Voltage‐Induced High‐Efficient In Situ Presodiation Strategy for Sodium Ion Capacitors

Abstract

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.

MOF-Derived CoSe2@N-Doped Carbon Matrix Confined in Hollow Mesoporous Carbon Nanospheres as High-Performance Anodes for Potassium-Ion Batteries

“…4e, f, respectively); these results indicate that the metallic Co nanoparticles revert back to CoSe 2 after the charging process. The ex situ XPS results also support the hypothesized electrochemical storage mechanism of the CoSe 2 @NC/ HMCS electrode [38]. In high-resolution K 2p spectrum, the K 2 CO 3 peak intensity in the fully discharged electrode is higher than that in the fully charged electrode (Fig.…”

Hard Carbon Nanosheets with Uniform Ultramicropores and Accessible Functional Groups Showing High Realistic Capacity and Superior Rate Performance for Sodium‐Ion Storage

“…The loss of ICE can be compensated by the available presodiation technology. [ 40,41 ] After charging and discharging at 5.00 A g −1 , the charging capacity of MPC‐1000 can be restored to 322 mA h g −1 at 0.02 A g −1 . These results indicate that MPC‐1000 exhibits superior structural stability, as can be further proved by the results of the cyclic performance tests (Figure 2c,d).…”

Prelithiation/Presodiation Techniques for Advanced Electrochemical Energy Storage Systems: Concepts, Applications, and Perspectives

“…Similarly, a novel voltage‐induced high‐efficient in situ presodiation method was reported by our group (Figure 12c). [ 147 ] An organic sodium salt named disodium rhodizonate (Na 2 C 6 O 6 ) as a sodium source was introduced into the AC cathode. Thanks to the irreversible electrochemical characteristic, the diversiform anodes including carbon and TiO 2 are successfully presodiated and the corresponding SICs deliver excellent electrochemical performances.…”