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A lithium-sulfur battery

A lithium-sulfur battery and lithium salt technology, applied in the field of electrochemical energy storage, can solve the problems of deterioration of battery cycle performance and limited lithium-sulfur battery, and achieve the effects of improving utilization rate and cycle stability and reducing losses

Active Publication Date: 2018-06-15
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charging and discharging process, elemental sulfur will be converted into polysulfides, and polysulfides will be dissolved in the liquid organic electrolyte, and the loss of these active substances will lead to the deterioration of the battery cycle performance, resulting in the lithium-sulfur battery being used in practical applications. limited in application
Although it has been found that in the all-solid-state battery structure, the solid-solid contact can prevent the dissolution of polysulfides formed by the electrode reaction in the lithium-sulfur battery, but in the existing lithium-sulfur battery system, the matching of the electrolyte and the battery is still There are some problems, so it is necessary to find a new lithium-sulfur battery system to further improve the cycle performance of the battery

Method used

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  • A lithium-sulfur battery

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Electrolyte preparation: first dissolve LiTFSI in 99.8% acetonitrile at room temperature, after LiTFSI is completely dissolved in acetonitrile, the molecular weight is 1×10 6 Add PEO, dissolve at 60°C for 12 hours, the molar ratio of EO groups in PEO to Li in LiTFSI is 20:1; then add 5% nano-clay particles, ultrasonically disperse and stir to obtain a homogeneous solution. At 60°C in vacuum, the solution was poured into a Teflon pan to volatilize the solvent. After the solvent was completely volatilized, a mixed film of PEO and LiTFSI was obtained. The film was baked at 120°C for 2 hours to obtain PEO-LiTFSI-nano Clay polymer film.

[0047] Preparation of positive electrode: Dissolve 4g of elemental sulfur in 30cm 3 CS 2 In , PAN was dissolved in DMF, followed by CS containing elemental sulfur 2 solution, DMF solution containing PAN, and Mg 0.6 Ni 0.4 O was mixed and put into a ball mill for ball milling, the speed of the ball mill was 800 rpm, and the ball milling...

Embodiment 2

[0053] Preparation of electrolyte: same as in Example 1

[0054] Preparation of the positive electrode: the difference from Example 1 is: in the preparation process, PAN / S / Mg before heat treatment 0.4 Ni 0.6 O content ratio is S:PAN:Mg 0.4 Ni 0.6 O=4:1:0.6.

[0055] Preparation of the battery: The prepared positive electrode sheet was used as the positive electrode, metal lithium was used as the negative electrode, and the PEO-LiTFSI-nanoclay polymer film was used as the electrolyte and separator, and a CR2032 button battery was assembled in a glove box filled with argon.

Embodiment 3

[0057] Preparation of electrolyte: same as in Example 1

[0058] Preparation of positive electrode: Dissolve 4g of elemental sulfur in 30cm 3 CS 2 In , PAN was dissolved in DMF, followed by CS containing elemental sulfur 2 solution, the DMF solution containing PAN were mixed and put into a ball mill for ball milling, the rotating speed of the ball mill was 800 rpm, and the ball milling time was 2 hours, and then the obtained product was vacuum-dried at 65° C. for 3 hours to remove the solvent therein, and then The dried product was heated under argon protection at 350 °C for 3 hours, and finally cooled naturally to obtain the composite cathode material PAN / S. During the preparation process, the content ratio of PAN / S before heat treatment is S:PAN=4:1. Mix the composite positive electrode material PAN / S, the conductive agent acetylene black (AB), LiTFSI and the binder PEO in a mass ratio of 55:25:15:5, add N-methylpyrrolidone as a solvent, and pass the obtained slurry throu...

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PUM

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Abstract

The invention provides a lithium sulfur battery comprising a positive electrode, a negative electrode and an electrolyte; the positive electrode comprises a positive electrode active material comprising a composite positive electrode material; the negative electrode comprises a negative electrode active material; the electrolyte is in an all solid state and comprises polyethylene oxide, a lithium salt and an inert filling material. In the lithium sulfur battery provided by the invention, the all-solid-state electrolyte is in combined use with the positive electrode active material, dissolution of an intermediate product polysulfide lithium can be better suppressed in lithium sulfur battery charging and discharging processes, the loss of elemental sulfur in the composite positive electrode material is reduced, and the utilization rate of the positive electrode active material and the cycle performance of the battery are improved.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to a lithium-sulfur battery. Background technique [0002] In recent years, with the development of science and technology, the demand for energy, especially renewable green energy, has become more and more prominent. As an energy storage and conversion device, batteries are playing an irreplaceable role. Lithium-ion batteries have attracted extensive attention due to their high mass-specific energy and volume-specific energy. Low cost, high energy density, long cycle life, and green secondary batteries are the focus of lithium-ion battery development at present. [0003] The current commercial positive electrode materials are mainly layered or spinel-structured lithium transition metal oxides (such as lithium cobaltate, lithium manganate) and olivine-structured lithium iron phosphate. Lithium cobalt oxide (LiCoO 2 ) has a relatively large theoretical cap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M10/0565H01M4/13
CPCH01M4/13H01M10/052H01M10/0565Y02E60/10
Inventor 陈璞钊妍
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD