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Lithium-sulfur battery, assembly thereof and application of functional material layer in lithium-sulfur battery

A functional material, lithium-sulfur battery technology, applied to battery components, battery electrodes, lithium batteries, etc., can solve problems such as unsatisfactory effects, and achieve the effects of improving electrochemical performance, inhibiting shuttle, and large specific surface area

Inactive Publication Date: 2018-01-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is often found in practical applications that even with the above-mentioned transition metal compounds, the effect achieved in preventing lithium polysulfide shuttle is still unsatisfactory.

Method used

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  • Lithium-sulfur battery, assembly thereof and application of functional material layer in lithium-sulfur battery
  • Lithium-sulfur battery, assembly thereof and application of functional material layer in lithium-sulfur battery
  • Lithium-sulfur battery, assembly thereof and application of functional material layer in lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] 1) Preparation of Li-H-M-O system compound-based functional material layer: Li 1.81 h 0.19 Ti 2 o 5-σ (σ represents oxygen vacancies), Super P and PVDF were added to N-methylpyrrolidone at a mass ratio of 8:1:1 and mixed to form a slurry, and then coated on one side of the polypropylene separator by casting method The above slurry was then vacuum-dried at 60°C for 10 hours to obtain a composite separator with a Li-H-Ti-O system compound-based functional material layer (hereinafter referred to as PP@C&LHTO-1). Scanning electron microscope (SEM) image of functional material layer in PP@C&LHTO-1 image 3 shown.

[0077] 2) Assembly of lithium-sulfur battery: Sublimated sulfur is used to prepare sulfur positive electrode, metal lithium sheet is used as negative electrode, PP@C&LHTO-1 is used as separator, and electrolyte is LiTFSI and LiNO 3 The mixed solution formed in the mixed solvent of DME and DOL (the volume ratio of DME and DOL is 1:1, the concentration of LiTFS...

Embodiment 2

[0091] 1) Preparation of functional material layer with Li-H-M-O system compound: Li 0.71 h 0.49 mn 1.73 o 3.88 , Ketjen Black, and PVDF were added to ethanol solvent at a mass ratio of 7:2:1 and mixed to form a slurry, and then the above slurry was coated on both sides of the polyethylene diaphragm by spin coating, and then the slurry was heated at 80°C After drying under vacuum for 10 hours, a composite separator with a Li-H-Mn-O system compound-based functional material layer (hereinafter referred to as PE@C&LHMO-2) was obtained.

[0092] 2) Assembly of lithium-sulfur battery: the same as in Example 1, the only difference is that PP@C&LHTO-1 is replaced by PE@C&LHMO-2.

Embodiment 3

[0094] 1) Preparation of functional material layer with Li-H-M-O system compound: 7Li 2 WO 4 4H 2 O, acetylene black, and LA were added to deionized water at a mass ratio of 85:15:5 and mixed to form a slurry, and then the polyethylene-polypropylene double-layer diaphragm was coated on one side with the suction filtration (filtration) coating method. slurry, and then vacuum-dried the slurry at 80°C for 10 hours to obtain a composite separator with a Li-H-W-O system compound-based functional material layer (hereinafter referred to as PE / PP@C&LHWO-3).

[0095] 2) Lithium-sulfur battery assembly: the same as in Example 1, the only difference is that the sublimated sulfur is replaced by a sulfur-carbon composite material, and PP@C&LHTO-1 is replaced by PE / PP@C&LHWO-3.

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Abstract

The invention provides a lithium-sulfur battery. The lithium-sulfur battery comprises a sulfur-based positive electrode, a lithium-based negative electrode, a separator and a functional material layer, wherein the separator is arranged between the sulfur-based positive electrode and the lithium-based negative electrode, the functional material layer is arranged between the sulfur-based positive electrode and the lithium-based negative electrode, the material of the functional material layer comprises a Li-H-M-O system compound containing elements of Li, H, M and O, and M is a transition metalelement. The invention also provides a composite separator, a lithium-sulfur battery electrode assembly, a composite sulfur-based positive electrode, a composite lithium-based negative electrode and application of the functional material layer in the lithium-sulfur battery.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to the application of lithium-sulfur batteries, composite separators, lithium-sulfur battery electrode assemblies, composite sulfur-based positive electrodes, composite lithium-based negative electrodes and functional material layers in lithium-sulfur batteries. Background technique [0002] With the rapid development of the new energy automobile industry, the development of energy storage devices with high energy density has become an important direction of current research and development. With its theoretical specific capacity of 1675mAh / g and theoretical energy density of ~2500Wh / kg, lithium-sulfur batteries have become one of the most promising power battery systems to replace traditional lithium-ion batteries and achieve long-range battery life (>500Wh / kg). . However, due to the current problems of low cycle life and poor safety and stability of lithium-sulfur batteries, i...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M4/13H01M4/134H01M10/052H01M50/443H01M50/46
CPCH01M4/13H01M4/134H01M10/052Y02E60/10H01M50/443
Inventor 唐子龙王诗童
Owner TSINGHUA UNIV
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