A polyaluminum/borate solid electrolyte and a battery

A technology of solid electrolyte and borate, applied in solid electrolyte, non-aqueous electrolyte, secondary battery, etc., can solve the problems of low ion conductivity, insufficient delocalization of negative charge, etc., and achieve good application prospects

Active Publication Date: 2021-09-21
SHENZHEN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 relatively high. Even lithium borate tartrate with low dissociation energy has a dissociation energy as high as 146kcal / mol, and high dissociation energy means lower ionic conductivity. The ionic conductivity of current solid-state electrolytes needs to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The present embodiment provides a lithium polytetrahydroxybenzoquinone borate ( M is a boron atom), synthesized according to the following steps:

[0027] Add 17.20 g of tetrahydroxybenzoquinone to 200 g of water 6.183 g of boric acid and 4.196 g of lithium hydroxide monohydrate were stirred and reacted at room temperature for 6 hours to obtain a reddish-brown solution, which was evaporated by rotary evaporation to obtain lithium polytetrahydroxybenzoquinone borate, which was a reddish-brown powder.

[0028] Structure Characterization: 13 The C NMR spectrum showed resonance peaks at chemical shifts of 138.5 and 169.0 ppm, corresponding to the hydroxyl and carbonyl carbons, respectively. The analysis result of hydrocarbon and nitrogen elements is C: 38.43%, which is the same as the molecular formula of the polymer (C 6 O 6 The theoretical carbon content (38.71%) corresponding to BLi)n is close, so the structure of the obtained lithium polytetrahydroxybenzoquinone b...

Embodiment 2

[0031] This embodiment provides a kind of lithium polytetrahydroxybenzoquinone aluminate ( M is an aluminum atom), synthesized according to the following steps:

[0032]17.20 grams of tetrahydroxybenzoquinone, 7.800 grams of aluminum hydroxide and 4.196 grams of lithium hydroxide monohydrate were added to 200 grams of water, and the reaction was stirred at room temperature for 6 hours to obtain a reddish-brown solution, and rotary evaporation was performed to obtain polytetrahydroxybenzoquinone lithium aluminate .

[0033] Structure Characterization: 13 The C NMR spectrum showed resonance peaks at chemical shifts of 143.2 and 175.3 ppm, corresponding to the hydroxyl and carbonyl carbons, respectively. The analysis result of hydrocarbon and nitrogen elements is C: 35.18%, which is consistent with the molecular formula of the polymer (C 6 O 6 The theoretical carbon content (35.64%) corresponding to AlLi)n is close, so the structure of the obtained lithium polytetrahydroxybe...

Embodiment 3

[0036] This embodiment provides a lithium poly-4,6-dihydroxy-1,3-phthalate borate ( M is boron atom), synthesized according to the following steps:

[0037] Add 19.80 g of 4,6-dihydroxy-1,3-phthalic acid to 200 g of dimethyl sulfoxide 6.183 g of boric acid and 4.196 g of lithium hydroxide monohydrate were stirred and reacted at room temperature for 6 hours to obtain a pale yellow solution, which was evaporated by rotary evaporation to obtain poly-4,6-dihydroxy-1,3-phthalic acid lithium borate.

[0038] Structure Characterization: 13 The C nuclear magnetic resonance spectrum has resonance peaks at chemical shifts of 103.1, 105.1, 136.1, 155.1 and 159.6ppm. The analysis result of hydrocarbon and nitrogen elements is C: 45.15%, which is consistent with the molecular formula of the polymer (C 8 O 6 The theoretical carbon content (45.28%) corresponding to BLi)n is close, therefore, the structure of the obtained lithium poly-4,6-dihydroxy-1,3-phthalic acid borate is proved to b...

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Abstract

The invention discloses a polyaluminum / borate solid electrolyte and a battery. The polyaluminum / borate solid electrolyte is an alkali metal salt in which at least one ligand Ar and a coordination atom M form a coordination compound. The structural formula of the ligand Ar is that the structural formula of the polyaluminum / borate solid electrolyte is wherein 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 or and Y is selected from -OH, -COOH, -SO 3 At least 2 substitutions of substituents in H. The present invention uses a conjugated benzene ring monomer ligand with strong electron-absorbing ability to delocalize the negative charge of the anion to the entire main chain, which is conducive to the migration of lithium ions along the main chain, thereby reducing the dissociation energy of lithium ions and improving Lithium ion conductivity has a good application prospect in the field of batteries.

Description

technical field [0001] The present invention relates to a solid electrolyte, in particular to a 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 high energy density, long life and high voltage. With the thinning, multi-functional, and large-screen smartphones and notebook computers, as well as 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, traditional lithium-ion batteries based on liquid electrolytes and intercalation compounds have approached their energy density and have limited room for improvement. Moreover, traditional liquid electrolytes contain a large amount of flammable solvents, which may lead to serious safety problems such as deflagration or even explosion under abnormal conditions. [0003] I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 曾绍忠韩培刚朱海鸥
Owner SHENZHEN TECH UNIV
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