Journal
NANO ENERGY
Volume 87, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106172
Keywords
Phosphomolybdic acid; Single-crystalline; Surface modification; Ni-rich cathode; Li-ion batteries
Categories
Funding
- National Key Research and Development Program of China [2016YFA0202500]
- Basic Science Center Project of National Natural Science Foundation of China (NSFC) [51788104]
- National Natural Science Foundation of China [51803054, 51902314]
- Beijing Natural Science Foundation [L182051]
- Transformational Technologies for Clean Energy and Demonstration, Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21070300]
- Youth Innovation Promotion Association CAS [2019033]
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The study demonstrates that by treating with phosphomolybdic acid, the surface chemical composition and properties of Ni-rich single-crystalline cathode can be effectively regulated, suppressing phase transformation and CEI growth during cycling, leading to improved cycle life and thermal stability of the battery.
Ni-rich single-crystalline cathode has been demonstrated to be a promising candidate for next-generation high energy density batteries by solving intergranular cracks occurring in its counterpart consisting of aggregated small primary particles. However, the inherently unstable surface nature of Ni-rich cathodes, such as rock-salt phase transition, reactive oxygen release, and parasitic side reactions, has not been solved, which would deteriorate the electrochemical performance of single-crystalline Ni-rich cathode. To further improve the durability, these surface issues should be urgently mitigated. Herein, we proffer a simple yet effective method to regulate the surface chemical composition and property of single-crystalline LiNi0.8Co0.1Mn0.1O2 via phosphomolybdic acid treating. This novel surface treating method successfully suppressed rock-salt phase transformation and (cathode electrolyte interphase) CEI growth during cycling. As a result, the as-obtained LiNi0.8Co0.1Mn0.1O2 cathode exhibits excellent capacity retention of 92% after 200 cycles at 0.5 C. Also, a remarkable enhancement of thermal stability was achieved. This work demonstrates the great potential of surface modification strategy for Ni-rich single-crystalline cathode and would pave the way for its implementation.
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