Title: 12 µm-Thick Sintered Garnet Ceramic Skeleton Enabling High-Energy-Density Solid-State Lithium Metal Batteries
First Author: Chengshuai Bao (Shanghai Institute of Ceramics, Chinese Academy of Sciences)
Corresponding Author: Zhaoyin Wen (Shanghai Institute of Ceramics, Chinese Academy of Sciences)
Due to the potential to address safety concerns and significantly improve energy density compared to liquid-state batteries, solid-state batteries are regarded as the next disruptive battery technology. Among them, ultrathin composite solid-state electrolytes show great promise in high-energy-density solid-state lithium metal batteries due to their lightweight and good compatibility with electrode interfaces. However, the uncontrolled dendrite growth and performance degradation caused by inorganic powder agglomeration have hindered the practical application of ultrathin composite solid-state electrolytes. Therefore, the development of new types of ultrathin composite solid-state electrolytes has become a current research focus.
Based on this, Zhaoyin Wen's team from the Shanghai Institute of Ceramics, Chinese Academy of Sciences, has successfully developed a flexible, self-supporting Li_(6.5)La₃Zr_(1.5)Ta_(0.5)O₁₂ (LLZO) ceramic skeleton. Subsequently, through in-situ ultraviolet curing technology, they obtained a three-dimensional interconnected structure composite membrane solid-state electrolyte with a thickness of only 12 µm by combining it with a polymer. The development of this composite electrolyte not only effectively avoids the agglomeration of ceramic powder phases in the composite electrolyte but also enables efficient regulation of ion transport through the continuous two-phase interface. The cross-linked polymer phase maintains the integrity of the composite electrolyte structure. Testing results show that the composite electrolyte exhibits a high lithium ion migration number of 0.83 and a high lithium ion conductivity of 1.19×10⁻³ S/cm at room temperature. A high-nickel ternary positive electrode full cell assembled with this electrolyte achieves a specific capacity of 185.4 mAh g⁻¹ at 0.1C, with an average coulombic efficiency exceeding 99%. This work was published in the top international journal Advanced Energy Materials, with Chengshuai Bao as the first author of the paper.
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