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Lithium ion battery anode material LiFe(1-x)(II)MxSO4F and fused salt ion heat preparation method

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of expensive EMI-TESI and achieve the effects of easy purification, simple system, and low synthesis temperature

Active Publication Date: 2011-09-21
江苏省新动力电池及其材料工程技术研究中心有限公司 +1
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AI Technical Summary

Problems solved by technology

The synthesized compound has higher conductivity than LiFePO 4 Three orders of magnitude higher, without carbon coating, electrochemical capacity of 130-140mAh / g, excellent cycle reversibility, but the EMI-TESI used in the preparation is expensive

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] 1. Weigh 1.70g FeSO 4 ·H 2 O fine powder and 0.30g LiF fine powder 2.00g NaNO 3 and 1.00gNH 4 Mix fine powder of HF, grind it evenly, place it in a polytetrafluoroethylene-lined stainless steel autoclave, seal it in an oven, keep the temperature at 250°C for 8 hours, and cool the melt. Wash three times with 30 mL of 50%-80% ethanol each time, and then wash twice with absolute ethanol, and the product is vacuum-dried to obtain a gray powder. The XRD test analysis shows that it is a triclinic crystal system and belongs to the P-1 space group, which is consistent with the results of N.Recham. Its chemical formula is LiFeSO 4 F.

[0014] 2. Weigh 1.73gCoSO 4 ·H 2 O fine powder, 0.30g LiF fine powder, 2.00g NaNO 3 and 1.00gNH 4 Mix fine powder of HF, grind it evenly, place it in a polytetrafluoroethylene-lined stainless steel autoclave and seal it in an oven at a constant temperature of 250°C for 8 hours, and cool the melt. Wash three times with 30 mL of 50%-80% et...

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PUM

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Abstract

The invention provides a lithium ion battery anode material LiFe1-x (II) MxSO4F, wherein, X is more than or equal to 0 and is less than or equal to 1, M is an oxidation state, and is the ions of Ni and Co of II transitional metal. The invention also provides a preparation method of the above lithium ion battery anode material, comprising the following steps: fully mixing monohydrate sulphate comprising Fe, Co and Ni, LiF and NaNO3-NH4F.HF; enclosing and melting for 4-8 hours at the temperature of 220-250 DEG C; and washing the fuse element by utilizing an ethanol water solution to prepare into a battery anode material LiFe1-x (II) MxSO4F. The material belongs to a triclinic system, and a P-1 space group, and is used for preparing a test battery according to a LiCoO2 material; the electro chemical property of the test battery is tested; the platform voltage is 3.6V, and 0.1C charge-discharge circulates for 20 times; and the average capacity is 140-145mAh / g.

Description

【Technical field】 [0001] The invention relates to a positive electrode material of a rechargeable lithium ion battery and a molten salt ion thermal preparation method thereof. Its material overcomes LiFePO 4 The disadvantage of poor conductivity, the preparation method is mild, environmentally friendly, and suitable for large-scale production. 【Background technique】 [0002] Since the commercialization of lithium-ion batteries, they have undergone continuous improvement and creation process, especially the positive electrode material as a key part: from LiCoO 2 To LiCoxNiyMnzO 2 (x+y+z=1) to LiFePO 4 , these materials have their own characteristics, but they are also subject to different restrictions. Such as resources, prices, environmental protection, safety, etc., among which LiFePO 4 It has poor electrical conductivity (low electron ion mobility), and it must be nano-sized or coated with carbon before it can be used in practice, which increases the complexity and co...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/136H01M4/58C01B25/45
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 沈晓彦唐琛明陈东缪卫东
Owner 江苏省新动力电池及其材料工程技术研究中心有限公司
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