期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 614, 期 -, 页码 271-276出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.06.086
关键词
Cathode material; Li2MnSiO4; Solvothermal synthesis; Carbon coating; Ni-modified
资金
- National Natural Science Foundation of China [51372136]
- Shenzhen Basic Research Project [JCYJ20130402145002372]
Orthorhombic structure Li2MnSiO4/C with Pmn2(1) space group is synthesized by the solvothermal method. Carbon coating and Ni2+ doping are used to improve the electronic conductivity and the cycling performance of Li2MnSiO4 cathode material, respectively. The particles of Li2MnSiO4/C are much smaller and more uniform than those of Li2MnSiO4 due to the carbon coating. It is shown that Ni2+ has been reduced into metal Ni during the synthesis process. The synthesized Ni-modified Li2MnSiO4/C (denoted as (LMS@Ni)/C) cathode material exhibits better electrochemical performance in comparison with Li-2-MnSiO4/C, attributing to higher lithium ion diffusion coefficient as well as electronic conductivity. The initial discharge capacity of (LMS@Ni)/C is 274.5 mA h g(-1) and the reversible capacity after 20 cycles is 119.8 mA h g(-1) at 25 degrees C. (C) 2014 Elsevier B.V. All rights reserved.
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