Non-stoichiometric synthesis and electrochemical performance of LiFe 1-xPO4/C cathode materials for lithium ion batteries

Chenglin Hu; Yuping Wu; Yongnian Dai

doi:10.1142/S1793604714500167

Non-stoichiometric synthesis and electrochemical performance of LiFe _1-xPO₄/C cathode materials for lithium ion batteries

Chenglin Hu, Yuping Wu, Yongnian Dai

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

Non-stoichiometric LiFe_1-xPO₄/C composites were synthesized by a simple sol-gel method. Different impurities were detected in the X-ray diffraction measurements with the change of Fe content. The effects of Fe-poor on the structure and electrochemical performance of LiFePO₄ were investigated. Compared with stoichiometric LiFePO₄/C, non-stoichiometric samples show better electrochemical performance because they have smaller impedance and faster lithium ion diffusion. Among these non-stoichiometric samples, LiFe_0.94PO₄/C cathode delivers the highest capacity of 149 mAh g^-1 at 0.2 C and 103 mAh g ^-1 at 5 C and no capacity loss was found after 100 full cycles.

Original language	English
Article number	1450016
Journal	Functional Materials Letters
Volume	7
Issue number	2
DOIs	https://doi.org/10.1142/S1793604714500167
State	Published - Apr 2014
Externally published	Yes

Keywords

Fe-poor
Li-ion batteries
cathode
lithium iron phosphate
non-stoichiometry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1142/S1793604714500167

Cite this

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abstract = "Non-stoichiometric LiFe1-xPO4/C composites were synthesized by a simple sol-gel method. Different impurities were detected in the X-ray diffraction measurements with the change of Fe content. The effects of Fe-poor on the structure and electrochemical performance of LiFePO4 were investigated. Compared with stoichiometric LiFePO4/C, non-stoichiometric samples show better electrochemical performance because they have smaller impedance and faster lithium ion diffusion. Among these non-stoichiometric samples, LiFe0.94PO4/C cathode delivers the highest capacity of 149 mAh g-1 at 0.2 C and 103 mAh g -1 at 5 C and no capacity loss was found after 100 full cycles.",

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AU - Wu, Yuping

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AB - Non-stoichiometric LiFe1-xPO4/C composites were synthesized by a simple sol-gel method. Different impurities were detected in the X-ray diffraction measurements with the change of Fe content. The effects of Fe-poor on the structure and electrochemical performance of LiFePO4 were investigated. Compared with stoichiometric LiFePO4/C, non-stoichiometric samples show better electrochemical performance because they have smaller impedance and faster lithium ion diffusion. Among these non-stoichiometric samples, LiFe0.94PO4/C cathode delivers the highest capacity of 149 mAh g-1 at 0.2 C and 103 mAh g -1 at 5 C and no capacity loss was found after 100 full cycles.

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