磁滞
化学计量学
高原(数学)
阴极
快离子导体
材料科学
分析化学(期刊)
导线
电压
化学工程
电解质
化学
电极
复合材料
物理化学
电气工程
凝聚态物理
数学分析
工程类
物理
色谱法
数学
作者
Jiansheng Zhang,Chunfu Lin,Qingbing Xia,Chao Wang,Xin Zhao
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2021-05-11
卷期号:6 (6): 2081-2089
被引量:35
标识
DOI:10.1021/acsenergylett.1c00426
摘要
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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