Journal
JOURNAL OF POWER SOURCES
Volume 454, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.227966
Keywords
Ni-rich cathode; Rate-limiting step; Phase change; Electronic conductivity; Ionic conductivity
Funding
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy through Applie Battery Research Program
- DOE [DE-AC05-76RL01830]
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Ni-rich NMC (LiNixMnyCo1-x-yO2, x >= 0.6) has the attributes of high specific capacity (greater than 180 mAh/g), high operating voltage (ca. 3.8 V) and low cost, which is therefore deemed as one of the most promising cathode candidates for next-generation high-energy Li-ion batteries (LIBs). However, challenges exist before the large-scale commercialization of Ni-rich cathode such as gas generation, capacity degradation especially at high rates or elevated temperatures. From thin film to densely packed high loading cathode, this work investigates the rate-limiting steps in Ni-rich cathode e.g., phase structure, electronic and ionic conductivity to understand the reaction kinetics at different scales. This work provides new insights in understanding the electrochemical properties of Ni-rich cathode at different levels to inspire revolutionary ideas to address the fundamental issues of Ni-rich cathode from material to relevant electrode levels.
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