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Low-temperature lithium iron phosphate and its preparation method and application

A lithium iron phosphate, low temperature technology, applied in positive electrodes, active material electrodes, structural parts, etc., can solve problems such as poor low temperature performance, and achieve the effects of improving ionic conductivity, reducing side reactions, and reducing interface polarization effects.

Active Publication Date: 2022-04-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] LiFePO 4 Synthetic raw materials are rich in resources, low in cost, friendly to the environment, high in capacity and good in cycle performance, but their low temperature performance is poor

Method used

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  • Low-temperature lithium iron phosphate and its preparation method and application
  • Low-temperature lithium iron phosphate and its preparation method and application
  • Low-temperature lithium iron phosphate and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment provides a method for preparing low-temperature lithium iron phosphate, comprising the following steps:

[0039] S1. Preparation of CuInS 2 Layer-coated lithium iron phosphate film; ball mill the lithium iron phosphate powder material at a speed of 3000-3500r / min for 20h-22h, add it to deionized water, and add non-ionic dispersant Tween-80 at the same time, in a water bath at 40°C After stirring for 8 hours, a lithium iron phosphate dispersion was obtained, and the Tween-80 mass proportion in the lithium iron phosphate dispersion was 5%.

[0040] 1.5gCu 2 SO 4 ·5H 2 O, 2.5gIn(NO 3 ) 3 4.5H 2 O and 1gCH 3 CSNH 2 (Thioacetamide) was uniformly mixed in 14g deionized water to obtain a mixed solution. This mixed solution was mixed with a lithium iron phosphate dispersion to obtain a slurry.

[0041] The slurry is printed and sprayed onto a single crystal silicon substrate to obtain a wet film of 0.4 μm-0.5 μm, and dried at 100° C. to obtain a precur...

Embodiment 2

[0047] This embodiment provides a method for preparing low-temperature lithium iron phosphate, comprising the following steps:

[0048] S1. Preparation of CuInS 2 Layer-coated lithium iron phosphate film; ball mill the lithium iron phosphate powder material at a speed of 3500r / min for 22h, add it to deionized water, add non-ionic dispersant Tween-80 at the same time, stir in a water bath at 60°C for 10h, and obtain Lithium iron phosphate dispersion liquid, the mass proportion of Tween-80 in the lithium iron phosphate dispersion liquid is 35%.

[0049] 1.5gCu 2 SO 4 ·5H 2 O, 2.5gIn(NO 3 ) 3 4.5H 2 O and 1gCH 3 CSNH 2 Mix evenly with 14 g of deionized water to obtain a mixed solution. This mixed solution was mixed with a lithium iron phosphate dispersion to obtain a slurry.

[0050] The slurry was printed and sprayed onto a single crystal silicon substrate to obtain a 2 μm wet film, and dried at 120° C. to obtain a precursor thin film. Put the precursor film into a se...

Embodiment 3

[0056] This embodiment provides a method for preparing low-temperature lithium iron phosphate, comprising the following steps:

[0057] S1. Preparation of CuInS 2 Layer-coated lithium iron phosphate film; ball mill the lithium iron phosphate powder material at a speed of 3000-3500r / min for 22 hours, add it to deionized water, add non-ionic dispersant Tween-80 at the same time, and stir in a water bath at 40°C for 8 hours , to obtain a lithium iron phosphate dispersion, the mass proportion of Tween-80 in the lithium iron phosphate dispersion is 35%.

[0058] 1.5gCu 2 SO 4 ·5H 2 O, 2.5gIn(NO 3 ) 3 4.5H 2 O and 1gCH 3 CSNH 2 Mix evenly with 14 g of deionized water to obtain a mixed solution. This mixed solution was mixed with a lithium iron phosphate dispersion to obtain a slurry.

[0059]The slurry was printed and sprayed onto a single crystal silicon substrate to obtain a 4 μm wet film, and dried at 120° C. to obtain a precursor thin film. Put the precursor film into...

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Abstract

The invention provides a low-temperature lithium iron phosphate and a preparation method and application thereof. The low-temperature lithium iron phosphate includes lithium iron phosphate as the core, CuInS coated on the surface of the core 2 layer, and clad in CuInS 2 layer surface LiTaO 3 Floor. The present invention also provides a method for preparing low-temperature lithium iron phosphate, comprising sequentially preparing CuInS 2 layer-coated lithium iron phosphate and LiTaO 3 Modified CuInS 2 layer-coated lithium iron phosphate precursor, annealing the precursor to obtain the low-temperature lithium iron phosphate. The present invention also provides a positive electrode material for a lithium ion battery comprising the above-mentioned low-temperature lithium iron phosphate. The lithium iron phosphate provided by the invention has a high rate and can maintain good charge and discharge performance in a low temperature environment.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a low-temperature lithium iron phosphate and its preparation method and application. Background technique [0002] At present, there are many research systems used as cathode materials for lithium-ion batteries, but only lithium cobalt oxide (LiCoO 2 ), LiMn 2 o 4 、LiFePO 4 , Ternary composite oxide. LiCoO 2 Expensive, poor safety performance, LiMn 2 o 4 Compared with LiCoO 2 The raw materials are relatively cheap, and the thermal stability of the material is slightly higher, but LiMn 2 o 4 The capacity is low and the high temperature performance is poor. A New Ternary Composite Oxide Li1 / 3Co1 / 3Mn1 / 3O 2 with LiCoO 2 With the same structure, it has high energy density, but the safety performance of ternary materials is poor, which is a problem that has plagued the entire battery industry and has not been completely resolved so far. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525H01M10/42
CPCH01M4/366H01M4/5825H01M10/0525H01M10/4235H01M2004/028Y02E60/10
Inventor 万宁李萍萍王庆莉彭家兴杨茂萍
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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