature to generate CO. According to the method, the graphite raw material and the modifier are mixed and carbonized at a certain carbonization temperature and under the inert atmosphere, pores can be formed in the surface of the graphite raw material, the porous structure of the obtained graphite material is beneficial for lithium ions to enter graphite interlayers from pores of a basal plane, the rate capability of graphite is greatly improved, moreover, the pore structure improves the electronic conductivity of the graphite material, and the graphite material has the advantages of high rate performance and excellent dynamic performance when being applied to the lithium ion battery as a negative electrode material.

Description

technical field [0001] The invention relates to the technical field of new energy, relates to a modification method of graphite and its application in lithium-ion batteries, and in particular to a modification method of graphite, a negative electrode and a lithium-ion battery comprising graphite materials prepared by the method. Background technique [0002] Graphite is a layered crystal formed by stacking graphite sheets under the action of van der Waals force. Graphite is rich in resources and low in price. It has been widely studied in the lithium battery industry because of its high reversible capacity, low charge and discharge voltage platform, no voltage hysteresis, and good conductivity when it is used as a negative electrode material in lithium batteries. [0003] Although lithium ions can be completely reversibly intercalated in graphite in theory, there is a capacity fading in the first cycle in the actual application process. Electronic insulating passivation fil...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/133H01M10/0525C01B32/21
CPCH01M4/583H01M4/133H01M10/0525C01B32/21H01M2004/021H01M2004/027Y02E60/10
Inventor 李能王志勇任娜娜皮涛
Owner HUNAN SHINZOOM TECH
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