High‐capacity cathodes and anodes in energy storage area are required for delivering high energy density due to the ever‐increasing demands in the applications of electric vehicles and power grids, which suffer from significant safety concerns and poor cycling stability at the current stage. All‐solid‐state lithium batteries (ASSLBs) have been considered to be particularly promising within the new generation of energy storage, owing to the superiority of safety, wide potential window, and long cycling life. As the key component in ASSLBs, individual solid electrolytes that can meet practical application standards are very rare due to poor performance. To the present day, numerous research efforts have been expended to find applicable solid‐state electrolytes and tremendous progress has been achieved, especially for garnet‐type solid electrolytes. Nevertheless, the garnet‐type solid electrolyte is still facing some crucial dilemmas. Hence, the issues of garnet electrolytes' ionic conductivity, the interfaces between electrodes and garnet solid electrolytes, and application of theoretical calculation on garnet electrolytes are focuses in this review. Furthermore, prospective developments and alternative approaches to the issues are presented, with an aim to improve understanding of garnet electrolytes and promote their practical applications in solid‐state batteries.

Electrochemical exfoliation of graphene-like two-dimensional nanomaterials such as monoelemental Xenes, TMDs, MOFs, and MXene is introduced in detail.

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redox pair of Fe 2+ /Fe 3+ . In order to further improve the electrochemical capability of PB-type cathodes, the evolved manners, containing size-controlled, crystalline increased, and elements substituted, are usually employed. [5] Note that size reduction could broaden the energy distribution of surface and induce more ions adsorbing that brought them more to participate in the redox reaction. [6] As shown by previous reports, [7] high crystallinity always indicated that less coordinated water would occupy the [Fe(CN) 6 ] vacancies, giving rise to the stability of FeCNFe bridge, followed by the considerable capacity at large current density. Importantly, through the replacement of Fe atoms by metal ions (Ni, Co, and Mn), the evolution of physical-chemical features could be effectively tuned, like the morphology, crystalline, and internal pore structure, etc. [5b] For example, the Nidoped PB structure was investigated with the different contents of Ni-doped, and it is obvious that the optimized sample could deliver a capacity of ≈55 mAh g −1 . [5b] It should be noted that the substitutions of heteroatoms (Ni, Co, and Mn substituted Fe ions of PBs) have not been systemically investigated on the effect of the physicalchemical traits in details.Alternatively, restricted by weak Na-storage capacity of traditional anodes, the explorations of new materials with both satisfactory capacity and ultrafast rate ability are urgent. [8] Meanwhile, PBs as a controllable precursor have been utilized to provide great architecture with various element component such as hollow Fe 2 O 3 microboxes and NiS nanoframes, etc. [2b] Notably, compared to metal-oxide/sulfur, metal-selenides show lower energy consumption of conversion reaction, owing to its weak electronegativity (2.5) and high electronic kinetics (1 × 10 −5 S m −1 ). [9] However, their electrochemical properties are still limited by the similar issues of conversion-type materials, containing the volume swelling and the dissolution of polysulfide/polyselenide during cycling. [10] Fortunately, in the process of transformation from cathodes to anodes of PBs, the CN groups would be effectively turned into nitrogen-doped carbon, which boosts the alleviation of volume change and the stabilization of by-products. Moreover, it is found that foreign cations assisted metal-selenide would bring about more active defects and exposed edge sites. [11] Bestowed by the experiences Exploring high-rate electrode materials with excellent kinetic properties is imperative for advanced sodium-storage systems. Herein, novel cubic-like XFe (X = Co, Ni, Mn) Prussian blue analogs (PBAs), as cathodes materials, are obtained through as-tuned ionic bonding, delivering improved crystallinity and homogeneous particles size. As expected, Ni-Fe PBAs show a capacity of 81 mAh g −1 at 1.0 A g −1 , mainly resulting from their physical-chemical stability, fast kinetics, and "zero-strain" insertion characteristics. Considering that the combination of elements incorporated with carbon may increase ...

Black phosphorus, an attractive anode material for sodium‐ion batteries (SIBs), has aroused grand attention because of its high theoretical capacity. Nevertheless, its practical exploration is limited by large volume swelling, followed by rapid capacity decaying. Herein, both large‐area few‐layer phosphorene and low‐defect graphene are obtained by electrochemical exfoliation. The sandwich‐structured phosphorene–graphene hybrid with the simultaneous introduction of PC and POC bonds through chemical activation is employed to heighten the performance of SIBs, leading to a high specific capacity of 2311 mA h g−1 (based on the mass of phosphorene) at 0.1 A g−1 with a capacity retention of 83.9% after 100 loops, which can be ascribed to the flexible space of graphene layers that alleviates the volumetric expansion of phosphorene. Moreover, the stable chemical bonds as the bridge for electrons transferring can immobilize phosphorene and protect phosphorene from cracking during the sodiation/desodiation process. Expectedly, the anode exhibits excellent cycle performance of 200 loops with retained capacities of 1582.6 and 1120.6 mA h g−1 at 1 and 5 A g−1, respectively. Therefore, this electrochemical approach provides a guide for the preparation of other sandwiched 2D materials, which can be applied in high‐performance energy‐storage devices.

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N-rich carbon-coated Co3S4 ultrafine nanocrystals derived from ZIF-67 were employed as anodes of sodium-ion batteries with enhanced sodium storage performance.

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