| At present,flexible electronics and related industries have become an important scientific frontier in the international academic community,which has great application prospect in display,energy storage,field effect transistor,electronic skin and other fields.As an important branch of flexible electronics,the research of stretchable electronics is dedicated to coordinated control of the mechanical properties and optoelectronic properties of materials,which helps to improve the stability of devices,prolong service life,and improve industrial efficiency.With the rapid development of stretchable electronics,people’s demand for stretchable energy storage devices is growing stronger.One of the keys lies in the preparation of electrolyte materials with both high ionic conductivity and mechanical properties.So far,lots of stretchable electrolytes with various structures have been reported,such as solid polymer electrolytes and gel electrolytes.However,solid polymer electrolytes usually show low ionic conductivity and poor stretchability,gel electrolytes with high ionic conductivity usually sacrifice tensile strength and stretchability.The ionogel electrolyte becomes an ideal electrolyte for safe and flexible lithium-ion batteries which combines the advantages of gel electrolyte and ionic liquid,such as high ionic conductivity,low interface resistance,high thermal stability,low flammability,and wide electrochemical window.However,people still need to improve the mechanical and electrochemical properties of the ionogel electrolytes,so that it can achieve efficient and stable ionic conductivity during large deformation.In response to the above problems,this thesis uses the organic-inorganic interpenetrating dualnetwork strategy to synthesis a series of ionogel electrolytes.In the process of stretching and resilience,the physical cross-linking points of the inorganic network are reversibly broken and generated to dissipates energy.The stretchable organic network is responsible for maintaining the shape of the material.A large number of ionic liquids in the dual-network provide ionic conductivity,and finally realize the coordinated regulation of mechanical properties and conductivity.The main research results are as follows:(1)In this thesis,the TiO2 inorganic network and polybutyl acrylate(PBA)organic network are introduced into the organic-inorganic dual-network structure.The TiO2-PB A organic-inorganic dualnetwork ionogel electrolyte(OIIGE)was successfully synthesized with the characteristics of high stretch,high resilience and high conductivity.The optimized electrolyte can be stretched by 870%,and the ion conductivity is as high as 1.34 mS/cm at 30℃,which has broad application prospects in stretchable lithium-ion batteries,supercapacitors and other stretchable energy storage devices.(2)OIIGE is applied to lithium-ion batteries and shows high device performance.In addition,a stretchable lithium metal battery was successfully prepared through a simple process,in which VHB pressure-sensitive adhesive was selected as a stretchable packaging material.The battery can steadily illuminate the small LED bulb under 50%deformation.The preparation method of the stretchable battery based on VHB packaging expected to be applied to the large-scale preparation of stretchable energy storage devices has the advantages of simplicity,feasibility and low cost.(3)This thesis further constructs an organic-inorganic dual-network polyzwitterionic ionic gel(DPZIGE)based on SiO2 and poly(2-methacryloyloxyethyl phosphorylcholine/3-dimethyl ammonium propane sulfonate).The DPZIGE has the characteristics of high tensile,high strength and highly conductive.The optimized electrolyte can be stretched by 570%,the tensile strength is as high as 0.74 MPa,and the ion conductivity is 0.29 mS/cm at 30℃,which has great application potential in the field of stretchable energy storage devices. |
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