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Lithium-sulfur battery with stannous sulfide as anchor center and preparation method of positive electrode thereof

A stannous sulfide and lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, batteries, etc., can solve the problems of capacity loss, lithium-sulfur battery capacity decline, poor cycle life, etc., to improve speed capacity, good electrode reaction reversible The effect of stability and low internal resistance

Inactive Publication Date: 2016-08-24
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

Method used

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  • Lithium-sulfur battery with stannous sulfide as anchor center and preparation method of positive electrode thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Preparation of macroporous carbon material supported by nano-stannous sulfide

[0032] Weigh commercially available hydrophilic nano-CaCO with a particle size of 15-40 nm according to the mass ratio of 1:1:0.1 3 (10g), glucose (10g) and stannous chloride (1g), added to 100mL deionized water, ultrasonic vibration (ultrasonic frequency 40kHz) mixed for 30 minutes to dissolve glucose and stannous chloride and mix with nano-CaCO 3 Disperse evenly; heat to evaporate water, and then solidify at 160°C for 6 hours; heat the cured product to 700°C under the protection of a nitrogen atmosphere, and carbonize at a constant temperature for 2 hours; cool to 500°C, pass in hydrogen sulfide gas, and react for 1 hour. The product was washed and filtered successively with 1 wt% hydrochloric acid and deionized water, and then dried at a constant temperature at 120° C. for 4 hours to obtain a macroporous carbon material containing diffusely distributed nano-stannous sulfide on ...

Embodiment 2

[0033] Example 2: Carrying sulfur in macroporous carbon

[0034] Weigh commercially available hydrophilic nano-CaCO with a particle size of 15-40 nm according to the mass ratio of 1:1:0.3 3 (10g), sucrose (10g) and stannous nitrate (3g), added to 100mL deionized water, ultrasonic vibration (ultrasonic frequency 40kHz) mixed for 30 minutes to dissolve sucrose and stannous nitrate and mix with nano-CaCO 3 Disperse evenly; heat to evaporate the water, and then solidify at 160°C for 6 hours; heat the cured product to 850°C under the protection of nitrogen atmosphere, and carbonize at constant temperature for 2 hours; cool to 500°C, pass in hydrogen sulfide gas, and react for 1 hour. The product was washed and filtered successively with 1 wt% hydrochloric acid and deionized water, and then dried at a constant temperature at 120° C. for 4 hours to obtain a macroporous carbon material containing diffusely distributed nano-stannous sulfide on the inner wall.

[0035] Grind and mix el...

Embodiment 3

[0036] Embodiment three: stannous sulfide coating

[0037] Weigh commercially available hydrophilic nano-CaCO with a particle size of 15-40 nm according to the mass ratio of 1:1:0.5 3 (10g), starch (10g) and stannous sulfate (5g), added to 100mL deionized water, ultrasonic vibration mixing (ultrasonic frequency 40kHz) for 30 minutes to dissolve starch and stannous sulfate and mix with nano-CaCO 3 Disperse evenly; heat to evaporate the water, and then solidify at 160°C for 6 hours; heat the cured product to 900°C under the protection of nitrogen atmosphere, and carbonize at constant temperature for 2 hours; cool to 500°C, pass in hydrogen sulfide gas, and react for 1 hour. The product was washed and filtered successively with 1 wt% hydrochloric acid and deionized water, and then dried at a constant temperature at 120° C. for 4 hours to obtain a macroporous carbon material containing diffusely distributed nano-stannous sulfide on the inner wall.

[0038] Grind and mix elemental...

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Abstract

The invention relates to the field of a lithium sulfur battery, and aims at providing a lithium sulfur battery adopting stannous sulfide as an anchoring center and a preparation method of a positive electrode of the lithium sulfur battery. The preparation method of the lithium sulfur battery adopting the stannous sulfide as the anchoring center specifically comprises the following steps: preparing a macroporous carbon material with nano stannous sulfide being dispersed on the inner wall and a macroporous carbon material with supported sulfur, preparing an anode material of the lithium sulfur battery by utilizing the macroporous carbon material with supported sulfur, preparing the positive electrode by utilizing the positive electrode material, and assembling the positive electrode, a diaphragm, a negative electrode and electrolyte to form the lithium sulfur battery. The prepared high-capacity lithium ion battery positive electrode material is good in conductivity, low in internal resistance, good in electrode reaction reversibility, good in chemical stability and thermal stability, low in price, easy to prepare and pollution-free, so that the electrochemical dynamics performance of the lithium sulfur battery positive electrode can be improved, the electrode polarization can be alleviated, and the speed capacity of the lithium battery can be improved.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to a lithium-sulfur battery with stannous sulfide as an anchor center and a preparation method for a positive electrode thereof. Background technique [0002] Lithium-sulfur battery is a kind of lithium-ion battery. A lithium-ion battery that uses sulfur as the positive electrode of the battery has the advantages of light weight, large capacity, and no memory effect. The specific capacity of lithium-sulfur battery is as high as 1675mAh g -1 , much higher than the commercially widely used lithium cobalt oxide battery capacity (<150mAh g -1 ), and sulfur is an environmentally friendly element that basically has no pollution to the environment. Lithium-sulfur batteries are a very promising lithium-ion battery. [0003] Take the lithium-sulfur battery with lithium as the negative electrode as an example. During discharge, the negative electrode reaction is that lithium lose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/1397H01M10/052
CPCH01M4/5815H01M4/663H01M10/052H01M2220/20Y02E60/10
Inventor 刘宾虹李洲鹏
Owner ZHEJIANG UNIV
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