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All‐solid‐state batteries (ASSBs) are expected to be next‐generation energy storage systems due to their high energy density and safety. However, their practical use has been limited by a poor rate capability caused by the Li dendrite growth. Under the operation with high current density, the Li migration rate at the interface between anode and solid electrolyte (SE) is faster than the Li replenishing rate by atom diffusion inside of Li, resulting in void formation at the interface between the anode and SE. These voids induce the increase in the localized current density, leading to the growth of Li dendrites. In this study, an ASSBs system is demonstrated with high rate capability by employing lithiated ZnO nanorods into Li. Lithiated ZnO nanorods, which are capable of Li‐ion conduction, providing the passage for Li transportation from the Li bulk to the interface between the Li and SE, resulting in an improvement in the replenishing rate. The lithiated ZnO nanorods in Li enable interfacial integrity by suppressing the void formation at the Li/SE interface even under the high current density. ASSBs employing Li with lithiated ZnO nanorods exhibit stable cyclability without short circuit at 0.3 C during 300 cycles and excellent rate capability. [ABSTRACT FROM AUTHOR]

• Kneading process increases adsorption amounts of Na-CMC on graphite surface. • High adsorption amounts of Na-CMC improve dispersibility of the slurry. • Enhanced dispersibility improves Li-ion kinetics with uniform pore distribution. • Li-CMC kneading process enhances Li-ion kinetics with superior SEI layer. • Li-CMC kneading process presents outstanding electrochemical performances. The low Li-ion kinetics caused by the high ionic and charge transfer resistance in the dense and thick electrode deteriorates electrochemical properties in lithium-ion batteries (LIBs) with high energy density. Here, we report a kneading process of the carboxymethyl cellulose (CMC) binder to improve Li-ion kinetics in the anode. The kneading process of Na-CMC increases the adsorption amount of Na-CMC on the graphite surface, which improves the dispersibility of the anode slurry. Enhanced dispersibility enables uniform pore distribution in the anode, which improves Li-ion kinetics. Moreover, replacing the Na-CMC with Li-CMC in the kneading process further improves Li-ion kinetics in the anode by reducing the charge transfer activation energy due to the formation of high Li-ion conducting LiF-rich solid-electrolyte interphase layer. The anode employing Li-CMC kneading process exhibits enhanced constant current charging capacity retention and cycling stability compared to those of the pristine anode. [ABSTRACT FROM AUTHOR]

Silicon is an attractive anode material for all-solid-state batteries due to its high theoretical capacity and low working potential. However, the poor cycle stability caused by electrical and ionic contact loss resulting from the severe volume change of the Si associated with Li should be addressed. Here, we report Si nanoparticles embedded in carbon nanofiber (CNF) sheathed with Li 6 PS 5 Cl (LPSCl) (Si/CNF@LPSCl) as anode material to achieve high energy density and stable cyclability for all-solid-state batteries. By embedding Si in the CNF, more favorable strain release and robust electronic pathways are available. The conformal coating of solid electrolyte on the surface of Si/CNF composite enhances the interfacial stability between the active material and the solid electrolyte, which leads to the improvement in electrochemical properties by suppressing the contact loss. The Si/CNF@LPSCl composite electrode exhibits a reversible capacity of 1172 mAh g−1 at 0.1C and stable cyclability of 84.3% at 0.5C after 50 cycles. Especially, the concentration of active material (Si/CNF@LPSCl) in the electrode is significantly increased without noticeable performance degradation due to the improved interfacial stability, which enables the increase of the energy density and reduction of the fabrication cost. • The Si/carbon nanofiber composite was prepared by an electro-spinning method. • By embedding the Si in the carbon nanofiber, strain release is available. • The solid electrolyte coating could preserve the charge conducting path. • The ratio of active material in the electrode could be significantly increased. [ABSTRACT FROM AUTHOR]