3D Vertically Aligned Microchannel Three-Layer All Ceramic Lithium Ion Battery for High-Rate and Long-Cycle...

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 Li₄ Ti₅ O₁₂ ceramic as anode, LiCoO₂ as cathode, and Li_0.34 La_0.56 TiO₃ 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.