Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4766838 | Electrochimica Acta | 2017 | 7 Pages |
Abstract
LiNi0.5Mn0.3Co0.2O2 (NMC) cathode material is surface treated by Li active boron oxide (LBO) via a two-step process. The surface morphology, crystal structure, surface composition, and electrochemical properties were characterized based on SEM, XRD, XPS, charge-discharge tests, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) measurements. XPS results showed that the coating layer was composed of LiBO2. The 2 wt% LBO-coated NMC exhibited the best electrochemical performance at high voltage (4.5 V). It was achieved a high capacity retention of 91.23% after 50 cycle which was 53.19% for the uncoated one. The rate capability of the coated electrode was improved obviously, exhibiting 114.71 mAh·g-1 discharge capacity at 10 C. The interfacial resistance and charge transfer resistance was also decreased owning to the fact that the coating layer played a “firewall” between the electrolyte and the NMC electrode.
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Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Weiqiang Hu, Chuanhui Zhang, Heng Jiang, Mingsen Zheng, Qi-Hui Wu, Quanfeng Dong,