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Application of a functionalized carbon dot in lithium battery electrolyte

An electrolyte and lithium battery technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as excessive charging current, lithium dendrite growth, battery short circuit, etc., to inhibit growth and improve Effect of safety and stability, excellent electrochemical performance

Active Publication Date: 2022-06-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high reactivity of lithium metal and excessive charging current, lithium dendrites will inevitably grow on the negative electrode of lithium batteries during charging.
Too long lithium dendrites will pierce the separator and cause a short circuit in the battery, which will lead to serious safety accidents

Method used

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  • Application of a functionalized carbon dot in lithium battery electrolyte
  • Application of a functionalized carbon dot in lithium battery electrolyte
  • Application of a functionalized carbon dot in lithium battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Preparation of nitrogen and sulfur co-doping functionalized carbon dots

[0032] Weigh 4.0 g of thiourea and 40 mL of acetaldehyde (35 wt %) into a beaker, ultrasonically treat for 1 h to completely dissolve thiourea, and add 200 μL of concentrated sulfuric acid as a catalyst. The above mixture was transferred to a 100 mL hydrothermal reactor and heated at 180 °C for 6 h. After the reaction was completed, it was naturally cooled to room temperature, and the resulting brown viscous material was transferred to 2 L of deionized water, and sonicated continuously until the product was uniformly dispersed. The filter cake (ie, carbon dots) was collected by filtration through a microporous membrane (pore size was 0.22 μm), and then the carbon dots were washed with deionized water and suction filtered for several times to remove impurities. After drying in an oven at 60°C for 12 hours, nitrogen and sulfur co-doped functionalized carbon dot powders were collected.

...

Embodiment 2

[0036] The preparation of embodiment 2 electrolyte

[0037] S1. Under an inert atmosphere, the organic solvent 1,3-dioxolane (DOL) / ethylene glycol dimethyl ether (DME) is mixed in a volume ratio of 1:1 to prepare an electrolyte solvent;

[0038] S2. In an inert atmosphere, the functionalized carbon dot powder prepared in Example 1 and the lithium salt lithium bis-trifluoromethylsulfonimide (LiTFSI) were dissolved in the solvent prepared in step S1, and 2wt% LiNO was added. 3 , stir evenly, and prepare an electrolyte; wherein, the concentration of LiTFSI is 1.0 mol / L, and the concentration of functionalized carbon dots is 0.3 mg / mL.

[0039] Electrochemical performance test:

[0040](1) The lithium metal sheet was used as the negative electrode, the copper foil was used as the positive electrode, and 40 μL of the electrolyte prepared above was dropped on both sides of the PE separator to assemble the Li / Cu half-cell. At a current density of 1 mA cm -2 , the discharge capacit...

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Abstract

The present invention provides the application of functionalized carbon dots in lithium battery electrolyte, including the step of mixing functionalized carbon dots as additives with lithium salt electrolyte and electrolyte solvent to prepare electrolyte; wherein, the functionalized carbon dots are Carbon dots doped with one or more than two kinds of N, S, P, F, B, Cl elements, the mass concentration of the functionalized carbon dots in the electrolyte is 0.1-5.0 mg / mL . In the present invention, multifunctional carbon dots doped with at least one element of N, S, P, F, B, and Cl are used as additives in the lithium battery electrolyte. When the battery is charging, the functionalized carbon dots First anchor on the surface of the negative electrode, deposit on the surface of the current collector, uniform the surface structure of the current collector, and then uniform the electric field at the electrode-electrolyte interface, standardize the deposition behavior of lithium ions on the surface of the negative electrode, and inhibit the growth of irregular lithium dendrites , Improve the safety and stability of lithium batteries.

Description

technical field [0001] The invention relates to the application field of functionalized carbon dots, and more particularly, to the application of functionalized carbon dots in lithium battery electrolyte. Background technique [0002] As a new type of zero-dimensional carbon material, carbon dots have shown great application prospects in the fields of energy storage, fluorescence anti-counterfeiting, and biological imaging due to their excellent physical and chemical properties. At present, the preparation methods of carbon dots can be divided into two categories: "bottom-up method" and "top-down method". The bottom-up method refers to the formation of carbon dots by peeling or etching large-sized carbon targets by chemical and physical means. The specific methods include: laser ablation method, arc discharge method, acid reflux method, etc. The bottom-up rule refers to the formation of carbon dots by small molecular precursors under high temperature and high pressure to fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235Y02E60/10
Inventor 侯红帅李硕纪效波邹国强罗政
Owner CENT SOUTH UNIV
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