Nanoscale Coating of LiMO2 (M = Ni, Co, Mn) Nanobelts with Li+-Conductive Li2TiO3: Toward Better Rate Capabilities for Li-Ion Batteries
2013
Lu, Jun | Peng, Qing | Wang, Weiyang | Nan, Caiyun | Li, Lihong | Li, Yadong
By using a novel coating approach based on the reaction between MC₂O₄·xH₂O and Ti(OC₄H₉)₄, a series of nanoscale Li₂TiO₃-coated LiMO₂ nanobelts with varied Ni, Co, and Mn contents was prepared for the first time. The complete, thin Li₂TiO₃ coating layer strongly adheres to the host material and has a 3D diffusion path for Li⁺ ions. It is doped with Ni²⁺ and Co³⁺ ions in addition to Ti⁴⁺ in LiMO₂, both of which were found to favor Li⁺-ion transfer at the interface. As a result, the coated nanobelts show improved rate, cycling, and thermal capabilities when used as the cathode for Li-ion battery.
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