Evolution of the rate-limiting step: From thin film to thick Ni-rich cathodes
by Hu, J. T.; Wu, B. B.; Cao, X.; Bi, Y. J.; Chae, S. J.; Niu, C. J.; Xiao, B. W.; Tao, J. H.; Zhang, J. G.; Xiao, J.
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.
- Journal
- Journal of Power Sources
- Volume
- 454
- Year
- 2020
- URL
- https://dx.doi.org/10.1016/j.jpowsour.2020.227966
- ISBN/ISSN
- 1873-2755; 0378-7753
- DOI
- 10.1016/j.jpowsour.2020.227966