Preparation method of positive material for lithium-sulfur battery

A sulfur cathode material and cathode material technology, applied in the field of electrochemical cells, can solve problems such as environmental pollution, and achieve the effects of high conductivity, high yield and good cycle performance

Active Publication Date: 2012-12-19
SHANGHAI INST OF SPACE POWER SOURCES
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AI Technical Summary

Benefits of technology

This patented technology allows for efficient production of sulfide composites that have both superior electrical properties and better stability compared to existing methods such as chemical vapor deposition or electrospinning techniques used currently. Additionally, this new technique offers precise particle sizes and consistently produces uniformly sizable sulphur/charcoal composite powders without losing any valuable starting ingredients like graphite flakes.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to make better use of lithium carbon (LiC) chemistry due to its lower cost compared to other types of rechargeable batteries such as nickel metal hydride/lithium cells. Additionally, current research on modifying sulfite cathodics focuses only towards increasing electron conduction rather than reducing polarity and prevention of degradations caused by polysufims formed from insufficient hydrogen bond donors.

Method used

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  • Preparation method of positive material for lithium-sulfur battery
  • Preparation method of positive material for lithium-sulfur battery
  • Preparation method of positive material for lithium-sulfur battery

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Step 1, prepare sulfur-organic solution: mix 2 g elemental sulfur with 20 g carbon disulfide (CS 2 ) were mixed evenly to form a uniform 10wt% sulfur-carbon disulfide solution.

[0032] Step 2: Add 0.5 g of nitric acid-treated carbon black (XE-2) to 10 wt% sulfur-carbon disulfide solution, stir magnetically for 30 min, and naturally volatilize carbon disulfide at room temperature, and obtain sulfur / carbon composites after complete drying. The particle size is about 3-5 mm, such as figure 2 shown.

[0033] Sulfur / carbon composite material is used as the active material, mixed with conductive agent carbon black (SP) and binder polyvinylidene fluoride (PVDF) at a mass ratio of 8:1:1, and N-methyl-2-pyrrolidone (NMP ) as a solvent, the slurry was synthesized with a magnetic stirrer and evenly coated on the current collector Al foil, and then dried in a vacuum oven at 50 °C for 24 h, and set aside. Lithium metal sheet as negative electrode, sulfur / carbon composite materi...

Embodiment 2

[0036] Step 1, preparation of sulfur-organic solution: 1.2 g of elemental sulfur and 120 g of toluene were evenly mixed to form a uniform 1wt% sulfur-toluene solution.

[0037] Step 2: Add 0.5 g carbon black (XE-2) to 1 wt% sulfur-toluene solution, stir magnetically for 30 min, and naturally volatilize the toluene at room temperature, and obtain sulfur / carbon composites after complete drying.

[0038] The method for preparing the positive pole piece and the method for assembling the battery are the same as in Example 1.

[0039] The battery was first charged and discharged at a current density of 50 mA / g, and the voltage range was 1.5-2.8 V. The initial discharge capacity was 928.9 mAh / g, and after 10 cycles, the discharge capacity was 604.2 mAh / g, the capacity retention rate was 65%, and the average efficiency was 72%.

Embodiment 3

[0041] Step 1, preparation of sulfur-organic solution: 2 g of elemental sulfur and 40 g of cyclohexane were evenly mixed to form a uniform 5wt% sulfur-cyclohexane solution.

[0042] Step 2: Add 0.2 g of nitric acid-treated carbon black (XE-2) to 5 wt% sulfur-cyclohexane solution, stir magnetically for 30 min, and naturally volatilize cyclohexane at room temperature, and obtain sulfur / carbon composites after complete drying.

[0043] The method for preparing the positive pole piece and the method for assembling the battery are the same as in Example 1.

[0044] The battery was first charged and discharged at a current density of 50 mA / g, and the voltage range was 1.5-2.8 V. The initial discharge capacity was 936.7 mAh / g, and after 10 cycles, the discharge capacity was 632.1 mAh / g, the capacity retention rate was 67%, and the average efficiency was 71%.

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Abstract

The invention discloses a preparation method of a positive material for a lithium-sulfur battery. The preparation method comprises the steps of: (1) mixing elemental sulfur and an organic solvent uniformly so that the elemental sulfur is completely dissolved to obtain a sulfur-organic solution, wherein the organic solvent is selected from more than one of carbon disulfide, toluene, cyclohexane and normal octane; (2) adding a carbon material into the sulfur-organic solution, stirring uniformly, and removing the solvent to obtain a sulfur/carbon composite material, wherein the carbon material is selected from any more than one of active carbon, mesoporous carbon, carbon black, carbon nano tube and graphene or any more than one of active carbon, mesoporous carbon, carbon black, carbon nano tube and graphene which are acidified. According to the sulfur/carbon composite material, the carbon material with better electrical conductivity is coated on sulfur particles; compared with the pure elemental sulfur positive material, the first-time discharge specific capacity and the cycling performance of the sulfur/carbon composite material are effectively improved; and the preparation process is simple, the time is short, the energy consumption is low and the large-scale production is easy.

Description

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Claims

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Application Information

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Owner SHANGHAI INST OF SPACE POWER SOURCES
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