Intrinsically Microporous Polyaluminum/Borate Solid-State Electrolytes and Batteries

Abstract

The invention discloses an inherently microporous polyaluminum / borate solid electrolyte and a battery. The inherently microporous polyaluminum / borate solid electrolyte is an alkali metal salt in which at least one ligand Ar forms a coordination compound with a coordination atom M , the structural formula of the ligand Ar is that at least one ligand Ar is a non-centrosymmetric structure, and the structural formula of the polyaluminum / borate solid electrolyte is where N represents an alkali metal element, n represents the degree of polymerization, and X 1 、X 2 each independently selected from SO 2 , CO or absent, Y is selected from and Y is selected from -OH, -COOH, -SO 3 At least 2 substitutions of substituents in H. The present invention uses non-centrosymmetric ligands, and the structure of the polyaluminum / borate solid electrolyte formed by it is a highly distorted one-dimensional molecular chain, which cannot be tightly packed in three-dimensional space, thus forming inherent micropores, The introduction of intrinsic micropores can achieve various performance improvements, and has a good application prospect in the battery field.

Description

technical field [0001] The invention relates to a solid electrolyte, in particular to an intrinsic microporous polyaluminum / borate solid electrolyte and a battery. Background technique [0002] Lithium-ion batteries are widely used in smartphones, notebook computers and electric vehicles due to their excellent performance such as high energy density, long life and high voltage. With the thinner, lighter, multifunctional, larger screens of smartphones and notebook computers and the development of electric vehicles, the energy density and safety requirements of batteries are getting higher and higher. However, after nearly three decades of development, the energy density of traditional lithium-ion batteries based on liquid electrolytes and intercalation compounds has approached its limit, and the room for improvement is very limited. Moreover, traditional liquid electrolytes contain a large amount of flammable solvents, which may cause serious safety problems such as deflagra...

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Problems solved by technology

[0005] However, the reported four-coordinated boric acid / aluminate anion uses ligands with weak electron-absorbing ability such as pentaerythritol and tartaric acid, so the negative charge delocalization is not enough, and the corresponding lithium ion dissociation energy is high. Among them, even lithium borate tartrate with low dissociation energy has a dissociation energy as high as 146kcal / mol, and high dissociation energy means lower ion conductivity

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