期刊
ACS ENERGY LETTERS
卷 6, 期 6, 页码 2081-2089出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c00426
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资金
- Taishan Scholar's Advantageous and Distinctive Discipline Program of Shandong Province - Australian Government through the Australian Research Council [ARC FL170100101]
The study demonstrates that NTMP material synthesized using a non-stoichiometric strategy can significantly improve its performance, including reducing discharge plateau and suppressing voltage hysteresis, making it have higher cycling stability.
Na superionic conductor (NASICON)-structured Na3TiMn(PO4)(3) (NTMP) is a promising cathode material for sodium-ion batteries. However, it suffers from a low discharge plateau at about 2.5 V, which leads to not only a substantial capacity decrease in high-voltage discharge plateaus at 4.0 and 3.5 V but also a severe voltage hysteresis. This work demonstrates that NTMP material synthesized using a non-stoichiometric strategy displays a negligible discharge plateau at 2.5 V and substantially suppressed voltage hysteresis. The sample also exhibits the highest cycling stability among all polyanionic Mn-based cathode materials, with capacity retention of 91.7% after 2000 cycles. Experimental and computational data show that the 2.5 V plateau is associated with Na+/Mn2+ cation mixing, which can be substantially suppressed using the non-stoichiometric strategy.
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