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A kind of preparation method of lithium-ion battery negative electrode material GEC nanosphere

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology, secondary batteries, etc., can solve the problems of volume expansion, cycle performance reduction, and mechanical pulverization of pure Ge negative electrode materials, and achieve good cycle performance and high Specific capacity value, effect of preventing agglomeration

Inactive Publication Date: 2016-01-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure Ge anode materials are prone to severe volume expansion and mechanical pulverization during the process of delithiation and lithium intercalation, which lead to their detachment from the electrode surface during use, resulting in severe capacity fading and significantly reduced cycle performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take GeO according to the quantity of 1:2:10:0.2 parts by mass 2 , catechol, water and sodium hydroxide, after mixing uniformly, magnetically stirred for 1 hour to obtain a Ge-catechol complex solution. According to the quantity of ammonia water: water: ethanol = 1:100:20 parts by mass, after mixing evenly, add Ge-catechol complex solution, the mass ratio of Ge-catechol complex solution to ethanol is 0.2. Then add resorcinol and formaldehyde solution, wherein, the quality of resorcinol is 3 times of the quality of catechol; A polymer of Ge nanoparticles, the polymer is hydrothermally reacted at 80° C. for 24 hours to obtain Ge polymer nanospheres. After the obtained Ge polymer nanospheres were dried, they were placed in a tube furnace in an argon atmosphere at 1.0 °C min -1 The heating rate was increased from room temperature to 700 °C for carbonization to obtain GeC nanospheres.

Embodiment 2

[0019] Take GeO according to the quantity of 1:3:20:0.3 parts by mass 2 , catechol, water and sodium hydroxide, after mixing uniformly, magnetically stirred for 1 hour to obtain a Ge-catechol complex solution. According to the amount of ammonia water: water: ethanol = 1:160:30 parts by mass, after mixing evenly, add Ge-catechol complex solution, wherein, the mass ratio of Ge-catechol complex solution to ethanol is 0.3 . Then add resorcinol and formaldehyde solution, wherein, the quality of resorcinol is 3.3 times of the quality of catechol; A polymer of Ge nanoparticles, the polymer is hydrothermally reacted at 90° C. for 24 hours to obtain Ge polymer nanospheres. After the obtained Ge polymer nanospheres were dried, they were placed in a tube furnace in an argon atmosphere at 3.0 °C min -1 The heating rate was increased from room temperature to 750 °C for carbonization to obtain GeC nanospheres.

Embodiment 3

[0021] Take GeO according to the quantity of 1:4:30:0.4 parts by mass 2 , catechol, water and sodium hydroxide, after mixing uniformly, magnetically stirred for 1 hour to obtain a Ge-catechol complex solution. According to ammonia water: water: ethanol = 1: 220: 40 parts by mass, after mixing evenly, add Ge-catechol complex solution, wherein, the mass ratio of Ge-catechol complex solution to ethanol is 0.4 . Then add resorcinol and formaldehyde solution, wherein, the quality of resorcinol is 3.7 times of the quality of catechol; A polymer of Ge nanoparticles, the polymer is hydrothermally reacted at 100° C. for 24 hours to obtain Ge polymer nanospheres. After the obtained Ge polymer nanospheres were dried, they were placed in a tube furnace in an argon atmosphere at 5.0 °C min -1 The heating rate was increased from room temperature to 780°C for carbonization to obtain GeC nanospheres.

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Abstract

The invention relates to a preparation method of lithium ion battery negative electrode material Ge-C nanosphere. The preparation method is as follows: first reacting GeO2 with catechol in an alkaline solution to obtain a Ge-catechol complex solution; uniformly dispersing the Ge-catechol complex solution in an ethanol / water / ammonia system, then adding resorcinol and formaldehyde, reacting for 24h at 20-35 DEG C to obtain a polymer containing Ge nanoparticles; performing hydro-thermal treatment on the polymer containing the Ge nanoparticles for 24h at 80-120 DEG C, after drying, in argon atmosphere, heating from room temperature to 700-800 DEG C in the heating rate of 1.0-10 DEG C per min for carbonization to obtain the Ge-C nanosphere. The preparation method is simple in process, the obtained Ge-C nanosphere as a lithium ion battery negative electrode material can show high specific capacity value and good stable cycle use life, during charging and discharging at 0.1C multiplying power, the first charge capacity is 800-1430m A. h .g <-1>, and after 100 times of cyclic charging and discharging, the capacity retention ratio is 60-86%.

Description

technical field [0001] The invention relates to a method for preparing GeC nanospheres, which are negative electrode materials for lithium ion batteries, and belong to the technical field of preparation of negative electrode materials for lithium ion batteries. Background technique [0002] Lithium-ion batteries have become the focus of new energy materials in recent years due to their advantages such as high energy density, small self-discharge, long cycle life, low environmental pollution, and no memory effect. Electric vehicles, satellites, aerospace and national defense and other fields have important application prospects. The role of lithium-ion battery anode materials in the working process is to intercalate and delithiate lithium. Therefore, the research and application of high-capacity anode materials has become the key to improving the performance of lithium-ion batteries. In recent years, the research on lithium-ion battery anode materials has been reported in ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36B82Y40/00
CPCB82Y40/00H01M4/362H01M10/0525Y02E60/10
Inventor 马晓梅刘明贤甘礼华
Owner TONGJI UNIV