Active Reconfigurable Tristable Square‐Twist Origami

Abstract

Origami structures offer valuable applications in many fields, ranging from metamaterials to robotics. The multistable characteristics of origami structures have been pursued for acquiring unique reconfigurable features. For achieving this goal, an unusual polymeric tristable origami structure is demonstrated using a classic square‐twist origami configuration. By manipulating both material properties and geometric parameters of the heteropolymer structures, a design principle for tailoring the multistable configuration in the square‐twist origami is established based on variation of the structural potential energy. Under thermal triggering, the stiffness of the deformable structure is dramatically reduced, which causes an increase in the structural degree of freedom, allowing for self‐deployment via release of the prestored energy in the elastic twisted hinges. Utilizing such unique features and design principles, a prototype of frequency reconfigurable origami antenna of five diverse operating modes and a programmable multiple‐input multiple‐output communication system is subsequently designed and assembled, aiming to substantially promote the channel capacity and communication reliability. The findings and results firmly provide a remarkable design principle and strategy for advancing active origami structures and devices in shape‐morphing systems.

Unraveling the Li Penetration Mechanism in Polycrystalline Solid Electrolytes

“…[ 22 ] Equations 2 and 3 are solved simultaneously with the mass transport (Equation S19, Supporting Information), charge equilibrium (Equation S20, Supporting Information), and the stress equilibrium equation. Stress evolution at the interface involves complicated contact mechanics, [ 26,32 ] creep or viscoplastic behavior of Li metal, [ 25,33 ] and the volumetric change of the electrode. To make the problem mathematically tractable, we assume that the inelastic strain due to the volume expansion of Li metal is the only source of the internal stress generation, and the contact mechanics is not considered.…”

Interface Issues and Challenges in All‐Solid‐State Batteries: Lithium, Sodium, and Beyond

“…The solid interfaces with favorable bifunctional conductivity for electron and ion are essential in principle, [ 7 ] but the complex interfaces involve in physics, chemistry, and mechanics, lying at the heart of the solid‐state battery concepts. [ 8 ] Therefore, deep understanding of the interface behavior and mechanism of the all‐solid‐state lithium batteries is a necessity. Interface issues in the solid‐state batteries can be understood from two aspects, interface physics and interface chemistry.…”

Modulating Nanoinhomogeneity at Electrode–Solid Electrolyte Interfaces for Dendrite‐Proof Solid‐State Batteries and Long‐Life Memristors

“…In fact, a number of studies have shown that electro‐chemo‐mechanical coupling strongly affects the interfacial stability of solid‐state batteries (SSBs). [ 35,36 ] One the one hand, local strain influences the interfacial contact and the electrochemical reaction rates. On the other hand, the electrochemical deposition of lithium can further cause mechanical deformation at the interfaces, forming a feedback loop.…”