Researchers at the University of Maryland (UMD) led by Chunsheng Wang – a professor with joint appointments in the Departments of Chemical & Biomolecular Engineering (ChBE), and Chemistry & Biochemistry – have developed a highly reversible 5.3 V battery offering a Mn3+-free LiCoMnO4 cathode, and graphite and Li-metal anodes.
A specially designed electrolyte was also created, which is stable to 5.5V for both the LiCoMnO4 cathode and (graphite and Li-metal) anodes. This resulted in a 5.3V Li-metal cell, delivering a high energy density of 720Wh/kg for 1k cycles. What’s more, this battery chemistry boasts a Coulombic efficiency of >99%, offering new development opportunity for high-voltage and energy Li-ion batteries.
Long Chen – a ChBE post-doctoral research associate – and Xiulin Fan – a ChBE assistant research scientist – served as first authors on the corresponding research paper, published in Chem on February 28, 2019.
“We are pleased to announce that we have created a stable 5.3V battery,” said Long Chen. “The key is the super electrolytes with an especially wide electrochemical window of 0 – 5.5V – this is due to the formation of robust interfacial layer on the electrodes.”
Said Wang, “The high voltage electrolytes enable us to use high voltage cathode and high capacity Si- and potential Li-metal anodes, which will significantly increase the cell energy density. However, the Coulombic efficiency of >99% for 5.3V LiCoMnO4 still needs improvement to achieve a long cycle life.”
For additional information:
Chen, L., Fa, X., Hu, E., Ji, X., Chen, J., HouS., Deng, T., Li, J., Su, D., Yang, X., Wang, C. “Achieving High Energy Density through Increasing the Output Voltage: A Highly Reversible 5.3 V Battery.” Chem, 28 February 2019. https://doi.org/10.1016/j.chempr.2019.02.003
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