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A high-safety, high-energy quasi-solid-state lithium secondary battery based on lithium sulfide positive electrode and its preparation method

A lithium secondary battery, quasi-solid-state technology, applied in the direction of secondary batteries, positive electrodes, battery electrodes, etc., can solve problems that plague the creation and application of secondary batteries, battery leakage, flatulence, and electrode dissolution, etc., to achieve improved battery performance. Safety, ensuring battery performance, and avoiding safety risks

Active Publication Date: 2022-03-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, problems such as battery leakage, flatulence and electrode dissolution caused by the use of flammable liquid electrolytes in traditional battery systems still greatly plague the creation and application of high-performance lithium secondary batteries based on lithium sulfide cathodes.

Method used

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  • A high-safety, high-energy quasi-solid-state lithium secondary battery based on lithium sulfide positive electrode and its preparation method
  • A high-safety, high-energy quasi-solid-state lithium secondary battery based on lithium sulfide positive electrode and its preparation method
  • A high-safety, high-energy quasi-solid-state lithium secondary battery based on lithium sulfide positive electrode and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Preparation of cathode material

[0040] 1.1 Dissolve lithium sulfide in ethanol to form a homogeneous solution with a concentration of 10mg mL -1 ;

[0041] 1.2 In the glove box (water content <0.1ppm, oxygen content <0.1ppm), slowly drop the lithium sulfide solution obtained in step 1.1 on the porous carbon fiber to form a composite positive electrode material. The lithium sulfide loading in the obtained positive electrode material is 60wt.%.

[0042] 2. Preparation of negative electrode materials

[0043] Si nanoparticles, porous carbon fibers and binders are formulated into a slurry at a ratio of 7:2:1, coated on metal copper foil, and dried to obtain a composite positive electrode material. The binder is polyvinylidene fluoride. The positive electrode material loading is 50wt.%.

[0044] 3. Preparation of gel polymer-based electrolyte

[0045] Polyethylene oxide and lithium bistrifluoromethanesulfonimide are dissolved in a mixed solvent of 1,3 dioxolane an...

Embodiment 2

[0050] 1. Preparation of cathode material

[0051] 1.1 Dissolve lithium sulfide in ethanol to form a homogeneous solution with a concentration of 25mg mL -1 ;

[0052] 1.2 In a glove box (water content <0.1ppm, oxygen content <0.1ppm), slowly drop the lithium sulfide solution obtained in step 1.1 onto acetylene black to form a composite positive electrode material. The lithium sulfide loading in the obtained positive electrode material is 67.5wt.%.

[0053] 2. Preparation of negative electrode materials

[0054] The silicon nanoparticles, acetylene black and binder are formulated into a slurry at a ratio of 7:2:1, coated on metal copper foil, and dried to obtain a composite positive electrode material. The binder is polyvinylidene fluoride. The positive electrode material loading is 62.5wt.%.

[0055] 3. Preparation of gel polymer-based electrolyte

[0056] Polyethylene oxide and lithium bistrifluoromethanesulfonimide are dissolved in a mixed solvent of 1,3 dioxolane and...

Embodiment 3

[0061] 1. Preparation of cathode material

[0062] 1.1 Dissolve lithium sulfide in ethanol to form a homogeneous solution with a concentration of 40mg mL -1 ;

[0063] 1.2 In a glove box (water content <0.1ppm, oxygen content <0.1ppm), slowly drop the lithium sulfide solution obtained in step 1.1 onto acetylene black to form a composite positive electrode material. The lithium sulfide loading in the obtained positive electrode material is 75wt.%.

[0064] 2. Preparation of negative electrode materials

[0065] Prepare ferric oxide nanoparticles, porous carbon fibers and binders in a ratio of 7:2:1 to make a slurry, coat the metal copper foil, and dry to obtain a composite positive electrode material. The binder is polyvinylidene fluoride. The positive electrode material loading is 75wt.%.

[0066] 3. Preparation of gel polymer-based electrolyte

[0067] Polyethylene oxide and lithium bistrifluoromethanesulfonimide are dissolved in a mixed solvent of 1,3 dioxolane and eth...

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Abstract

A high-safety, high-energy quasi-solid-state lithium secondary battery based on a lithium sulfide positive electrode and a preparation method thereof belong to the technical field of new energy. The quasi-solid lithium secondary battery consists of a lithium sulfide / carbon composite positive electrode, a lithium storage material / carbon composite negative electrode and a polymer gel electrolyte. Preparation method: prepare positive and negative electrode materials by solution titration evaporation or coating scraping film, and then add polymer gel electrolyte to assemble quasi-solid lithium secondary battery. The quasi-solid lithium secondary battery prepared by the present invention is based on redox reaction energy storage, and the energy density can reach 802Wh kg ‑1 . At the same time, the battery can avoid thermal runaway under various conditions such as puncture and overheating, and the LED light string can still light up after puncture, showing excellent safety performance.

Description

technical field [0001] The invention belongs to the technical field of new energy, and relates to a high-safety, high-energy quasi-solid-state lithium secondary battery based on a lithium sulfide positive electrode, a preparation method and an application thereof. Background technique [0002] Lithium-ion batteries have been widely used in the field of electronic consumption, but their low energy density is still difficult to meet the needs of high-energy consumption applications such as high-power portable devices and long-range electric vehicles. Lithium metal battery is the electrochemical energy storage technology with the highest energy density, but the matching use of highly active metal lithium and flammable liquid electrolyte in this type of battery may cause serious safety risks, making it safe in manned vehicles, space technology, etc. It is difficult to be practically applied in fields with outstanding performance and reliability requirements. Therefore, it is pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/136H01M4/1397H01M4/36H01M4/58H01M4/583H01M10/0565
CPCH01M4/136H01M4/1397H01M4/362H01M4/5815H01M4/583H01M10/0565H01M2004/028H01M2004/027Y02E60/10
Inventor 王治宇孟祥玉邱介山刘钰昭
Owner DALIAN UNIV OF TECH
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