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Lithium-sulfur battery positive electrode, preparation method and applications thereof

A lithium-sulfur battery and positive electrode technology, which is applied in the field of lithium-sulfur batteries, can solve problems such as poor performance and poor rate performance, and achieve the effects of improving conductivity, simple and controllable preparation process, and improving overall performance

Active Publication Date: 2016-10-19
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the electrode materials of existing lithium-sulfur batteries have a sulfur loading capacity lower than 4mg / cm 2 It has better performance when the sulfur load is greater than 4mg / cm 2 , even greater than 100mg / cm 2 When , the performance will become very poor, and the rate performance is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 800mg of sulfur, 100mg of nitrogen-doped graphene and 100mg of carbon black were reacted in a sealed reactor at 150°C for 12 hours to form the positive electrode material. Take 900mg of the above positive electrode material, add 50mg of acetylene black conductive agent and 50mg of PVDF binder, add the solvent NMP, stir to form a slurry, and apply it on the nickel foam that has been reduced by hydrogen at 750°C for 30 minutes, so that the slurry is evenly distributed in the nickel foam. Dry at 50°C, dry in vacuum at 50°C for 24 hours, and die-cut pole pieces. Soak the pole pieces in the electrolyte for 24 hours to assemble the battery. Negative pole lithium sheet, 1M bistrifluoromethanesulfonyl imide lithium 1,3-dioxane / ethylene glycol dimethyl ether (volume ratio 1:1) containing 1wt% lithium nitrate and Li 2 Sx(1M) is the electrolyte, which is assembled into button, soft pack and cylindrical battery respectively. Electrochemical tests are carried out, the charge and d...

Embodiment 2

[0040]500mg of sulfur, 100mg of nitrogen-doped graphene and 400mg of multi-walled carbon nanotubes were reacted in a sealed reactor at 300°C for 12 hours to form the positive electrode material. Take 900mg of the above-mentioned positive electrode material, add 50mg of graphene conductive agent and 50mg of PVA binder, add solvent water, stir to form a slurry, and apply it on the nickel foam reduced by hydrogen at 750°C for 30 minutes, so that the slurry is evenly distributed in the nickel foam. Dry at 90°C, dry in vacuum at 100°C for 12 hours, and die-cut pole pieces. Soak the pole pieces in the electrolyte for 12 hours to assemble the battery. Negative pole lithium sheet, 1M bistrifluoromethanesulfonyl imide lithium 1,3-dioxane / ethylene glycol dimethyl ether (volume ratio 1:1) containing 1wt% lithium nitrate and Li 2 Sx(1M) is the electrolyte, which is assembled into button, soft pack and cylindrical battery respectively. Electrochemical tests are carried out, the charge an...

Embodiment 3

[0042] 800mg of sulfur, 100mg of nitrogen-doped graphene and 100mg of carbon black were reacted in a sealed reactor at 250°C for 12 hours to form the positive electrode material. Take 900mg of the above-mentioned positive electrode material, add 50mg of acetylene black conductive agent and 50mg of LA132 binder, add solvent water, stir to form a slurry, and apply it on the nickel foam reduced by hydrogen at 750°C for 60 minutes, so that the slurry is evenly distributed in the nickel foam. Dry at 90°C, dry in vacuum at 100°C for 12 hours, and die-cut pole pieces. Soak the pole pieces in the electrolyte for 2 hours and assemble the battery. The negative electrode is a lithium sheet, and 1M bistrifluoromethanesulfonimide lithium 1,3-dioxane / ethylene glycol dimethyl ether (volume ratio 1:1) is used as the electrolyte, which are respectively assembled into buttons, soft pack and cylindrical batteries. Electrochemical tests are carried out, the charge and discharge voltage range is...

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Abstract

The invention discloses a lithium-sulfur battery positive electrode, which comprises: a porous metal material adopted as the skeleton and the main electric conduction network; a positive electrode material filled in the skeleton, wherein the positive electrode material comprises sulfur, nitrogen-doped graphene, and a carbon material; and a secondary electric conduction network mainly formed by an electric conduction agent doped inside the positive electrode material. The invention further discloses a preparation method and applications of the lithium-sulfur battery positive electrode. According to the present invention, the foamed nickel is adopted as the positive electrode skeleton of the lithium-sulfur battery positive electrode, and the nitrogen-doped graphene is introduced, such that the electric conductivity and the sulfur loading amount of the positive electrode can be effectively improved so as to effectively optimize the battery performance. In addition, the lithium-sulfur battery positive electrode process is simple and controllable, and the large-scale production is easily achieved.

Description

technical field [0001] The invention relates to a lithium-sulfur battery, in particular to a lithium-sulfur battery positive electrode, a preparation method and application thereof. Background technique [0002] With the development of science and technology and the continuous improvement of people's living standards, people's demand for resources is also getting higher and higher. At the end of 2012, the data released by the National Bureau of Statistics showed that the per capita energy consumption was 293.8kg standard coal, and the per capita electricity consumption was 460.4KWh, of which electricity consumption accounted for 80% of the total energy consumption. [0003] The lithium-sulfur battery uses metal lithium as the negative electrode and elemental sulfur as the positive electrode, and its theoretical energy density is as high as 2600Whkg -1 , which is more than 5 times that of traditional lithium-ion batteries. At the same time, sulfur, which is used as the posit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/62H01M4/38H01M4/133H01M4/13H01M4/1393H01M4/139
CPCY02E60/10
Inventor 张跃钢丘勇才侯远刘美男周莉莎李宛飞
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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