水热法一步合成磷酸铁锂及其性能研究

doi:10.11962/1006-4990.2019-0426

Abstract

Abstract:

In order to optimize the one-step preparation technology of lithium iron phosphate （LiFePO₄） by liquid phase me-thod,LiFePO₄ cathode material was synthesized from ferrous sulfate,ammonium dihydrogen phosphate and lithium hydroxide by adding sodium dodecylbenzene sulfonate（SDBS） as surfactant.The effect of one-step hydrothermal synthesis technology on the composition,structure,morphology and particle size of LiFePO₄ was studied.The material was characterized by ICP,XRD,SEM and particle size analyzer,and its electrochemical properties were tested.The results show that Li_1.02Fe_0.994PO₄ with micron spherical particle morphology has been synthesized.The first charge-discharge specific capacities at 0.1C ratio are 162.0 mA·h/g and 159.9 mA·h/g,respectively.The Coulomb efficiency is 98.7% and the rate performance（in terms of 1C/0.1C holding rate） is 92.3%,and the holding rate of capacity was 96.4% at 0.1C ratio after 100 times cycle.It showed good electrochemical performance.

Key words: Lithium iron phosphate, Hydrothermal method, Properties

CLC Number:

TQ131.11

Guo Ju,Jia Shuangzhu. Study on the one-step hydrothermal synthesis of LiFePO₄ and its properties[J]. Inorganic Chemicals Industry, 2020, 52(6): 36-40.

Figures/Tables 6

References 18

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元素	质量分数/%	相对P的物质的量比
Li	4.54	1.02
Fe	35.36	0.994
P	19.69	1

项目	a/nm	b/nm	c/nm	V/nm³
LiFePO₄材料	0.470 1	1.034 0	0.602 0	0.292 6
JCPDS 01-077-0179	0.478 7	1.008 6	0.593 9	0.286 7

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Inorganic Acid-Base-Salt Committee of CIESC

Study on the one-step hydrothermal synthesis of LiFePO₄ and its properties

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Study on the one-step hydrothermal synthesis of LiFePO4 and its properties