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Carbon-coating and surface film performing co-modification preparation method of anode material of lithium ion secondary battery

A secondary battery and graphite negative electrode technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of deficiencies and inability to comprehensively improve the performance of graphite, achieve low cost, improve the first coulombic efficiency, and increase the amount of lithium intercalation Effect

Active Publication Date: 2014-07-02
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Scientists have done a lot of research on the modification of natural graphite, and have carried out physical and chemical modification and surface modification of natural graphite through various methods. The modified graphite obtained by many methods has great performance. Great improvement, but from many modification methods, we can easily find that a single modification method often cannot comprehensively improve the performance of graphite, and the organic combination of some modification methods that may be complementary to each other may eventually cause co-modification. receive better results
But at this stage, the theoretical research on co-modification is still relatively lacking, and can only be explored through a large number of specific experiments, so we still need to do a lot of work on the co-modification of graphite in the future

Method used

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  • Carbon-coating and surface film performing co-modification preparation method of anode material of lithium ion secondary battery
  • Carbon-coating and surface film performing co-modification preparation method of anode material of lithium ion secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Get natural graphite and crush it through a crusher, then sieve it with a 325-mesh sieve, collect the part under the sieve for subsequent experiments, weigh stearic acid and graphite in a ratio of 3:100 by stearic acid and graphite mass ratio, Dissolve the weighed stearic acid with alcohol. After the stearic acid is completely dissolved, add the weighed graphite in batches under stirring conditions, and then put the mixture into an ultrasonic oscillator for dispersion treatment. The shaking time 3 hours; after dispersing evenly, put it in an oven to dry, first dry at 90°C for 1 hour, then heat up to 130°C and dry for 3 hours; the dried mixture is crushed and sieved through a 325-mesh sieve. The lower part is subjected to carbonization treatment. The carbonization treatment condition is to first raise the temperature to 380°C for 2 hours under the isolation of air, and then raise the temperature to 800°C for 5 hours. After carbonization, the sample is crushed and pas...

Embodiment 2

[0022] Get natural graphite and crush it through a crusher, then sieve it with a 325-mesh sieve, collect the part under the sieve for subsequent experiments, weigh stearic acid and graphite in a ratio of 6:100 by stearic acid and graphite mass ratio, Dissolve the weighed stearic acid with alcohol. After the stearic acid is completely dissolved, add the weighed graphite in batches under stirring conditions, and then put the mixture into an ultrasonic oscillator for dispersion treatment. The shaking time for 3 hours. Disperse evenly and put it in an oven to dry, firstly dry at 90°C for 1 hour, then heat up to 130°C and dry for 3 hours; the dried mixture is crushed and sieved through 325 mesh, and the under-sieve part is taken for carbonization Treatment, carbonization treatment conditions: first raise the temperature to 380°C for 2 hours under the isolation of air, and then raise the temperature to 900°C for 5 hours. Weigh polydimethylsiloxane and surface carbon-coated graphite...

Embodiment 3

[0025] Get natural graphite and crush it through a crusher, then sieve it with a 325-mesh sieve, collect the part under the sieve for subsequent experiments, weigh stearic acid and graphite in a ratio of 9:100 by stearic acid and graphite mass ratio, Dissolve the weighed stearic acid with alcohol. After the stearic acid is completely dissolved, add the weighed graphite in batches under stirring conditions, and then put the mixture into an ultrasonic oscillator for dispersion treatment. The shaking time for 3 hours. Disperse evenly and put it in an oven to dry, firstly dry at 90°C for 1 hour, then heat up to 130°C and dry for 3 hours; the dried mixture is crushed and sieved through 325 mesh, and the under-sieve part is taken for carbonization Treatment, carbonization treatment conditions: first raise the temperature to 380°C for 2 hours under the isolation of air, and then raise the temperature to 1000°C for 5 hours. Weigh polydimethylsiloxane and surface carbon-coated gr...

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Abstract

The invention discloses a carbon-coating and surface-film-performing co-modification preparation method of an anode material of a lithium ion secondary battery. The method comprises the processes of: ball-milling screening, carbon coating and film performing, wherein the ball-milling screening process is used for controlling the grain size of raw material graphite to be smaller than 50 mu m, screened graphite powder is put into an ethanol solution or water solution of a carbon source for ultrasonic dispersion, then drying and thermal treatment are performed to form a carbon active layer on the surfaces of graphite particles, and the graphite particles with the carbon active layer on the surfaces are subjected to film performing treatment by using polydimethylsiloxane. According to the invention, no precious metal and metal compounds are used in the entire modification process, each step has mild reaction conditions and is easy to operate and uniform in processing the surface of the material; and a graphite anode material prepared by using the co-modification method has the advantages of high initial reversible capacity and good charge / discharge cycle performance.

Description

Technical field [0001] The invention involves a lithium ion secondary battery graphite negative material carbon covering and surface pre -formation film co -modification preparation method, which is a graphite modification technology. Background technique [0002] The electrode material is the basis for the development of lithium -ion batteries. The quality of the electrode material performance directly determines the characteristics and price of the battery.Among the many options of negative materials, graphite is considered to be a promising lithium -ion battery negative material for its advantages such as low price, extensive sources, and good conductivity. Graphite also uses its low potential platform. It has a high comparison capacity and good.The voltage platform, good conductivity, no voltage lag, etc. are concerned by the industry.However, the preparation of artificial graphite used for negative materials is as high as nearly 3000 ° C, which requires too high the equipmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 王永志
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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