Lithium-sulfur battery electrode and preparation method of lithium-sulfur battery containing the same

A lithium-sulfur battery and electrode technology, which is applied in the manufacture of battery electrodes, non-aqueous electrolyte battery electrodes, and electrolyte batteries, can solve the problems of lithium sulfide dissolution and diffusion, active material loss, and poor battery safety, and achieve industrialization in large quantities Production, blocking sulfide diffusion, high capacity effect

Inactive Publication Date: 2015-10-21
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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
[0006] Aiming at the dissolution of lithium sulfide formed in the positive electrode of lithium-sulfur battery during charging and discharging, it is indeed necessary to develop a new lithium-sulfur battery electrode to solve the problem of dissolution and diffusion of lithium sulfide formed after the positive electrode of lithium-sulfur battery is discharged.

Method used

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  • Lithium-sulfur battery electrode and preparation method of lithium-sulfur battery containing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of the positive electrode sheet of the first coating layer: the sulfur-activated carbon composite (the loading capacity of sulfur is 90%), the binder, the conductive agent (the mass ratio of the above three substances is 94:3:3) and the solvent, The slurry 1 was obtained after thorough stirring, and then coated on an aluminum foil, and after cold pressing, a positive electrode sheet with a coating thickness of 30 μm on one side was obtained for use.

[0031] Preparation of the positive electrode sheet of the two-layer coating structure: the sulfur-activated carbon composite (the loading of sulfur is 75%), the binder, the conductive agent (the mass ratio of the above three substances is 94:3:3) and the solvent , after fully stirring, slurry 2 is obtained, and then coated on the surface of the above-mentioned first layer of coating layer, and after cold pressing, the second layer of coating layer thickness is obtained after cold pressing. - the particle size o...

Embodiment 2

[0034] Preparation of the positive electrode sheet of the first coating layer: fully stir the nano-sulfur particles, graphene, binder (99.5:0.3:0.2) and solvent to obtain a slurry, and then coat it on the aluminum foil, after cold pressing A positive electrode sheet with a coating thickness of 20 μm on one side was obtained for use.

[0035] Preparation of the positive electrode sheet of the two-layer coating structure: the sulfur-graphene composite (the loading of sulfur is 95%) and the binder, the conductive agent (the mass ratio of the above three substances is 94:3:3) and the solvent , after fully stirring to obtain slurry 2, and then coating on the surface of the first coating layer, and cold pressing to obtain a two-layer positive electrode sheet with a thickness of the second coating layer of 20 μm for use.

[0036]The preparation of the positive plate of the three-layer coating structure: the sulfur-graphene composite (the loading capacity of sulfur is 60%) and the bin...

Embodiment 3

[0040] Preparation of the positive electrode sheet of the first coating layer: the sulfur-ketjen black compound (the loading capacity of sulfur is 90%), the adhesive, the conductive agent (the mass ratio of the above three substances is 94:3:3) and the solvent , the slurry 1 was obtained after fully stirring, and then coated on an aluminum foil, and after cold pressing, a positive electrode sheet with a single-side coating thickness of 400 μm was obtained for use;

[0041] Preparation of positive electrode sheet with two-layer coating structure: Nano-lithium iron phosphate, sulfur-conductive carbon composite (the loading of sulfur is 50%), binder, conductive agent (the mass ratio of the above four substances is 50:44 :2:4) and solvent, fully stirred to obtain slurry 2, then coated on the surface of the first layer of coating layer, after cold pressing to obtain a second layer of coating layer thickness of 2 μm of the two-layer positive electrode sheet for use .

[0042] Prepa...

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Abstract

The invention belongs to the field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery electrode. The lithium-sulfur battery electrode is composed of a current collector and a coating layer. The coating layer has an n-layer structure, i.e. a first layer, a second layer...an n-th layer respectively from the current collector side to the coating layer surface, and n is an integer greater than or equal to 2. The sulfur content of each coating layer is a1%, a2%...an% respectively, and a1 is greater than or equal to a2, a2 is greater than or equal to...greater than or equal to an. The sulfur content is lower when the distance to the electrode surface layer is shorter, after lithium intercalation, the formed lithium sulfide content is correspondingly lower, and the fixation effect of the non-sulfur component substance on the sulfide is stronger. Thus, the difficulty for the lithium sulfide to move to the cathode side is larger, thus solving the problems that the lithium sulfide dissolves in the electrolyte solution and diffuses to the cathode side.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery electrode, a lithium-sulfur battery containing the electrode 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 centur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/058
CPCH01M4/13H01M4/139H01M10/058Y02E60/10Y02P70/50
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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