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A lithium-sulfur battery intercalated with c/ti4o7 composite fiber non-woven fabric

A composite fiber and lithium-sulfur battery technology, which is applied in the field of battery electrochemistry, can solve the problems that lithium-sulfur batteries are difficult to obtain long cycle life, reduce the energy density of lithium-sulfur batteries, and the conductivity of sulfur electrodes is limited. Control, easy industrial production, excellent electrochemical performance

Active Publication Date: 2018-09-25
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanostructure conductive carbon is difficult to fundamentally solve the problem of polysulfide dissolution during charging and discharging of lithium-sulfur batteries. Therefore, semiconductor nano-oxide additives have limited effect on improving the conductivity of sulfur electrodes.
At the same time, the low specific gravity of sulfur in the entire electrode due to semiconducting nano-oxide additives severely reduces the energy density of lithium-sulfur batteries.
[0004] In recent years, researchers have proposed a new battery structure, using a common sulfur cathode, and adding a layer of functional intercalation between the sulfur cathode and the separator—porous conductive carbon paper (Electrochimica Acta.2015, 168(20) :271-276), the porous conductive carbon paper can effectively inhibit the "shuttle effect" of polysulfides, and the discharge specific capacity of this type of lithium-sulfur battery at 2C is 416 mAh / g, but the porous carbon paper is only effective for polysulfides Physical adsorption makes it difficult for the lithium-sulfur battery to obtain a long cycle life

Method used

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  • A lithium-sulfur battery intercalated with c/ti4o7 composite fiber non-woven fabric
  • A lithium-sulfur battery intercalated with c/ti4o7 composite fiber non-woven fabric
  • A lithium-sulfur battery intercalated with c/ti4o7 composite fiber non-woven fabric

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Experimental program
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Effect test

Embodiment 1

[0041] A kind of C / Ti of the present invention 4 o 7 The composite fiber non-woven fabric is a lithium-sulfur battery intercalated, including a positive electrode containing a sulfur-containing active material (sublimed sulfur powder), a separator (polypropylene separator), an electrolyte (select 1mol / L bis(trifluoromethylsulfonphthalein) Lithium amine (LITFSI) is the electrolyte, the volume ratio of 1.3-dioxolane (DOL) to ethylene glycol dimethyl ether (DME) in the electrolyte solvent is 1:1, and 0.2Mol anhydrous lithium nitrate is added to the electrolyte) And lithium negative electrode (metal lithium), set a layer of C / Ti between the sulfur positive electrode and the polypropylene separator 4 o 7 Composite fiber non-woven fabric is used as battery intercalation, where C / Ti 4 o 7 The specific surface area of ​​the composite fiber non-woven fabric is 158m 2 / g, surface density is 1.48mg / cm 2 , with a thickness of 150 μm.

[0042] Wherein, in the present embodiment, C / T...

Embodiment 2

[0049] A kind of C / Ti of the present invention 4 o 7 The composite fiber non-woven fabric is an intercalated lithium-sulfur battery, including the positive electrode of the sulfur-containing active material (sublimed sulfur powder), the separator (polyethylene / polypropylene composite film with a pore size of 0.15 μm), and the electrolyte (choose 1mol / L two (Trifluoromethylsulfonphthalein) lithium imide (LITFSI) is the electrolyte, and the volume ratio of 1.3-dioxolane (DOL) to ethylene glycol dimethyl ether (DME) in the electrolyte solvent is 1:1, and the electrolyte Add 0.2mol anhydrous lithium nitrate) and lithium negative electrode (metal lithium), and set a layer of C / Ti between the sulfur positive electrode and the diaphragm 4 o 7 Composite fiber non-woven fabric is used as battery intercalation, where C / Ti 4 o 7 The specific surface area of ​​the composite fiber non-woven fabric is 118m 2 / g, surface density is 2.08mg / cm 2 , with a thickness of 223 μm.

[0050] Wh...

Embodiment 3

[0054] A kind of C / Ti of the present invention 4 o 7 The composite fiber non-woven fabric is intercalated lithium-sulfur battery, including the positive electrode of sulfur-containing active material (sedimented sulfur powder), separator (polypropylene membrane with a pore size of 0.10 μm), electrolyte (choose 1mol / L bis(trifluoromethyl) Sulfonphthalein) Lithium imide (LITFSI) is the electrolyte, the volume ratio of 1.3-dioxolane (DOL) to ethylene glycol dimethyl ether (DME) in the electrolyte solvent is 1:1, and 0.1mol anhydrous lithium nitrate) and lithium negative electrode (lithium metal), a layer of C / Ti is set between the sulfur positive electrode and the polypropylene separator 4 o 7 Composite fiber non-woven fabric is used as battery intercalation, where C / Ti 4 o 7The specific surface area of ​​the composite fiber non-woven fabric is 175m 2 / g, surface density is 1.33mg / cm 2 , with a thickness of 180 μm.

[0055] Wherein, in the present embodiment, C / Ti 4 o 7 ...

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Abstract

The invention discloses a lithium-sulfur battery intercalated with C / Ti4O7 composite fiber non-woven fabric, including a sulfur positive electrode, a separator, an electrolyte and a lithium negative electrode, and a layer of C / Ti4O7 is arranged between the sulfur positive electrode and the separator. Ti4O7 composite fiber non-woven fabric. The lithium-sulfur battery of the present invention uses C / Ti4O7 composite fiber non-woven fabric as a functional intercalation layer, and the C / Ti4O7 composite fiber non-woven fabric performs physical and chemical adsorption on polysulfides during charging and discharging, which solves the problem of existing In the technology, the porous carbon paper has a single physical adsorption of polysulfides. At the same time, the C / Ti4O7 composite fiber non-woven fabric can also be used as a "secondary current collector" during the charging and discharging process of lithium-sulfur batteries to improve the utilization of active materials during the cycle. Rate.

Description

technical field [0001] The invention relates to the field of battery electrochemistry, in particular to a C / Ti 4 o 7 The composite fiber non-woven fabric is a lithium-sulfur battery intercalated by the battery. Background technique [0002] Lithium-sulfur battery is a secondary battery that uses sulfur as the positive electrode active material and metal lithium as the negative electrode. Its theoretical energy density is as high as 2600Wh / Kg. And sulfur has the advantages of abundant resources, environmental friendliness, and low price. Therefore, lithium-sulfur batteries are the most promising candidates for next-generation green high-energy-density secondary batteries. However, there are still many thorny problems to be solved before lithium-sulfur batteries can be used commercially. For example, during the charge and discharge process of lithium-sulfur batteries, elemental sulfur reacts with negative lithium to form a series of polysulfides, which dissolve in the orga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052B82Y30/00H01M50/403H01M50/46H01M50/483
CPCH01M10/052B82Y30/00H01M50/431H01M50/44H01M50/403Y02E60/10
Inventor 姚山山唐豪沈湘黔侯金利吴潇景茂祥钱昕晔饶德伟廖达前习小明肖可颂
Owner CHANGSHA RES INST OF MINING & METALLURGY