The reactivity of delithiated Li(Ni1/3Co1/3Mn1/3)O2, Li(Ni0.8Co0.15Al0.05)O2 or LiCoO2 with non-aqueous electrolyte |
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| Institution: | 1. SMIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, No. 92 West-Da Zhi Street, Harbin 150001, China;2. Ruipu Energy Co., Ltd., Shanghai 201206, China;3. College of Materials Science and Engineering, Shenzhen University, Shenzhen, Guangdong 518071, China;4. Zhuhai Zhongli New Energy Sci-Tech Co., Ltd., Zhuhai, Guangdong 519175, China |
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| Abstract: | The high temperature reactions of 1 M LiPF6 EC:DEC and LiCoO2, Li(Ni1/3Co1/3Mn1/3)O2 (NCM) or Li(Ni0.8Co0.15Al0.05)O2 (NCA) charged to 4.2 V and 4.4 V, respectively, were studied by accelerating rate calorimetry (ARC). The results indicate that NCM shows better thermal stability than both LiCoO2 and NCA. The state-of-the-art NCA sample shows better safety properties than LiCoO2. The reactivity of the samples depends on the electrolyte:active material ratio used during ARC testing. Electrode materials charged to 4.4 V are more reactive than the electrode materials charged to 4.2 V. These results should be useful for Li-ion battery researchers interested in maximizing the safety of high energy density cells and also as a benchmark for other researchers using ARC. |
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