Haichen Lin, Wei-Tao Peng, Zishen Wang, Jan Hofmann, Simon M. Vornholt, Haodong Liu, Shen Wang, John Holoubek, Ke Zhou, Qiushi Miao, Steven Huber, Karena W. Chapman*, Shyue Ping Ong* and Ping Liu*,
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Increasing the Energy Density of Disordered Rock Salt Anodes for Fast-Charging Lithium-Ion Batteries
Transition-metal oxides (TMOs) are promising anode materials for safe and fast-charging batteries, but their high operating potentials limit energy density. Here, we develop a strategy to suppress the operating potential of the disordered rock salt (DRS) Li3V2O5 (LVO) anode by ∼10% to 0.54 V via Mg doping. Density functional theory (DFT) calculations attribute this voltage reduction to increased site energy of Li ions because of Mg doping, with minimal impact on Li migration barriers. Mg-doped LVO retains over 95% of its capacity over 1000 cycles at a rate of 5 C. Full cells with a LiNi0.8Co0.1Mn0.1O2 cathode demonstrate the expected increase in cell voltage and energy density while retaining 91% of their capacity over 250 cycles at 5 C. Our findings show that Mg doping provides a promising pathway for designing fast-charging, long-cycle-life anode materials with enhanced energy density.
期刊介绍：
ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.
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