Superior Charge-discharge Behaviors of Pillared Carbon Thin-films as the Anode of All-solid-state Lithium-ion Battery

The charge-discharge behaviors of pillared carbon thin-films as an anode of all-solid-state lithium-ion batteries were investigated, using LiBH4 as the solid electrolyte.The reduced contact area between the pillared carbon thin films and the solid electrolyte resulted in the suppression of side reactions originating from the solid electrolyte.The capacity of the pillared carbon thin-film electrodes increased with the increase in the Si content and reached a very high value of 1278 mAh g -1 .Lithium ions were intercalated into the interlayer space of the pillared carbon and the interlayer distance increased from 1.33 to 1.42 nm upon lithium storage.A slight change in the XANES spectrum of the pillared carbon in the Si K-edge region after the introduction of lithium ion indicated that lithium ions were introduced in the vicinity of silicon atom surrounded by 3 oxygen atoms and one methyl group.The present results indicate that pillared carbon is a promising anode material for all-solid-state lithium-ion batteries.