journal article·2024-11-20

Monitoring LiNixCoyMn(1–x–y)O2 Degradation in Contact with Li via In Situ Transmission Electron Microscopy

Min Liu, Qiang Li, Kaifeng Chen, Wenting Luo, Yi Chen, Pengfei Yan, Qi Chen, Liang Qiao, Li Zhong, Liwei Chen, Litao Sun

ACS Applied Materials & Interfaces· Volume 16· Issue 46
Publisher page

Abstract

High-voltage LiNi x Co y Mn (1– x – y ) O 2 (NCM) is one of the most promising cathode materials for high-energy-density lithium metal batteries. Significant efforts have been made on inhibiting the surface transition of NCM from the ordered layered phase to the low-ionic-conductivity rock salt phase, which facilitates maintaining a low interfacial impedance for superior cycle performance. However, it is often overlooked that the surface rock salt phase also has a low electronic conductivity, which may alleviate the notorious growth of lithium dendrite-induced short-circuit. In this article, we further demonstrate that the surface rock salt phase of NCM is effective in resisting pulverization from contact with Li via in situ transmission electron microscopy. The ordered layered NCM experiences rapid overlithiation in contact with Li, which triggers lattice expansion and pulverization. The overlithiation-induced degradation is retarded for NCM with the Li-deficient disorder rock salt phase on the surface, which is attributed to the blocked Li + primary path. Our work revisits the unwanted surface rock salt phase of ordered layer cathodes, which provides a guideline for interface design for long-cycling and high-safety lithium batteries.
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Research context

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced Battery Technologies Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, School of Integrated Circuits, Southeast University, Nanjing 210096, China

I-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China

School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China

Beijing Key Laboratory of Microstructure and Property of Solids, College of Materials Science & Engineering, Beijing University of Technology, Beijing 100124, China

School of Chemistry and Chemical Engineering, In Situ Center for Physical Sciences, Shanghai Electrochemical Energy Device Research Center, Global Institute of Future Technology, and Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China

Funding

National Key Research and Development Program of China · Natural Science Foundation of Jiangsu Province · Fundamental Research Funds for the Central Universities · National Natural Science Foundation of China · Science and Technology Program of Suzhou · Chinese Academy of Sciences

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