3 years ago

Multistage Li1.2Ni0.2Mn0.6O2 Micro-architecture towards High-Performance Cathode Materials for Lithium-Ion Batteries

Multistage Li1.2Ni0.2Mn0.6O2 Micro-architecture towards High-Performance Cathode Materials for Lithium-Ion Batteries
Hongfei Zheng, Baihua Qu, Qingshui Xie, Laisen Wang, Xiaokang Ju, Wei He, Shengyang Li, Yating Ma, Dong-Liang Peng
Constructing hierarchical-architecture primary nanoparticles that assemble with secondary micro-architectures is very effective to achieve high-performance cathode materials for lithium-ion batteries (LIBs). In this work, well-crystallized lithium-rich layered oxide cathode materials Li1.2Ni0.2Mn0.6O2 (LNMO) with a micro-architecture was successfully synthesized. The preparation process is divided into two steps: the solvothermal process synthesizes the precursor Ni0.25Mn0.75CO3 (NMCO) and gradient temperature calcination is used to prepare the primary nanoparticles that agglomerate into hierarchical microspheres for final-product LNMO. The as-prepared material was used as cathode materials for LIBs, which exhibit good cycle life and excellent rate performances. The material retains a fairly high discharge capacity of approximately 180 mAh g−1 after 180 cycles at the 2C rate (1C=200 mA g−1). Even after a 50-fold (5C/0.1C) increase, a discharge capacity 61.4 %  (153.8 mAh g−1) of the capacity at 0.1C (ca. 249.1 mAh g−1) could be retained. This superior cycle life and rate performance are attributed to the merits of the hierarchical nano-/microsphere structures. Levels of complexity: The Li1.2Ni0.2Mn0.6O2 micro-/nano-architecture retains a fairly high discharge capacity of approximately 180 mAh g−1 after 180 cycles at the 2C rate (1C=200 mA g−1). Even after a 50-fold (5C/0.1C) increase, a discharge capacity 61.4 % (153.8 mAh g−1) of the capacity at 0.1C (ca. 249.1 mAh g−1) can still be retained, showing excellent rate performances and stability.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/celc.201700727

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