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LATP ionic conductor and in-situ graphene hybrid-layer coating on LiFePO4 cathode material at different temperatures

Yang, Chun-Chen and Jiang, Jia-Rong and Karuppiah, Chelladurai and Jang, Jer-Huan and Wu, Zong-Han and Rajan, Jose and Lue, Shingjiang Jessie (2018) LATP ionic conductor and in-situ graphene hybrid-layer coating on LiFePO4 cathode material at different temperatures. Journal of Alloys and Compounds, 765. pp. 800-811. ISSN 0925-8388 (Print); 1873-4669 (Online)

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Abstract

In this work, a hybrid-layer coated LiFePO4/C (LFP/C) cathode material is investigated for the application of high temperature performance of Li-ion battery. The electrochemical performance of the material is significantly enhanced by improving its ionic and electronic conductivity via hybrid-layer coating, i.e., Li1.4Al0.4Ti1.6(PO4)3 (LATP) and graphene nanosheets (GNS) layer. Initially, the LATP layer is coated by a sol-gel method and later, the in-situ GNS layer is coated through a wet chemical process. The characteristic properties of LFP/C@LATP@GNS composite are examined by various spectroscopy and microscopy method. The electrochemical performances of LFP/C@LATP@GNS cathode material have been evaluated at different temperature such as −20 °C, 25 °C and 55 °C. The best electrochemical performance is observed at 55 °C with the discharge capacities of 160, 156, 154, 153, 149, 144, and 130 mAh g−1 at 0.1C, 0.2C, 0.5C, 1C, 3C, 5C, and 10C rate, respectively. Due to its higher ionic and electronic conductivity, the long cycle-life is obtained for LFP/C@LATP@GNS cathode material at 55 °C, which is maintained over 500 cycles at 10C rate with the fading rate of ca. 8.76%. Hence, the dual-layer coating on LFP cathode material is the superior method to develop the high performance Li-ion battery for electric vehicles.

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Li1.4Al0.4Ti1.6(PO4)3 (LATP); In-situ grapheme; Hybrid coating; Surface modification; LiFePO4
Subjects: Q Science > Q Science (General)
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 16 Nov 2018 04:18
Last Modified: 21 Jan 2019 08:27
URI: http://umpir.ump.edu.my/id/eprint/22325
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