Temperature-insensitive Fast Anion Intercalation Kinetics in Graphite Electrodes for Aluminum-ion Batteries
Temperature-insensitive Fast Anion Intercalation Kinetics in Graphite Electrodes for Aluminum-ion Batteries
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DOI：
10.1016/j.electacta.2022.140892
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发表时间：
2022-07
影响因子：
6.6
通讯作者：
Shubha Agrawal;Nick Matteucci;Bingyuan Ma;Jiayi Wu;Rochit Sinha;P. Bai
中科院分区：
文献类型：
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作者：
Shubha Agrawal;Nick Matteucci;Bingyuan Ma;Jiayi Wu;Rochit Sinha;P. Bai
锂离子电池（LIB）由于其整体高性能而统治着当今的储能市场，然而，在低于-10 °C的温度下会严重恶化。新兴的铝离子电池（AIB）与LIB不同，可以在低至-30 °C的低温下提供更高的可逆容量。在这里，我们使用经典的电分析方法在-20 °C和室温之间选择的五个温度下对AIB进行系统的电化学表征，以评估基本动力学。在推广的模型下，得到了扩散系数在10 − 9 - 10 − 7 cm 2 s − 1范围内的变化，速率限制机制从室温下的混合控制转变为-20 °C下的扩散控制.进一步的独立阻抗分析显示，在低温下，AIB中的阻抗增加比LIB中的阻抗增加少得多。温度不敏感的快速动力学可以归因于活性物种在电极表面附近的内亥姆霍兹平面处的高可用性和容易获得。这里的结果揭示了在宽温度范围内促进AIB高性能的管理机制，并证明了电解质优化的必要性，重点是双电层结构的内亥姆霍兹平面，以确保在低温下的高倍率电极性能。
Lithium-ion batteries (LIBs) rule today's energy storage market owing to their overall high performance, which, however, deteriorate severely at temperatures below -10°C. Emerging aluminum-ion batteries (AIBs), unlike LIBs, can deliver higher reversible capacities at low temperatures down to even -30°C. Here, we perform a systematic electrochemical characterization of the AIBs using classical electroanalytical methods at five temperatures selected between -20°C and room temperature, to assess the fundamental kinetics. With a generalized model, we obtained diffusion coefficients in the range of10−9– 10−7cm2s−1, and the rate-limiting mechanism shifts from mixed-control at room temperature to diffusion-control at -20°C. Further independent impedance analysis reveals a much less severe increase in the impedance in AIBs than those in LIBs, at low temperatures. The temperature-insensitive fast kinetics can be attributed to the high availability and easy access of active species at the inner Helmholtz plane near the electrode surface. The results here shed light on the governing mechanisms facilitating the high performance of AIBs in a wide temperature range and demonstrate the necessity of electrolyte optimization with a focus on the inner Helmholtz plane of the electric double layer structure to ensure high-rate electrode performance at low temperatures.