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Preparation method of lithium/sulfur rechargeable battery electrolyte

A lithium-sulfur secondary battery and electrolyte technology, applied in the field of electrochemistry, can solve problems such as complex process, damage to electrode structure, loss of active material, etc., achieve improved cycle performance and coulombic efficiency, high lithium ion concentration, and simple preparation method Effect

Inactive Publication Date: 2016-04-20
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difficulty in developing lithium-sulfur batteries lies in the following points: (1) Both elemental sulfur in the "charged state" and lithium sulfide in the "discharged state" are insulators, which cause great trouble to the transfer of charge; (2) sulfuration Lithium has poor reversibility, and it is easy to lose electrochemical activity; (3) During the reaction process, the volume of the positive and negative electrode materials changes greatly, and the negative electrode lithium is consumed during the reaction to reduce the volume. structure; (4) The intermediate product polysulfide is easily dissolved in the electrolyte and migrates to the negative electrode, resulting in the loss of active materials and large energy loss; (5) Lithium-sulfur batteries generate various intermediate products during charging and discharging, and A variety of chemical reactions occur simultaneously with electrochemical reactions, the process is extremely complex, and the reaction mechanism is still unclear

Method used

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  • Preparation method of lithium/sulfur rechargeable battery electrolyte
  • Preparation method of lithium/sulfur rechargeable battery electrolyte
  • Preparation method of lithium/sulfur rechargeable battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put 0.13g of graphene, 0.87g of sublimed sulfur, 0.09g of polyvinylidene fluoride (PVDF), 8mL of N-methylpyrrolidone (NMP) and 20g of grinding beads into a ball ink tank, and ball mill on a ball mill at a speed of 350r / min 4h to obtain positive electrode slurry. The adjusted slurry was uniformly coated on the aluminum foil with a thickness of 200 μm by a film applicator, and placed in a vacuum oven, and baked at 60° C. for 20 hours in a vacuum state. Take 10ml of dimethoxyethane and dioxolane according to the volume ratio, mix them evenly, and weigh 1mol / L LiN(CF 3 SO 2 ) 2 Add dimethoxyethane and dioxolane to the mixed solution, fully stir to dissolve, then add 0.5g elemental sulfur and 0.05g elemental lithium, stir at 60°C for 36h, take the supernatant as the electrolyte, and dry it The pole piece is used as the positive pole piece, and the metal lithium piece is used as the negative pole to assemble a button battery, and a 0.2C rate cycle charge and discharge test...

Embodiment 2

[0027] Put 0.13g of graphene, 0.87g of sublimed sulfur, 0.09g of polyvinylidene fluoride (PVDF), 8mL of N-methylpyrrolidone (NMP) and 20g of grinding beads into a ball ink tank, and ball mill on a ball mill at a speed of 350r / min 4h to obtain positive electrode slurry. The adjusted slurry was uniformly coated on the aluminum foil with a thickness of 200 μm by a film applicator, and placed in a vacuum oven, and baked at 60° C. for 20 hours in a vacuum state. Take 10ml of dimethoxyethane and dioxolane according to the volume ratio, mix them evenly, and weigh 1mol / L LiN(CF 3 SO 2 ) 2 Add dimethoxyethane and dioxolane to the mixed solution, stir and dissolve fully, then add 0.5g elemental sulfur and 0.05g elemental lithium, stir at 35°C for 36h, take the supernatant as the electrolyte, and dry it The pole piece is used as the positive pole piece, and the metal lithium piece is used as the negative pole to assemble a button battery, and a 0.2C rate cycle charge and discharge tes...

Embodiment 3

[0029] Put 0.13g of graphene, 0.87g of sublimed sulfur, 0.09g of polyvinylidene fluoride (PVDF), 8mL of N-methylpyrrolidone (NMP) and 20g of grinding beads into a ball ink tank, and ball mill on a ball mill at a speed of 350r / min 4h to obtain positive electrode slurry. The adjusted slurry was uniformly coated on the aluminum foil with a thickness of 200 μm by a film applicator, and placed in a vacuum oven, and baked at 60° C. for 20 hours in a vacuum state. Take 10ml of dimethoxyethane and dioxolane according to the volume ratio, mix them evenly, and weigh 1mol / L LiN(CF 3 SO 2 ) 2 Add dimethoxyethane and dioxolane to the mixed solution, fully stir to dissolve, then add 0.8g elemental sulfur and 0.05g elemental lithium, stir at 35°C for 36h, take the supernatant as the electrolyte, and dry it The pole piece is used as the positive pole piece, and the metal lithium piece is used as the negative pole to assemble a button battery, and a 0.2C rate cycle charge and discharge test...

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Abstract

The invention discloses a preparation method of a lithium / sulfur rechargeable battery electrolyte. An inorganic salt containing lithium cations or an organic salt is used as the electrolyte to be added into an organic solvent, constant-temperature stirring is performed for sufficient dissolution, the concentration of the electrolyte is controlled within the range of 0.01-6 mol / L, elemental sulfur and elemental lithium are added into the organic solvent, constant-temperature stirring is performed to achieve sufficient reaction and dissolution, standing is performed and then a supernate is taken to be used as the electrolyte. The electrolyte can stably exist between positive and negative electrodes of a battery, has the high lithium ion concentration and high conductivity, can sufficiently utilize positive and negative active materials, and can remarkably improve the cycle performance and the coulombic efficiency of the lithium / sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of an electrolyte for a lithium-sulfur secondary battery. Background technique [0002] The grim situation of global energy and environment, especially the huge impact of the international financial crisis on the automobile industry, has pushed countries around the world to accelerate the strategic transformation of transportation energy, setting off a new round of upsurge in the development of new energy vehicles. The international financial crisis has had a huge impact on the auto industry. The global auto industry is facing a major restructuring. Auto products will move towards safety, environmental protection, and energy conservation. "New energy vehicles" will also become the focus of the industry. New energy vehicles It has become the goal and pursuit of competing research and development in various countries. The biggest bottleneck...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/0569H01M10/0568
CPCH01M10/0566H01M10/0568H01M10/0569Y02E60/10
Inventor 文怀梁陈欣侯文荣王春雨李星赵成龙王瑛
Owner SHANDONG YUHUANG NEW ENERGY TECH
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