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Lithium-sulfur batteries and their components, and the application of functional material layers in lithium-sulfur batteries

A functional material, lithium-sulfur battery technology, applied in battery pack components, lithium batteries, battery electrodes, etc., can solve problems such as unsatisfactory effects, and achieve improved electrochemical performance, large specific surface area, and multiple active sites. Effect

Inactive Publication Date: 2020-04-24
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is often found in practical applications that even with the above-mentioned transition metal oxides, the effect achieved in preventing lithium polysulfide shuttle is still not ideal.

Method used

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  • Lithium-sulfur batteries and their components, and the application of functional material layers in lithium-sulfur batteries
  • Lithium-sulfur batteries and their components, and the application of functional material layers in lithium-sulfur batteries
  • Lithium-sulfur batteries and their components, and the application of functional material layers in lithium-sulfur batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 1) Preparation of transition metal oxide-based functional material layer with crystal water: TiO 2 ·xH 2 O, Super P, and PVDF were added to N-methylpyrrolidone according to the mass ratio of 8:1:1 and mixed to form a slurry, and then the slurry was coated on one side of the polypropylene diaphragm by casting method, and then The slurry was vacuum-dried at 60° C. for 10 hours to obtain a composite separator with a transition metal oxide-based functional material layer with crystal water (hereinafter referred to as PP@C&HTO-1). Scanning electron microscope (SEM) image of functional material layer in PP@C&HTO-1 image 3 shown.

[0059] 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&HTO-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 concentra...

Embodiment 2

[0065] Same as embodiment 1, the difference is only the TiO in embodiment 1 2 ·xH 2 O is replaced by H 2 Ti 3 o 7 , and replace the tape casting method with a doctor blade coating method to obtain a composite separator with a transition metal oxide coating (hereinafter referred to as PP@C&HTO-2), assemble the same 2032-type button cell as in Example 1, the difference is only in Replace PP@C&HTO-1 with PP@C&HTO-2.

[0066] Scanning electron microscope (SEM) image of functional material layer in PP@C&HTO-2 Figure 7 shown.

[0067] Testing of battery electrochemical performance

[0068] Adopt LAND battery test system to carry out constant current charge and discharge cycle in the voltage range of 2.7V and 1.8V respectively in charge and discharge cut-off voltage, test the electrochemical cycle characteristics of the button cell of embodiment 1-2 and comparative example 1-2, The test data of the battery is shown in Table 1. Figure 4 It is a comparison chart of the cycle ...

Embodiment 3

[0076] 1) Preparation of transition metal oxide-based functional material layer with crystal water: the MoO 3 ·xH 2 O, Ketjen Black and PVDF are added into the ethanol solvent according to the mass ratio of 7:2:1 and mixed into a slurry, then use spin coating to coat the above-mentioned slurry on both sides of the polyethylene diaphragm, and then apply the slurry at 80 After vacuum drying at ℃ for 10 hours, a composite separator with a transition metal oxide-based functional material layer with crystal water (hereinafter referred to as PE@C&HMO-3) was obtained.

[0077] 2) Assembly of lithium-sulfur battery: the same as in Example 1, the only difference is that PP@C&HTO-1 is replaced by PE@C&HMO-3.

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Abstract

The invention provides a lithium sulfur battery, which comprises a sulfur-based positive electrode, a lithium-based negative electrode, a diaphragm and a functional material layer, wherein the diaphragm 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 transition metal oxides with crystal water. The invention also provides application of the composite diaphragm, the lithium sulfur battery assembly, the composite sulfur-based positive electrode, the composite lithium-based negative electrode and the functional material layer to 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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M4/13H01M4/134H01M4/36H01M4/62H01M10/052H01M10/42
CPCH01M4/13H01M4/134H01M4/366H01M4/628H01M10/052H01M10/4235H01M50/431Y02E60/10
Inventor 唐子龙李巨王诗童
Owner TSINGHUA UNIV
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