Time-dependent in-situ neutron diffraction investigation of a Li(Co0.16Mn1.84)O4 cathode

Authors

Neeraj Sharma, The Bragg Institute
m v. Reddy, National University of Singapore, Singapore
Guodong DuFollow
Stefan Adams, National University of Singapore, Singapore
B VR Chowdari, National University of Singapore, Singapore
Zaiping Guo, University of WollongongFollow
Vanessa K. Peterson, The Bragg Institute, KirraweeFollow

RIS ID

42831

Publication Details

Sharma, N., Reddy, m. v., Du, G., Adams, S., Chowdari, B. VR., Guo, Z. and Peterson, V. K. (2011). Time-dependent in-situ neutron diffraction investigation of a Li(Co_0.16Mn_1.84)O₄ cathode. The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces, 115 (43), 21473-21480.

Abstract

Real-time in-situ neutron diffraction data reveal for the first time that the Li(Co_0.16Mn_1.84)O₄ cathode undergoes current-free discharge. We find that current-free discharge occurs in a partially charged Li(Co_0.16Mn_1.84)O₄ cathode during its first charge cycle over a period of 11 h resulting in a 44(2)% expansion of the crystal lattice. The rate of change in the lattice parameter during the current-free discharge process is half the rate and more linear than for an applied-current discharge of −0.5 mA. The origins of current-free discharge are discussed along with the implications of nonequilibrium relaxation processes in in-situ neutron and X-ray diffraction studies. We show that the lattice does not return to the predischarge values after either current-applied or current-free discharge, indicating a limited ability for Li reinsertion (capacity loss) in partially charged Li(Co_0.16Mn_1.84)O₄ batteries.