High voltage LIB cathodes enabled by salt-reinforced liquid electrolytes

Journal Article · Sun Feb 01 00:00:00 EST 2015 · Electrochemistry Communications

DOI:https://doi.org/10.1016/j.elecom.2014.11.010· OSTI ID:1370422

Lu, Yingying; Xu, Shaomao; Shu, Jonathan; Aladat, Wajdi Issam A.; Archer, Lynden A.

We report on electrochemical properties of Li/Li_1.2Ni_0.15Co_0.1Mn_0.55O₂ secondary batteries in electrolytes designed to stabilize electrodeposition of lithium. Ethylene carbonate (EC): dimethyl carbonate (DMC) containing a LiPF6/LiF salt blend stabilizes lithium electrodeposition and enables Li/Li_1.2Ni_0.15Co_0.1Mn_0.55O₂ batteries with a high discharge capacity of 270 mAh·g^{- 1} at 0.05 mA cm^{- 2}. Cells containing the LiF-reinforced electrolytes also exhibit excellent capacity retention over 500 cycles with Columbic efficiencies approaching 100%. Post-mortem SEM analysis of the lithium anode shows more compact deposition in the presence of the LiF salt additive, while XPS depth profile analysis of cathodes show a more uniform distribution of Mn over the first 180 nm from the electrode/electrolyte interface. The results imply that LiF reinforced electrolytes simultaneously facilitate stable lithium electrodeposition and reduce Mn dissolution.

• Research Organization: Energy Frontier Research Centers (EFRC) (United States). Energy Materials Center at Cornell (EMC2)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• DOE Contract Number: SC0001086
• OSTI ID: 1370422
• Journal Information: Electrochemistry Communications, Vol. 51, Issue C; Related Information: Emc2 partners with Cornell University (lead); Lawrence Berkeley National Laboratory; ISSN 1388-2481
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
Lithium-ion batteryHigh voltage cathodeLithium fluoride