h i g h l i g h t sLi 6 PS 5 Cl solid electrolyte was prepared from ethanol solution. LiCoO 2 was coated with Li 6 PS 5 Cl solid electrolyte by using the solution. All-solid-state batteries using the electrolyte-coated LiCoO 2 operated reversibly. battery Lithium secondary battery Sulfide solid electrolyte Liquid phase method a b s t r a c t A Li 6 PS 5 Cl solid electrolyte was successfully prepared by dissolution-reprecipitation process via ethanol solution. An ionic conductivity of the Li 6 PS 5 Cl solid electrolyte from the homogeneous ethanol solution was 1.4 Â 10 À5 S cm À1 at room temperature. LiCoO 2 particles were coated with the Li 6 PS 5 Cl electrolyte via ethanol solution to form favorable electrode-electrolyte interface with a large contact areas. An allsolid-state cell using the electrolyte-coated LiCoO 2 operated as a rechargeable battery and showed the initial discharge capacity of 45 mAh g À1 at 25 C.

A Li 3 PS 4 solid electrolyte was directly synthesized from Li 2 S and P 2 S 5 by a liquid-phase reaction using N-methylformamide (NMF) and n-hexane as reaction media. After the reaction of Li 2 S and P 2 S 5 , a yellow NMF solution was obtained. The NMF solution was dried at 180 C for 3 hours under vacuum to remove NMF and to obtain a powder. A crystalline phase of the obtained powder from the NMF solution was attributed to Li 3 PS 4 crystals, and the ionic conductivity of the obtained powder was 2.3 Â 10 À6 S cm À1 at 25 C. Electrode-electrolyte composite materials for all-solid-state lithium batteries were prepared by coating the Li 3 PS 4 solid electrolyte onto LiCoO 2 particles using the NMF solution. SEM and EDX analysis showed that LiCoO 2 particles were uniformly coated with the Li 3 PS 4 solid electrolyte. An all-solid-state cell using the LiCoO 2 particles coated with the Li 3 PS 4 solid electrolyte as a positive electrode operated as a secondary battery.

Electrode-solid electrolyte composite materials for all-solid-state lithium batteries were prepared by coating of the Li2S-P2S5 solid electrolyte onto LiCoO2 particles using a N-methylformamide (NMF) solution of 80Li2S•20P2S5 (mol %) solid electrolyte. SEM and EDX analysis showed that the Li2S-P2S5 solid electrolyte was uniformly coated on LiCoO2 particles. The all-solid-state cell using the LiCoO2 particles coated with the solid electrolyte showed higher charge-discharge capacity than the cells using uncoated LiCoO2 particles.

The title solid electrolyte is prepared by drying N‐methylformamide solutions of 80Li2S·20P2S5 powders (obtained by mechanical milling) at 150 °C for 3 h under vacuum.

Surface modification of inorganic objects with metal-organic frameworks (MOFs) - organic-inorganic hybrid framework materials with infinite networks - opens wide windows for potential applications. In order to derive a target property, the key is the ability to fine tune the degree of modification. Solution-based step-by-step growth techniques provide excellent control of layer thickness which can be varied with the number of deposition cycles. Such techniques with MOFs have been mainly applied to flat substrates, but not to particle surfaces before. Here, we present the facile surface modification of inorganic particles with a framework compound under operationally simple ambient conditions. A solution-based sequential technique involving the alternate immersion of LiCoO2 (LCO) - a positive electrode material for a lithium ion battery - into FeCl2·4H2O and K3[Fe(CN)6] solutions results in the formation of Prussian blue (PB) nanolayers on the surface of the LCO particles (PBNL@LCO). The PB growth is finely controlled by the number of immersion cycles. An electrochemical cell with PBNL@LCO as a positive electrode material exhibits a discharge capacity close to the specific capacity of LCO. The results open a new direction for creating suitable interfacial conditions between electrode materials and electrolytes in secondary battery materials.

The title solid electrolyte is prepared by drying N-methylformamide solutions of 80Li 2S·20P2S5 powders (obtained by mechanical milling) at 150 C for 3 h under vacuum. The crystalline phase in the obtained material is Li3PS4 and Li2S and its lithium ion conductivity is 2.6 x 10 -6 S/cm. The solid electrolyte will be applicable for the formation of intimate electrode-solid electrolyte interfaces in all-solid-state battery systems to improve their performance. -(TERAGAWA, S.; ASO, K.; TADANAGA, K.; HAYASHI, A.; TATSUMISAGO*, M.; Chem. Lett. 42 (2013) 11, 1435-1437, http://dx.