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Method for preparing a carbon cathode material of lithium ion battery

A carbon negative electrode material and lithium-ion battery technology, which is applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of complex process, cumbersome operation, and high cost, and achieve simple and convenient recycling, low cost, and improved conductivity or storage. The effect of lithium capacity

Inactive Publication Date: 2006-10-04
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the defects of complex process, cumbersome operation, large pollution and high cost in the prior art, so as to provide a green and environmentally friendly process with simple operation, high initial charge and discharge efficiency, high reversible specific capacity and stable Preparation method of lithium ion carbon negative electrode material with cycle performance

Method used

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  • Method for preparing a carbon cathode material of lithium ion battery
  • Method for preparing a carbon cathode material of lithium ion battery
  • Method for preparing a carbon cathode material of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Dissolve 10g of polyacrylamide in 200ml of deionized water, add 100g of spherical natural graphite, heat up to 80°C and stir for 6 hours, then evaporate the water to dryness, and then put it in an oven at 120°C for 6 hours to cure. Place the obtained precursor in an alumina crucible, put it into a high-temperature resistance furnace, and raise it to 500°C at 10°C / min under nitrogen protection, keep the temperature constant for 0.5 hours, then raise it to 900°C at 10°C / min, and keep the temperature constant for 4 hours . The carbon negative electrode material and the lithium counter electrode were assembled into a button battery. The reversible specific capacity is 328.9mAh / g, and the first charge and discharge efficiency is 93.5%.

Embodiment 2

[0044] The preparation method is the same as in Example 1, except that 2 g of acetylene black is added. The carbon negative electrode material and the lithium counter electrode are assembled into a 063048A lithium ion battery.

[0045] image 3 According to the battery performance testing cycle graph obtained in this example, the reversible specific capacity is 340.8mAh / g, and the first charge and discharge efficiency is 92.3%.

Embodiment 3

[0047] Dissolve 15g of polyacrylamide in 200ml of deionized water, add 0.2g of carbon nanotubes and 100g of spherical natural graphite, heat up to 70°C and stir for 6 hours, then evaporate the water to dryness, and then put it in an oven at 90°C for 9 hours to cure. Place the obtained precursor in an alumina crucible, put it into a high-temperature resistance furnace, and raise it to 400°C at 5°C / min under the protection of argon, keep the temperature constant for 1 hour, then rise to 900°C at 5°C / min, and keep the temperature for 3 Hour. The carbon negative electrode material and the lithium counter electrode were assembled into a button battery. Its reversible specific capacity is 380.7mAh / g, and the first charge and discharge efficiency is 80.8%.

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Abstract

The invention is a method of preparing carbon cathode material of lithium ion cell, including the following steps: dissolving water-soluble high-molecular polymer or water-soluble organic compound in water, proportionally adding in additive and graphite powder, blending uniformly in a mixer, raising temperature to evaporate the water and simultaneously keeping blending to make particles, then placing them in the hot air for hardening, then putting in a protective-gas high temperature furnace for carbonizing, cooling to the room temperature, and obtaining a shell-core structural compound graphite material. The invention is simple and easy to apply, green and environmental-protection, and easy to industrially produce. The modified graphite has high primary charge-discharge efficiency, high reversible specific capacity and good circulating property.

Description

【Technical field】 [0001] The invention relates to the technical field of storage battery electrode materials, in particular to a preparation method of a carbon negative electrode material for a lithium ion secondary battery. 【Background technique】 [0002] As a new type of green energy, lithium-ion batteries have the advantages of high voltage, long life, and high energy density compared with traditional nickel-hydrogen-nickel-cadmium batteries. However, they also have the disadvantage of poor fast charge and discharge performance. The anode material used has a lot to do with it. [0003] The negative electrode material in lithium-ion batteries is generally carbon materials, such as graphite, coke, pyrolytic carbon, etc. Natural graphite has a high specific capacity, but poor compatibility with the electrolyte, the first cycle coulombic efficiency is low, and the graphite layer peels off due to the expansion and contraction of the graphite layer during charge and discharge,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/58C01B31/02
CPCY02E60/10
Inventor 沈菊林王传福董俊卿
Owner BYD CO LTD
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