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首页> 外文期刊>Advanced energy materials >Long Cycle Life, Low Self-Discharge Sodium-Selenium Batteries with High Selenium Loading and Suppressed Polyselenide Shuttling
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Long Cycle Life, Low Self-Discharge Sodium-Selenium Batteries with High Selenium Loading and Suppressed Polyselenide Shuttling

机译：长周期寿命，低自放电钠硒电池，高硒负载和抑制的多硫化物梭动

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摘要

The use of selenium as a cathode in rechargeable sodium-selenium batteries is hampered by low Se loading, inferior electrode kinetics, and polyselenide shuttling between the cathode and anode. Here a high-performance sodium-selenium cell is presented by coupling a binder-free, self-interwoven carbon nanofiber-selenium cathode with a light-weight carbon-coated bifunctional separator. With this strategy, electrodes with a high Se mass loading (4.4 mg cm(-2)) render high reversible capacities of 599 mA h g(-1) at 0.1C rate and 382 mA h g(-1) at 5C rate. In addition, this novel cell offers good shelf-life with a low self-discharge, retaining 93.4% of its initial capacity even after resting for six months. As evidenced by experimental and density functional theory analysis, the remarkable dynamic (cycle life) and static (shelf-life) stabilities originate from the high electrical conductivity, improved Na-ion accessibility through the 3D interconnected open channels, and highly restrained polyselenide shuttle. The results demonstrate the viability of high-performance sodium-selenium batteries with high selenium loading.
机译：低硒含量，低劣的电极动力学以及阴极和阳极之间的聚硒化物穿梭阻碍了硒在可充电钠硒电池中作为阴极的使用。在这里，通过将无粘合剂，自交织的碳纳米纤维-硒阴极与轻巧的碳涂层双功能隔膜耦合在一起，从而形成了高性能的钠-硒电池。通过这种策略，具有高Se质量负载（4.4 mg cm（-2））的电极在0.1C速率下具有599 mA h g（-1）的高可逆容量，在5C速率下具有382 mA h g（-1）的高可逆容量。此外，这种新颖的电池具有良好的保质期和低的自放电性，即使静置六个月也能保持其93.4％的初始容量。正如实验和密度泛函理论分析所证明的那样，出色的动态（循环寿命）和静态（保质期）稳定性源于高电导率，通过3D互连开放通道改善的Na离子可及性以及高度受限的聚硒化物穿梭。结果证明了高硒含量的高性能钠硒电池的可行性。

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