P2-type Na 2/3 Ni 1/3Mn 2/3O 2 Cathode Material with Excellent Rate and Cycling Performance for Sodium-Ion Batteries

Date Published
12/2019
Publication Type
Journal Article
Authors
DOI
10.1149/2.0211916jes
Abstract

P2-type Na2/3Ni1/3Mn2/3O2 is an air-stable cathode material for sodium-ion batteries. However, it suffers irreversible P2-O2 phase transition in 4.2-V plateau and shows poor cycling stability and rate capability within this plateau. To evaluate the practicability of this material in 2.3–4.1 V voltage range, single-crystal micro-sized P2-type Na2/3Ni1/3Mn2/3O2 with high rate capability and cycling stability is synthesized via polyvinylpyrrolidone (PVP)-combustion method. The electrochemical performance is evaluated by galvanostatic charge-discharge tests. The kinetics of Na+ intercalation/deintercalation is studied detailly with potential intermittent titration technique (PITT), galvanostatic intermittent titration technique (GITT) and cyclic voltammetry (CV). The discharge capacity at 0.1 C in 2.3–4.1 V is 87.6 mAh g−1. It can deliver 91.5% capacity at 40 C rate and keep 89% after 650 cycles at 5C. The calculated theoretical energy density of full cell with hard carbon anode is 210 Wh kg−1. The moderate energy density associated with high power density and long cycle life is acceptable for load adjustment of new-energy power, showing the prospect of practical application.

Journal
Journal of The Electrochemical Society
Volume
166
Year of Publication
2019
Issue
16
Pagination
A3980 - A3986
ISSN Number
0013-4651
Short Title
J. Electrochem. Soc.
Refereed Designation
Refereed
Organizations
Research Areas
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