@article{Zhao2023, 
author = {Ruiqi Zhao and Manman Wu and Peixin Jiao and Xueting Wang and Jie Zhu and Yang Zhao and Hongtao Zhang and Kai Zhang and Chenxi Li and Yanfeng Ma and Yongsheng Chen},
title = {A double-layer covered architecture with spinel phase induced by LiPP for Co-free Li-rich cathode with high-rate performance and long lifespan},
year = {2023},
journal = {Nano Research},
volume = {16},
number = {5},
pages = {6805-6814},
keywords = {Co-free Li-rich layered oxides, double-layer covered architecture, lithium polyphosphate, high-rate performance, long cycle life},
url = {https://www.sciopen.com/article/10.1007/s12274-022-5333-z},
doi = {10.1007/s12274-022-5333-z},
abstract = {Co-free Li-rich Mn-based layered oxides are promising candidates for next-generation lithium-ion batteries (LIBs) due to their high specific capacity, high voltage, and low cost. However, their commercialization is hindered by limited cycle life and poor rate performance. Herein, an in-situ simple and low-cost strategy with a nanoscale double-layer architecture of lithium polyphosphate (LiPP) and spinel phase covered on top of the bulk layered phase, is developed for Li1.2Mn0.6Ni0.2O2 (LMNO) using Li+-conductor LiPP (denoted as LMNO@S-LiPP). With such a double-layer covered architecture, the half-cell of LMNO@S-LiPP delivers an extremely high capacity of 202.5 mAh·g−1 at 1 A·g−1 and retains 85.3% of the initial capacity after 300 cycles, so far, the best high-rate electrochemical performance of all the previously reported LMNOs. The energy density of the full-cell assembled with commercial graphite reaches 620.9 Wh·kg−1 (based on total weight of active materials in cathode and anode). Mechanism studies indicate that the superior electrochemical performance of LMNO@S-LiPP is originated from such a nanoscale double-layer covered architecture, which accelerates Li-ion diffusion, restrains oxygen release, inhibits interfacial side reactions, and suppresses structural degradation during cycling. Moreover, this strategy is applicable for other high-energy-density cathodes, such as LiNi0.8Co0.1Mn0.1O2, Li1.2Ni0.13Co0.13Mn0.54O2, and LiCoO2. Hence, this work presents a simple, cost-effective, and scalable strategy for the development of high-performance cathode materials.}
}