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High safety performance lithium ion cell and preparing method thereof

A technology of lithium ion battery and safety performance, applied in the field of electrochemistry, can solve the problems of deterioration of rate charge and discharge performance of lithium ion battery, reduction of ionic conductivity of electrolyte, etc., and achieve the effects of improved safety performance and simple preparation method

Inactive Publication Date: 2007-04-18
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the above method can improve the safety performance of lithium-ion batteries, after adding flame-retardant additives, the ionic conductivity of the electrolyte is reduced, and the rate charge and discharge performance of the prepared lithium-ion batteries is deteriorated, so further improvement is necessary

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] LiCoO 2 , Li[Co 1 / 3 Ni 1 / 3 mn 1 / 3 ] and LiZn 0.01 Fe 0.99 PO 4 Mix uniformly in a ball mill at a mass ratio of 0.1:100:20 to be used as a positive electrode material. Lithium-ion batteries were prepared according to conventional methods. Then, an overcharge test was carried out at an overcharge voltage of 20V, and the results are shown in Table 1. It was found that when overcharged, no fire phenomenon occurred.

Embodiment 2

[0032] The mass ratio of the materials in Example 1 was changed to 50:50:10, and other conditions were the same as in Example 1. Lithium-ion batteries were prepared according to conventional methods. Then, an overcharge test was carried out at an overcharge voltage of 20V, and the results are shown in Table 1. It was found that when overcharged, no fire phenomenon occurred.

Embodiment 3

[0034] LiMn 2 o 4 , Li[Al 1 / 12 co 1 / 4 Ni 1 / 3 mn 1 / 3 ] and LiFePO 4 Mix uniformly in a three-dimensional mixer at a mass ratio of 100:100:10 to be used as a positive electrode material. Lithium-ion batteries were prepared according to conventional methods. Then, an overcharge test was carried out at an overcharge voltage of 20V, and the results are shown in Table 1. It was found that when overcharged, no fire phenomenon occurred.

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PUM

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Abstract

The invention belongs to electrochemical technical field, concretely a high safety Li ion battery and the preparing method thereof, where anode material of the Li ion battery comprises routine anode materials, ternary anode mateiral and Li Fe phosphite, and the Li ion battery is made by routine process. And the making method of the Li ion battery is simple, very easy to implement, having wide raw material sources, and low-cost. And the made Li ion battery has advantages of good overcharge resistance, etc. And it can be used as power supply to various small-power delectronic devices and large-power electric driven tools.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a lithium-ion battery with high safety performance and a preparation method thereof. Background technique [0002] As we all know, there are certain safety problems in lithium-ion batteries at present. If the manufacturing industry or conditions are not strictly controlled, safety accidents will occur. What attracted the most attention in 2006 was the large-scale recall of lithium-ion batteries for notebook computers made by Japan's Sony Corporation, which caught fire and caused great losses, with the cost of the recall reaching 3 billion US dollars. In order to improve the safety performance of lithium-ion batteries, the main method at present is to add flame-retardant additives in the electrolyte (see Wu Yuping, "Lithium-ion Batteries-Application and Practice" Chapter 9, "Non-aqueous Liquid Electrolyte", 2004 Year, Beijing, published by Chemical Industry P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01D15/00C01G1/02H01M10/04H01M10/40H01M4/505H01M4/525H01M10/0525
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 张汉平吴宇平吴浩青
Owner FUDAN UNIV
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