Sodium‐ion capacitors (SICs) have triggered considerable attention due to potential high energy densities under high power densities. The presodiation process of anodes is very important for the construction of high‐performance SICs; however, in the current presodiation method, metallic sodium is utilized as the presodiation agent through the assembling/disassembling of half‐cells, which is very complicated and dangerous, greatly hindering the development of SICs. Herein, a novel voltage‐induced high‐efficient in situ presodiation approach is successfully realized by introducing organic sodium salts as the sodium sources into the cathode. Moreover, the irreversible electrochemical characteristic of organic sodium salts triggered by high voltage could provide sufficient sodium sources for presodiation without any negative effects for further operation of SICs. Significantly, the diversified anodes like carbon and TiO₂ are successfully presodiated and the corresponding SICs manifest excellent electrochemical performances. This rational strategy is anticipated to shed light on a potential avenue for greatly simplifying the assembly process of the SICs, which may largely accelerate the commercialization process of SICs.

中文翻译：

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钠离子电容器的电压诱导高效原位沉淀策略

由于在高功率密度下潜在的高能量密度，钠离子电容器（SIC）引起了极大的关注。阳极的预沉淀过程对于高性能SIC的构建非常重要。然而，在目前的预沉淀方法中，金属钠通过半电池的组装/拆卸被用作预沉淀剂，这非常复杂且危险，极大地阻碍了SIC的发展。在此，通过将有机钠盐作为钠源引入阴极，成功实现了一种新型的电压感应高效原位预沉积方法。此外，高压触发的有机钠盐不可逆的电化学特性可以为钠盐的沉淀提供足够的钠源，而不会对SIC的进一步运行产生任何负面影响。值得注意的是，多样化的阳极，例如碳和TiO₂已成功推定，相应的SIC表现出出色的电化学性能。预期这种合理的策略将为大大简化SIC的组装过程提供潜在的途径，这可能会大大加快SIC的商业化进程。