@article{32474,
  author = {Jing Mao and Xin Liu and Jianwen Liu and Heyang Jiang and Tao Zhang and Guosheng Shao and Guo Ai and Wenfeng Mao and Yan Feng and Wanli Yang and Gao Liu and Kehua Dai},
  title = {P2-type Na <sub>2/3</sub> Ni <sub>1/3</sub>Mn <sub>2/3</sub>O <sub>2</sub> Cathode Material with Excellent Rate and Cycling Performance for Sodium-Ion Batteries},
  abstract = {<p><span>P2-type Na</span><span>2/3</span><span>Ni</span><span>1/3</span><span>Mn</span><span>2/3</span><span>O</span><span>2</span><span>&nbsp;is an air-stable cathode material for sodium-ion batteries. However, it suffers irreversible P2-O2&nbsp;phase transition in 4.2-V plateau and shows poor cycling stability and rate capability within this plateau. To evaluate the practicability of this material in 2.3–4.1&nbsp;V voltage range, single-crystal micro-sized P2-type Na</span><span>2/3</span><span>Ni</span><span>1/3</span><span>Mn</span><span>2/3</span><span>O</span><span>2</span><span>&nbsp;with high rate capability and cycling stability is synthesized via polyvinylpyrrolidone (PVP)-combustion method. The electrochemical performance is evaluated by galvanostatic charge-discharge tests. The kinetics of Na</span><span>+</span><span>&nbsp;intercalation/deintercalation is studied detailly with potential intermittent titration technique (PITT), galvanostatic intermittent titration technique (GITT) and cyclic voltammetry (CV). The discharge capacity at 0.1 C in 2.3–4.1&nbsp;V is 87.6&nbsp;mAh g</span><span>−1</span><span>. It can deliver 91.5% capacity at 40 C rate and keep 89% after 650 cycles at 5C. The calculated theoretical energy density of full cell with hard carbon anode is 210&nbsp;Wh kg</span><span>−1</span><span>. The moderate energy density associated with high power density and long cycle life is acceptable for load adjustment of new-energy power, showing the prospect of practical application.</span></p>},
  year = {2019},
  journal = {Journal of The Electrochemical Society},
  volume = {166},
  pages = {A3980 - A3986},
  month = {12/2019},
  issn = {0013-4651},
  doi = {10.1149/2.0211916jes},
  language = {eng},
}