Improvement of thermal stability and safety of lithium ion battery using SiO anode material

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題名:	Improvement of thermal stability and safety of lithium ion battery using SiO anode material
作者:	劉奕宏;Liu, Yi-Hung;Okano, Miki;Mukai, Takashi;Inoue, Kenshi;Yanagida, Masahiro;Sakai, Tetsuo
貢獻者:	工學院化學工程與材料工程學系
關鍵詞:	Lithium ion battery;Safety;Silicon monoxide;Thermal stability
日期:	2016-02-01
上傳時間:	2026-04-21 14:48:15 (UTC+8)
出版者:	Elsevier;Elsevier B.V
摘要:	摘要： The thermal stability, in terms of cycle and rate performances at 80 °C, and its safety related to lithium ion batteries composed of a LiFePO4 cathode and SiO anode are investigated. Based on an STEM-EELS analysis, the SiO powder is found to have an amorphous structure, in which nanosized Si particles (Si-rich phase) are uniformly dispersed in the SiO2 matrix (SiO2-rich phase). During the charge/discharge cycling, the cell exhibits a satisfactory cycle performance with a discharge capacity retention of 93.6% and a voltage retention of 93.9% at the 1500th cycle. Also, the charge and discharge capacity retentions at 10 C are 97.5% and 94.7%, respectively, together with a limited polarization, demonstrating its high rate performance. Furthermore, a 1.16 Ah LiFePO4/SiO laminated cell shows negligible voltage and temperature changes during the nail penetration test. The Li concentration in the active material (Si-rich phase) is found to be almost the same as that in the SiO2-rich phase after the test. This high thermal stability and safety may be due to the formed layer from the SiO2 matrix, preventing any side reaction from occurring on the Si surface and isolating the internal current path during the nail penetration. [Display omitted] •Nanosized Si-rich and SiO2-rich phases are uniformly mixed in SiO material.•A LiFePO4\|SiO lithium ion battery exhibits high thermal stability at 80 °C.•A 1.16 Ah laminated LiFePO4\|SiO cell remains safe after a nail penetration test.•Li contents in Si-rich and SiO2-rich phases are the same after a nail penetration. 出版者： Elsevier B.V 出版日期： 2016-02-01 出處： Journal of Power Sources, 2016-02, Vol.304, p.9-14 資源來源： ScienceDirect 版權： 2015 Elsevier B.V. 識別號： ISSN: 0378-7753 識別號： EISSN: 1873-2755 識別號： DOI: 10.1016/j.jpowsour.2015.10.106
顯示於類別:	[化學工程與材料工程學系 ] 期刊論文

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