Lithium ion cell nano complex electrode material and its preparing method

A lithium-ion battery and nanocomposite technology, applied in the field of electrochemistry, can solve the problems of insufficient mixing of Ti and LiF, large internal resistance of electrochemical reaction, small reversible specific capacity, etc. The effect of excellent performance and high specific capacity

Inactive Publication Date: 2005-02-16
FUDAN UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We believe that the insufficient mixing of Ti and LiF in this system or the large particle size of each component (greater than 100nm) caused the internal resistance of the electrochemical reaction in the reaction system to be too large, so that the reversible specific capacity was too small

Method used

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  • Lithium ion cell nano complex electrode material and its preparing method
  • Lithium ion cell nano complex electrode material and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put chemically pure LiF and Co powder with a molar ratio of 1:0.5 in a ball mill for 3 hours to mix LiF and Co powder thoroughly; then press the mixture powder into a target material for radio frequency magnetron sputtering A composite nano-mixture electrode thin film material was prepared by the method of irradiation. The sputtering condition is: the background pressure is 1×10 -4 Pa, the distance from the target to the substrate is 7cm, the target should be pre-sputtered for 30min before depositing the film, the sputtering atmosphere is pure argon, the flow rate is 50sccm, the working pressure is 1.5Pa, and the radio frequency power is 100W. During deposition, the substrate temperature is less than 150° C., and the deposition time is 1 hour. The particle size in the deposited film is about 10nm (attached figure 1 ), indicating that the deposited film is LiF / Co 0.5 composed of nanocomposite materials. Although, it is inevitable that there will also be CoF during th...

Embodiment 2

[0017] Put chemically pure LiF and Ni powder (excessive Ni powder) with a molar ratio of 1:0.6 in a ball mill for 3 hours to fully mix LiF and Ni powder; then press the mixture powder into a target material for radio frequency magnetron sputtering, The nanocomposite electrode thin film material is prepared by radio frequency magnetron sputtering. The sputtering condition is that the background pressure is 1×10 -4 Pa, the distance from the target to the substrate is 5cm, the argon flow rate is 45sccm, the working pressure is 3Pa, the radio frequency power is 30W, and the rest are the same as in Example 1. LiF / Ni deposited on a stainless steel substrate 0.6 The nanocomposite film is used as the working electrode, and the high-purity lithium sheet is used as the counter electrode to assemble a simulated battery. Battery assembly and testing are the same as in Example 1. The hybrid thin film electrode showed good electrochemical performance. The charging and discharging voltag...

Embodiment 3

[0019] Put chemically pure LiF and metal Fe powder with a molar ratio of 1:0.55 (excessive metal Fe powder) in a ball mill for 3 hours to fully mix LiF and metal Fe powder; then press the mixture powder into radio frequency magnetron sputtering The target material is prepared into a nanocomposite electrode film material by radio frequency magnetron sputtering. The sputtering condition is that the background pressure is 1×10 -4 Pa, the distance from the target to the substrate is 8cm, the argon flow rate is 55sccm, the working pressure is 0.5Pa, the radio frequency power is 80W, and the rest are the same as in Example 1. LiF / Fe deposited on stainless steel substrate 0.55 The nanocomposite film is used as the working electrode, and the high-purity lithium sheet is used as the counter electrode to assemble a simulated battery. Battery assembly and testing are the same as in Example 1. The hybrid thin film electrode showed good electrochemical performance. The charging and dis...

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Abstract

The Nano composition is composed of LiF and a transition metal M (such as Co, Ni, Fe or Ag etc.) obtained through magnetron sputtering method in radio frequency. Grain size of LiF and the transition metal M is less than 50nm. Specific capacity of membrane electrode is changed in range 100-450mAh / g dependent on transition metal. Features are: favorable stability in procedures of repeating charges and discharges, high specific capacity and easy of preparation, suitable to thin membrane lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a nanometer size composite electrode active material which can be used in lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have attracted great attention due to their advantages such as high operating voltage and high energy density. At present, lithium-ion batteries have been widely used in electronic equipment such as mobile phones, notebook computers, and cameras, and may be used in automobiles and other vehicles as green energy. Commonly used cathode materials for lithium-ion batteries are LiCoO 2 , LiNiO 2 and LiMn 2 o 4 Wait. Although this type of cathode material has good electrochemical performance, its better development is limited by factors such as high price, low specific capacity, and complicated preparation and purification processes. Especially the problem of low specific capacity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35H01M4/36H01M4/38H01M4/58
CPCY02E60/10
Inventor 刘文元傅正文秦启宗
Owner FUDAN UNIV
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