Lithium ion battery composite cathode material and preparation method

A technology for lithium ion batteries and negative electrode materials, which is applied in electrode manufacturing, battery electrodes, active material electrodes, etc., can solve the problems of limiting the application of hard carbon-coated spherical natural graphite, unable to achieve commercial use, etc., and achieve good cycle performance and cost. low, reduce the effect of reducing

Inactive Publication Date: 2009-12-16
珠海华丽新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The usual method used at present is the carbon coating method. People such as Yu Shiang Wu reported on the 2006 Journal of Alloys and Compounds 426: 218-222 that the natural graphite was coated with the hard carbon of phenolic resin. They solved it very well. However, in their preparation process, no additives cont

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 10g of spherical natural graphite, the mass of phenolic resin is 15% of spherical natural graphite, the mass of phosphoric acid is 35% of the mass of phenolic resin, dissolve the phenolic resin in ethanol, add phosphoric acid and stir evenly, add spherical natural graphite, keep stirring at a constant temperature of 50°C for 1h , stand still for 1h, filter the filter cake, and dry the filter cake under vacuum at 80°C for later use. put into the heating furnace, in N 2 Under protection, rise to 600°C at 1°C / min, keep warm for 0.5h, and cool naturally to room temperature to obtain a lithium-ion battery composite negative electrode material.

Embodiment 2

[0020] Weigh 40g of spherical natural graphite, the quality of the furan resin is 12.5% ​​of the spherical natural graphite, dissolve the furan resin in ethanol, add boric acid with a mass of 20% of the furan resin, stir evenly, add spherical natural graphite, and continue stirring at a constant temperature of 90°C for 4h. Stand still for 4 hours, filter the filter cake, and dry the filter cake under vacuum at 120°C for future use. Put it into a heating furnace, under the protection of Ar, raise the temperature to 1300°C at a rate of 10°C / min and keep it for 3h, then cool it down to room temperature naturally to obtain a lithium-ion battery composite negative electrode material.

Embodiment 3

[0022] Take by weighing 30g spherical natural graphite, epoxy resin quality is 10% of spherical natural graphite, epoxy resin is dissolved in ethanol, add diboron trioxide quality is 25% of epoxy resin, after stirring, add spherical natural graphite, constant temperature Continue to stir at 85°C for 2 hours, stand still for 3 hours, filter the filter cake, dry the filter cake under vacuum at 90°C for later use, put it in a heating furnace, and under the protection of Ar, heat it up to 750°C at a speed of 5°C / min and keep it for 3 hours. Cool to room temperature to obtain a lithium-ion battery composite negative electrode material.

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PUM

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Abstract

The invention relates to a lithium ion battery composite cathode material and a preparation method. The cathode material comprises a hard carbon precursor material containing hetero atoms, and natural spherical graphite, wherein the hard carbon precursor material selects one or more than two of phenolic resin, polyfurfural, furan resin, polyvinyl alcohol, epoxide resin or polyacrylonitrile as raw materials, and accounts for 5 to 45 percent of the natural spherical graphite by mass; modifier of the hetero atoms is boron-containing modifier including boric acid and diboron trioxide, phosphor-containing modifier including phosphoric acid and phosphorus pentoxide, and nitrogen-containing modifier HNO3; and one of the modifiers accounts for 5 to 35 percent of the hard carbon precursor by mass. An analog battery formed by the cathode material which is prepared by the method has the capacity over 350 mAH/g and first coulomb efficiency up to 95.8 percent, and has good circulation performance. The preparation method has the advantages of low cost and simple process.

Description

technical field [0001] The invention relates to a lithium ion battery composite negative electrode material and a preparation method. Background technique [0002] Lithium-ion batteries have high energy density, high open circuit voltage, and good safety performance. Because lithium-ion batteries have these advantages, lithium-ion batteries have been widely concerned by people since they came out. The electrode materials of lithium-ion batteries that people are studying now include metal oxides and carbon materials. Among them, carbon materials have a low voltage platform, high specific capacity, and especially low cost. These advantages have expanded the application of carbon materials in lithium-ion battery electrodes. However, it has poor compatibility with the electrolyte, and it is easy for solvated molecules to enter the graphite layer during charging, causing the graphite layer to peel off, and the electrolyte and the graphite layer continue to react, resulting in p...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/62H01M4/04
CPCY02E60/12Y02E60/10
Inventor 李再志康书文王钊
Owner 珠海华丽新能源科技有限公司
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