电解质
材料科学
离子电导率
化学工程
电池(电)
电极
聚合物
复合数
阴极
复合材料
电导率
化学
物理
工程类
量子力学
物理化学
功率(物理)
作者
Suli Chen,Haiying Che,Fei Feng,Jingping Liao,Hong Wang,Yi Yin,Zhenqiang Ma
标识
DOI:10.1021/acsami.9b11259
摘要
Solid-state rechargeable batteries using polymer electrolytes have been considered, which can avoid safety issues and enhance energy density. However, commercial application of the polymer electrolyte solid-state battery is still significantly limited by the low room-temperature ionic conductivity, poor mechanical properties, and weak interfacial compatibility between the electrolyte and electrode, especially for the room-temperature solid-state rechargeable battery. In this work, a poly(vinylene carbonate)-based composite polymer electrolyte (PVC-CPE) is reported for the first time to realize room-temperature solid-state sodium batteries with high performances. This in situ solidified PVC-CPE possesses superior ionic conductivity (0.12 mS cm–1 at 25 °C), high Na+ transference number (tNa+ = 0.60), as well as enhanced electrode/electrolyte interfacial stability. Notably, the composite cathode NaNi1/3Fe1/3Mn1/3O2 (c-NFM) is designed through the in situ growth of the polymer electrolyte inside the electrode to decrease interfacial resistance and facilitate effective ion transport in electrode/electrolyte interfaces. It is demonstrated that the solid-state c-NFM/PVC-CPE/Na battery assembled by a one-step in situ solidification method exhibits remarkably enhanced cell performances at room temperature compared with a reference NFM/PVC-CPE/Na assembled through a conventional ex situ method. The battery presents a high initial specific capacity of 104.2 mA h g–1 at 0.2 C with a capacity retention of 86.8% over 250 cycles and ∼80.2 mA h g–1 at 1 C. This study suggests that PVC-CPE is a very promising electrolyte for solid-state sodium batteries. This study also suggests a new method to design high-performance polymer electrolytes for other solid-state rechargeable batteries to realize high safety and considerable electrochemical performance at room temperature.
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