Highly stable iron-and manganese-based cathodes for long-lasting sodium rechargeable batteries

Title
Highly stable iron-and manganese-based cathodes for long-lasting sodium rechargeable batteries
Authors
홍지현김형섭윤갑인박인철박규영김종순이국승성낙언이성수강기석
Issue Date
2016-10
Publisher
Chemistry of materials
Citation
VOL 28, NO 20-7249
Abstract
The development of long-lasting and low-cost rechargeable batteries lies at the heart of the success of large-scale energy storage systems for various applications. Here, we introduce Fe- and Mn-based Na rechargeable battery cathodes that can stably cycle more than 3000 times. The new cathode is based on the solid-solution phases of Na4MnxFe3-x(PO4)(2)-(P2O7) (x = 1 or 2) that we successfully synthesized for the first time. Electrochemical analysis and ex situ structural investigation reveal that the electrodes operate via a one phase reaction upon charging and discharging with a remarkably low volume change of 2.1% for Na4MnFe2(PO4)(P2O7), which is one of the lowest values among Na battery cathodes reported thus far. With merits including an open framework structure and a small volume change, a stable cycle performance up to 3000 cycles can be achieved at 1C and room temperature, and almost 70% of the capacity at C/20 can be obtained at 20C. We believe that these materials are strong competitors for large-scale Na-ion battery cathodes based on their low costs, long-term cycle stability, and high energy density.
URI
http://pubs.kist.re.kr/handle/201004/72498
ISSN
0897-4756
Appears in Collections:
KIST Publication > Article
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