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A kind of pyrrole surface-treated lithium electrode and its lithium-sulfur battery

A technology of lithium-sulfur battery and lithium electrode, which is applied in the field of pyrrole surface-treated lithium electrode and lithium-sulfur battery, can solve the problems of accelerated battery capacity decline, reduced lithium ion conductivity, and affecting the utilization rate of sulfur in the electrode. Avoid fluctuations in battery performance, broad industrialization prospects, and beneficial effects on quality management

Inactive Publication Date: 2017-05-31
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
The more electrolyte solution is added, the more polysulfide ions are dissolved, and the more polysulfide ions are migrated, resulting in faster battery capacity decline.
However, the amount of electrolyte added to the battery is too small, which directly leads to the reduction of lithium ion conductivity.
Not only is the high-rate discharge performance poor, but the internal resistance of the battery will also increase, which will also affect the utilization of sulfur in the electrode, resulting in a decrease in battery capacity.

Method used

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  • A kind of pyrrole surface-treated lithium electrode and its lithium-sulfur battery
  • A kind of pyrrole surface-treated lithium electrode and its lithium-sulfur battery
  • A kind of pyrrole surface-treated lithium electrode and its lithium-sulfur battery

Examples

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Effect test

Embodiment 1

[0036] Example 1: preparation of tetrahydrofuran solution of pyrrole

[0037] 0.5 mole of pyrrole was dissolved in 1 liter of tetrahydrofuran (THF), and stirred evenly to obtain pyrrole THF solution.

Embodiment 2

[0038] Example 2: Preparation of macroporous carbon

[0039] According to the mass ratio of 1:1, weigh the hydrophilic nano-CaCO produced by Ruicheng Warner Nano Materials Co., Ltd., with a particle size of 15-40nm. 3 Add 10g of glucose and 10g each to 100ml deionized water, mix with ultrasonic vibration for 30 minutes to dissolve glucose and mix with nano-CaCO 3 Disperse evenly; heat to evaporate the water, and then solidify at 160°C for 6 hours; raise the temperature of the cured product to 900°C under the protection of nitrogen atmosphere, and carbonize at constant temperature for 2 hours; the carbonized product is washed with 5wt% nitric acid and deionized water in sequence, After drying at a constant temperature of 120° C. for 4 hours, a macroporous carbon material was obtained.

Embodiment 3

[0040] Example Three: Preparation of Positive Electrode Material

[0041] The elemental sulfur and the macroporous carbon obtained in Example 2 were mechanically mixed at a mass ratio of 7:3, placed in a reactor made of 316 stainless steel, and then heated to 80° C. after the reactor was evacuated, and reacted for 5 hours. After the sulfur loading is completed, the reaction product is cooled to 25° C. to obtain the positive electrode material.

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Abstract

The invention relates to the field of batteries and aims to provide a pyrrole surface-treated lithium electrode and a lithium-sulfur battery thereof. The electrode material side of the positive pole of the lithium-sulfur battery is opposite to the surface treatment layer of the negative electrode with a diaphragm; the diaphragm is a modified non-porous polypropylene diaphragm, and one side of the diaphragm has a conductive layer bonded with acetylene black by PVP modified Li+ type Nafion resin; The positive electrode is prepared using PVP modified Li+ type Nafion resin binder. The present invention uses PVP modified Li+ type Nafion resin binder and pyrrole surface-treated lithium-sulfur battery for metal lithium negative electrode, which reduces the sensitivity of lithium-sulfur battery capacity decline to electrolyte addition, and improves the charge-discharge cycle of lithium-sulfur battery While improving the lifespan and high-rate charge-discharge performance, it is also conducive to the quality management of lithium-sulfur batteries in industrial production. It avoids battery performance fluctuations caused by errors in the amount of electrolyte added during battery assembly, improves the consistency of lithium-sulfur battery performance, and is conducive to mass production quality management. The cost of the electrode material is low, the preparation process is simple and easy, and it has broad industrialization prospects.

Description

technical field [0001] The invention relates to the field of batteries, and relates to a lithium-sulfur battery using a surface-treated metal lithium negative electrode and a modified lithium-ion conductive polymer material as a binder, in particular to the surface treatment of metal lithium by tetrahydrofuran solution of pyrrole, on the surface of metal lithium Lithium metal that forms pyrrole lithium is used as the negative electrode, and then during the charging process of the lithium-sulfur battery, a lithium-sulfur battery in which a protective layer of polypyrrole lithium is formed on the surface of the negative electrode. It effectively prevents the polysulfide ions generated during the charging and discharging process of the lithium-sulfur battery from reacting with metallic lithium, and improves the cycle life of the lithium-sulfur battery. Background technique [0002] Lithium-sulfur battery is a kind of lithium-ion battery. Sulfur is used as the positive electrode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M4/134H01M4/1395H01M10/058
CPCH01M4/134H01M4/1395H01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 李洲鹏汪倩倩刘宾虹
Owner ZHEJIANG UNIV