P2-type Na2/3Ni1/3Mn2/3O2 Cathode Material with Excellent Rate and Cycling Performance for Sodium-Ion Batteries
| Autor: | Jianwen Liu, Kehua Dai, Jing Mao, Guo Ai, Wanli Yang, Guosheng Shao, Tao Zhang, Heyang Jiang, Yan Feng, Wenfeng Mao, Gao Liu, Xin Liu |
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| Rok vydání: | 2019 |
| Předmět: |
Phase transition
Materials science Renewable Energy Sustainability and the Environment 020209 energy Intercalation (chemistry) Kinetics Analytical chemistry chemistry.chemical_element 02 engineering and technology Condensed Matter Physics Electrochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Anode chemistry 0202 electrical engineering electronic engineering information engineering Materials Chemistry Titration Cyclic voltammetry Carbon |
| Zdroj: | Journal of The Electrochemical Society. 166:A3980-A3986 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/2.0211916jes |
| Popis: | Author(s): Mao, J; Liu, X; Liu, J; Jiang, H; Zhang, T; Shao, G; Ai, G; Mao, W; Feng, Y; Yang, W; Liu, G; Dai, K | Abstract: P2-type Na2/3Ni1/3Mn2/3O2 is an air-stable cathode material for sodium-ion batteries. However, it suffers irreversible P2-O2 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 V voltage range, single-crystal micro-sized P2-type Na2/3Ni1/3Mn2/3O2 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+ 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 V is 87.6 mAh g−1. 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 Wh kg−1. 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. |
| Databáze: | OpenAIRE |
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