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A composite electrolyte for stabilizing lithium metal batteries

A technology of composite electrolyte and lithium metal battery, which is applied in the field of composite electrolyte and can solve the problems that the performance of lithium metal negative electrode needs to be improved.

Active Publication Date: 2022-07-05
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of the lithium metal negative electrode of this technical scheme still needs to be improved.

Method used

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  • A composite electrolyte for stabilizing lithium metal batteries
  • A composite electrolyte for stabilizing lithium metal batteries
  • A composite electrolyte for stabilizing lithium metal batteries

Examples

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Effect test

Embodiment 1

[0032] A composite electrolyte for stabilizing lithium metal batteries, comprising a lithium salt, an organic solvent and a composite additive, wherein the organic solvent comprises, 1,3-dioxolane accounts for 50% of the total volume of the organic solvent, ethylene dioxane Glycol dimethyl ether accounts for 50% of the total volume of the organic solvent, the selected anthrone violet 79 additive accounts for 1% of the total electrolyte mass, and the selected LiNO 3 The composite additive accounts for 1% of the total mass of the electrolyte, and the lithium salt is LiTFSI, and the lithium salt accounts for 18% of the total mass of the electrolyte.

[0033] The structure of SEI film can be divided into inorganic layer and organic layer. The inorganic layer is mainly composed of inorganic components, which have better and stable electrochemical performance and higher ionic conductivity; the organic layer is mainly composed of electrolyte decomposition and polymerization products. ...

Embodiment 2-7

[0037] Examples 2-7 The ratio of the lithium metal battery electrolyte is shown in Table 1. In these examples, the electrolyte is 1.0M lithium salt is dissolved in an organic solvent, and then inorganic additives and organic additives are added and stirred at 50 ° C for 24 hours to prepare Electrolyte, all reagents do not need further purification, all processes are prepared in a glove box (MbraunLabmaster glove box workstation), and the mass fraction of oxygen and water in the high-purity argon glove box are both lower than 0.1ppm. Six electrolytes were injected into the CR2032 coin-type lithium-ion battery, and their cycle performance data were tested at room temperature.

[0038] Table 1 List of data for Examples 2-7

[0039]

[0040] Examples 2-7 are lithium | lithium symmetric battery cycle data (current density 5mAh / cm 2 , capacity 1mAh / cm 2 ) like Figure 3-Figure 8 shown.

[0041] image 3 It is the cycle data of the lithium|lithium symmetric battery of Example 2...

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Abstract

The invention discloses a composite electrolyte for stabilizing lithium metal batteries, belonging to the field of lithium metal batteries. The composite electrolyte can not only be used as an adsorption site for inducing the formation of a dense SEI layer, but also can form a stable hybrid SEI film The conformal nano-barrier layer can inhibit the occurrence of side reactions at the electrode / electrolyte interface, improve the stability of the negative electrode material structure during the cycle, and effectively improve the cycle life of the negative electrode material. The composite electrolyte of the invention includes lithium salt, organic solvent and composite additives, and through the combination of components and proportions, an electrolyte suitable for alkali metal batteries is obtained.

Description

technical field [0001] The invention belongs to the field of lithium metal batteries, and in particular relates to a composite electrolyte for stabilizing lithium metal batteries. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) refer to a class of organic compounds with two or more benzenes, including more than 150 compounds such as naphthalene, anthracene, phenanthrene, and pyrene. Among them, disc-shaped PAHs have graphene microstructures and many excellent physical and chemical properties, and have broad application prospects in the fields of organic semiconductor materials, luminescent materials, solar cells, photodiodes, etc. In recent years, synthetic graphene microstructures have been synthesized. The polycyclic aromatic hydrocarbons have become a research hotspot in organic chemistry, physical chemistry and materials chemistry. [0003] Among lithium metal batteries, lithium-ion batteries drive the development of portable electronic devices and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/052
CPCH01M10/0567H01M10/0569H01M10/052H01M2300/0025H01M2300/0042Y02E60/10
Inventor 李爱东张会刚昌绍忠房佳斌金鑫
Owner NANJING UNIV
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