LiVPO4F: A new active material for safe lithium-ion batteries |
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| Institution: | 1. Valence Technology Inc., Rissington Business Park, Gloucestershire, GL54 2QB, UK;2. Valence Technology, Inc., 301 Conestoga Way, Henderson, Nevada 89015, USA;1. Key Laboratory of High-speed Railway Engineering of the Ministry of Education, Southwest Jiaotong University, Chengdu 610031, PR China;2. School of Materials Science and Engineering, Key Laboratory of Transportation Tunnel Engineering (Ministry of Education), Southwest Jiaotong University, Chengdu 610031, PR China;3. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, PR China |
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| Abstract: | In this paper, we report the latest findings for the new lithium vanadium fluorophosphate cathode material, LiVPO4F. High quality samples have been prepared using a carbothermal reduction approach and extensive electrochemical and DSC measurements have been performed. In graphite based lithium-ion cells, the LiVPO4F demonstrates reversible specific capacity behavior approaching theoretical. The lithium-ion system operates with an average discharge voltage around 4 V, low polarization and with good rate capability. These results indicate that the active material possesses exemplary electrochemical performance and may well be suitable as a replacement for LiCoO2 in commercial lithium-ion cells. DSC measurements on charged cathodes indicate the thermal stability behavior expected for a phosphate based active material. |
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