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Preparation method of organic sulfur positive electrode material of lithium-sulfur battery

A technology for positive electrode materials and lithium-sulfur batteries, applied in electrode manufacturing, battery electrodes, lithium batteries, etc., can solve problems such as long process routes and increased operational difficulty, and achieve the effect of promoting electrical conductivity and improving high-current charging and discharging capabilities

Active Publication Date: 2020-11-27
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method effectively solves the conductivity problem, but the process route is longer, which increases the difficulty of operation

Method used

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  • Preparation method of organic sulfur positive electrode material of lithium-sulfur battery
  • Preparation method of organic sulfur positive electrode material of lithium-sulfur battery
  • Preparation method of organic sulfur positive electrode material of lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This example describes the dicyclopentadiene-sulfur@KI cathode material and its preparation method.

[0038] 1) Take dried 6g of sublimed sulfur and 0.5g of KI in a 50ml three-necked flask, and mechanically stir at 185°C for 5.5min under a nitrogen atmosphere to obtain a mixed liquid containing KI;

[0039] 2) Inject 3.5 g of dicyclopentadiene (DCPD) into the product obtained in step 1) at 185° C. through a syringe to graft linear sulfur onto the carbon chain of dicyclopentadiene, and react for 12 minutes to obtain a dark red viscous mixture;

[0040] 3) The product obtained in step 2) was quickly quenched in liquid nitrogen, and then placed at 155 ° C for 4 hours to solidify, and finally the organic sulfur cathode material S-DCPD@KI with metallic luster was obtained;

[0041] Weigh 0.08g of organic sulfur cathode material S-DCPD@KI, 0.01g of acetylene black, and 0.01g of polyvinylidene fluoride (PVDF) obtained above, put them in a mortar, mix and grind evenly, then add...

Embodiment 2

[0048] This example describes the vinyl norbornene-sulfur @NaI cathode material and its preparation method.

[0049] 1) Take dried 6g of sublimed sulfur and 0.5g of NaI in a 50ml three-necked flask, and mechanically stir at 185°C for 5.5min under a nitrogen atmosphere to obtain a mixed liquid containing NaI;

[0050] 2) Inject 3.5 g of vinyl norbornene (VNB) into the product obtained in step 1) at 185°C through a syringe to graft linear sulfur onto the carbon chain of vinyl norbornene, and react for 20 minutes to obtain a deep red viscous thick mixture;

[0051] 3) The product obtained in step 2) was quickly quenched in liquid nitrogen, and then placed at 155 ° C for 4 hours to solidify, and finally obtained an organosulfur cathode material S-VNB@NaI with a metallic luster;

[0052] Lithium-sulfur battery was assembled according to the same method as in Example 1;

[0053] The electrochemical performance test was carried out on the prepared lithium-sulfur battery, the voltag...

Embodiment 3

[0055] This example describes the styrene-sulfur @AgI cathode material and its preparation method.

[0056] 1) Take dried 6g of sublimed sulfur and 0.5g of AgI in a 50ml three-necked flask, and mechanically stir at 185°C for 5.5min under a nitrogen atmosphere to obtain a mixed liquid containing AgI;

[0057] 2) Inject 3.5 g of styrene (STY) into the product obtained in step 1) at 185° C. through a syringe to graft linear sulfur onto the styrene carbon chain and react for 11 minutes to obtain a dark red viscous mixture;

[0058] 3) The product obtained in step 2) was quickly quenched in liquid nitrogen, and then placed at 155 ° C for 4 hours to solidify, and finally an organosulfur cathode material S-STY@AgI with black metallic luster was obtained;

[0059] Lithium-sulfur battery was assembled according to the same method as in Example 1;

[0060] The electrochemical performance test was carried out on the prepared lithium-sulfur battery. The voltage window was 1.7V-2.8V. Unde...

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Abstract

The invention belongs to the field of battery materials, and relates to a preparation method of an organic sulfur positive electrode material of a lithium-sulfur battery. The method comprises the steps of mixing sublimed sulfur with iodide, and carrying out ring-opening polymerization on the sublimed sulfur in a specific atmosphere at a high temperature to form linear sulfur, and obtaining iodide-containing linear sulfur mixed liquid; then adding an organic material into the iodide-containing mixed liquid to graft linear sulfur onto a carbon chain of the organic material; and finally quenchingand curing to obtain the iodide-containing organic sulfur positive electrode material. The obtained organic sulfur positive electrode material is good in conductivity and rate capability.

Description

technical field [0001] The invention belongs to the field of power material preparation, and relates to the preparation of an organic sulfur cathode material for a lithium-sulfur battery, more specifically, an iodide-containing organic sulfur cathode material. Background technique [0002] The theoretical energy density of lithium-sulfur batteries is as high as 2600Wh kg -1 , the theoretical specific capacity can reach 1675mAh g -1 , is 5-6 times that of conventional lithium-ion batteries, and sulfur is abundant in nature, so it is considered to be a strong candidate for power batteries. [0003] Elemental sulfur S 8 It is ring-shaped, and its charging and discharging intermediate products are easily dissolved in the electrolyte, causing a shuttle effect. In the prior art, there is a heating method to open the ring of S8, and graft S8 with a polymer to fix sulfur, thereby inhibiting sulfur polymerization. shuttle effect. For example, in "201811238888.7 A Copolymerized Su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M4/62H01M4/04H01M10/052
CPCH01M4/60H01M4/624H01M4/04H01M10/052Y02E60/10
Inventor 何志鹏郭秀美张静静康海张汉平
Owner CHANGZHOU UNIV
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