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Monitoring the phase evolution in LiCoO2 electrodes during battery cycles using in-situ neutron diffraction technique

Journal Article


Abstract


  • LiCoO2 (LCO) with average particle distribution of 8 ��m (LCO-A) and 11 ��m (LCO-B) exhibit substantial differences in cycle performance. The half-cells have similar first-cycle discharge capacities of 173 and 175 mAh/g at 0.25 C, but after 100 cycles, the discharge capacities are substantially different, that is, 114 and 141 mAh/g for LCO-A and LCO-B, respectively. Operando neutron powder diffraction of full LCO||Li4Ti5O12 batteries show differences in the LCO reaction mechanism underpinning the electrochemical behavior. LCO-A follows a purely solid solution reaction during cycling compared to the solid solution and two-phase reaction mechanism in LCO-B. The absence of the two-phase reaction in LCO-A is consistent with a homogeneous distribution of Li throughout the particle. The two-phase reaction in LCO-B reflects two distinguishable distributions of Li within the particles. The faster capacity decay in LCO-A is correlated to an increase in electrode cracking during battery cycles.

Publication Date


  • 2020

Citation


  • Jena, A., Lee, P. H., Pang, W. K., Hsiao, K. C., Peterson, V. K., Darwish, T., . . . Liu, R. S. (2020). Monitoring the phase evolution in LiCoO2 electrodes during battery cycles using in-situ neutron diffraction technique. Journal of the Chinese Chemical Society, 67(3), 344-352. doi:10.1002/jccs.201900448

Scopus Eid


  • 2-s2.0-85076087382

Start Page


  • 344

End Page


  • 352

Volume


  • 67

Issue


  • 3

Place Of Publication


Abstract


  • LiCoO2 (LCO) with average particle distribution of 8 ��m (LCO-A) and 11 ��m (LCO-B) exhibit substantial differences in cycle performance. The half-cells have similar first-cycle discharge capacities of 173 and 175 mAh/g at 0.25 C, but after 100 cycles, the discharge capacities are substantially different, that is, 114 and 141 mAh/g for LCO-A and LCO-B, respectively. Operando neutron powder diffraction of full LCO||Li4Ti5O12 batteries show differences in the LCO reaction mechanism underpinning the electrochemical behavior. LCO-A follows a purely solid solution reaction during cycling compared to the solid solution and two-phase reaction mechanism in LCO-B. The absence of the two-phase reaction in LCO-A is consistent with a homogeneous distribution of Li throughout the particle. The two-phase reaction in LCO-B reflects two distinguishable distributions of Li within the particles. The faster capacity decay in LCO-A is correlated to an increase in electrode cracking during battery cycles.

Publication Date


  • 2020

Citation


  • Jena, A., Lee, P. H., Pang, W. K., Hsiao, K. C., Peterson, V. K., Darwish, T., . . . Liu, R. S. (2020). Monitoring the phase evolution in LiCoO2 electrodes during battery cycles using in-situ neutron diffraction technique. Journal of the Chinese Chemical Society, 67(3), 344-352. doi:10.1002/jccs.201900448

Scopus Eid


  • 2-s2.0-85076087382

Start Page


  • 344

End Page


  • 352

Volume


  • 67

Issue


  • 3

Place Of Publication