A kind of preparation method of high-capacity lithium-ion battery hard carbon composite negative electrode material

A technology of lithium ion battery and negative electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low discharge voltage, voltage hysteresis, and low initial efficiency

Active Publication Date: 2021-07-06
SHANGHAI SHANSHAN TECH CO LTD
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  • 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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  • A kind of preparation method of high-capacity lithium-ion battery hard carbon composite negative electrode material
  • A kind of preparation method of high-capacity lithium-ion battery hard carbon composite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Mixing of raw materials: Pulverize 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 mixing mixer , to obtain mixed powder;

[0028] (2), cross-linking polymerization reaction: then the mixed powder and 100 g of p-toluenesulfonic acid are fed into the reaction kettle, and under nitrogen protection and stirring conditions, the temperature is raised to 180 ° C for cross-linking polymerization reaction for 4h to obtain a cross-linked polymer. Of course 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 is heated to 300 ° C for curing treatment for 2 hours, then cooled to room temperature and discharged, the ob...

Embodiment 2

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

[0035] (2), cross-linking polymerization reaction: then the mixed powder and 100 g of p-toluenesulfonic acid are fed into the reaction kettle, and under nitrogen protection and stirring conditions, the temperature is raised to 180 ° C for cross-linking polymerization reaction for 4h to obtain cross-linking polymerization. thing;

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

[...

Embodiment 3

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

[0042] (2), cross-linking polymerization reaction: put the mixed powder into the reaction kettle, and under nitrogen protection and stirring conditions, heat up to 150 ° C for cross-linking polymerization reaction for 4 hours to obtain a cross-linked polymer;

[0043] (3) High temperature curing treatment: under the protection of nitrogen, the cross-linked polymer is heated to 250 ° C for curing treatment for 2 hours, and then cooled to room temperature for discharging. the first powder;

[0044] (4) Pre-carbonization treatment: put the first powder into the pit furnace, heat it up to 550°C for 1 h under nitrogen protection, cool down to room temperature and discharge, adopt jet pulve...

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Abstract

The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing a high-capacity lithium-ion battery hard carbon composite negative electrode material, which is characterized in that the following preparation steps are adopted: (1), mixing raw materials: mixing organic polymers , cross-linking agent crushed, and with SiO x Fillers are uniformly mixed to prepare mixed powder; (2), cross-linking polymerization: (3), high-temperature curing treatment; (4), pre-carbonization treatment; (5), carbonization treatment; (6), coating treatment. Compared with the prior art, the present invention can effectively solve the defect of low reversible capacity of existing hard carbon negative electrode materials, and the prepared hard carbon composite negative electrode material for high-capacity lithium-ion batteries has uniform particle distribution, good appearance, and excellent electrochemical performance. Good safety; good adaptability to electrolyte and other additives; able to meet the requirements of lithium-ion batteries with high capacity, high rate, and excellent high and low temperature cycle performance on the charge and discharge performance of negative electrode materials.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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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