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Surface graphene-coated high-capacity spherical hard carbon negative electrode material

A technology of graphene coating and negative electrode materials, which is applied in the direction of graphene, battery electrodes, electrical components, etc., can solve the problems of low initial efficiency, large irreversible capacity of hard carbon, and restrictions on the wide application of hard carbon, so as to achieve stable product properties, Excellent electrochemical performance and low cost

Active Publication Date: 2017-08-08
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, hard carbon has a relatively large irreversible capacity and relatively low initial efficiency, which severely limits the wide application of hard carbon in the field of high-capacity lithium-ion batteries.

Method used

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  • Surface graphene-coated high-capacity spherical hard carbon negative electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Under stirring, add coumarone resin, paraformaldehyde and p-toluenesulfonic acid into the reaction kettle with a mass ratio of 20:12:1, mix evenly, and heat up to 180°C under nitrogen atmosphere and stirring conditions for exchange Copolymerize for 4 hours, cool down to room temperature and discharge to obtain a polymerized reactant, and ball mill and sieve the polymerized reactant to obtain a hard carbon precursor with a D50 particle size of 10-15 μm;

[0026] (2) The hard carbon precursor was treated with dimethyl silicone oil at 250°C to prepare the crude polymer microspheres, cooled to room temperature and discharged, washed with ethanol to remove the silicone oil on the surface of the crude polymer microspheres, and then dried to obtain polymer microspheres;

[0027] (3) Polymer microspheres were oxidized at 260° C. for 1 h in an air atmosphere, cooled to room temperature, and discharged to obtain infusible microspheres; then they were loaded into a well-type f...

Embodiment 2

[0031] (1) Add coumarone resin, paraformaldehyde and p-toluenesulfonic acid to the reaction kettle with a mass ratio of 20:12:1 under stirring, mix well, and heat up to 180°C under nitrogen atmosphere and stirring conditions for crosslinking Polymerize for 4 hours, cool down to room temperature and discharge to obtain a polymerized reactant, and ball mill and sieve the polymerized reactant to obtain a hard carbon precursor with a D50 particle size of 10-15 μm;

[0032] (2) The hard carbon precursor was treated with dimethyl silicone oil at 250°C to obtain the crude polymer microspheres, cooled to room temperature and discharged, washed with ethanol to remove the silicone oil on the surface of the crude polymer microspheres, and then dried to obtain polymer microspheres;

[0033] (3) The polymer microspheres were oxidized at 260°C for 1 hour in an air atmosphere, cooled to room temperature, and discharged to obtain infusible microspheres; they were then put into a well-type fur...

Embodiment 3

[0037](1) Add coumarone resin, paraformaldehyde and p-toluenesulfonic acid to the reaction kettle with a mass ratio of 20:12:1 under stirring, mix well, and heat up to 180°C under nitrogen atmosphere and stirring conditions for crosslinking Polymerize for 4 hours, cool down to room temperature and discharge to obtain a polymerized reactant, and ball mill and sieve the polymerized reactant to obtain a hard carbon precursor with a D50 particle size of 10-15 μm;

[0038] (2) The hard carbon precursor was treated with dimethyl silicone oil at 250°C to obtain the crude polymer microspheres, cooled to room temperature and discharged, and the silicone oil on the surface of the crude polymer microspheres was washed with ethanol and dried to obtain polymer microspheres;

[0039] (3) Polymer microspheres were oxidized at 260°C for 1 hour in an air atmosphere, cooled to room temperature, and discharged to obtain infusible microspheres; they were then put into a well-type furnace and heat...

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Abstract

The invention relates to the technical field of a lithium ion battery, specifically to a surface graphene-coated high-capacity spherical hard carbon negative electrode material. The negative electrode material is characterized by comprising the following processing steps of (1) preparing a hard carbon precursor; (2) preparing polymer microspheres; (3) preparing spherical hard carbon; (4) preparing a graphite oxide coating body; and (5) performing carbonization and thermal reduction treatment. Compared with the prior art, the spherical hard carbon in the inner core has the advantages of unique appearance and good pore diameter distribution, uniform particle granularity distribution, high stacking density and the like; and the spherical hard carbon surface coating graphene forms the conductive network of the core-shell structure, so that ion and electron transmission can be facilitated, thereby improving the electrical conductivity of the negative electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-capacity spherical hard carbon negative electrode material coated with graphene on the surface. Background technique [0002] Lithium-ion batteries have the advantages of high cell voltage, long cycle and service life, high specific energy, good power output performance, small self-discharge, fast charge and discharge, and wide operating temperature range. Driven by energy and policies, as well as the trend of major global automakers developing electric (hybrid) vehicles, it can be expected that lithium-ion batteries will have a huge development opportunity and market. At present, the commercial lithium-ion battery anode materials are mainly graphite-based anode materials, but because the theoretical specific capacity is only 372mAh / g, it gradually cannot meet people's needs for high energy density batteries. Therefore, the development of new negative electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525C01B32/182
CPCH01M4/366H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 葛传长沈龙曾繁俊吴志红丁晓阳
Owner SHANGHAI SHANSHAN TECH CO LTD
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