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首页> 美国卫生研究院文献>Advanced Science >Low‐Temperature Charge/Discharge of Rechargeable Battery Realized by Intercalation Pseudocapacitive Behavior
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Low‐Temperature Charge/Discharge of Rechargeable Battery Realized by Intercalation Pseudocapacitive Behavior

机译：通过插层伪电容行为实现可充电电池的低温充放电

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摘要

Conventional intercalation compounds for lithium‐ion batteries (LIBs) suffer from rapid capacity fading and are even unable to charge–discharge with temperature decline, owing to the sluggish kinetics and solvation/desolvation process. In this work, a high‐performance rechargeable battery at ultralow temperature is developed by employing a nanosized Ni‐based Prussian blue (NiHCF) cathode. The battery delivers a high capacity retention of 89% (low temperature of −50 °C) and 82% (ultralow temperature of −70 °C) compared with that at +25 °C. Various characterizations and electrochemical investigations, including operando Fourier transform infrared spectra, in situ X‐ray diffraction, cyclic voltammetry response, and galvanostatic intermittent titration technique are carried out to detect the structural stability and electrochemical behavior at different temperatures. It turns out that the pseudocapacitive behavior drives the desolvation process at the interface, while fast diffusion in the bulk electrode accelerates the movement of Li from the interface to the bulk materials. The unique synergistic features of intercalation pseudocapacitance at the electrolyte/electrode interface and high diffusion coefficient in the bulk electrode enables the NiHCF cathode with excellent low temperature performance. These findings offer a new direction for the design of LIBs operated at low temperature.
机译：锂离子电池（LIB）的常规插层化合物会因容量动力学缓慢和溶剂化/去溶剂化过程而迅速褪色，甚至无法随温度下降而充放电。在这项工作中，通过使用纳米尺寸的镍基普鲁士蓝（NiHCF）阴极，开发了一种超低温高性能充电电池。与+ 25°C相比，该电池具有89％（低温-50°C的低温）和82％（超低温的-70°C）的高容量保持率。进行了各种表征和电化学研究，包括操作傅立叶变换红外光谱，原位X射线衍射，循环伏安法响应和恒电流间歇滴定技术，以检测不同温度下的结构稳定性和电化学行为。事实证明，伪电容行为驱动界面处的去溶剂化过程，而块状电极中的快速扩散加速了Li从界面向块状材料的移动。电解质/电极界面上的插入伪电容的独特协同特征以及体电极中的高扩散系数使NiHCF阴极具有出色的低温性能。这些发现为低温下的LIB设计提供了新的方向。

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