Layered LiNi0.80Co0.15Al0.05O2 as cathode material for hybrid Li+/Na+ batteries
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LiNi0.80Co0.15Al0.05O2 (NCA) is explored to be applied in a hybrid Li+/Na+ battery for the first time. The cell is constructed with NCA as the positive electrode, sodium metal as the negative electrode, and 1 M NaClO4 solution as the electrolyte. It is found that during electrochemical cycling both Na+ and Li+ ions are reversibly intercalated into/de-intercalated from NCA crystal lattice. The detailed electrochemical process is systematically investigated by inductively coupled plasma-optical emission spectrometry, ex situ X-ray diffraction, scanning electron microscopy, cyclic voltammetry, galvanostatic cycling, and electrochemical impedance spectroscopy. The NCA cathode can deliver initially a high capacity up to 174 mAh g−1 and 95% coulombic efficiency under 0.1 C (1 C = 120 mA g−1) current rate between 1.5–4.1 V. It also shows excellent rate capability that reaches 92 mAh g−1 at 10 C. Furthermore, this hybrid battery displays superior long-term cycle life with a capacity retention of 81% after 300 cycles in the voltage range from 2.0 to 4.0 V, offering a promising application in energy storage.
KeywordsHybrid ion battery Layer-structured oxide Ternary cathode Cycle life Rate capability
This study was supported by National Natural Science Foundation of China (grant no. 51577175), NSAF (grant no. U1630106), Hefei Center of Materials Science and Technology (2014FXZY006) and Education Ministry of Anhui Province (KJ2014ZD36). We are also grateful to Elementec Ltd. in Suzhou.
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