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Lithium ion battery using graphite having multiphase structure as negative pole material

A lithium-ion battery, multi-phase structure technology, applied in the direction of battery electrodes, secondary batteries, structural parts, etc., can solve the problems of high contact resistance of graphite material particles, affecting high-current charge and discharge performance, and affecting the use of conventional graphite materials. Achieve the effect of improving electronic conductivity and thermal conductivity, good power and cycle performance, and good electrochemical performance

Inactive Publication Date: 2013-05-08
MCNAIR TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to meet the current demand for lithium-ion battery performance, conventional graphite materials also need to be further optimized, and the graphite optimization process will lead to greater crystallinity on the surface of graphite material particles, fewer defect points, and the particles are generally Spherical, small contact area, resulting in large contact resistance between graphite material particles, which affects the performance of high-current charging and discharging, and also generates more heat, which reduces the power performance of the battery and brings safety hazards , seriously affecting the use of conventional graphite materials in power batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A lithium-ion battery using multi-phase structure graphite as negative electrode material;

[0023] First, thin-layer graphite and artificial graphite, according to m (薄层石墨) :m (人造石墨) = 0.05:1 relationship, weigh 5.0g of thin-layer graphite and 100.0g of artificial graphite, place them in a ball mill for 2 hours, take them out, add 2g of glucose, and raise the temperature to 700°C at a heating rate of 5°C / min under nitrogen protection Constant temperature for 2h, after cooling, a fully dispersed graphite negative electrode material with multi-phase structure is obtained;

[0024] The multi-phase structure graphite negative electrode material is pressed on the current collector to make the negative electrode plate.

[0025] Then lithium cobaltate is used as the active material, after mixing and coating of positive and negative active materials, rolling, slitting, lamination or winding of pole pieces, packaging, liquid injection, formation, degassing, volume separation,...

Embodiment 2

[0029] A lithium-ion battery using multi-phase structure graphite as negative electrode material;

[0030] Thin-layer graphite and natural graphite first, according to m (薄层石墨) :m (石墨化中间相碳微球) = 0.1:1 relationship, weigh 5.0 g of thin-layer graphite and 50.0 g of graphitized mesocarbon microspheres, and place them in a ball mill. Take it out after ball milling for 6 hours, add 2g of glucose, and under the protection of nitrogen, raise the temperature to 1000°C at a heating rate of 10°C / min for 1h, and after cooling, a completely dispersed graphite negative electrode material with a multi-phase structure is obtained;

[0031] The multi-phase structure graphite negative electrode material is pressed on the current collector to make the negative electrode plate.

[0032] Then, lithium iron phosphate is used as the active material, after mixing and coating of positive and negative active materials, rolling, slitting, lamination or winding of the pole piece, packaging, liquid inje...

Embodiment 3

[0036] A lithium-ion battery using multi-phase structure graphite as negative electrode material;

[0037] First, the mesophase carbon microspheres and thin-layer graphite materials are mixed according to m (薄层石墨) :m (天然石墨) =0.5:1 relationship, weigh 100.0 g of natural graphite and 50.0 g of thin-layer graphite material, and place them in a ball mill. Take it out after ball milling for 10 hours, add 5g of glucose, and under the protection of nitrogen, raise the temperature to 600°C at a heating rate of 3°C / min for 5h, and after cooling, a completely dispersed graphite negative electrode material with a multi-phase structure is obtained;

[0038] The multi-phase structure graphite negative electrode material is pressed on the current collector to make the negative electrode plate.

[0039] Then use spinel lithium manganese oxide as the active material, after mixing and coating the positive and negative active materials, rolling, slitting, lamination or winding, packaging, liq...

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Abstract

The invention relates to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery using graphite having a multiphase structure as a negative pole material. According to the invention, thin layer graphite and a conventional graphite material are mixed and then are subjected to secondary thermal treatment so as to obtain the graphite having the multiphase structure as the negative pole material of the lithium ion battery; the preparation process of the negative pole material is simple and easy to operate; the advantages of two materials (namely thin layergraphite and conventional graphite material) are integrated to the obtained negative pole material, the properties of the two materials are promoted mutually, and the electrochemical property of the obtained negative pole material is good; and especially, when being used in the field of lithium ion batteries, the obtained negative pole material has the advantages of large specific capacity and good power and cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery using graphite with a multiphase structure as a negative electrode material. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles, power tools, and energy storage. With the continuous innovation of its application fields, people have higher and higher requirements for the power performance, capacity performance and cycle performance of lithium-ion batteries. Therefore, researchers have developed a series of new non-carbon-based negative electrode materials, such as silicon, tin and metal oxides; although these new materials have high capacity, they also bring about the problem of large volume expansion. The progress of the first charge and discharge cycle will eventually lead to the pulverization of the material and lose its use value. [0003] At present, carbon materials are still the first choice for lith...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/133
CPCY02E60/122Y02E60/10
Inventor 杨全红苏方远魏伟陈学成李中延罗永莉张新河马莉刘东
Owner MCNAIR TECH
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