Evolution of the Rate-Limiting step: From Thin Film to Thick Ni-rich Cathodes

Journal Article · Wed Apr 01 00:00:00 EDT 2020 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2020.227966· OSTI ID:1606201

Hu, Jiangtao ^[1]; Wu, Bingbin ^[1]; Cao, Xia ^[1]; Bi, Yujing ^[1]; Chae, Sujong ^[1]; Niu, Chaojiang ^[1]; Xiao, Biwei ^[1]; Tao, Jinhui ^[1]; Zhang, Jiguang ^[1]; Xiao, Jie ^[1]

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1. BATTELLE (PACIFIC NW LAB)

Ni-rich NMC (LiNixMnyCo1-x-yO2, x = 0.6) has the attributes of high specific capacity (greater than 180 mAh g-1), 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 rate or elevated temperatures. From thin film to densely pack high loading cathode, this work investigates the rate-limiting steps in Ni-rich cathodes 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 materials to relevant electrode levels.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1606201
• Report Number(s): PNNL-SA-150400
• Journal Information: Journal of Power Sources, Journal Name: Journal of Power Sources Vol. 454
• Country of Publication: United States
• Language: English