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Preparation method for positive plate of lithium-sulfur battery

A positive pole piece, lithium-sulfur battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as no research reports, and achieve the effect of improving cycle performance, excellent electrical conductivity, and electrode structure stability

Inactive Publication Date: 2012-07-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there is no research report on it in the field of lithium-sulfur batteries

Method used

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  • Preparation method for positive plate of lithium-sulfur battery
  • Preparation method for positive plate of lithium-sulfur battery
  • Preparation method for positive plate of lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Mix elemental sulfur powder, conductive carbon black, and polyacrylic acid (PAA) at a mass ratio of 60:30:10, and disperse them in water of a certain mass (85wt% of the dry mass), and then coat them on an Al foil set. In terms of fluid, after drying, it is compressed to obtain a lithium-sulfur battery positive electrode sheet.

[0033] The battery assembly and testing are as follows: the positive electrode sheet is punched into an electrode sheet with a diameter of 10mm, the metal lithium sheet is used as the negative electrode, and the electrolyte is 1M LiTFSI / DOL:DME (1:1), assembled in a glove box filled with argon into a CR2025 button battery. Carry out constant current charge and discharge test at room temperature (25°C) at 0.2C, and the charge and discharge cut-off voltage is 1.5~3.0V. The specific capacity of the first discharge is 758mAh / g, and the specific capacity after 50 cycles is 313mAh / g. Using polyvinylidene fluoride (PVDF) as the binder, the first disc...

Embodiment 2

[0035] The elemental sulfur powder, conductive carbon black, and lithium polyacrylate (PAALi) were uniformly mixed according to the mass ratio of 60:33:7, and dispersed in a certain mass (90wt% of the dry mass) of water, and then coated on the Al foil set In terms of fluid, after drying, it is compressed to obtain a lithium-sulfur battery positive electrode sheet.

[0036] Cell assembly was the same as for testing and Example 1. After 50 cycles, the discharge specific capacity is 362mAh / g. Compared with polyvinylidene fluoride (PVDF), the impedance of the fresh battery and after 50 cycles is significantly reduced. Impedance spectrum after 50 cycles see figure 2 .

Embodiment 3

[0038] Mix sulfur-carbon nanotube composite material, carbon fiber, and polyacrylic acid (PAA) uniformly according to the mass ratio of 80:10:10, and disperse them in water with a certain mass (85wt% of the dry mass), and then coat them on Al foil On the current collector, dry and press to obtain a lithium-sulfur battery positive electrode sheet.

[0039] Battery assembly and testing are the same as in Example 1. The first discharge specific capacity is 1254mAh / g, and the battery discharge specific capacity remains at 716mAh / g after 40 cycles. image 3 It is the lithium-sulfur battery cycle performance curve obtained in Example 3.

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Abstract

The invention discloses a preparation method for a positive plate of a lithium-sulfur battery. According to the invention, one or more selected from the group consisting of polyacrylic acid and polyacrylate is used as a binder and is uniformly mixed with a sulfur-containing material and a conductive additive, an obtained mixture is dispersed in a solvent, obtained slurry is coated on a current collector, and the current collector undergoes drying and tabletting so as to prepare the positive electrode of the lithium-sulfur battery. Polyacrylic acid and polyacrylate are both water system binders, can be dissolved by using water as a solvent, have a low requirement for environmental humidity, have no toxicity and have good mechanical peeling strength and excellent bonding performance, which enables structural stability of the electrode in a cyclic process to be improved, thereby enhancing cyclic stability of the battery; meanwhile, a glue-shaped structure of polyacrylic acid and polyacrylate can inhibit diffusion of polysulfide into electrolyte, which is favorable for improving cycle performance of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the field of new energy, and relates to a preparation method of a positive pole piece for a lithium-sulfur battery, in particular to an improvement of its binder. Background technique [0002] With the increasing shortage of traditional resources and energy and the increasingly serious environmental problems, the development of new energy storage and conversion technologies has become the focus of energy strategies of various countries. Among them, the lithium-sulfur battery is a high-energy-density secondary battery with great development potential and application prospects, including three main components of the lithium-sulfur battery, the positive electrode, the negative electrode, and the electrolyte. It has high specific capacity (1675mAh / g) and high energy density (2600Wh / kg). In addition, sulfur as an active material also shows incomparable advantages in terms of cost and environmental friendliness. [0003] However, l...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/62
CPCY02E60/122Y02E60/10
Inventor 张治安贾明邓兆丰卢海包维斋曾涛刘晋赖延清李劼刘业翔
Owner CENT SOUTH UNIV
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