(PO4)3− polyanions doped LiNi1/3Co1/3Mn1/3O2: An ultrafast-rate, long-life and high-voltage cathode material for Li-ion rechargeable batteries. (20th May 2016)

• Record Type: Journal Article
• Authors: Cong, Lina; Zhao, Qin; Wang, Zhao; Zhang, Yuhang; Wu, Xinglong; Zhang, Jingping; Wang, Rongshun; Xie, Haiming; Sun, Liqun
• Is Part Of: Electrochimica acta. Volume 201(2016)
• Page Start: 8
• Page End: 19
• Publication Date: 2016-05-20
• Subjects: Lithium ion battery -- LiNi1/3Co1/3Mn1/3O2 -- (PO4)3− polyanions doping -- Stepwise pre-cycling treatment; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.03.088
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: LiNi1/3 Co1/3 Mn1/3 O2 layered structure is doped with (PO4 ) 3− polyanions. Results confirm that (PO4 ) 3− influences MO6 octahedral environment in LiNi1/3 Co1/3 Mn1/3 O2 lattice. Charge–discharge properties are investigated under high voltage battery operation. Cycling and rate performance of the doped materials is markedly enhanced. Pre-cycling treatment inhibits microcracks at the grain boundaries at 4.7–2.8 V. Abstract: Layered compounds LiNi1/3 Co1/3 Mn1/3 O2 have recently received much attention as they have been regarded as a promising cathode materials for industrial application. However, its fast energy density decay and poor rate performance which originate from structure disruption especially at high rate and high cut-off voltage limit its large-scale application. Here, a novel designed concept and facile method were firstly used to fabricate (PO4 ) 3− polyanions doped layered LiNi1/3 Co1/3 Mn1/3 O2 (LNMC-(PO4 )0.015 -O1.94 ) structure, which could offer more stable high-voltage cycling performance and high rate capability. We attribute this improved performance to the robust Ptet -O covalence, which will stabilize the oxygen close-packed structure during repeated cycling. Moreover, our stepwise pre-cycling treatments could effectively restrain the formation of micro-cracks and non-crystallization defects, and significantly improve cyclic durability with high charge voltage of 4.7V. The LNMC-(PO4 )0.015 -O1.94 electrode can still delivers capacity retention of 81% after 200 cycles at a current density of 300mA g −1 . The preliminary results reported here manifest that this novel-designed LNMC-(PO4 )0.015 -O1.94 material represents an attractive alternative to ultrafast-rate, long-life and high-voltage electrode material for lithium ion batteries.