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A lithium-sulfur battery with high lithium-ion conductivity and inhibited polysulfide ion shuttling

A lithium-sulfur battery, ion conduction technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of unable to prevent polysulfide ion shuttle, lithium-sulfur battery capacity decline, sulfur electrode capacity decline, etc. Effects of lithium ion conduction and inhibition of polysulfide ion shuttle enhancement, inhibition of capacity fading, and improvement of speed capacity and performance stability

Inactive Publication Date: 2017-10-27
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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  • A lithium-sulfur battery with high lithium-ion conductivity and inhibited polysulfide ion shuttling
  • A lithium-sulfur battery with high lithium-ion conductivity and inhibited polysulfide ion shuttling

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 20g LiOH and join in 100ml Nafion (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 to provide a lithium-sulfur battery with high lithium ion conduction that suppresses the shuttling of polysulfide ions. The lithium-sulfur battery uses a binder to bond the electrode material layer of the positive electrode to the negative electrode with a lithium nitride layer, so that the electrode material side of the positive electrode and the lithium nitride layer of the negative electrode are relatively bonded to form an integrated lithium-sulfur battery. ; The binder is a PVP modified Li+ type Nafion resin binder or a nano-silica doped PVP modified Li+ type Nafion resin binder. The invention has high temperature resistance and good safety. The migration of polysulfide ions does not occur during charging and discharging, and it has excellent cycle life. The high conductivity of the macroporous carbon material effectively improves the conductivity of the sulfur electrode and has good high-current charge and discharge performance. It can be widely used not only in small electronic devices, but also in large-scale non-steady-state power plants to regulate power, balance peak and valley power consumption, improve power generation efficiency, and reduce power generation costs. The cost of the electrode material is low, and the preparation process is simple and easy.

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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Patent Type & Authority Patents(China)
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