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Structural characterization of layered LiNi0.85−xMnxCo0.15O2 with x = 0, 0.1, 0.2 and 0.4 oxide electrodes for Li batteries |
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| Authors: | Yi-Jie Gu Yun-Bo ChenHong-Quan Liu Yan-Ming WangCui-Ling Wang Hui-Kang Wu |
| Affiliation: | a College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266510, China b Department of Chemistry, University of California, Riverside, CA 92521, USA c Advanced Manufacture Technology Center, China Academy of Machinery Science and Technology, Beijing 100044, China d Department of Materials Engineering, Jining Technology College, Jining, Shandong 272013, China |
| Abstract: | We report the synthesis of LiNi0.85−xCo0.15MnxO2 positive electrode materials from Ni0.85−xCo0.15Mnx(OH)2 and Li2CO3. XRD and XPS are used to study the effect of Mn-doping on the microstructures and oxidation states of the LiNi0.85−xCo0.15MnxO2 materials. The analysis shows that Mn-doping promotes the formation of a single phase. With increasing substitution of Mn ions for Ni ions, the lattice parameter a decreases, while the lattice parameters c and c/a increase. XPS revealed that the oxidation states of Ni, Co and Mn in LiNi0.85−xCo0.15MnxO2 compounds (where x = 0.1, 0.2 and 0.4) were +2/+3, +3 and +4. The substitution of Mn ions for Ni ions induces a decrease in the average oxidation state of Ni. Because the substitution of Mn for Ni ions is complex, the extent of the changes between the lattice parameter and LM-O differ. The occupation of Ni in Li sites is affected by the ordering of Mn4+ with Ni2+ and Mn4+ with Li+. |
| Keywords: | The ordering of Mn4+ with Ni2+ and Mn4+ with Li+ Mn-doping LM-O Structural characterization Li batteries |
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