Lithium-sulfur battery
A technology of sulfur battery and lithium salt, applied in the field of lithium-sulfur battery and its manufacturing, can solve the problem of reducing the mass fraction of sulfur, and achieve the effect of increasing accessibility, simple method, and low-cost production
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Embodiment 1
[0133] Preparation of Multiple Composite Materials A, B, 1 and 2
[0134] By combining various carbon blacks ACS, Asbury, Timcal and Ketjenblack with sulfur S 8 Four carbon / sulfur mixtures were prepared by mixing according to the following C / S mass ratio: ACS, Timcal and Ketjenblack carbon black: 21.7 / 78.3; Asbury carbon black: 18.8 / 81.2.
[0135] The four C / S mixtures thus obtained were then ground in a mortar and then stored in four airtight containers.
[0136] Four vessels, each containing a different mixture of ground carbon and sulfur, were heat treated at a temperature of 155°C for 2 hours.
[0137] The heat-treated mixture was then ground in a mortar, resulting in the following four composites:
[0138] -A contains ACS carbon black,
[0139] -B contains Asbury carbon black,
[0140] -1 contains Timcal carbon black, and
[0141] -2 Contains Ketjenblack carbon black.
[0142] Table 1 below shows the properties [specific surface area (m 2 / g), total pore volume (cm ...
Embodiment 2
[0158] Preparation of Multiple Positive Electrodes E-A, E-B, E-1 and E-2
[0159] Each composite material A, B, 1 and 2 obtained in embodiment 1 was respectively mixed with tetraethylene glycol dimethyl ether (TEGDME), emeraldine salt (ES), lithium salt (LiTFSI) and N-methylpyrrolidone ( NMP) at 80°C in a mixer ( Manufactured under the trade name EC) for 30 minutes. The amount of NMP used is at most about 30% by mass of the total mass of the composite of TEGDME, ES and lithium salt.
[0160] The respective slurries thus obtained were then laminated at 95° C. on an aluminum current collector coated with a carbon-based layer.
[0161] Each of the films thus obtained was dried at 105° C. for 30 minutes to obtain a positive electrode in a film form according to the present invention.
[0162] Table 2 below lists the mass compositions of the obtained four positive electrodes.
[0163] Table 2
[0164]
[0165] (*) : Does not constitute the electrode of the present inven...
Embodiment 3
[0167] Manufacture of batteries including positive electrodes E-A, E-B, E-1 and E-2
[0168] a) Preparation of the gelled polymer electrolyte EG according to the present invention
[0169] Part of the lithium salt (LiTFSI) (39% by mass) was dissolved in TEGDME (6% by mass) by magnetic stirring at 50°C. followed by A copolymer of PEO (20% by mass) and PVDF-HFP (35% by mass) was added to the resulting mixture. At 130°C, the resulting mixture was placed in the Blend in an EC mixer for 1 hour. The resulting electrolyte paste was laminated between two silicone-coated PET plastic films at 125 °C.
[0170] b) Battery assembly
[0171] Four batteries B-A, B-B, B-1 and B-2 were prepared respectively by assembling the following materials in anhydrous atmosphere (air with dew point <-40°C) at 5 bar and 80°C:
[0172] -each electrode in the four positive electrodes E-A, E-B, E-1 and E-2 obtained in Example 2,
[0173] - the gelled polymer electrolyte EG prepared in step a) ab...
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