期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 25, 页码 21267-21275出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b04338
关键词
sodium ion battery; manganese-based cathode; layered-tunnel hybrids; synergistic approach; ultrahigh rate capability
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [NRF-2015R1A2A1A15055227]
- National Natural Science Foundation of China [21373008]
- National Key Research and Development of China [2016YFB0100202]
- China Postdoctoral Science Foundation [2014M562322]
- Science and Technology Pillar Program Of Sichuan University [2014GZ0077]
- Development of Advanced Electrode and Electrolytes for LIB (AutoCRC) [1-111]
- National Research Foundation of Korea [2012R1A3A2048841] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A synergistic approach for advanced cathode materials is proposed. Sodium manganese oxide with a layered-tunnel hybrid structure was designed, synthesized, and subsequently investigated. The layered-tunnel hybrid structure provides fast Na ion diffusivity and high structural stability thanks to the tunnel phase, enabling high rate capability and greatly improved cycling stability compared to that of the pure P2 layered phase while retaining the high specific capacity of the P2 layered phase. The hybrid Structure provided a decent discharge capacity of 133.4 mAh g(-1) even at 8 C, which exceeds the reported hest rate capability for Mn-based cathodes. It also displayed an impressive cycling stability, maintaining 83.3 mAh g(-1) after 700 cycles at 10 C. Theoretical calculation and the potentiostatic intermittent titration technique (PITT) demonstrated that this hybrid structure helps enhance Na ion diffusivity during charge and discharge, attaining, as a result, an unprecendented electrochemical performance.
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