Characteristics of LiCoO2, LiMn2O4 and LiNi0.45Co0.1Mn0.45O2 as cathodes of lithium ion batteries |
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Authors: | Guo Hua-jun Li Xin-hai Zhang Xin-ming Zeng Su-ming Wang Zhi-xing Peng Wen-jie |
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Affiliation: | (1) School of Metallurgical Science and Engineering, Central South University, 410083 Changsha, China;(2) School of Materials Science and Engineering, Central South University, 410083 Changsha, China |
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Abstract: | LiNi0.45Co0.10Mn0.45O2 was synthesized from Li2CO3 and a triple oxide of nickel, cobalt and manganese at 950 °C in air. The structures and characteristics of LiNi0.45Co0.10Mn0.45O2, LiCoO2 and LiMn2O4 were investigated by XRD, SEM and electrochemical measurements. The results show that LiNi0.45Co0.10Mn0.45O2 has a layered structure with hexagonal lattice. The commercial LiCoO2 has sphere-like appearance and smooth surfaces, while the LiMn2O4 and LiNi0.45Co0.10Mn0.45O2 consist of cornered and uneven particles. LiNi0.45Co0.10Mn0.45O2 has a large discharge capacity of 140.9 mA · h/g in practical lithium ion battery, which is 33.4% and 2.8% above that of LiMn2O4 and LiCoO2, respectively. LiCoO2 and LiMn2O4 have higher discharge voltage and better rate-capability than LiNi0.45Co0.10Mn0.45O2. All the three cathodes have excellent cycling performance with capacity retention of above 89.3% at the 250th cycle. Batteries with LiMn2O4 or LiNi0.45Co0.10Mn0.45O2 cathodes show better safety performance under abusive conditions than those with LiCoO2 cathodes. Foundation item: Project(50302016) supported by the National Natural Science Foundation of China; Project(2005037698) supported by the Postdoctoral Science Foundation of China |
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Keywords: | lithium ion batteries cathode LiCoO2 LiMn2O4 LiNi0.45Co0.10Mn0.45O2 |
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