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Anode material for lithium-ion battery and negative plate of anode material

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor battery cycle performance, achieve high rate performance, simple and easy preparation methods, and improve cycle life effects.

Active Publication Date: 2016-03-30
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium ion battery negative electrode material with good cycle performance and high cycle life in order to solve the defect that the existing lithium ion battery negative electrode material uses natural graphite to make the battery cycle performance poor.

Method used

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  • Anode material for lithium-ion battery and negative plate of anode material

Examples

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Effect test

Embodiment 1

[0027] Coating treatment of natural graphite: Dissolve 950g of natural graphite and 50g of soft carbon in ethanol, mix and stir for 6h at a speed of 300r / min, filter, dry at 100°C for 13h, and mix the dried The powder was put into a muffle furnace under the protection of nitrogen and roasted at 375°C for 4 hours, and then cooled naturally to obtain soft carbon-coated natural graphite powder.

[0028] Preparation of negative electrode slurry: Dissolve 20g of sodium carboxymethylcellulose CMC in 1518g of deionized water, stir and disperse for 5 hours to obtain a CMC glue with a solid content of 1.3%, then add 15g of conductive carbon black and 15g of carbon nanofibers Stir and disperse in the CMC glue solution for 1 hour, then add 920g of additives, artificial graphite and soft carbon-coated natural graphite powder in 2 times on average, the amount added each time is 1 / 2 of the total amount, and the time interval between additions is 0.5h After stirring at high speed for 2 hours...

Embodiment 2

[0032] Coating treatment of natural graphite: Dissolve 980g of natural graphite and 20g of soft carbon in ethanol, mix and stir for 12h at a speed of 100r / min, filter, dry at 80°C for 16h, and mix the dried The powder was put into a muffle furnace under the protection of nitrogen and roasted at 400°C for 6h, and then cooled naturally to obtain soft carbon-coated natural graphite powder.

[0033] Preparation of negative electrode slurry: Dissolve 10g of sodium carboxymethylcellulose CMC in 1630g of deionized water, stir and disperse for 3 hours to obtain a CMC glue with a solid content of 1.2%, then add 5g of conductive carbon black and 5g of carbon nanofibers Stir and disperse in the CMC glue solution for 1.5h, and then add 960g of additives, artificial graphite and soft carbon-coated natural graphite powder in 3 times on average. The amount added each time is 1 / 3 of the total amount, and the adding time interval is 0.6 h, after stirring at high speed for 3 hours, add 30g styr...

Embodiment 3

[0037] Coating treatment of natural graphite: Dissolve 880g of natural graphite and 120g of soft carbon in ethanol, mix and stir for 4h at a speed of 500r / min, then filter, dry at 120°C for 12h, and mix the dried The powder was put into a muffle furnace under the protection of nitrogen and roasted at 250°C for 10 hours, and then cooled naturally to obtain soft carbon-coated natural graphite powder.

[0038]Preparation of negative electrode slurry: Dissolve 30g of carboxymethylcellulose sodium CMC in 2120g of deionized water, stir and disperse for 4 hours to obtain a CMC glue with a solid content of 1.5%, then add 10g of conductive carbon black and 10g of Ketjen black Stir and disperse in the CMC glue solution for 1 hour, then add 870g of additives, artificial graphite and soft carbon-coated natural graphite powder in 5 times on average, the amount added each time is 1 / 5 of the total amount, and the time interval between additions is 0.8h After 4 hours of high-speed stirring, 2...

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Abstract

The invention discloses an anode material for a lithium-ion battery and a negative plate of the anode material. The anode material is formed by mixing soft carbon-coated natural graphite and synthetic graphite at a certain mass ratio; and the preparation method comprises the following steps: dissolving the natural graphite and soft carbon at the certain mass ratio into an organic solvent; filtering and drying the organic solvent after long-term mixing and stirring, putting the dried mixed powder into a muffle furnace filled with nitrogen for protection, carrying out low-temperature roasting, and then naturally cooling the dried mixed powder to obtain soft carbon-coated natural graphite powder; and mixing the coated natural graphite and the synthetic graphite in a negative electrode pulping process at the certain mass ratio. According to the anode material prepared by the method, the cycle performance is greatly improved under the premise of ensuring a high specific capacity; and the energy density and the cycle lifetime of the lithium-ion battery are ensured.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery negative electrode material with good cycle performance and long cycle life and the negative electrode sheet thereof. Background technique [0002] With the rapid development of electric vehicles and hybrid electric vehicles, there is a demand for power lithium-ion batteries with higher power density and energy density, suitable for fast charging and discharging, and energy-type lithium-ion batteries with longer battery life. very urgent. [0003] With the development of the lithium-ion battery industry, the application of lithium-ion batteries is becoming more and more widespread, and the market's requirements for lithium-ion batteries are also getting higher and higher, especially for the energy density of lithium-ion batteries. Today, electric vehicle technology is becoming more and more perfect. Lithium-ion power batteries not only require high ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/38H01M4/62
CPCY02E60/10
Inventor 周伟瑛吕豪杰
Owner WANXIANG 123 CO LTD
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