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A kind of lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery and a lithium-poor technology, applied in the field of lithium-sulfur batteries and their preparation, can solve the problems of poor battery safety, loss of active material, puncture of separators, etc. Effect

Active Publication Date: 2017-01-25
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of lithium-sulfur battery and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1, different from Comparative Example 1, mainly comprises the following steps:

[0036] Isolation membrane preparation: select a polypropylene isolation membrane with a thickness of 10um, a porosity of 30%, and a pore diameter of 10nm for use;

[0037] Others are the same as those of Comparative Example 1 and will not be repeated here.

Embodiment 2

[0038] Embodiment 2, being different from Comparative Example 1, mainly comprises 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] Embodiment 3, different from Comparative Example 1, mainly comprises the following steps:

[0042] Isolation membrane preparation: select a polypropylene isolation membrane with a thickness of 15um, a porosity of 60%, and a pore diameter 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 in particular relates to a lithium-sulfur battery and a preparation method thereof. A lithium sulfide barrier layer is arranged between the cathode sheet and the anode sheet of the lithium-sulfur battery, and the barrier layer is composed of a porous substrate and a porous barrier layer. Layer composition, the thickness of the substrate is 3um-50um, the porosity is 30%-70%, and the pore size does not exceed 100nm; the porous barrier layer is composed of filler particles and adhesives, the thickness is 0.5um-10um, and the effective pore size of the porous structure r is not more than 200nm, and the particle diameter of filler particles is R≤10r. The existence of the barrier layer can effectively reduce / solve the problem of lithium sulfide diffusion to the anode side and precipitation, so the prepared battery cell has better cycle 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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M2/16H01M10/058H01M50/443H01M50/451H01M50/491
CPCY02E60/10Y02P70/50
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH