New enhancement mechanism of an ether-based electrolyte in cobalt sulfide-containing potassium-ion batteries

Abstract

The performance of potassium (K)-ion batteries (KIBs) is not only dependent on the electrode materials but also highly related to the electrolyte. In this work, we obtained cobalt sulfide (CS)-containing...

Modified reaction kinetics in ester-based electrolyte to boost sodium storage performance: a case study of MoS2/Ti3C2Tx hybrid

“…3a and b) demonstrate the excellent ionic kinetics and slight voltage polarization, facilitating the rapid and stable electrochemical redox. 36–38…”

“…3a and b) demonstrate the excellent ionic kinetics and slight voltage polarization, facilitating the rapid and stable electrochemical redox. [36][37][38] In principle, the difference in the charge storage kinetics can be estimated through the variation of the response current with scan rate, and the relationship between them follows a power-law equation:…”

“…4c), the peak intensity of NaF (683.5 eV) increases with increasing the Ar-ion sputtering time to 60 and 300 s, which indicates that the inorganic species were mainly distributed in the interior of the SEI layer. 38 With regard to the SEI generated in EC/DEC (Fig. S17, ESI †), organic components such as C-O/CvO and polyester and inorganic components such as sodium alkyl carbonate (NaCO 3 R), Na 2 CO 3 , NaF, and Na 2 O can be observed from the C 1s, O 1s, and F 1s spectra, respectively.…”

“…27 Generally, the distribution of organic components outside can improve the interaction between the electrolyte and electrode, thus providing a robust interface and rapid charge transportation. 38,63 For the inorganic components inside, the ionic diffusion in SEI can be modified, which is beneficial for decreasing the interfacial polarization. 23 The different electrochemical performance in the two electrolytes is also attributed to this discrepancy in the chemical components of the SEI.…”

Filling Selenium into Sulfur Vacancies in Ultrathin Tungsten Sulfide Nanosheets for Superior Potassium Storage

“…In comparison with Li resources, the greater abundance and accessibility of the Na and K resources have encouraged researchers to study the feasibility of sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs). In view of the fact that the K/K + has the lower standard reduction potential (−2.93 V vs SHE) compared to that of Na/Na + (−2.71 V vs SHE), which makes PIBs be preferred alternative to LIBs for practical applications. − However, the large size of K ions (1.38 Å) makes it difficult to achieve the high ion diffusivity in the electrode materials, which can lead to inferior storage performance and rate property. − Moreover, severe volume changes originating from the insertion/extraction of K + also will cause the rapid capacity decay during cycling . Therefore, designing anode materials with robust structure to facilitate K-ion diffusion/reaction is vitally important for achieving high-performance PIBs.…”