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An electrolyte for super capacitance cell

A supercapacitor battery and electrolyte technology, which is applied in the field of electrolyte, can solve problems such as low solubility, low conductivity, and small number of ions, and achieve high power density, long energy density, and improved dissociation and mobility. Effect

Inactive Publication Date: 2009-03-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing lithium salts such as LiPF 6 The solubility in the solvent of the capacitor electrolyte is not high, and the number of ions in the solution is small, resulting in low conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] At normal temperature and pressure, water is divided into 3ppm, and under the environment of inert gas, the solvent with a purity of more than 99.95%, 10% propylene carbonate, 21% ethylene carbonate, 29.5% dimethyl carbonate, and 10% ethyl methyl carbonate Mix well, dissolve 16% lithium salt LiPF in the mixed solvent 6 , 12.5% ​​Et 4 NBF 4 , added in four times on average, the time interval between each addition is 2h, shake well after adding, and finally add 1.0% acetamide. Configured as an electrolyte.

[0018] Using commercial spinel LiMn 2 o 4 And activated carbon, weigh LiMn by weight ratio 3:7 2 o 4 Mixed with activated carbon as positive electrode active material. The positive electrode ingredients are mixed according to the weight ratio of active material: carbon black: binder = 80:12:8, uniformly coated on the aluminum foil current collector with a thickness of 25 μm, and dried at 120 ° C to form an electrode. A mixture of commercial artificial graphite...

Embodiment 2

[0022] Mix 10% propylene carbonate, 10.5% ethylene carbonate, 32% dimethyl carbonate, and 10% ethyl methyl carbonate, and dissolve 16% lithium salt LiPF in the mixed solvent 6 , 20% MeEt 3 NBF 4 , the acetamide of 1.5%, all the other are with embodiment 1. The measured moisture content was 6ppm, and the conductivity was 17mS / cm.

[0023] Working in the voltage range of 2.2-4.0V, the discharge current is 1C and the capacity is 4Ah. The 10C charge and discharge capacity is maintained at 3.7Ah, and after 2000 cycles, the capacity retention rate is >90%.

Embodiment 3

[0025] Mix 23% acetonitrile, 10.5% ethylene carbonate, 24.5% dimethyl carbonate, and 6% ethyl methyl carbonate, and dissolve 10% lithium salt LiPF in the mixed solvent 6 , 24% MeEt 3 NBF 4 , 2% acetamide and all the other are the same as in Example 1. The measured moisture content was 6ppm, and the conductivity was 25mS / cm.

[0026] Working in the voltage range of 2.2-4.0V, the discharge current is 1C and the capacity is 4Ah. The 10C charge and discharge capacity is maintained at 3.9Ah, and after 2000 cycles, the capacity retention rate is >93%.

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Abstract

The invention discloses an electrolyte to prepare hyper capacitance battery, which comprises the following parts: lithium salt, non-water organic solvent and additive, wherein the non-water organic solvent is at least two parts of dimethyl carbonate, diethyl carbonate, propylene carbonate ester, ethyl carbonate ester, sulfite vinyl ester, sulfite propone ester, butane ester carbonate, Y-butyrolactone, methyl vinyl carbonate, methyl propyl ester carbonate, acetic ester and acetonitrile. The invention is compatible with capacitance and battery, which possesses high-power density, large current discharge and good circulating life.

Description

technical field [0001] The invention relates to an electrolytic solution for an electrochemical energy storage device, in particular to an electrolytic solution for a supercapacitor battery. Background technique [0002] The supercapacitor battery system is a new type of green energy storage system that combines supercapacitors with secondary batteries (currently mainly lithium-ion batteries) and is expected to have both advantages. In the supercapacitor battery system, there are two ways to combine the two energy storage systems of the supercapacitor and the secondary battery. or system); the other is the "internal combination" formula (that is, the two are organically combined in the same monomer). A new type of energy storage device based on the interfacial double layer of the supercapacitor and the intercalation and deintercalation of the lithium-ion battery - the supercapacitor battery, which has the characteristics of both capacitor and battery dual-function energy st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M16/00H01M10/40H01G9/022H01G9/028
CPCY02E60/122
Inventor 张治安曾涛李劼赖延清李晶李荐丁凤其金旭东郑文波
Owner CENT SOUTH UNIV