Na2S in-situ infiltrated in actived carbon as high-efficiency presodiation additives for sodium ion hybrid capacitors

Mengfan Pei, Dongming Liu, Xin Jin, Borui Li, Wanyuan Jiang, Zihui Song, Xigao Jian, Fangyuan Hu
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Abstract

Sodium ion hybrid capacitors (SIHC) are emerging as promising next-generation energy storage devices with high energy/power density. Presodiation is an essential part of SIHC production due to the lack of sodium sources in the cathode and anode. However, in the current presodiation methods, electrochemical presodiation by galvanostatic current charging and discharging requires a temporary half-cell or a complex reassembling process, which severely hinders the commercialization of SIHC. Herein, in situ synthesized Na2S infiltrated in activated carbon was used as a sodium salt additive for supplying Na+ in SIHC. Due to a low ratio of Na2S additive attributed to high theoretical specific capacity, the fabricated Na2S/activated carbon composite//HC SIHC can show a higher energy density of 129.71 Wh kg−1 than previously reported SIHC on presodiation of cathode additives. Moreover, the designed SIHC shows an excellent cycling performance of 10,000 cycles, which is attributed to the Na2S additive with the advantages of low decomposition potential and no gas generation. This work provides a novel approach for the fabrication of highly efficient Na2S additive composite cathodes for SIHC.

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将 Na2S 原位渗入活性炭作为钠离子混合电容器的高效预odiation 添加剂
钠离子混合电容器(SIHC)正在成为具有高能量/功率密度的下一代储能设备。由于阴极和阳极中缺乏钠源,预odiation 是 SIHC 生产的重要组成部分。然而,在目前的预odiation 方法中,通过静电电流充放电进行电化学预odiation 需要临时半电池或复杂的重新组装过程,这严重阻碍了 SIHC 的商业化。在此,将原位合成的 Na2S 渗入活性炭作为钠盐添加剂,为 SIHC 提供 Na+。由于高理论比容量导致 Na2S 添加剂的比例较低,与之前报道的预odiation 阴极添加剂的 SIHC 相比,制备的 Na2S/活性炭复合材料//HC SIHC 的能量密度更高,达到 129.71 Wh kg-1。此外,所设计的 SIHC 还具有 10,000 次循环的优异循环性能,这归功于 Na2S 添加剂具有低分解电位和不产生气体的优点。这项工作为制造用于 SIHC 的高效 Na2S 添加剂复合阴极提供了一种新方法。
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Issue Information Front Cover: Carbon Neutralization, Volume 3, Issue 6, November 2024 Inside Back Cover Image: Carbon Neutralization, Volume 3, Issue 6, November 2024 Back Cover Image: Carbon Neutralization, Volume 3, Issue 6, November 2024 A chronicle of titanium niobium oxide materials for high-performance lithium-ion batteries: From laboratory to industry
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