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Core-shell structured carbon for cathode material of lithium ion battery and preparation method thereof

A lithium-ion battery, core-shell structure technology, applied in the direction of battery electrodes, secondary batteries, structural parts, etc., can solve the problems that limit the large-scale application of lithium-ion batteries, poor current collector adhesion, low Coulombic efficiency, etc., to achieve superior The effect of power performance, low cost, and high Coulombic efficiency

Inactive Publication Date: 2011-02-09
DONGGUAN MCNAIR NEW POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its large specific surface area, the material has low Coulombic efficiency for the first time and poor adhesion to current collectors, which limits its large-scale application in the lithium-ion battery industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Using coal tar pitch as soft carbon precursor material, according to m 煤焦油沥青 :m 硬碳 =1:100 relationship, weigh 2g of coal tar pitch and 200g of hard carbon material. Dissolve coal tar pitch with toluene as a solvent, then add hard carbon material to ultrasonically disperse for 0.5h, dry, and coat coal tar pitch on the hard carbon surface. The obtained material was put into a tube furnace, heated to 1500°C at a heating rate of 10°C / min under the protection of argon, and kept at a constant temperature for 5 hours to ensure that a soft carbon shell was formed on the hard carbon surface after the coal tar pitch was carbonized, and cooled naturally to obtain a core Shell-structured carbon materials.

[0033] Take 50.0g of core-shell structure carbon material, add 5.0g of PVDF as a binder, add N-methyl-2-pyrrolidone dropwise to mix the above mixture evenly into a slurry, and dry it to semi-dry according to the battery plate manufacturing process. It is pressed on the copper...

Embodiment 2

[0035] Using petroleum pitch as soft carbon precursor, according to m 石油沥青 :m 硬碳 =1:80 relationship, weigh 2g of petroleum pitch and 160g of hard carbon material. The petroleum pitch and the hard carbon material were ultrasonically dispersed in p-xylene for 2 h, dried, and the soft carbon precursor was coated on the surface of the hard carbon material. Put the obtained material into a tube furnace, heat it up to 1000°C at a heating rate of 10°C / min under the protection of argon and keep the temperature constant for 5 hours to ensure that a soft carbon shell is formed on the hard carbon surface after the petroleum pitch is carbonized, and then naturally cool to obtain a core shell Structural carbon materials.

[0036]Take 50.0g of core-shell structure carbon material, add 5.0g of PVDF as a binder, add N-methyl-2-pyrrolidone dropwise to mix the above mixture evenly into a slurry, bake it to semi-dry according to the battery manufacturing process, and put it Press on the coppe...

Embodiment 3

[0038] Using petroleum pitch as soft carbon precursor, according to m 石油沥青 :m 硬碳 =10:100 relationship, weigh 2g of petroleum pitch and 20g of hard carbon material. The petroleum pitch and the hard carbon material were ultrasonically dispersed in toluene for 2 h, dried, and a layer of soft carbon precursor was coated on the hard carbon surface. Put the obtained material into a tube furnace, heat it up to 900°C at a heating rate of 5°C / min under the protection of argon, and keep the temperature constant for 2 hours to ensure that a soft carbon shell is formed on the hard carbon surface after the petroleum pitch is carbonized, and naturally cool to obtain a core shell Structural carbon materials.

[0039] Take 50.0g of core-shell structure carbon material, add 5.0g of styrene-butadiene rubber as a binder, add absolute ethanol dropwise to mix the above mixture evenly into a slurry, and press it on the copper foil according to the battery manufacturing process when it is baked to...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to core-shell structured carbon for a cathode material of a lithium ion battery and a preparation method thereof, and the lithium ion battery taking the core-shell structured carbon as the cathode material and a preparation method thereof. The core-shell structured carbon comprises a hard carbon material serving as a 'core' and soft carbon 'shell' which is coated on the surface of the 'core'. On the one hand, the hard carbon material serving as the 'core' provides a large number of spaces for storing lithium and channels for lithium ions to move, and the energy density and power density of the material are improved, and on the other hand, the soft carbon 'shell' with a graphite structure ensures that the material has high coulombic efficiency and cycle performance, so that the lithium ion battery made of the core-shell structured carbon serving as the cathode material has high capacity, high power characteristic, high cycle performance and high first charge and discharge coulombic efficiency, the preparation method is simple, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a core-shell structure carbon for lithium-ion battery negative electrode materials and a preparation method thereof. Background technique [0002] Since 1994, the research on lithium-ion battery anode materials has mainly focused on carbon materials, alloy materials and composite materials. Carbon materials are the earliest anode materials for lithium-ion batteries that were researched and commercialized by people, and they are still one of the focuses of everyone's attention and research. Natural graphite and artificial graphite are the most widely used carbon-based anode materials. Artificial graphite prepared by doping, structural adjustment or surface modification of graphitizable carbon such as petroleum coke and high-temperature graphitization treatment, the specific capacity can reach 330-350mAh·g -1 , while having good cycle performance and low price, but ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M10/0525H01M4/133H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 杨全红贺艳兵苏方远陈学成游从辉李中延罗永莉马莉刘东
Owner DONGGUAN MCNAIR NEW POWER
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