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Metal cotton-based lithium sulfur battery anode material and preparation method thereof

A technology for lithium-sulfur batteries and positive electrode materials, which is applied to battery electrodes, lithium batteries, and non-aqueous electrolyte battery electrodes. It can solve the problems of non-conductivity, achieve light weight, ease volume expansion, and good charge-discharge cycle stability.

Inactive Publication Date: 2014-11-19
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the present invention uses metal wool as the positive electrode base material, it solves the problem that elemental sulfur cannot conduct electricity as the positive electrode material of lithium-sulfur batteries and needs to add binders and conductive agents. At the same time, due to the addition of metal wool, the battery charge and discharge cycle stability is improved a big improvement

Method used

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  • Metal cotton-based lithium sulfur battery anode material and preparation method thereof
  • Metal cotton-based lithium sulfur battery anode material and preparation method thereof
  • Metal cotton-based lithium sulfur battery anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of sulfur composite metal wool integrated positive electrode: Cut a 1mm thick metal wool sheet into a disc with a diameter of 13mm, clean it with ultrasonic waves in a 1mol / L HCl solution for 15 minutes, and then use 1mol / L NaHCO 3 Ultrasonic cleaning in the solution for 15 minutes, ultrasonic cleaning in deionized water for 15 minutes, the ultrasonic power is 100W, the cleaned metal wool is dried at 60℃ for 3 hours, and then used; weigh the quality of the cleaned and dried metal wool with an electronic balance M1, weigh 15mg of elemental sulfur, evenly cover the elemental sulfur on the metal wool, place it in a vacuum drying oven, and set the vacuum drying oven parameters to 120°C for 3h to make the elemental sulfur enter the pores of the metal wool. The cathode material for lithium-sulfur battery of sulfur composite metal wool can be obtained. Weigh the mass M2 of the sulfur-added metal wool with an electronic balance again. The difference between the mass a...

Embodiment 2

[0036] The preparation process of the sulfur composite metal wool integrated positive electrode is the same as in Example 1, and the lithium-sulfur battery is assembled in the same manner as in Example 1. The content of elemental sulfur in Example 2 is 1 mg. After the battery is assembled, the battery is left to stand for 24 hours, and the cyclic voltammetry test is performed on this embodiment using the Shanghai Chenhua electrochemical workstation. The test voltage is 1 to 3V and the scanning rate is 0.1mV / S. Corresponds to the attached Image 6 The cyclic voltammetry curve in the graph.

Embodiment 3

[0038] The preparation process of the sulfur composite metal wool integrated positive electrode is the same as in Example 1, and the lithium-sulfur battery is assembled in the same manner as in Example 1. The content of elemental sulfur in Example 3 is 0.45 mg. Use the Newwell battery test system to test the rate stability performance of the assembled battery. The test temperature is room temperature, the charging and discharging voltage is 1-3V relative to Li / Li+, and the charging and discharging ratios are 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, and 0.1C. Corresponds to the attached Figure 7 The magnification performance curve in.

[0039] From figure 1 It can be seen that the metal wool material is a porous material, and its composition is a porous material formed by many stainless steel wires interlaced together. It can be seen from the figure that the pore size of the material is not uniform, and the pore size is about 10~200μm, the porosity is higher, reaching more than 50%.

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Abstract

The invention discloses a metal cotton-based lithium sulfur battery anode material and a preparation method thereof. A sulfur composite metal cotton material is obtained by uniformly covering elemental sulfur by metal cotton to obtain a mixture, heating the mixture in a vacuum drying box and injecting sulfur into holes in the metal cotton. According to the material, the difficulty that the elemental sulfur is not conductive is solved; the elemental sulfur is attached to the metal cotton with high conductivity to well conduct electrons; furthermore, the elemental sulfur is attached to the holes in the metal cotton and is unlikely to fall off; a button battery prepared from the anode material is high in circulating performance. The preparation technology is simple; a requirement on equipment is low; the cost is low, and industrial production is facilitated.

Description

Technical field [0001] The invention relates to a lithium-sulfur battery positive electrode material and a preparation method thereof, in particular to a sulfur composite metal wool material used as a lithium-sulfur battery positive electrode material and a preparation method thereof. Background technique [0002] With the gradual depletion of major natural resources such as coal, oil, and natural gas, the energy crisis has become one of the major issues that mankind must solve in the future. At present, the green and pollution-free new high-energy chemical power source has become a hot spot for the development of various countries in the world. [0003] Lithium-sulfur batteries have very broad application prospects, and scientists have been studying them for more than 20 years. Lithium-sulfur batteries not only provide high-density energy, but are also better in stability, safety and service life. Compared with other materials that can be used in lithium-ion batteries, the cost o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/66
CPCH01M4/364H01M4/38H01M10/052Y02E60/10
Inventor 蒋文娟马增胜章佳勋林建国
Owner XIANGTAN UNIV
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