Creep-Enabled 3D Solid-State Lithium-Metal Battery
Creep-Enabled 3D Solid-State Lithium-Metal Battery
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DOI：
10.1016/j.chempr.2020.09.005
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发表时间：
2020-11-05
期刊：
影响因子：
23.5
通讯作者：
Li, Ju
中科院分区：
文献类型：
--
作者：
Wang, Ziqiang;Li, Xiaoyan;Li, Ju
现有的全固态锂金属电池受到化学腐蚀性和机械压力的锂金属的攻击。锂金属是一种软晶体，可能表现出位移或扩散变形。在这里，我们描述了一类全固态锂金属电池，由电化学稳定的混合锂离子和电子导体（MIEC）和电子和锂离子绝缘体（ELI）制成的3D多孔锂金属主体实现。在3D开放多孔MIEC/ELI结构中，锂金属作为“不可压缩工作流体”通过界面扩散蠕变进行进退，具有快速应力松弛和与固体电解质（SE）接触最小的特点，从而显着提高了电化学力学稳定性。原位透射电子显微镜与热力学分析相结合，提供了3D多孔MIEC/ELI结构的材料、尺寸和界面设计原则，适用于其他碱金属电池。蠕变电池发动机的成功制造，为高密度、电化学和机械性能稳定的全固态锂金属电池开辟了一条新途径。
Existing all-solid-state Li-metal batteries suffer attacks by the chemically aggressive and mechanically stressful Li metal. Li metal is a soft crystal and may exhibit either displacive or diffusive deformation, Here, we describe a class of all-solid-state Li-metal batteries enabled by 3D porous Li-metal hosts made of electrochemically stable mixed Li-ion and electronic conductor (MIEC) and electronic and Li-ion insulators (ELI). Within 3D open porous MIEC/ELI structure, Li metal advances and retracts via interfacial diffusional creep as an "incompressible working fluid" with fast stress relaxation and minimal contact with a solid electrolyte (SE), thereby significantly improving the electrochemomechanical stability. In situ transmission electron microscopy corroborated with thermodynamic analyses offers design principles in materials, sizes, and interfaces of the 3D porous MIEC/ELI structures, which are applicable to other alkali-metal batteries. The successful construction of a creep-enabled battery engine opens a new avenue toward high-density, electrochemically and mechanically robust all-solid-state Li-metal batteries.