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Lithium-sulfur battery mixed positive electrode and preparation method thereof
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A hybrid positive electrode and lithium-sulfur battery technology, applied in electrode manufacturing, battery electrodes, lithium batteries, etc., can solve the problems of poor battery cycle stability, high activation voltage for the first charge, and lower activation voltage for the first charge
Inactive Publication Date: 2021-07-06
JILIN NORMAL UNIV
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[0004] The purpose of the present invention is to provide a preparation method of a lithium-sulfur battery mixed positive electrode, the purpose of which is to reduce the initial charge activation voltage, improve the cycle stability of the lithium-sulfur battery, and solve the problems caused by the volume expansion of the positive electrode of the lithium-sulfur battery and the excessively high initial charge activation voltage. The problem of poor cycle stability
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[0038] The preparation steps of the lithium-sulfur battery hybridcathode are as follows:
[0039] 1. Preparation of carbon-coated lithium sulfide electrode sheet:
[0040] (a) Using black carbon-coated lithium sulfidepowder as the active material, 80 mg of the ground lithium sulfide powder coated with black carbon, 10 mg of carbon powder, and 10 mg of binder were placed in a glove box (water oxygen content <1ppm) Weigh and mix, grind evenly;
[0041] (b) dropping the uniformly ground material into a few drops of N-methylpyrrolidone (NMP) solution, and grinding while dropping, so as to perform homogenization;
[0055] The preparation steps of the lithium-sulfur battery hybridcathode are as follows:
[0056] 1. Preparation of carbon-coated lithium sulfide electrode sheet:
[0057] (a) Using black carbon-coated lithium sulfide powder as the active material, 80 mg of the ground lithium sulfide powder coated with black carbon, 10 mg of carbon powder, and 10 mg of binder were placed in a glove box (water oxygen content <1ppm) Weigh and mix, grind evenly;
[0058] (b) dropping the uniformly ground material into N-methylpyrrolidone (NMP) solution, and grinding while dropping, so as to homogenize;
[0060] (d) placing the coated electrode sheet on a heating table at 40-80° C. for drying to obtain a carbon-coated lithium sulfide electrode sheet.
[0061] 2. Preparation of lithium iron phosphate separator:
[0062] (a) get 0.8g lithium iron phosphate, 0.3g binder and 0.9g carbon powder a...
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Abstract
According to the preparation method of the mixed positive electrode of the lithium-sulfur battery, a positive electrode material of the lithium-sulfur battery comprises carbon-coated lithiumsulfide and lithium iron phosphate, the lithium sulfide is considered as a potential candidate of the positive electrode material of the lithium-sulfur battery due to relatively high theoretical capacity and stability in dry air, and in addition, since the density of lithium sulfide is less than the density of elemental sulfur, volume expansion during charging / discharging can be avoided and the structural stability of the positive electrode can be maintained. The polar lithium iron phosphate can provide a good conductive substrate, on one hand, the electrochemical potential of the lithium iron phosphate is about 3.4 V (vs.Li+ / Li), and the lithium iron phosphate is expected to be used as a redox couple for activating lithium sulfide; on the other hand, the adsorbent shows excellent adsorption capacity on polysulfide. The preparation method is simple in preparation process, low in cost, simple in synthesis condition, short in preparation period, easy to operate, environment-friendly and easy for industrial production.
Description
technical field [0001] The invention relates to a lithium-sulfur battery mixed positive electrode and a preparation method thereof, and belongs to the technical field of lithium-sulfur batteries. Background technique [0002] With the development of society, people's demand for energy is increasing day by day. Traditional fossil energy resources such as oil, coal and natural gas are increasingly scarce. At the same time, the consumption of these non-renewable energy sources has brought serious environmental pollution. The development and utilization of renewable and clean energy such as solar energy, wind energy and tidal energy has become imminent. Therefore, environmentally friendly and low-cost lithium-sulfur batteries have received close attention and are considered as a new generation of electrochemical energy storage systems. [0003] Lithium-sulfur batteries have the advantages of low cost and high energy density compared to conventional lithium-ion batteries. Howe...
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