期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 19, 期 26, 页码 4536-4544出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b822854j
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资金
- National Science Council of Taiwan [97-ET-7-011-003-ET]
- National Taiwan University of Science and Technology
An energy- and time-efficient microwave-enhanced ion exchange (MW-IE) process is developed for the synthesis of low-cation-mixed LiNi0.5Mn0.5O2 cathode material. The synthesized MW-IE LiNi0.5Mn0.5O2 shows comparable low cation mixing (similar to 4%) within a short reaction time of 10 min, when comparing with conventional ion exchange processes with a reaction time of 5-10 h. The MW-IE LiNi0.5Mn0.5O2 delivers a higher initial discharge capacity (213 mAh g(-1)) than that obtained by the sol gel (SG) method (186 mAh g(-1)) when charging in the potential range of 2.5-4.6 V. Further electrochemical cycleability of MW-IE LiNi0.5Mn0.5O2 cathode demonstrates excellent capacity retention and rate capability compared to that of the SG LiNi0.5Mn0.O-5(2) cathode. The results show better Li+ ion pathways for MW-IE LiNi0.5Mn0.5O2, where Li+ ion transport in SG LiNi0.5Mn0.5O2 would be obstructed by transition metal cations (Ni2+, resulting from higher degree of cation mixing). The effective methodology developed could be easily extended to the synthesis of potential layered compounds with less cation-mixing.
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