3D Vertically Aligned Microchannel Three‐Layer All Ceramic Lithium Ion Battery for High‐Rate and Long‐Cycle Electrochemical Energy Storage

Due to the growing energy and safety demands, rechargeable all‐solid‐state Li+ batteries using metallic Li anode and ceramic‐based electrolytes have attracted extensive attentions. However, the inherent safety problem of Li metal anode, the ceramic‐electrode low Li+ conductivity, and the high electrolyte/electrode solid–solid interfacial impedance slow the development of high‐performance all‐solid‐state batteries. In this work, a three‐layer all ceramic battery with Li4Ti5O12 ceramic as anode, LiCoO2 as cathode, and Li0.34La0.56TiO3 as electrolyte to solve the safety problem is proposed. The low Li+ conductivity of electrodes are effectively addressed by fabricating the electrode/electrolyte composite electrodes in 3D vertically aligned microchannel structures. The large interfacial impedance is greatly reduced by co‐constructing the microchannel‐dense‐microchannel structure with high Li+ conducting electrolytes. Experimental results reveal that a working cell by applying the 3D vertically aligned microchannel three‐layer all ceramic structure enables high energy storage at 2 C rate and long cycling stability for more than 500 times.