Amorphous carbon negative electrode material as well as preparation method and application thereof

A negative electrode material and amorphous carbon technology, which is applied in the preparation/purification of carbon, battery electrodes, structural parts, etc., can solve the problems of performance degradation of amorphous carbon negative electrode materials, etc., to increase the adsorption energy barrier, reduce the contact internal resistance, The effect of improving mass specific capacity

Pending Publication Date: 2021-03-19
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amorphous carbon negative electrode material provided by the present invention has both high mass specific capacity and large-rate charge-discharge cycle retention, and strong adsorption resistance. The material is exposed to the air for several days, and the electrochemical performance retention rate is excellent. Effective Solve the problem of performance attenuation of amorphous carbon anode materials after long-term storage

Method used

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  • Amorphous carbon negative electrode material as well as preparation method and application thereof
  • Amorphous carbon negative electrode material as well as preparation method and application thereof
  • Amorphous carbon negative electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] In this example, the anti-adsorption amorphous carbon negative electrode material was prepared according to the following method:

[0107] (1) Put 800g of coconut shell in a box furnace under a nitrogen atmosphere and heat up to 500°C at a rate of 5°C / min, carbonize for 6h, then cool to 25°C to obtain 220g of carbonized material, which is pulverized by a ball mill. The median particle size of the material is crushed to 1.5 μm to obtain carbon particles;

[0108] (2) Add 100g of carbon particles to 500g of gelatin aqueous solution with a mass fraction of 60%, place it in an oil bath with a magnetic stirrer, heat it to 60°C and stir for 8 hours to form a uniformly mixed viscous sol ;

[0109] (3) Add 50g of sodium bicarbonate to the viscous sol, continue to stir for 2 hours, stop stirring, raise the temperature to 130°C and keep it warm for 4 hours, after the expansion reaction, freeze-dry to obtain a three-dimensional foam composite material with a mass of 420g ;

[0...

Embodiment 2

[0125] In this example, the anti-adsorption amorphous carbon negative electrode material was prepared according to the following method:

[0126] (1) Put 600g of asphalt in a box furnace under a nitrogen atmosphere and heat up to 650°C at a heating rate of 3°C / min, carbonize for 4 hours, and then cool to 25°C to obtain 200g of carbonized material, which is pulverized by a ball mill, and the material is The median particle size was crushed to 1.0 μm to obtain carbon particles;

[0127] (2) Add 200g of carbon particles into 250g of 40% thermoplastic phenolic resin alcohol solution, place in an oil bath with a magnetic stirrer, heat to 55°C and stir for 10h to form a uniformly mixed viscous viscous sol;

[0128] (3) Add 60g of sodium oxalate to the viscous sol, continue stirring for 3 hours, stop stirring, raise the temperature to 260°C and keep it warm for 4 hours, after the expansion reaction, freeze-dry to obtain a three-dimensional foam composite material with a mass of 330g...

Embodiment 3

[0136] In this example, the anti-adsorption amorphous carbon negative electrode material was prepared according to the following method:

[0137] (1) Put 800g of apricot shells in a box furnace under a nitrogen atmosphere and heat up to 500°C at a heating rate of 5°C / min, carbonize for 6 hours, and then cool to 25°C to obtain a carbonized material, which is pulverized by a ball mill, and the material is The median particle size was crushed to 0.5 μm to obtain carbon particles;

[0138] (2) Add 100g of carbon particles to 860g of 70% gelatin aqueous solution, place in an oil bath with a mechanical stirrer, heat to 60°C and stir at 30r / min for 8h to form a uniformly mixed viscous viscous sol;

[0139] (3) Add 5 g of calcium carbonate to the viscous sol, continue stirring at 30 r / min for 2 hours, stop stirring, raise the temperature to 130° C. for 4 hours, and after the expansion reaction, freeze-dry to obtain a three-dimensional foam composite material;

[0140] (4) Take the a...

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Abstract

The invention provides an amorphous carbon negative electrode material as well as a preparation method and application thereof. The amorphous carbon negative electrode material comprises a foam type carbon skeleton and carbon particles embedded in the foam type carbon skeleton, wherein the surface of the amorphous carbon negative electrode material comprises macropores and ultramicropores. The preparation method comprises the following steps: (1) subjecting carbon particles to reacting with an organic complex so as to obtain sol; (2) adding a curing and expanding agent into the sol, and conducting reacting to obtain a composite material; and (3) sintering the composite material to obtain the amorphous carbon negative electrode material. The material has a concave-convex structure similar to the surface of a lotus leaf, and the special structure can resist adsorption and provide a rapid diffusion channel for reaction ions, and shows excellent high-rate long-cycle performance in energy storage application.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and relates to a negative electrode material and its preparation method and use, in particular to an amorphous carbon negative electrode material and its preparation method and use. Background technique [0002] Due to the concept of green environmental protection and the requirements of consumers, the development of electric vehicles, smart grids, mobile phones, notebook computers, etc. is increasingly dependent on the development of lithium-ion batteries. At this stage, commercial lithium-ion battery anode materials are mainly carbon materials, which have high specific capacity (200-400mAh g-1) and low electrode potential (<1.0V vs Li + / Li), good cycle performance (more than 1000 cycles), and stable physical and chemical properties. According to the degree of crystallinity, carbon materials can be divided into two categories: graphite materials and amorphous carbon materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525C01B32/05
CPCC01B32/05H01M4/583H01M10/0525Y02E60/10
Inventor 胡龙丰汪福明徐晓东任建国贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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