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Preparation method of high capacity lithium ion battery hard carbon composite negative electrode material

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low discharge voltage, low initial efficiency, low reversible capacity, etc., achieving easy operation, short production cycle, and wide source of raw materials Effect

Active Publication Date: 2017-03-22
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, hard carbon is directly used as the negative electrode material of lithium-ion batteries, and there are still disadvantages such as low reversible capacity, low initial efficiency, and low discharge voltage.
SONY Corporation of Japan used polyfurfuryl alcohol PFA-C in 1991 to produce a hard carbon negative electrode material with a specific capacity exceeding 372mAh / g capacity, but the first discharge efficiency of the material was only about 45% and there were defects such as voltage hysteresis

Method used

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  • Preparation method of high capacity lithium ion battery hard carbon composite negative electrode material
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Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Mixing of raw materials: crush petroleum asphalt with a softening point of 120°C through a 100-mesh sieve, and uniformly mix 276g of silicon oxide with D50=3μm, 400g of paraformaldehyde and 2000g of petroleum asphalt powder in a high-speed mixer , to prepare mixed powder;

[0028] (2) Cross-linking polymerization reaction: Then feed the mixed powder and 100g p-toluenesulfonic acid into the reactor, and under nitrogen protection and stirring conditions, raise the temperature to 180°C for cross-linking polymerization reaction for 4 hours to obtain a cross-linked polymer Certainly in this step, the mixing of mixed powder and p-toluenesulfonic acid can also be completed together in the above-mentioned "raw material mixing" step;

[0029] (3) High-temperature curing treatment: under the protection of nitrogen, the cross-linked polymer was heated to 300°C for curing treatment for 2 hours, then cooled to room temperature and discharged, the obtained product was mechanicall...

Embodiment 2

[0034] (1), raw material mixing: crush the petroleum asphalt with a softening point of 120°C through a 100-mesh sieve, mix 472g, D50=3μm silicon oxide, 600g paraformaldehyde and 2000g of the petroleum asphalt powder in a high-speed mixer Mix to obtain mixed powder;

[0035] (2) Cross-linking polymerization reaction: Then feed the mixed powder and 100g p-toluenesulfonic acid into the reaction kettle, raise the temperature to 180°C for 4 hours under the protection of nitrogen and stirring to carry out the cross-linking polymerization reaction to obtain cross-linking polymerization thing;

[0036] (3) High-temperature curing treatment: under the protection of nitrogen, the cross-linked polymer was heated to 300°C for curing treatment for 2 hours, then cooled to room temperature and discharged, the obtained product was mechanically crushed and passed through a 150-mesh sieve, and the under-sieve was obtained. first powder;

[0037] (4) Pre-carbonization treatment: put the first ...

Embodiment 3

[0041] (1), raw material mixing: 2000g is pre-mixed with 8wt% urotropine, that is, hexamethylenetetramine, and the thermoplastic phenolic resin powder with a softening point of 90°C is mixed with D50 in a high-speed mixer = 425g of silicon dioxide with a thickness of 3 μm was uniformly mixed to obtain a mixed powder;

[0042] (2) Cross-linking polymerization reaction: Feed the mixed powder into the reactor, under nitrogen protection and stirring conditions, raise the temperature to 150°C for cross-linking polymerization for 4 hours to obtain a cross-linked polymer;

[0043] (3) High-temperature curing treatment: under the protection of nitrogen, the cross-linked polymer was heated to 250°C for curing treatment for 2 hours, then cooled to room temperature and discharged, the obtained product was mechanically crushed and passed through a 150-mesh sieve, and the under-sieve was obtained. first powder;

[0044] (4) Pre-carbonization treatment: put the first powder into a well-typ...

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Abstract

The invention relates to the technical field of lithium ion battery, and in particular to a preparation method of a high capacity lithium ion battery hard carbon composite negative electrode material. The method is characterized by comprising the steps of (1) mixing materials, (2) conducting the crosslinking polymerization reaction, (3) conducting the high temperature curing treatment, (4) pre-carbonizing, (5) carbonizing, and (6) cladding. In step (1), the organic polymers and crosslinking agent are pulverized, and is mixed with SiOx filler uniformly to acquire the mixture powder. Compared with the prior art, the method can solve the problem of low reversible capacity of the hard carbon negative electrode material currently available. The prepared high capacity lithium ion battery hard carbon composite negative electrode material has the advantages of being uniform in particle distribution, good in appearance, excellent in electrochemical properties and safety, having a good adaptability to the electrolyte and other additives, thus being capable of meeting the requirements of the charging and discharging properties of the negative electrode material imposed by the high capacity, high multiplying power lithium ion battery with excellent high and low temperature cycle operation performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a preparation method of a hard carbon composite negative electrode material for a high-capacity lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, long cycle life, no memory effect, high specific energy, and good safety performance. They are widely used in mobile communications, notebook computers, and large-scale energy storage. Today, lithium-ion batteries are also considered an ideal power source for electric vehicles. With the increasing demand for multifunctional portable electronic devices in the information age and the rapid development of electric vehicles, research and development of new lithium battery electrode materials with high specific energy, high rate, high safety, long life and low cost have become an important international issue. cutting-edge research areas. [0003] At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48
CPCH01M4/364H01M4/38H01M4/48Y02E60/10
Inventor 葛传长沈龙马飞吴志红丁晓阳
Owner SHANGHAI SHANSHAN TECH CO LTD
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