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Diaphragm for lithium-sulfur batteries and preparation method of lithium-sulfur batteries

A lithium-sulfur battery and membrane technology, applied in the field of preparation of lithium-sulfur battery membrane and lithium-sulfur battery, can solve the problems of lithium-sulfur battery capacity decline, capacity loss, capacity decline, etc., and achieve good chemical stability and thermal stability , high safety and reliability, and the effect of eliminating the possibility of reaction

Inactive Publication Date: 2014-11-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the biggest problem of lithium-sulfur batteries is that lithium polysulfide dissolved in the electrolyte is formed during charging and discharging, and the dissolved lithium polysulfide reacts with lithium metal in the negative electrode, causing capacity loss, which leads to a rapid decline in the capacity of lithium-sulfur batteries, showing extreme poor cycle life
But Li + The concentration of lithium ions in the Nafion-type membrane is limited, and polysulfide ions will also be adsorbed, resulting in the loss of positive active materials and capacity decline.
And Li + The strength of the Nafion-type membrane is weak, and it cannot resist the formation of dendrites on the lithium electrode, which will cause the diaphragm to penetrate and cause a short circuit.
In addition, Li + Type Nafion membrane has poor electrolyte absorption capacity and high internal resistance, which is not conducive to high current charging and discharging

Method used

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  • Diaphragm for lithium-sulfur batteries and preparation method of lithium-sulfur batteries

Examples

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preparation example Construction

[0035] A method for preparing a lithium-sulfur battery separator specifically includes the following steps:

[0036] (1) Take 100mL of N-methylpyrrolidone (NMP) and add 3~10g Li + -After Nafion resin and 3~10g PVP resin are stirred and dissolved, 1g polyolefin fiber is added, and after ultrasonic vibration (ultrasonic frequency 40kHz) is dispersed for 30 minutes, then 0.5~5g nano metal sulfide is added, and ultrasonic vibration (ultrasonic frequency 40kHz) is dispersed 2 After hours, pour it into a membrane maker and heat it to 90°C to slowly evaporate NMP. After heating at 90°C for 20 hours, a metal sulfide-containing polyolefin fiber reinforced lithium ion exchange membrane is obtained;

[0037] Among them, Li + -The preparation method of Nafion resin is: take 100mL Nafion solution (20wt%, produced by DuPont), add 10g LiOH, stir for 30 minutes, centrifuge to separate the excess LiOH to obtain Li + -Nafion solution, Li can be obtained after spray drying + -Nafion resin powder. The...

Embodiment 1

[0047] Example 1 Preparation of Nano Metal Sulfide

[0048] Weigh copper nitrate (0.1 mol) and add it to a reactor containing 100mL deionized water, add a stir bar, stir to dissolve, add 2g PVP and stir to dissolve, weigh sodium sulfide according to the molar ratio of copper nitrate to sodium sulfide 1:1 (0.1 mol) was added to the reactor, stirred and reacted for 30 minutes to obtain nano-copper sulfide, filtered, rinsed with deionized water and dried to obtain nano-copper sulfide powder.

[0049] Substituting equimolar amounts of zinc nitrate and tin nitrate to replace the copper nitrate, and following the above steps to obtain nano zinc sulfide and nano tin sulfide powders, respectively.

Embodiment 2

[0050] Example 2Li + -Nafion powder preparation

[0051] Add 10g LiOH to 100mL of Nafion solution (20wt%). After stirring for 30 minutes, centrifuge to separate the excess LiOH to obtain Li + -Nafion solution, get Li after spray drying + -Nafion resin powder.

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Abstract

The invention relates to the technical field of lithium-sulfur batteries, and aims to provide a diaphragm for lithium-sulfur batteries and a preparation method of lithium-sulfur batteries. The preparation method of the diaphragm for lithium-sulfur batteries comprises the following steps: respectively preparing a polyolefin fiber reinforced lithium ion exchange membrane containing metal sulfide and a poly-lithium sulfide solution, and mixing the polyolefin fiber reinforced lithium ion exchange membrane containing metal sulfide and the poly-lithium sulfide solution so as to obtain a metal sulfide containing & poly-lithium sulfide doped & polyolefin fiber reinforced diaphragm for lithium-ion batteries; and a lithium-sulfur battery comprises electrolyte, a cathode, an anode and the prepared diaphragm for lithium-sulfur batteries. The metal sulfide containing & polyolefin fiber reinforced lithium ion exchange membrane prepared according to the invention has an extremely low internal resistance, good chemical stability and thermal stability and excellent cycle characteristic; and the diaphragm is simple in manufacturing process and pollution-free, and high in safety and high reliability.

Description

Technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a lithium-sulfur battery diaphragm and a method for preparing the lithium-sulfur battery. Background technique [0002] Lithium-sulfur battery is a kind of lithium-ion battery. Sulfur is used as the positive electrode material of the battery, which has the advantages of light weight, large capacity, and no memory effect. The specific energy of lithium-sulfur batteries is much higher than that of lithium-ion batteries that are widely used commercially. Moreover, sulfur is an environmentally friendly element and basically does not pollute the environment. Lithium-sulfur battery is a very promising lithium-ion battery. [0003] Lithium-sulfur batteries use metal lithium as the negative electrode material and use a liquid electrolyte. During discharge, the negative electrode reacts as lithium loses electrons and becomes lithium ions. The positive electrode reacts as sulfu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/00H01M2/16H01M10/052
CPCY02E60/10
Inventor 李洲鹏李高然刘宾虹
Owner ZHEJIANG UNIV
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