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| Synthesis and electrochemical properties of truncated octahedral LiZn0.08Al0.01Mn1.91O4 cathode material by solid-state combustion method |
| Author Name | Affiliation | E-mail | | WANG Nian | Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, School of Chemistry and Environment, Yunnan Minzu University, Kunming 650500, China | | | LI Meng | Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, School of Chemistry and Environment, Yunnan Minzu University, Kunming 650500, China | | | JI Ying | Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, School of Chemistry and Environment, Yunnan Minzu University, Kunming 650500, China | | | XIANG Ming-Wu | Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, School of Chemistry and Environment, Yunnan Minzu University, Kunming 650500, China | | | GUO Yu-Jiao | Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, School of Chemistry and Environment, Yunnan Minzu University, Kunming 650500, China
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China | guoyujiao1988@163.com | | BAI Hong-Li | Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, School of Chemistry and Environment, Yunnan Minzu University, Kunming 650500, China | | | LIU Xiao-Fang | Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, School of Chemistry and Environment, Yunnan Minzu University, Kunming 650500, China | | | GUO Jun-Ming | Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, School of Chemistry and Environment, Yunnan Minzu University, Kunming 650500, China | guojunming@tsinghua.org.cn |
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| Abstract: A single-crystal truncated octahedral morphology LiZn0.08Al0.01Mn1.91O4 cathode material with {111}, {110}, and {100} crystal surfaces was synthesized by a solid-state combustion method. The results show that Zn-Al co-doped promotes the crystal development and the selective growth of crystal surfaces of spinel LiMn2O4 materials, while forming single-crystal truncated octahedral grain. The Zn-Al co-doped sample effectively inhibits the JahnTeller effect and reduces Mn dissolution, thus enhancing the crystal structure stability and significantly improving the electrochemical performance. The initial discharge specific capacity of LiZn0.08Al0.01Mn1.91O4 were 92.6 and 76.5 mAh·g-1 at 5C and 10C, the corresponding capacity retention remained 70.4% and 74.8% after 2 000 cycles, respectively. Even at a high current density of 15C, the initial discharge capacity was still 64.2 mAh·g-1, and the capacity retention can reach 82.2% after 800th cycles. Compared with LiZn0.08Mn1.92O4, the LiZn0.08Al0.01Mn1.91O4 cathode material had a larger Li+ diffusion coefficient (1.02×10-11 cm2·s-1) and smaller apparent activation energy (25.60kJ mol-1). The results show that the Zn-Al co-doped and monocrystalline morphology control strategy can reduce the energy barrier of Li+ during the de-intercalation process and increase the diffusion rate in electrode materials. |
| Keywords: LiMn2O4 Zn-Al co-doping cathode material Jahn-Teller effect Mn dissolution truncated octahedron solid-state combustion method |
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| WANG Nian,LI Meng,JI Ying,XIANG Ming-Wu,GUO Yu-Jiao,BAI Hong-Li,LIU Xiao-Fang,GUO Jun-Ming.Synthesis and electrochemical properties of truncated octahedral LiZn0.08Al0.01Mn1.91O4 cathode material by solid-state combustion method[J].Chinese Journal of Inorganic Chemistry,2023,39(6):1042-1052. |
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