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Photo-assisted lithium–oxygen (Li–O2) batteries have been developed as a new system to reduce a large overpotential in the Li–O2 batteries. However, constructing an optimized photocatalyst is still a challenge to achieve broad light absorption and a low recombined rate of photoexcited electrons and holes. Herein, oxygen vacancy-rich molybdenum trio...
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... are Li2O2 [49]. After recharge, the Li2O2 peak disappears, suggesting the complete 322 decomposition of formed Li2O2, which is consistent with the in-situ XRD results. The morphology changes of Li2O2 are studied by using SEM to characterize the cathode at 100 mA 330 g −1 in different electrochemical states. Compared with the pristine cathode ( Fig. S2A in ESM), the 331 SEM image of the discharged cathode shows that the Li2O2 is film-like (Fig. 9A). As seen in Fig. 9B, 332 the film-like Li2O2 completely removed after recharge. The film-like Li2O2 accumulates continuously 333 after deep discharge and their morphology remained unchanged (Fig. S2B in ESM). Note that the 334 reversible formation ...
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... states. Compared with the pristine cathode ( Fig. S2A in ESM), the 331 SEM image of the discharged cathode shows that the Li2O2 is film-like (Fig. 9A). As seen in Fig. 9B, 332 the film-like Li2O2 completely removed after recharge. The film-like Li2O2 accumulates continuously 333 after deep discharge and their morphology remained unchanged (Fig. S2B in ESM). Note that the 334 reversible formation and decomposition of Li2O2 could be maintained up to 50 cycles, as shown in 335 ...
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... TEM images (Figure 3e,f) confirmed the three-dimensional porous structure of the SrV 4 O 9 @rGO composite. The porous nanostructure increases the contact area between the active material and the electrolyte and effectively reduces the ion diffusion distance, thus improving ion transport efficiency [28][29][30][31][32]. In addition, the porous nanostructure provides sufficient buffering space for Molecules 2024, 29, 2704 4 of 10 volume expansion during cycling processes, effectively enhancing cycling stability [33][34][35][36][37][38]. ...
... Molecules 2024, 29, x FOR PEER REVIEW 4 of 10 dimensional porous structure of the SrV4O9@rGO composite. The porous nanostructure increases the contact area between the active material and the electrolyte and effectively reduces the ion diffusion distance, thus improving ion transport efficiency [28][29][30][31][32]. In addition, the porous nanostructure provides sufficient buffering space for volume expansion during cycling processes, effectively enhancing cycling stability [33][34][35][36][37][38]. ...
Sodium-ion batteries (SIBs) have received considerable attention in recent years. Anode material is one of the key factors that determine SIBs’ electrochemical performance. Current commercial hard carbon anode shows poor rate performance, which greatly limits applications of SIBs. In this study, a novel vanadium-based material, SrV4O9, was proposed as an anode for SIBs, and its Na+ storage properties were studied for the first time. To enhance the electrical conductivity of SrV4O9 material, a microflower structure was designed and reduced graphene oxide (rGO) was introduced as a host to support SrV4O9 microflowers. The microflower structure effectively reduced electron diffusion distance, thus enhancing the electrical conductivity of the SrV4O9 material. The rGO showed excellent flexibility and electrical conductivity, which effectively improved the cycling life and rate performance of the SrV4O9 composite material. As a result, the SrV4O9@rGO composite showed excellent electrochemical performance (a stable capacity of 273.4 mAh g−1 after 200 cycles at 0.2 A g−1 and a high capacity of 120.4 mAh g−1 at 10.0 A g−1), indicating that SrV4O9@rGO composite can be an ideal anode material for SIBs.
