Diagnostic Evaluation of Detrimental Phenomena in High-PowerLithium-Ion Batteries
A pouch-type lithium-ion cell, with graphite anode and LiNi{sub 0.8}Co{sub 0.15}Al{sub 0.05}O{sub 2} cathode, was cycled at C/2 over 100% depth of discharge (DOD) at ambient temperature. The LiNi{sub 0.8}Co{sub 0.15}Al{sub 0.05}O{sub 2} composite cathode was primarily responsible for the significant impedance rise and capacity fade observed in that cell. The processes that led to this impedance rise were assessed by investigating the cathode surface electronic conductance, surface structure, composition, and state of charge at the microscopic level with the use of local probe techniques. Raman microscopy mapping of the cathode surface provided evidence that the state of charge of individual LiNi{sub 0.8}Co{sub 0.15}Al{sub 0.05}O{sub 2} particles was non-uniform despite the deep discharge at the end of cell testing. Current-sensing atomic force microscopy imaging revealed that the cathode surface electronic conductance diminished significantly in the tested cells. Loss of contact of active material particles with the carbon matrix and thin film formation via electrolyte decomposition not only led to LiNi{sub 0.8}Co{sub 0.15}Al{sub 0.05}O{sub 2} particle isolation and contributed to cathode interfacial charge-transfer impedance but also accounted for the observed cell power and capacity loss.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE. Assistant Secretary for Energy Efficiency andRenewable Energy. Office of the FreedomCAR and Vehicle TechnologiesProgram, Office of Basic Energy Sciences. Chemical Sciences Geosciencesand Biosciences Division
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 903039
- Report Number(s):
- LBNL-59195; R&D Project: 477603; BnR: VT0301030; TRN: US200718%%363
- Journal Information:
- The Electrochemical Society, Inc., Vol. 153, Issue 4; Related Information: Journal Publication Date: 2006
- Country of Publication:
- United States
- Language:
- English
Similar Records
In-situ raman microscopy of individual LiNi0.8Co0.15Al0.05O2 particles in the Li-ion battery composite cathode
Characterization of high-power lithium-ion cells during constant current cycling. Part I. Cycle performance and electrochemical diagnostics