Inorganic/organic nano composite solid electrolyte and method of preparing the same

Abstract

The invention discloses an inorganic / organic nanometer composite solid electrolyte and a preparation method thereof, belonging to the inorganic / organic nanometer composite material and the preparation process field. The solid electrolyte is composed by polyethylene oxides PEO, lithium perchlorates LiClO4 and hydrotalcite nanometer sheets LDHNS, has a chemical formula of PEO / LiClO4 / LDHNS, the massparts of each component are 54-91%, 8-16% and 1-30% respectively. The preparation method of the composite solid electrolyte comprises: mixing PEO, LiClO4 and LDHNS in water equably and sufficiently, and then vaporizing the solvent to obtain the composite solid electrolyte of the invention. The inorganic / organic nanometer composite solid electrolyte according to the invention has high conductivity, high lithium ion transference number and heat stability, the electrolyte can be used as the electrolyte of a solid lithium ion battery.

Description

A kind of inorganic / organic nanocomposite solid electrolyte and preparation method thereof technical field The invention relates to an inorganic / organic nanocomposite solid electrolyte and a preparation method thereof, and belongs to the technical field of inorganic / organic nanocomposite materials and their preparation. Background technique In lithium-ion batteries, the use of solid electrolytes has the advantages of less leakage, safety, and easy installation compared to liquid electrolytes, but the low ion mobility and poor thermal stability of solid electrolytes limit their use in actual production. application. Among many conductive polymer matrices, polyethylene oxide (PEO) is a fast ion conductor and a good solvent for lithium salts. It has the advantages of good chemical stability, easy availability of raw materials, and simple synthesis methods. However, unmodified pure PEO has the following disadvantages as a solid electrolyte: firstly, because it is a macromolec...

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Problems solved by technology

However, unmodified pure PEO has the following disadvantages as a solid electrolyte: firstly, because it is a macromolecular polymer, the ion conductivity is low due to its high crystallinity, which cannot meet the needs of lithium ion transmission; secondly, as a pure organic matter, the material The thermal stability and mechanical properties need to be further improved

However, combining hydrotalcite nanosheets LDHNS with conductive polymer PEO destroys the orderly arrangement of PEO crystals, reduces its crystallinity, and improves the thermal stability of PEO while increasing its ionic conductivity and lithium ion migration number. no relevant reports

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