Quasi-solid state electrolyte for sodium ion battery based on hydrated glass and preparation method and application thereof

Abstract

The invention discloses a quasi-solid state electrolyte of a sodium ion battery based on hydrated glass and a preparation method and application thereof. A quasi-solid state electrolyte for sodium ionbatteries based on hydrated glass is prepared by using Na2O-B2O3-SiO2-The hydrated glass of H2O system is used as matrix, sodium salt as admixture, Na2O: B2O3: SiO2: H2O=8-30: 0.5-3:20-70: 2-60, andthat admixture is 0. 5% by weight of the total mass of the admixture 0-10 wt%. 4qqq1) weighing that required matrix raw material, mixing with sodium salt admixture, uniformly stirring, standing, clarify and aging to form a colorless transparent liquid; 2) after 20-350 DEG C, 12-48 h heat treatment, the water content is adjusted and the elastic solid electrolyte is obtained. 3) Performing perfusion-heat seal of viscous liquid electrolyte and the elastic solid electrolyte is assembled by heat-sealing method, and the elastic solid electrolyte is assembled by solidification and hot-pressing method. The central working region with lower Tg and the edge region with higher Tg are formed by secondary heating. The invention has the advantages of good adaptability and stability, low cost, simple operation, easy control and realization of the process, and environment friendliness.

Description

technical field [0001] The invention relates to a quasi-solid-state electrolyte material for a sodium ion battery and a preparation method thereof, in particular to a sodium ion battery 2 O-B 2 o 3 -SiO 2 -H 2 The invention relates to a sodium ion battery electrolyte material with O system hydrated glass as a matrix and sodium salt as an external dopant, belonging to the technical field of preparation of inorganic non-metallic materials and the field of sodium ion batteries. Background technique [0002] With the rapid development of the current new energy industry, people's demand for energy conversion and storage is expanding rapidly. The development of traditional lithium-ion batteries is greatly restricted due to insufficient lithium reserves, about 70% of which are distributed in South America. Looking for a substitute for lithium metal elements are necessary. As a result, sodium-ion batteries have received widespread attention again. In sodium-ion batteries, elec...

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Problems solved by technology

[0005] In CN 106663550 A, a pure glass-type sodium-ion battery electrolyte is formed, and the rapid migration of ions is realized by using the gap of the network structure. Relatively high and easy to cause environmental pollution; CN 106832135 A discloses a modified polyvinyl alcohol copolymer and its preparation method. The network structure formed by the polymer provides a carrier for the liquid electrolyte, but its cycle performance is not good

CN102394319 A discloses a method of modification based on the formulation of existing commercial nano-gas phase silica colloidal electrolyte or silica sol colloidal electrolyte. This electrolyte utilizes nano-scale gas phase silica to disperse in sulfuric acid to form a gel system thereby Improves the stability and safety of the lead-acid battery electrolyte, but this gel system forms an overly stable and narrow network structure that is not conducive to ion migration, and its cycle performance as a gel is also poor

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