Rational Design of a Piezoelectric BaTiO3 Nanodot Surface‐Modified LiNi0.6Co0.2Mn0.2O2 Cathode Material for High‐Rate Lithium‐Ion Batteries. Issue 17 (8th September 2020)

• Record Type: Journal Article
• Authors: Wang, Wenzhi; Wu, Langyuan; Li, Zhiwei; Ma, Sen; Dou, Hui; Zhang, Xiaogang
• Is Part Of: ChemElectroChem. Volume 7:Issue 17(2020)
• Page Start: 3646
• Page End: 3652
• Publication Date: 2020-09-08
• Subjects: lithium-ion battery -- nickel-rich cathode -- surface modification -- piezoelectricity material -- high-rate performance; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202000750
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Nickel‐rich cathode materials have been regarded as the most promising candidates for lithium‐ion batteries because of their superior specific capacity and cost‐effectiveness. However, the rapid capacity fade under high current density and serious side reactions during long‐term cycling hinder its wide application. In this study, piezoelectric BaTiO3 nanodots are employed as a functional coating layer on the LiNi0.6 Co0.2 Mn0.2 O2 cathode material to balance the relationship between structure and performance. A three‐phase interface model is proposed including the LiNi0.6 Co0.2 Mn0.2 O2 cathode material, uniform piezoelectric BaTiO3 nanodots, and the electrolyte. The coating layer plays a key role in the rapid diffusion of lithium‐ions as well as stabilizing the bulk structure of the cathode materials. Furthermore, the possible by‐products generated during the electrochemical cycling that can be alleviated by the modification of BaTiO3 are detected by using differential electrochemical mass spectrometry. As expected, our strategy efficiently improves the structural stability and holds a high‐rate performance. Abstract : Nanodot interface modification : The effective and available employment of this method through piezoelectric BaTiO3 nanodot modification on the surface of LiNi0.6 Co0.2 Mn0.2 O2 cathode material in lithium‐ion batteries (LIBs) can enhance the diffusion coefficient of lithium ions among the cathode – BaTiO3 nanodot – electrolyte interfaces, alleviating the issue of the generation of CO2 gas in the high potential range, and maintaining the structural integrity in the bulk material upon long‐term electrochemical cycling.