Journal
ELECTROCHIMICA ACTA
Volume 211, Issue -, Pages 507-514Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.06.069
Keywords
Li-ion batteries; Micron Li-rich layered oxides; Two-step chemical lithiation method
Categories
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09010101]
- Science and Technology Service Network Initiative of the Chinese Academy of Science [KFJ-EW-STS-110]
- Ningbo Science and Technology Innovation Team [2012B82001]
- Cooperation of the Chinese Academy of Science
- United states Department of Energy [174433KYSB20150047]
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Li-rich layered oxides with micro-sized primary particles usually exhibit higher pellet density and better cycling performance. However, it is often at the expense of high reversible capacity. Here, we reported a simple strategy through a new chemical lithiation with micro-sized spinel-precursors and Na2S2O8 surface treatment to obtain micro-sized particles in the Li-rich Li1.172Ni0.135Co0.135Mn0.539O2 oxide without compromising its discharge capacity (260 mAh/g at 0.1C). Benefited from its larger particles and lower specific surface area, the obtained micron Li-rich layered material manifests its higher pellet density (3.18 g/cm(3)) and better cycling performance in comparison with the nano-sized Li-rich layered material. After 100 cycles at 0.1 C, it can still deliver a capacity of 192 mAh/g with retention of 74%, much higher than 167 mAh/g with retention of 67% of the nano-sized sample. Moreover, the micron Li-rich layered material also exhibits good rate performance with a capacity of 174 mAh/g at 2C benefited from the 3D Li+ insertion/extraction channel of its surface spinel content. These results may provide a new insight on improving pellet density of high-performance Li-rich layered cathode materials. (C) 2016 Elsevier Ltd. All rights reserved.
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