Method for synthesizing lithium ion battery negative electrode material according to mechanochemical method

A technology of lithium ion battery and mechanochemical method, which is applied in the field of graphene-metal oxide nanocomposite materials, can solve the problems of unfavorable industrial application, complex synthesis process, and high condition requirements, and achieve good electrochemical performance, uniform distribution of elements, The effect of low firing temperature

Active Publication Date: 2014-02-26
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, most methods for synthesizing graphene-metal oxide nanocomposites are hydrothermal synthesis, which is complicated in synthesis process and requires high conditions, which is not conducive to industrial application.

Method used

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  • Method for synthesizing lithium ion battery negative electrode material according to mechanochemical method
  • Method for synthesizing lithium ion battery negative electrode material according to mechanochemical method
  • Method for synthesizing lithium ion battery negative electrode material according to mechanochemical method

Examples

Experimental program
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Effect test

Embodiment example 1

[0021] Implementation Case 1: SnO 2 / Graphene synthesis, structural stability test and electrochemical performance test of simulated battery assembled with Li.

[0022] Add Sn powder and graphite oxide powder (prepared by Hammers method) into an 80ml stainless steel ball mill tank filled with zirconia balls at a mass ratio of 1:1, use deionized water as the grinding medium, and argon as the protective gas, at 400rpm Ball milling at a rotating speed for 8 hours, after which, the sample was dried naturally and baked at 300°C for 1 hour under the protection of argon at a rate of 5°C / min to obtain the desired SnO 2 / graphene composites.

[0023] The XRD powder diffraction method showed that SnO was generated 2 ,like figure 1 Shown is SnO 2 / XRD phase structure of graphene, from figure 1 It can be seen that the position of each diffraction peak in the XRD pattern of the synthesized product is related to that of the SnO 2 The standard JCPDS card (41-1445) agrees with that, in...

Embodiment example 2

[0025] Implementation Case 2: Fe 3 o 4 / Graphene synthesis, structural stability test and electrochemical performance test of simulated battery assembled with Li.

[0026] Fe powder and graphite oxide powder (prepared by Hammers method) were added to an 80ml stainless steel ball mill tank filled with zirconia balls at a mass ratio of 1:1, with deionized water as the grinding medium and argon as the protective gas, at 200rpm After ball milling at a rotational speed for 6 hours, the sample was naturally dried and calcined at 450°C for 2 hours under an argon atmosphere at a rate of 10°C / min to obtain the desired composite material. Figure 5 The XRD powder diffraction method measurement shown shows that the prepared composite material Fe 3 o 4 structure.

[0027] The prepared sample was evenly mixed with superconducting carbon black (Super P) and PVDF according to the ratio of 8:1:1, and NMP was used as the solvent. After mixing evenly, it was coated on a copper foil with a t...

Embodiment example 3

[0028] Implementation Case 3: Cu 2 Synthesis of O / graphene, structural stability test and electrochemical performance test of simulated battery assembled with Li.

[0029] Add Cu powder and graphite oxide powder (prepared by Hammers method) into an 80ml stainless steel ball mill jar filled with zirconia balls at a mass ratio of 2:1, use absolute ethanol as the grinding medium, and nitrogen gas as the protective gas, at 300rpm Ball milled at a rotating speed for 4 hours. Afterwards, the sample was dried naturally and baked at 350°C for 3 hours under the protection of nitrogen gas at a rate of 10°C / min to obtain the desired Cu 2 O / graphene composites. Figure 7 The XRD powder diffraction method measurement shown shows that the prepared composite material Cu 2 O structure.

[0030] The prepared sample was evenly mixed with superconducting carbon black (Super P) and PVDF according to the ratio of 8:1:1, and NMP was used as the solvent. After mixing evenly, it was coated on a co...

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Abstract

The invention provides a method for synthesizing a lithium ion battery negative electrode material according to a mechanochemical method. The method comprises the following steps of proportioning raw materials in a certain mass ratio, wherein the raw materials include graphite oxide and relatively cheap micron-sized metal powder; carrying out wet ball milling to obtain slurry; naturally drying the slurry; and roasting at medium and low temperature for a short time, thus obtaining the negative electrode material. The method is simple in process, meets the environment requirement, and can be applied to industrial production. According to the prepared negative electrode material, nano-sized particles, high metallic oxide load and good properties can be achieved, and the prepared material is suitable for being used as the battery negative electrode material.

Description

technical field [0001] The invention relates to a method for synthesizing a negative electrode material of a lithium ion battery by using a mechanochemical method, in particular to a method for a graphene-metal oxide nanocomposite material, which belongs to the field of lithium ion battery material technology. Background technique [0002] Lithium-ion secondary batteries have been successfully used in portable electronic devices as a new energy storage tool in the past 10 years. Energy and environmental issues have very important practical significance. [0003] Due to the advantages of high theoretical capacity, environmental friendliness, and low preparation cost, metal oxide nanoparticles have attracted widespread attention and become a research hotspot of lithium-ion secondary battery anode materials. However, the volume change of metal oxides is very obvious during the charging and discharging process, which leads to the stripping of the active material from the curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62B82Y30/00
CPCB82Y40/00H01M4/362H01M4/483H01M4/502H01M4/523H01M4/625H01M10/0525Y02E60/10
Inventor 邵宗平叶飞赵伯特蔡锐冉然
Owner NANJING UNIV OF TECH
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