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

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.0211916jes· OSTI ID:1576698

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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
AC02-05CH11231; 001802003
OSTI ID:
1576698
Alternate ID(s):
OSTI ID: 1601199
Journal Information:
Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Vol. 166 Journal Issue: 16; ISSN 0013-4651
Publisher:
IOP Publishing - The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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