Electrolyte and lithium metal battery

A lithium metal battery and electrolyte technology, applied in the direction of non-aqueous electrolyte batteries, lithium batteries, secondary batteries, etc., can solve the problems that hinder the commercialization process of lithium metal batteries, reduce battery cycle performance, and have many side reactions, and achieve improvement Safety performance and cycle stability, improving safety performance and cycle stability, optimizing composition and structure

Active Publication Date: 2021-02-09
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium metal batteries face a series of problems caused by uneven deposition of lithium. For example, lithium metal anodes are prone to generate lithium dendrites during charging and discharging, and have many side reactions with the electrolyte, which reduces the cycle performance of the battery, and even lithium dendrites The crystal pierces the separator and contacts the positive electrode, resulting in an internal short circuit. In severe cases, it will cause safety accidents such as fire and explosion, which hinders the commercialization of lithium metal batteries.

Method used

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  • Electrolyte and lithium metal battery
  • Electrolyte and lithium metal battery
  • Electrolyte and lithium metal battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Preparation of positive electrode

[0058] The positive electrode active material LiFePO 4 , conductive carbon black and binder PVDF are dispersed in the solvent NMP according to the mass ratio of 96:2:2 and mixed uniformly to obtain the positive electrode slurry; the positive electrode slurry is evenly coated on the positive electrode current collector aluminum foil, dried, cooled After pressing, slitting, and cutting into pieces, the positive electrode is obtained.

[0059] Preparation of negative electrode

[0060] A 140 μm thick lithium metal sheet was used as the negative electrode.

[0061] Separator

[0062] Use PE isolation film.

[0063] Electrolyte preparation

[0064] With the compound shown in formula 1-1 as solvent, LiNO 3 Dissolve in the solvent, mix uniformly, obtain electrolyte solution, wherein LiNO 3 The concentration is 1mol / L.

[0065] Preparation of lithium metal batteries

[0066] The above-mentioned positive electrode, separator a...

Embodiment 2～13 and comparative example 1～6

[0068] The difference from Example 1 is that the type of positive electrode active material and related parameters in the preparation steps of the electrolyte were adjusted, see Table 1 for details.

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Abstract

The invention discloses an electrolyte solution and a lithium metal battery. The electrolyte solution includes an electrolyte and a solvent, the electrolyte includes lithium nitrate, the solvent includes a first solvent, and the first solvent is a compound represented by the general formula, wherein R 1 and R 2 Each independently represents a hydrocarbon group having 1 to 6 carbon atoms. The electrolyte solution provided by the invention enables the lithium metal battery to take into account both high safety performance and cycle performance.

Description

technical field [0001] The present application belongs to the technical field of batteries, and in particular relates to an electrolyte and a lithium metal battery containing the electrolyte. Background technique [0002] Lithium metal has a very high theoretical specific capacity (3860mAh / g) and an extremely low electrochemical potential (-3.045V). Using lithium metal as the negative electrode makes lithium metal batteries have extremely high energy density. However, lithium metal batteries face a series of problems caused by uneven deposition of lithium. For example, lithium metal anodes are prone to generate lithium dendrites during charging and discharging, and have many side reactions with the electrolyte, which reduces the cycle performance of the battery, and even lithium dendrites The crystal pierces the separator and contacts the positive electrode, resulting in an internal short circuit. In severe cases, it will cause safety accidents such as fire and explosion, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569H01M10/0568H01M10/052
CPCH01M10/052H01M10/0568H01M10/0569Y02E60/10
Inventor 程萌郭永胜刘成勇周晶晶梁成都杨军
Owner CONTEMPORARY AMPEREX TECH CO
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