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High lithium ion conductivity lithium sulphur battery capable of restraining shuttle of polysulfide ions

A lithium-sulfur battery, ion conduction technology, applied in non-diaphragm lithium-sulfur batteries, modification of lithium-ion conductive polymer materials, binders, and sulfur electrodes, can solve the problem of unable to prevent polysulfide ion shuttle, lithium-sulfur battery capacity Recession, sulfur electrode capacity decline and other problems, to achieve the effect of lithium ion conduction and inhibition of polysulfide ion shuttle strengthening, inhibition of capacity decline, speed capacity and performance stability improvement

Inactive Publication Date: 2015-11-11
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
Conventional binders such as polyvinylidene fluoride (PVDF) cannot prevent the shuttling of polysulfide ions, resulting in a rapid decline in the capacity of sulfur electrodes

Method used

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  • High lithium ion conductivity lithium sulphur battery capable of restraining shuttle of polysulfide ions
  • High lithium ion conductivity lithium sulphur battery capable of restraining shuttle of polysulfide ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Preparation of macroporous carbon material

[0041] 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, heat to evaporate the water, and then cure at 160°C for 2 hours; heat the cured product to 700°C under the protection of a nitrogen atmosphere, and carbonize at a constant temperature for 2 hours; then carbonize at a constant temperature of 900°C for 2 hours; carbonize The product was washed successively with 5 wt% nitric acid and deionized water, and then vacuum-dried at 120° C. for 4 hours to obtain a macroporous carbon material.

Embodiment 2

[0042] Example 2: Preparation of cathode material

[0043] The elemental sulfur and the macroporous carbon obtained in Example 1 were mechanically mixed at a mass ratio of 7:3, placed in a reactor made of 316 stainless steel, and then the reactor was vacuumed and heated to 80°C. After 5 hours of reaction, After the sulfur loading is completed, the reaction product is cooled to 25° C. to obtain the positive electrode material.

Embodiment 3

[0044] Embodiment three: Li + - Preparation of Nafion resin

[0045] Get 20gLiOH and join in 100mlNafion (20wt%, produced in DuPont Company), after stirring for 30 minutes, centrifuge off excess LiOH, obtain Li + - Nafion solution. Li was obtained after vacuum drying + -Nafion resin.

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Abstract

The invention relates to the field of batteries, and aims at providing a high lithium ion conductivity lithium sulphur battery capable of restraining shuttle of polysulfide ions. The lithium sulphur battery is to bond electrode material layer of the cathode to the anode with a lithium nitride layer via a binder to enable the electrode material side of the cathode and the lithium nitride layer of the anode to relatively bind to form an integrated lithium sulphur battery; the binder is a PVP modified Li plus type Nafion resin binder or a nano silicon dioxide doped PVP modified Li plus type Nafion resin binder. The lithium sulphur battery of the invention is high in temperature resistance and excellent in safety, and will not generate migration of the polysulfide ions in a charge-discharge process with excellent cycle life. The high conductivity of a macroporous carbon material could effectively improve the electrical conductivity of a sulfur electrode and has excellent large current charge and discharge performance. The lithium sulphur battery not only could be widely applied to a small electronic device, but also could be applied to a large unsteady state electricity generation plant. The lithium sulphur battery of the invention could be used for adjusting electricity, balancing peak valley electricity of electricity use, improving generating efficiency and reducing the generation cost. The electrode material is low in cost, and the preparation technology is simple and easy to operate.

Description

technical field [0001] The invention relates to the field of batteries, and relates to a diaphragmless lithium-sulfur battery using a modified lithium ion conductive polymer material as a binder and nitriding metal lithium as a negative electrode, in particular to a modification method of a lithium ion conductive polymer material And the binder obtained by doping the modified lithium-ion conductive polymer material with nano-silica and the sulfur electrode prepared by it; metal lithium reacts with high-purity nitrogen to form a fast lithium-ion conductive layer on the surface of metal lithium. Nitriding The negative electrode of lithium, and the lithium-sulfur battery formed by bonding the electrode material layer of the sulfur electrode to the metal lithium with the lithium nitride layer through the binder. Background technique [0002] Lithium-sulfur battery is a kind of lithium-ion battery. Sulfur is used as the positive electrode material of the battery. It has the advan...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/58H01M4/62H01M4/38H01M10/058
CPCH01M4/38H01M4/58H01M4/622H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 李洲鹏李高然刘宾虹
Owner ZHEJIANG UNIV
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