Enhanced cyclic stability at elevated temperature of spinel LiNi0.5Mn1.5O4 by Li4Ti5O12 coating as cathode material for high voltage lithium ion batteries. Issue 4 (March 2019)

• Record Type: Journal Article
• Authors: Wu, Qiang; Xue, Ke; Zhang, Xiaohui; Xie, Xuesong; Wang, Hongqiang; Zhang, Jiujun; Li, Qingyu
• Is Part Of: Ceramics international. Volume 45:Issue 4(2019)
• Page Start: 5072
• Page End: 5079
• Publication Date: 2019-03
• Subjects: Lithium ion batteries -- High voltage cathode -- LiNi0.5Mn1.5O4 -- Surface modification; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.11.209
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The cyclic stability of LiNi0.5 Mn1.5 O4 at elevated temperature is a crucial factor for commercial Li-ion batteries. To improve the capacity retention of the spinel cathode material, surface modification has been widely recognized as one of the most effective approaches. In this work, a continuous and uniform layer assembled with nanoscale Li4 Ti5 O12 particles was coated on LiNi0.5 Mn1.5 O4 via hydrothermal method with moderate temperature. With a coating quantity of 0.5 wt%, the as-prepared LiNi0.5 Mn1.5 O4 @ Li4 Ti5 O12 delivers an initial special discharge capacity of 141.2 mAh g −1 at 0.2 C and retention of 93.66% after 500 cycles at 1 C at room temperature, and it exhibits capacity retention of 97.03% after 140 cycles at 1 C at 55 °C. In addition to the protective effect against electrolyte, from observation on the surface feature during long term lithium insertion/extraction process, the Li4 Ti5 O12 coating layer suppresses the continuous growth of a dense and cathode electrolyte interfaces from the electrolyte decomposition.