Lithium-sulfur battery and preparation method thereof
A lithium-sulfur battery, lithium-poor technology, applied in the field of lithium-sulfur battery and its preparation, can solve the problems of piercing the separator, poor battery safety, loss of active material, etc., and achieve dense pores, small pores, and best comprehensive effect Effect
Active Publication Date: 2015-05-27
GUANGDONG ZHUGUANG NEW ENERGY TECH
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Problems solved by technology
However, during the charging and discharging process, the elemental sulfur will be converted into polysulfides, and the polysulfides will be dissolved in the liquid organic electrolyte, resulting in the loss of active materials during the cycle, and more seriously, the dissolved sulfides will be Dendrites are precipitated on the negative electrode, which has a great risk of piercing the separator, resulting in extremely poor safety of the battery
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0035] Example 1, Different from Comparative Example 1, it mainly includes the following steps:
[0036] Isolation membrane preparation: select a polypropylene isolation membrane with a thickness of 10um, a porosity of 30%, and a pore size of 10nm for use;
[0037] Others are the same as those of Comparative Example 1, and will not be repeated here.
Embodiment 2
[0038] Example 2, Different from Comparative Example 1, it mainly includes the following steps:
[0039] Isolation membrane preparation: select a polypropylene isolation membrane with a thickness of 12um, a porosity of 45%, and a pore size of 15nm for use;
[0040] Others are the same as those of Comparative Example 1, and will not be repeated here.
Embodiment 3
[0041] Example 3, Different from Comparative Example 1, it mainly includes the following steps:
[0042] Isolation membrane preparation: select a polypropylene isolation membrane with a thickness of 15um, a porosity of 60%, and a pore size of 30nm for use;
[0043] Others are the same as those of Comparative Example 1, and will not be repeated here.
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Abstract
The invention belongs to the field of lithium-sulfur batteries and particularly relates to a lithium-sulfur battery and a preparation method thereof. A lithium sulfide barrier layer is arranged between a cathode piece and an anode piece of the lithium-sulfur battery, the barrier layer comprises a porous substrate and a porous barrier layer, the thickness of the substrate is 3 mu m-50 mu m, the porosity is 30%-70%, and the aperture does not exceed 100nm; the porous barrier layer comprises filler particles and an adhesive, the thickness is 0.5 mu m-10 mu m, the effective aperture r of the porous structure does not exceed 200nm, and the particle size R of the filler particles is not more than 10r. Due to the existence of the barrier layer, the problem that a lithium sulfide is diffused to one side of an anode and separated out can be effectively reduced / solved, and a prepared electric core has better cycling performance.
Description
technical field [0001] The invention belongs to the field of lithium-sulfur batteries, in particular to a lithium-sulfur battery and a preparation method thereof. Background technique [0002] Since 1991, carbon materials were creatively used in the field of lithium-ion batteries and brought about revolutionary changes in this field, that is, after multiple charging and discharging efficiently and safely, they have been widely used in mobile phones, cameras, and notebooks. computers and other portable appliances. Compared with traditional lead-acid, Ni-Cd, MH-Ni batteries, lithium-ion batteries have higher specific volume energy density, specific gravimetric energy density, better environmental friendliness, smaller self-discharge and longer battery life. It is an ideal power supply for mobile appliances, power supplies for electric vehicles, and storage appliances for power stations in the 21st century. [0003] However, with the improvement of life taste, people put forw...
Claims
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IPC IPC(8): H01M10/052H01M2/16H01M10/058H01M50/443H01M50/451H01M50/491
CPCY02E60/10Y02P70/50
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH