Preparation and electrochemical properties of LiAlO sub(2)-coated Li(Ni sub(1/3)Mn sub(1/3)Co sub(1/3))O sub(2) for all-solid-state batteries

• Published in: Solid state ionics 2014-01, Vol.255, p.120-127
• Main Authors: Okada, Kazuya, Machida, Nobuya, Naito, Muneyuki, Shigematsu, Toshihiko, Ito, Seitaro, Fujiki, Satoshi, Nakano, Masatugu, Aihara, Yuichi
• Format: Article
• Language: English
• Subjects: Cycles; Discharge; Electric batteries; Electrode materials; Lithium batteries; Retarding; Solid electrolytes; Sulfides
• ISSN: 0167-2738
• DOI: 10.1016/j.ssi.2013.12.019

LiAlO sub(2)-coated LiNi sub(1/3)Mn sub(1/3)Co sub(1/3)O sub(2) powders were prepared by a sol-gel method associated with ultra-sonication, and the obtained LiAlO sub(2)-coated LiNi sub(1/3)Mn sub(1/3)Co sub(1/3)O sub(2) was investigated as positive electrode materials for all-solid-state batteries with sulfide-based solid electrolytes. All-solid-state lithium batteries were assembled with the obtained LiAlO sub(2)-coated LiNi sub(1/3)Mn sub(1/3)Co sub(1/3)O sub(2) powders and with amorphous Li sub(3)PS sub(4) as solid electrolytes. The charge-discharge cycle performance of the all-solid-state cells was improved by the LiAlO sub(2)-coating on LiNi sub(1/3)Mn sub(1/3)Co sub(1/3)O sub(2) powders. The LiAlO sub(2) coating was effective in suppressing an increasing of the interfacial resistance between the LiNi sub(1/3)Mn sub(1/3)Co sub(1/3)O sub(2) electrode material and the sulfide based solid electrolyte, Li sub(3)PS sub(4), during charge-discharge cycling. The battery with the 1.0 mol% LiAlO sub(2)-coated LiNi sub(1/3)Mn sub(1/3)Co sub(1/3)O sub(2) showed an initial discharge capacity of 134 mAhg super(-1) and the battery retained the capacity more than 124 mAhg super(-1) even after 400 charge-discharge cycles at a current density of 11 mAg super(-1) at room temperature.