Intrinsic Surface Stability in LiMn2-xNixO4-d (x=0.45, 0.5) High Volt-age Spinel Materials for Lithium Ion Batteries

Journal Article · Sun Jan 01 00:00:00 EST 2012 · Electrochemical and Solid-State Letters

DOI:https://doi.org/10.1149/2.008206esl· OSTI ID:1037033

Carroll, Kyler J ^[1]; Yang, Ming-Che ^[2]; Veith, Gabriel M ^[3]; Dudney, Nancy J ^[3]; Meng, Ying Shirley ^[1]

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1. University of California, San Diego
2. University of Florida, Gainesville
3. ORNL

This work reports the surface stability of the high voltage Li ion cathode LiMn2-xNixO4- (x= 0.5, 0.45) by comparing thin film and powder composite electrodes after cycling using X-ray photoelectron spectroscopy. The thin film electrodes offer the ability to probe the surface of the material without the need of a conductive agent and polymer binder typically used in composite electrodes. The results suggest that neither oxidation of PF6 to POF5 nor the decomposition of ethylene carbonate or dimethylene carbonate occurs on the surface of the spinel material. These results confirm the enhanced cycling stability and rate capability associated with the high voltage spinel material and suggests that the SEI layer forms due to the reaction of electrochemically inactive components in composite electrodes with the electrolyte.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1037033
• Journal Information: Electrochemical and Solid-State Letters, Vol. 15, Issue 5; ISSN 1099-0062
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
BINDERS
CARBONATES
CATHODES
ELECTRODES
ETHYLENE
LITHIUM IONS
OXIDATION
POLYMERS
PROBES
SPINELS
STABILITY
THIN FILMS
X-RAY PHOTOELECTRON SPECTROSCOPY
ELECTRIC BATTERIES