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Preparation method and application of lithium-sulfur battery electrolyte solution

An electrolyte preparation, lithium-sulfur battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor cycle stability, gaps, etc., and achieve the effects of simple preparation, low price, and cost reduction

Inactive Publication Date: 2014-03-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Institute of Chemical Defense reported in 2007 that it had developed a 300 Wh kg -1 Lithium-sulfur flexible packaging battery, Tsinghua University also reported in 2008 developed a 246 Wh kg -1 Flexible packaging batteries, but there is still a gap with foreign indicators
[0003] At present, lithium-sulfur batteries still have the following problems: (1) The positive electrode active material sulfur-containing material and the discharge product are ion / electronic insulation; (2) The intermediate product of sulfur-containing material charging and discharging-lithium polysulfide (Li 2 S n , 3 ≤ n≤ 8) It is easily soluble in organic electrolyte, and diffuses to the lithium negative electrode through the electrolyte, and is reduced on its surface to form low-priced polysulfide ions, and then diffuses back to the positive electrode
At present, the electrolyte solvent used in lithium-sulfur batteries is mainly 1:1 1,3-dioxolane (DOL) and ethylene glycol dimethyl ether (DME) mixed solvent (DOL+DME), and the electrolyte is mainly LiTFSI, but Sulfur-containing materials exhibit extremely poor cycle stability in such electrolytes

Method used

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  • Preparation method and application of lithium-sulfur battery electrolyte solution
  • Preparation method and application of lithium-sulfur battery electrolyte solution
  • Preparation method and application of lithium-sulfur battery electrolyte solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 0.5 M Li 2 S 8 / DOL+DME electrolyte preparation: measure 10 mL ether organic solvent DOL+DME (volume ratio 1:1), add 1120 mg elemental sulfur (35 mmol) and 230 mg lithium sulfide (5 mmol) respectively, seal and take out In a glove box, sonicate for 1 h and react at 60 °C for 3–5 h; then add 69 mg (0.1 mol) LiNO to the above electrolyte in the glove box 3 Additive, standing for 6~8 h, then get 0.5 M Li 2 S 8 / DOL+DME electrolyte.

[0020] Battery assembly and testing: Evenly mix elemental sulfur, acetylene black, and binder at a mass ratio of 70:20:10, then add N-methyl-2-pyrrolidone (NMP), make a slurry, and coat it on aluminum foil. After drying, a lithium-sulfur battery cathode sheet is obtained. A lithium-sulfur battery was assembled using metallic lithium as the negative electrode, and the electrolyte was newly configured 0.5 M Li 2 S 8 / DOL+DME. The charge and discharge cut-off voltage is 1.5~3.0 V ( vs. Li / Li + ), charge-discharge cycles were performed ...

Embodiment 2

[0022] 0.5 M Li 2 S 4 / DOL+DME electrolyte preparation: Weigh 480 mg of elemental sulfur (15 mmol) and 230 mg of lithium sulfide (5 mmol) according to the stoichiometric ratio and add 10 mL of mixed ether organic solvent DOL+DME (volume ratio is 1:1) , after fully reacting, add 69 mg of LiNO 3 Additive, concrete steps are with embodiment one.

[0023] Battery assembly and testing: The preparation process of the sulfur electrode pole piece is the same as in Example 1, and the electrolyte used in battery assembly is 0.5 M Li 2 S 4 / DOL+DME. Electrochemical test conditions are the same as in Example 1. For the first time, the sulfur electrode has a specific capacity of 281 mAh g in this electrolyte -1 , after 200 cycles, its specific capacity increased to 346 mAh g -1 .

Embodiment 3

[0025] 0.5 M Li 2 S 8 / DOL+DME electrolyte deployment: the specific steps are the same as in Example 1.

[0026]Preparation of graphene / sulfur composite material: According to the mass ratio of 600 mg elemental sulfur and 400 mg graphene, fully mixed and ground, and treated at 155 °C for 12 h, the graphene / sulfur composite material was obtained.

[0027] Battery assembly and testing: Evenly mix graphene / sulfur composite material, acetylene black, and binder at a mass ratio of 70:20:10, then add N-methyl-2-pyrrolidone (NMP), make a slurry, and then coat On the aluminum foil, after drying, the graphene / sulfur positive electrode sheet is obtained, and the electrolyte used for battery assembly is 0.5 M Li 2 S 8 / DOL+DME. Electrochemical test conditions are the same as in Example 1. Graphene / sulfur electrode achieves first specific capacity of 1337 mAh g in this electrolyte -1 , after 200 cycles, its specific capacity still maintains 1085 mAh g -1 , The capacity retention ra...

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Abstract

The invention discloses a preparation method and application of a lithium-sulfur battery electrolyte solution. The electrolyte solution mainly comprises an ether organic solvent, novel electrolyte (namely lithium polysulfide with different concentrations and different chemical compositions) and an additive. The specific preparation method of the electrolyte solution comprises the steps of taking a certain volume of ether organic solvent from a glove box, adding a certain amount of elemental sulfur and lithium polysulfide according to a stoichiometric ratio, sealing, then taking out of the glove box, and fully reacting after ultrasonic treatment; adding the additive LiNO3 into the electrolyte solution in the glove box, and standing to obtain the novel lithium-sulfur battery electrolyte solution. The electrolyte solution formula disclosed by the invention is suitable for different sulfur-based positive materials and is capable of obviously prolonging the cycle service life of a sulfur electrode.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur battery electrolyte, and in particular relates to a preparation method and application of lithium-sulfur battery electrolyte. Background technique [0002] In recent years, lithium-sulfur batteries with high theoretical energy density have become a research hotspot. Lithium-sulfur batteries use elemental sulfur as the positive electrode and metallic lithium as the negative electrode. Theoretically, the complete reaction of elemental sulfur and metallic lithium to form lithium sulfide can realize 2-electron reaction, and its theoretical energy density can reach 2600 Wh kg -1 , far higher than the energy density of existing lithium-ion batteries. In addition, the cathode material sulfur also has the advantages of abundant reserves, environmental friendliness, and low price. Therefore, lithium-sulfur batteries are regarded as a high-energy, green, and cheap secondary battery, which has great applicat...

Claims

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Application Information

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IPC IPC(8): H01M10/36
CPCH01M10/0568Y02E60/10
Inventor 张校刚丁兵徐桂银
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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