A P2-type layered Na0.75Ni1/3Ru1/6Mn1/2O2 cathode material with excellent rate performance for sodium ion batteries.
A P2-type layered Na0.75Ni1/3Ru1/6Mn1/2O2 cathode material with excellent rate performance for sodium ion batteries.
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一种P2型层状Na0.75Ni1/3Ru1/6Mn1/2O2正极材料，具有优异的钠离子电池倍率性能。
DOI：
10.1021/acsami.0c09082
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发表时间：
2020-08
影响因子：
9.5
通讯作者：
Haoshen Zhou
中科院分区：
文献类型：
--
作者：
Qi Wang;Shiyong Chu;Kezhu Jiang;Yuzhang Feng;Xueping Zhang;Peng Wang;Shaohua Guo;Haoshen Zhou
过渡金属层状氧化物材料具有高的可逆比容量和良好的循环性能，是目前最有前途的钠离子电池正极材料之一。P2型材料具有优势的开放扩散路径，可获得较高的倍率性能。本文报道了一种新型P2相正极材料Na0.75Ni1/3Ru1/6Mn1/2O2(NRM)。正极材料的容量可达161.5 mAHg-1，表现出优异的倍率性能(当倍率从0.2C增加到10C时，容量保持74%)，即使在10C高倍率下，500次循环仍保持79.5%。并用原位X射线衍射仪研究了循环过程中的结构变化。采用恒电流间歇滴定技术，计算了Na+在锰基层状氧化物中的扩散系数。该材料表现出良好的电化学性能，尤其是优异的倍率性能，将很好地促进SIB的商业化，特别是快速充电或高功率电池。
Transition metal layered oxide material is one of the most promising cathode materials for sodium ion batteries (SIBs) because of the high reversible specific capacity and excellent cyclicity. P2 type material possesses its preponderant open diffusion pathway that leads to great rate performance. Herein we reported a novel P2 phase cathode material Na0.75Ni1/3Ru1/6Mn1/2O2 (NRM). The NRM cathode could deliver a high capacity of 161.5 mAh g-1, represents excellent rate performance (when the rate increases from 0.2C to 10C the capacity keeps 74%) and maintains 79.5% for 500 cycles even at 10C high rate. In-situ X-ray diffraction was also conducted to reveal the structural evolution during cycling. Galvanostatic intermittent titration technique was carried out and the calculated Na+ diffusion coefficient is extremely high among Mn-based layered oxides. This material expresses good electrochemical property notably excellent rate performance, which will well promote the commercialization of SIBs, especially the fast-charging or high-power batteries.
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