Electrochemical Properties of Li1+xCoO2 Synthesized for All-Solid-State Lithium Ion Batteries with Li2S-P2S5 Glass-Ceramics Electrolyte. Issue 6 (1st January 2015)

• Record Type: Journal Article
• Authors: Kim, Junghoon; Kim, Oosup; Park, Chanhwi; Lee, Giho; Shin, Dongwook
• Is Part Of: Journal of the Electrochemical Society. Volume 162:Issue 6(2015)
• Page Start: A1041
• Page End: A1045
• Publication Date: 2015-01-01
• Subjects: All-solid-state lithium ion battery -- Sulfide solid electrolyte -- Transition metal oxide; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1051506jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The over-stoichiometric Li1+x CoO2 (x = 0.1, 0.2, and 0.3) cathode materials were synthesized from an aqueous solution of lithium nitrate (LiNO3 ) as an excess lithium precursor and their effects on the electrochemical properties of all-solid-state lithium batteries employing Li2 S-P2 S5 glass-ceramics solid electrolytes are investigated. A combination of X-ray diffraction, Fourier transform infrared spectroscopy, and inductively coupled plasma atomic emission spectroscopy reveals that the excess lithium forms a residual Li2 CO3 layer on the surface of as-prepared Li1+x CoO2 particles during the synthesis process. While regarded as an impurity phase in lithium battery systems using liquid electrolytes due to its detrimental effects on electrochemical performance, the Li2 CO3 formed on the surface of the over-stoichiometric Li1+x CoO2 powders is identified in all-solid-state lithium battery systems using sulfide solid electrolytes to act as an effective coating material to suppress the interfacial side reactions despite its low ionic and electronic conductivity.