Shenzhen International Graduate School, Tsinghua University
Prof. Ziqiang Wang works on solid-state Li metal batteries and electron microscopy. Prof. Ziqiang Wang authored many high impact papers in leading journals, including Nature, Nat. Commun., Chem, etc as first (co)author or corresponding authors. Prof. Ziqiang Wang received his B.S. and M.S. from Tsinghua University, and obtained his Ph.D degree in Massachusetts Institute of Technology, and now is the assistant professor at Tsinghua University, Shenzhen International Graduate School.
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, that the Li metal host is made of low-dimensional materials, which could limit the Li metal size down to nanometer scale. Such spatial confinement by low-dimensional materials make Li metal advance and retract 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 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.
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