1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China 2University of Chinese Academy of Sciences, Beijing 100049, China 3College of Chemistry and Molecular Sciences, Hubei Key Laboratory of Electrochemical Power Sources, Wuhan University, Wuhan 430072, China
Abstract：Lithium deposition on graphite electrode not only reduces fast-charging capability of lithium ion batteries but also causes safety trouble. Here, a low-field $^{7}$Li dynamic nuclear polarization (DNP) is used to probe Li plating on the surfaces of three types of carbon electrodes: hard carbon, soft carbon and graphite. Owing to the strong Fermi contact interaction between $^{7}$Li and conduction electrons, the $^{7}$Li nuclear-magnetic-resonance (NMR) signal of Li metal deposited on electrode surface could be selectively enhanced by DNP. It is suggested that low-field $^{7}$Li DNP spectroscopy is a sensitive tool for investigating Li deposition on electrodes during charging/discharging processes.
Gauthier M, Carney T J, Grimaud A, Giordano L, Pour N, Chang H H, Fenning D P, Lux S F, Paschos O, Bauer C, Maglia F, Lupart S, Lamp P, and Shao-Horn Y 2015 J. Phys. Chem. Lett.6 4653
Rosay M, Tometich L, Pawsey S, Bader R, Schauwecker R, Blank M, Borchard P M, Cauffman S R, Felch K L, Weber R T, Temkin R J, Griffin R G, and Maas W E 2010 Phys. Chem. Chem. Phys.12 5850
2021, Vol. 38 
