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A kind of slurry preparation method of metal element-containing lithium-sulfur battery cathode material

A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of high time cost, low load capacity, affecting capacity performance, etc., to reduce the loss of active material sulfur, Effect of improving cycle stability and suppressing volume change

Active Publication Date: 2022-05-06
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, the active substance sulfur in the positive electrode material of lithium-sulfur batteries containing metal elements has the following disadvantages: it is easy to expand and damage the battery during charging and discharging; The baking temperature of the chip is 85~150℃, and the time is about 8h. During the baking process, the loss of active material sulfur is easy to be caused, which affects the capacity performance.
It can be seen from the summary diagram and the examples that this layer of protective layer is located on the surface of the pole piece. It is difficult for the solvent to evaporate completely during the subsequent baking process of the pole piece. The time cost is too high and it is difficult to apply it to industrial production.

Method used

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  • A kind of slurry preparation method of metal element-containing lithium-sulfur battery cathode material
  • A kind of slurry preparation method of metal element-containing lithium-sulfur battery cathode material
  • A kind of slurry preparation method of metal element-containing lithium-sulfur battery cathode material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a slurry of a lithium-sulfur battery positive electrode material containing metal elements, comprising the following steps:

[0029] (1) Add 95.5% sulfur / vanadium nitride composite material and 2% superconducting carbon black into the mixer according to the powder ratio and stir evenly, the stirring speed is 28rpm, and the stirring time is 60min, so that the superconducting carbon black is uniform Coated on the surface of the sulfur / metal nitride composite to form a core-shell structure;

[0030] (2) Continue to add 2% PVDF and 0.5% HPMA to the mixer, the stirring speed is 28rpm, and the stirring time is 60min;

[0031] (3) Pour the mixed powder obtained in step (2) into a blender, then add a certain amount of N-methylpyrrolidone to continue stirring, the revolution rate is 30rpm, the autorotation rate is 2800rpm, and the stirring time is 180min. Finally, the solid content is 72% positive electrode slurry.

Embodiment 2

[0033] A method for preparing a slurry of a lithium-sulfur battery positive electrode material containing metal elements, comprising the following steps:

[0034] (1) According to the powder ratio, add 90% iron sulfide and 5% superconducting carbon black into the mixer and stir evenly. The stirring speed is 31rpm and the stirring time is 90min, so that the superconducting carbon black is evenly coated on the metal sulfide A core-shell structure is formed on the surface of the object;

[0035] (2) Continue to add 3% acrylate and 2% polyethylene glycol 200 into the mixer to continue stirring, the stirring rate is 25rpm, and the stirring time is 75min;

[0036] (3) Pour the mixed powder obtained in step (2) into a blender, then add a certain amount of propanol and continue to stir, the revolution rate is 25rpm, the autorotation rate is 3200rpm, and the stirring time is 200min, and finally a positive electrode with a solid content of 65% is obtained slurry.

Embodiment 3

[0038] A method for preparing a slurry of a lithium-sulfur battery positive electrode material containing metal elements, comprising the following steps:

[0039] (1) According to the powder ratio, add 80% sulfur / titanium dioxide composite material and 10% superconducting carbon black into the mixer and stir evenly, the stirring speed is 25rpm, and the stirring time is 40min, so that the superconducting carbon black is evenly coated Formation of a core-shell structure on the sulfur / metal organic polymer surface;

[0040] (2) Continue to add proportioning 4% SBR and 6% CMC to the mixer to continue stirring, the stirring rate is 34rpm, and the stirring time is 55min;

[0041] (3) Pour the mixed powder obtained in step (2) into the blender, then add a certain amount of deionized water to continue stirring, the revolution rate is 36rpm, the autorotation rate is 4100rpm, the stirring time is 150min, and finally the solid content is 50%. positive electrode slurry.

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Abstract

The present invention relates to a kind of slurry preparation method of lithium-sulfur battery cathode material containing metal element, the present invention fully utilizes the superconducting carbon black specific surface area (> 800m 2 g ‑1 ) is greater than that of lithium-sulfur battery cathode materials containing metal elements (100-800m 2 g ‑1 ), surface energy (30~100mJ m ‑2 ) is less than that of lithium-sulfur battery cathode materials containing metal elements (>500mJ m ‑2 ) feature, superconducting carbon black is uniformly coated on the surface of the positive electrode material during the slurry mixing process to form a core-shell structure, which can effectively inhibit the volume change of sulfur during charge and discharge, and improve the cycle stability of the battery. In addition, carbon black only acts as a conductive agent in the traditional slurry mixing process. In addition to the role of conductive agent, the superconducting carbon black used in the present invention can also prevent the sublimation of sulfur and reduce the activity during the subsequent pole piece baking process. The loss of material sulfur improves the capacity performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of slurry preparation for lithium-sulfur batteries, and in particular relates to a method for preparing slurry for positive electrode materials of lithium-sulfur batteries containing metal elements. Background technique [0002] Lithium-sulfur batteries have quickly become one of the next generation energy storage products with great application prospects because of their theoretical specific capacity and specific energy as high as 1675mAh / g and 2600Wh / kg respectively. Among them, lithium-sulfur battery cathode materials containing metal elements are currently a hot spot in the research of lithium-sulfur batteries. The reasons are: strong electrical conductivity; binding polysulfides through physical / chemical interactions; Shuttle effect in lithium-sulfur batteries. However, in practical applications, the active substance sulfur in the positive electrode material of lithium-sulfur batteries containing metal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/052
CPCH01M4/366H01M4/625H01M4/621H01M10/052Y02E60/10
Inventor 朱甜冯凯屈亮辉冯辉灿李孟怀管胜男
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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