The present work proposes a new approach to increasing the capacity of all-solid-state batteries, based on the in-situ formation of an electrolyte in a Mg(BH4)2 electrode. Charge/discharge assessments of the...

Lithium metal is the best candidate anode for high specific energy density batteries because of its high specific capacity and low negative potential. However, lithium dendrite formation and growth during the lithium plating and stripping cycles have hindered the use of lithium metal as the anode for practical batteries. Here, a mechanism for the suppression of lithium dendrite formation and growth in a composite separator of Kimwipe paper (KW) and porous polyethylene (PE) for various electrolytes was examined. The Li/KW/PE electrode in an electrolyte of 1 m Li(CFSO 3 ) 2 N (LiFSI) in 1,4, dioxane (DX)-1,2 dimethoylethane (DME) (1 : 2 v/v) with a wide electrochemical window was successfully cycled without lithium dendrite shortcircuiting at 5 mA cm À 2 and 25 °C for 10 h over 25 cycles. Lithium was deposited into the cellulose fiber network during the lithium plating process, which resulted in the formation of a three-dimensional (3D) lithium electrode. Whereas, the composite separator of KW and PE was not effective to suppress the lithium dendrite formation and growth with the conventional carbonate based electrolyte of 1 m LiPF 6 in ethylene carbonatedimethyl carbonate.

Aqueous lithium-air batteries are one of the most promising batteries for electric vehicles because of its high energy and power density. The battery system consists of a lithium anode and an aqueous solution catholyte, which are separated by a water-stable lithiumion-conducting solid electrolyte, and an air electrode. The theoretical energy density of this system is 1,910 W h kg −1 , which is around five times higher than that of conventional lithium-ion batteries. A key component of this system is the water-stable lithium-ion-conducting solid electrolyte. In this work, we have developed a water-stable and water-impermeable solid electrolyte with a high lithium-ion conductivity of around 10 −3 S cm −1 at room temperature by the addition of epoxy resin and LiCl into a tapecast NASICON-type Li 1. 4 Al 0. 4 Ge 0. 2 Ti 1. 4 (PO 4) 3 film. The aqueous lithium-air battery with the solid electrolyte separator was successfully cycled at 0.5 mA cm −2 and 25 • C in an air atmosphere.

NASICON-type Li 1.4 Al 0.4 Ge 0.2 Ti 1.4 (PO 4 ) 3 solid electrolyte (AG-SE) was synthesized using a rheological phase method precursor. The AG-SE powders prepared by this method had a low crystalline temperature of 595.5°C and much fewer impurity phases than that prepared by the conventional solid-state method. An AG-SE pellet sintered at 900°C for 14 h had a high relative density of 95.3%, with total and grain boundary room temperature conductivities of 1.21 and 4.35 mS cm −1 individually. The total activation energy for the AG-SE was as low as 0.29 eV. The 3-point bending strength was determined to be 102 N/mm 2 , which was higher than that of AG-SE prepared by solid-state and liquid-phase method precursors.