锰
电池(电)
阴极
储能
电化学
体积热力学
电极
材料科学
化学工程
冶金
纳米技术
化学
功率(物理)
热力学
工程类
物理
物理化学
作者
Hyungsub Kim,Gabin Yoon,Inchul Park,Jihyun Hong,Kyu‐Young Park,Jongsoon Kim,Kug‐Seung Lee,Nark-Eon Sung,Seongsu Lee,Kisuk Kang
标识
DOI:10.1021/acs.chemmater.6b01766
摘要
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.
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