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Lithium-sulfur primary battery cathode material and preparation method thereof

A battery positive electrode and positive electrode material technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low sulfur active material utilization, low active material load, open circuit voltage drop, etc., to promote the transmission of ions and electrons , easy strategy, enhanced stability effect

Active Publication Date: 2019-06-28
SYNERGY INNOVATION INST OF GDUT HEYUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte has a certain solubility for elemental sulfur and polysulfides. Although this characteristic is beneficial to the electrochemical reaction of the sulfur cathode, during the long-term storage of lithium-sulfur batteries, the elemental sulfur slightly soluble in the electrolyte It will pass through the separator to reach the negative electrode side, and form a layer of solid electrolyte interface film with lithium sulfide as the main component on the surface of metal lithium. Lithium sulfide in this interface film will react with elemental sulfur to form polysulfide soluble in the electrolyte. Lithium, thus exposing the surface of fresh lithium to continue to react with elemental sulfur or polysulfide in the solution, while the elemental sulfur on the positive side continues to dissolve, resulting in continuous loss of battery capacity and a rapid drop in open circuit voltage
The existing lithium-sulfur primary battery cathode materials have the problems of low active material loading and low utilization rate of sulfur active material

Method used

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  • Lithium-sulfur primary battery cathode material and preparation method thereof
  • Lithium-sulfur primary battery cathode material and preparation method thereof

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Effect test

Embodiment 1

[0026] The positive electrode material of the lithium-sulfur primary battery is α-Fe 2 o 3 / SnO 2 Composite materials formed by nanomaterials and S. said

[0027] α-Fe 2 o 3 / SnO 2 Nanomaterials are composite heterostructures.

[0028] According to the mass ratio of α-Fe2 o 3 / SnO 2 Nanomaterials: S is 1:3.

[0029] The composite material is prepared by combining the chemical vapor deposition method and the hydrothermal method.

[0030] The preparation method of the positive electrode material of the lithium-sulfur primary battery comprises the following steps:

[0031] (1) SnO 2 Preparation of nanowires: mix SnO with a mass ratio of 1:1 2 The powder and graphite powder were ground and mixed and transferred to a porcelain boat, and then the stainless steel substrate and the porcelain boat coated with Au sputtering were placed in a quartz tube, wherein the center of the porcelain boat was located in the center of the quartz tube, and the stainless steel substrate su...

Embodiment 2

[0037] The preparation method of the positive electrode material of the lithium-sulfur primary battery comprises the following steps:

[0038] (1) SnO 2 Preparation of nanowires: mix SnO with a mass ratio of 1:1 2 The powder and graphite powder were ground and mixed and transferred to a porcelain boat, and then the stainless steel substrate and the porcelain boat coated with Au sputtering were placed in a quartz tube, wherein the center of the porcelain boat was located in the center of the quartz tube, and the stainless steel substrate substrate Placed downstream of the argon flow; the furnace temperature was raised to 1050 °C at a rate of 50 °C / min, and heated at 1050 °C for 1 h under constant conditions of 50 sccm argon flow and 15 mbar pressure; after cooling to room temperature, SnO 2 nanowires were deposited on stainless steel substrates to obtain deposited SnO 2 Nanowires;

[0039] (2) α-Fe 2 o 3 / SnO 2 Preparation of nanomaterials: the prepared SnO 2 The stainle...

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Abstract

The invention relates to a lithium-sulfur primary battery cathode material and a preparation method thereof, and belongs to the technical field of lithium-sulfur batteries. The cathode material is analpha-Fe2O3 / SnO2 nano-material and S combined composite material. The cathode material is applied to a lithium-sulfur primary battery, so that the battery has high discharging capacity and circulationstability; and the alpha-Fe2O3 / SnO2 nano-material and S combined composite material of a composite heterostructure is prepared by a chemical vapor deposition and hydrothermal combined method, the production capacity is high, the industrial feasibility is high, and the method is easy to realize low cost large-scale industrial preparation.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur primary battery cathode material and a preparation method thereof. Background technique [0002] Today, as human society enters into informatization, mobile phones, notebook computers, and personal portable terminals are becoming more and more popular, and are rapidly developing in the direction of light weight and miniaturization, which puts forward higher requirements for the energy density of batteries. In addition, with the advent of a large number of other industrial, civil, medical, and military electronic products, especially the development of space technology and new defense equipment such as new satellites, spacecraft, high-power laser weapons, and digital soldier systems, the requirements for light weight and volume The demand for small, high specific energy, high specific power, safe, reliable, and pollution-free primary b...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/48H01M4/485H01M4/525
CPCY02E60/10
Inventor 黄国宏张永光
Owner SYNERGY INNOVATION INST OF GDUT HEYUAN
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