Multi-Core-shell structured LiFePO4@Na3V2(PO4)3@C composite for enhanced low-temperature performance of lithium ion batteries

Liu, Xiaoteng, Gu, Xingxing, Ren, Xiaolei, Liu, Xingyan, He, Youzhou and Liu, Tiefeng (2020) Multi-Core-shell structured LiFePO4@Na3V2(PO4)3@C composite for enhanced low-temperature performance of lithium ion batteries. Rare Metals. ISSN 1001-0521 (In Press)

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Abstract

In this work, a multi-core-shell structured LiFePO4@Na3V2(PO4)3@C (LFP@NVP@C) composite is successfully designed and prepared to address inferior low-temperature performance of LiFePO4 cathode for lithium ion batteries. TEM confirms the inner NVP and outer carbon layers co-existed on the surface of LFP particle. When evaluated at low-temperature operation, LFP@NVP@C composite exhibits an evidently enhanced electrochemical performance in term of higher capacity and lower polarization, compared with LFP@C. Even at -10 oC with 0.5 C, LFP@NVP@C delivers a discharge capacity of ca. 96.9 mAh·g-1 and discharge voltage of ca. 3.3 V, which is attributed to the beneficial contribution of NVP coating. NASICON-structured NVP with an open framework for readily insertion/desertion of Li+ will effectively reduce the polarization for the electrochemical reactions of the designed LFP@NVP@C composite.

Item Type: Article
Uncontrolled Keywords: LiFePO4@Na3V2(PO4)3@C composite, Multi-Core-shell, low-temperature, lithium ion batteries
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: John Coen
Date Deposited: 15 Jun 2020 13:06
Last Modified: 15 Jun 2020 13:15
URI: http://nrl.northumbria.ac.uk/id/eprint/43448

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