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Low-temperature strategy to synthesize single-crystal LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) with enhanced cycling performances as cathode material for lithium-ion batteries

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Nano Research 2022年第3期15卷 2052-2059页

作者： Fangya Guo Yongfan Xie Youxiang Zhang College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China

With high reversible capacities of more than 200 mAh/g,Ni-rich layered oxides Li[Ni_(x)Co_(y)Mn_(1–x–y)]O_(2)(x≥0.6)serve as the most promising cathode materials for lithium-ion batteries(LIBs).However,the anisotropic lattice volume changes linked to theirα-NaFeO_(2)structured crystal grains bring about poor cycle performances for conventionally produced NCM *** deal with these issue,single-crystalµm-sized LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)rods was synthesized by a hydrothermal *** with conventional synthesis methods,these LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)rods were calcined at a low temperature with excessive lithium sources,which not only reduces the sintering temperature but also ensures the mono-dispersed micrometer-scaled particle *** used as the cathode material for LIBs,the as-prepared LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2),with ordered layered-structure and low degree of cation mixing,shows excellent electrochemical *** sintered at 750°C with 50%Li-excess,the cathode material delivered an initial discharge capacity of 226.9 mAh/g with Coulombic efficiency of 91.2%at 0.1 C(1 C=200 mA/g)in the voltage range of 2.8‒4.3 *** charge-discharged at 1 C for 100 cycles,discharge capacity of 178.1 mAh/g with the capacity retention of 95.1%are still *** cycling stability at high cut-off voltage is also *** superior electrochemical properties should be related to the monodispersed micron scaled morphology which not only decreases the contact area between electrode and electrolyte but also mitigates the formation of *** low-temperature strategy of synthesizing single-crystal LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)rods should be able to provide a feasible method for synthesizing other single-crystal Ni-rich cathode materials with excellent electrochemical performances for LIB.

关键词： lithium ions batteries cathode excessive lithium single crystal LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)

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