In-situ raman microscopy of individual LiNi0.8Co0.15Al0.05O2 particles in the Li-ion battery composite cathode
Kinetic characteristics of Li{sup +} intercalation/deintercalation into/from individual LiNi{sub 0.8}Co{sub 0.15}Al{sub 0.05}O{sub 2} particles in a composite cathode were studied in-situ using Raman microscopy during electrochemical charge-discharge in 1.2 M LiPF{sub 6}, ethylene carbonate (EC): ethyl-methyl carbonate (EMC), 3:7 by volume. Spectroscopic analysis of a cathode that was removed from a tested high-power Li-ion cell, which suffered substantial power and capacity loss, showed that the state of charge (SOC) of oxide particles on the cathode surface was highly non-uniform despite deep discharge of the Li-ion cell at the end of the test. In-situ monitoring of the SOC of selected oxide particles in the composite cathode in a sealed spectro-electrochemical cell revealed that the rate at which particles charge and discharge varied with time and location. The inconsistent kinetic behavior of individual oxide particles was attributed to degradation of the electronically conducting matrix in the composite cathode upon testing. These local micro-phenomena are responsible for the overall impedance rise of the cathode and contribute to the mechanism of lithium-ion cell failure.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of Basic Energy Sciences. Chemical Sciences Geosciences and Biosciences Division (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 840447
- Report Number(s):
- LBNL-56263; R&D Project: 478601; TRN: US200511%%56
- Journal Information:
- Journal of Physcial Chemistry, Vol. 109, Issue 2; Other Information: Submitted to Journal of Physical Chemistry: Volume 109, No.2; Journal Publication Date: 2005; PBD: 1 Oct 2004
- Country of Publication:
- United States
- Language:
- English
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