Dr. Jinshuo Zou, Dr. Gemeng Liang, Dr. Shilin Zhang, Dr. Lars Thomsen, Dr. Yameng Fan, Prof. Wei Kong Pang, Prof. Zaiping Guo, Prof. Vanessa K. Peterson
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引用次数: 0
Abstract
High-voltage spinel-type structured LiNi0.5Mn1.5O4 (LNMO) shows promise as a next-generation high-energy-density lithium-ion battery cathode material, however, capacity decay on extended cycling hinders its widespread adoption, underscoring an urgent need for further development. In this work, we introduce Zn at octahedral 16c crystal sites in LNMO with Fdm space group to improve rate capability and reduce the rapid capacity decay otherwise experienced during extended cycling. The current work resolves the detailed influence of isolated modification at octahedral 16c crystal sites, unveiling the mechanism for these performance improvements. We show that occupation of Zn at previously empty 16c sites prevents the migration of Ni/Mn to adjacent 16c sites, eliminating transformation to a rock-salt type structured Ni0.25Mn0.75O2 phase above 4.8 V, preventing structure degradation and suppressing voltage polarization. This study provides insights into the fundamental structure-function relationship of the LNMO battery cathode, pointing to pathways for the crystal structure engineering of materials with superior performance.
期刊介绍:
Electrochemical energy storage devices play a transformative role in our societies. They have allowed the emergence of portable electronics devices, have triggered the resurgence of electric transportation and constitute key components in smart power grids. Batteries & Supercaps publishes international high-impact experimental and theoretical research on the fundamentals and applications of electrochemical energy storage. We support the scientific community to advance energy efficiency and sustainability.