Amorphous Li-Zr-O layer coating on the surface of high-Ni cathode materials for lithium ion batteries. (20th August 2018)

• Record Type: Journal Article
• Authors: Lim, Young Jin; Lee, Sun-Me; Lim, Hayoung; Moon, Bora; Han, Kyu-Sung; Kim, Jin-Ho; Song, Jun-Ho; Yu, Ji-Sang; Cho, Woosuk; Park, Min-Sik
• Is Part Of: Electrochimica acta. Volume 282(2018)
• Page Start: 311
• Page End: 316
• Publication Date: 2018-08-20
• Subjects: Surface coating -- Layered transition metal oxide -- Cathode -- Lithium ion batteries -- Electrochemistry; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.06.062
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Improving cycle performance and rate-capability of lithium ion batteries is necessary in moving toward their use in electric vehicles. Working towards this goal, we propose an amorphous Li-Zr-O coating on the surface of a high-Ni layered transition metal oxide (LiNi0.8 Co0.1 Mn0.1 O2 ) via a simple wet process. By using residual Li on the surface of as-prepared LiNi0.8 Co0.1 Mn0.1 O2 particles as a Li source, a non-stoichiometric Li-Zr-O compound can be successfully formed on the surface of LiNi0.8 Co0.1 Mn0.1 O2 particles at a low temperature of 400 °C. The formation of an amorphous Li-Zr-O layer is beneficial in minimizing undesirable side reactions associated with residual Li at the surface and, by extension, improving the cycle performance and rate-capability of LiNi0.8 Co0.1 Mn0.1 O2 . The amorphous Li-Zr-O coated LiNi0.8 Co0.1 Mn0.1 O2 exhibits a high reversible capacity of more than 190 mAh g −1 with improved cycle performance. This simple approach offers easy control of the surface characteristics of LiNi0.8 Co0.1 Mn0.1 O2, improving the surface stability and enhancing the thermal stability. Graphical abstract: Amorphous Li-Zr-O coating layers can be uniformly formed on the surface of the particles, which is advantageous in providing suitable Li + pathways and improving structural stability. In this work, the residual Li on the surface of as-prepared LiNi0.8 Co0.1 Mn0.1 O2 particles can be partially utilized as a Li source for the formation of an amorphous Li-Zr-O coating layer during the coating process. Image 1 Highlights: A non-stoichiometric Li-Zr-O compound is introduced on the surface of NCM811 particles via a wet-process at a temperature of 400 °C. An amorphous Li-Zr-O layer is beneficial in minimizing undesirable side reactions associated with residual Li. The amorphous Li-Zr-O coated NCM811 exhibits a high reversible capacity of 190 mAh g −1 and stable cycle performance.