Investigation of Structural Change and Electrochemical Reaction of Spinel-LiMn2O4 by Neutron Diffraction
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The structural change during electrochemical cycling in full-cell system has been investigated by neutron diffraction methodand the full-cell consists of spinel-lithium manganese oxide cathode and graphite anode. The structural variation has beenmonitored by in-situ neutron diffraction technique at different state of charges (SOCs), and the obtained data were comparedwith ex-situ powder neutron diffraction patterns. Phase transitions for lithiated/delithiated graphite can clearly explain thatthe intercalated lithium ions in graphite are not perfectly extracted during a delithiaion process. The content of LiC12 phaseincreases as an increase in electrochemical cycle numbers, and the lattice parameter of LiMn2O4 also decreases due to thereduction of the amounts of Li ions, which can be reversibly intercalated/deintercalated into/from the structure.
Abstract
The structural change during electrochemical cycling in full-cell system has been investigated by neutron diffraction methodand the full-cell consists of spinel-lithium manganese oxide cathode and graphite anode. The structural variation has beenmonitored by in-situ neutron diffraction technique at different state of charges (SOCs), and the obtained data were comparedwith ex-situ powder neutron diffraction patterns. Phase transitions for lithiated/delithiated graphite can clearly explain thatthe intercalated lithium ions in graphite are not perfectly extracted during a delithiaion process. The content of LiC12 phaseincreases as an increase in electrochemical cycle numbers, and the lattice parameter of LiMn2O4 also decreases due to thereduction of the amounts of Li ions, which can be reversibly intercalated/deintercalated into/from the structure.
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