Affiliation:
1. Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China
Abstract
AbstractNickel (Ni)‐rich cathode materials use a high abundance of Ni instead of Cobalt (Co) while increasing battery voltage, making them the representative materials for developing high‐energy‐density batteries. However, Ni‐rich batteries are prone to Ni leaching and performance deterioration; stable cycling thus requires strict control of the H2O/HF content in the electrolyte. Here, the use of an emerging H2O capture metal–organic framework (MOF) is reported to realize stable cycling of Ni‐rich batteries with H2O‐containing electrolytes. The MOF‐801 separator enables NCM622 and even NCM811 batteries containing electrolyte solutions with a 300 ppm H2O content to maintain 91.4% and 81% of the initial capacities after 200 cycles at 0.2 C. Moreover, MOF‐801 is found to significantly suppress fragmentation of the cathode, Li–Ni intermixing, and Ni dissolution. Additionally, the MOF‐801@PP based separator can largely inhibit the lithium dendrite. The results reveal the pivotal role of MOF‐801 in high‐energy‐density batteries, inspiring in‐depth exploration of MOF's indispensable application in lithium batteries.
Funder
National Natural Science Foundation of China
Ministry of Science and Technology of the People's Republic of China
Tsinghua Initiative Scientific Research Program
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials