Aqueous electrolyte and aqueous metal ion battery

A water-based electrolyte and electrolyte technology, applied in aqueous electrolytes, secondary batteries, circuits, etc., can solve the problems of low capacity retention or coulombic efficiency, material dissolution, etc., and achieve high coulombic efficiency, capacity retention, and coulombic efficiency The effect of high, high conductivity

Active Publication Date: 2017-11-17
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned electrolytes have achieved high voltage, there are still cases where material dissolution, capacity retention or coulombic efficiency are generally low.

Method used

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  • Aqueous electrolyte and aqueous metal ion battery
  • Aqueous electrolyte and aqueous metal ion battery
  • Aqueous electrolyte and aqueous metal ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0039] 1.44g of water and 11.12g of LiTFSI were mixed and stirred to obtain an aqueous electrolyte. After testing, the conductivity of the aqueous electrolyte is 10 mS / cm.

[0040] The aqueous electrolyte described above is used as the electrolyte, and a three-electrode system is adopted. Li 2 MnO 4 As the working electrode, the Ti sheet is the counter electrode, and Ag / AgCl (saturated KCl) is the reference electrode. Among them, the electrode slurry is prepared according to m (active material): m (polyvinylidene fluoride, PVDF): m (acetylene black) = 75:10:15, and the prepared slurry is coated on the Ti grid, and the positive electrode The mass is about 5-8 mg, and the mass of the negative electrode is 30%-40% more than that of the positive electrode. Put the coated pole pieces into an oven at 80°C, and bake in an air atmosphere for 13 hours. According to the above manufacturing method, the prepared pole piece is assembled into a half battery, and then a full battery (aqu...

Embodiment 2

[0044] Mix 7.12g of G3 with 1.44g of water, then add 11.12g of LiTFSI, stir to obtain an aqueous electrolyte. After testing, the conductivity of the aqueous electrolyte is 3.18mS / cm.

[0045] The aqueous electrolyte described above is used as the electrolyte, and a three-electrode system is adopted. Li 2 MnO 4 As the working electrode, the Ti sheet is the counter electrode, and Ag / AgCl (saturated KCl) is the reference electrode. Among them, the electrode slurry is prepared according to m (active material): m (polyvinylidene fluoride, PVDF): m (acetylene black) = 75:10:15, and the prepared slurry is coated on the Ti grid, and the positive electrode The mass is about 5-8 mg, and the mass of the negative electrode is 30%-40% more than that of the positive electrode. Put the coated pole pieces into an oven at 80°C, and bake in an air atmosphere for 13 hours. According to the above manufacturing method, the prepared pole piece is assembled into a half battery, and then a full b...

Embodiment 3

[0049] Mix 8.92g of G4 with 1.44g of water, then add 11.12g of LiTFSI, and stir to obtain an aqueous electrolyte. After testing, the conductivity of the aqueous electrolyte is 2.62mS / cm.

[0050] The aqueous electrolyte described above is used as the electrolyte, and a three-electrode system is adopted. Li 2 MnO 4 As the working electrode, the Ti sheet is the counter electrode, and Ag / AgCl (saturated KCl) is the reference electrode. Among them, the electrode slurry is prepared according to m (active material): m (polyvinylidene fluoride, PVDF): m (acetylene black) = 75:10:15, and the prepared slurry is coated on the Ti grid, and the positive electrode The mass is about 5-8 mg, and the mass of the negative electrode is 30%-40% more than that of the positive electrode. Put the coated pole pieces into an oven at 80°C, and bake in an air atmosphere for 13 hours. According to the above manufacturing method, the prepared pole piece is assembled into a half battery, and then a fu...

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Abstract

The invention provides an aqueous electrolyte. The aqueous electrolyte comprises water and inorganic salt; the inorganic salt comprises bis(trifluoromethane)sulfonimide lithium salt. By adoption of the specific inorganic salt-bis(trifluoromethane)sulfonimide lithium salt, the coulombic efficiency of a formed aqueous metal ion battery can be improved effectively. By adding ether compounds, particularly specific ether compounds triethylene glycol dimethyl ether or tetraethylene glycol dimethyl ether to the aqueous electrolyte which is formed by water and inorganic salt, the working voltage of the aqueous metal ion battery can be improved, relatively high electrical conductivity can be obtained, and the finally obtained aqueous electrolyte has relatively high coulombic efficiency and capacity retention ratio. Experiment results prove that the capacity retention ratio of the aqueous metal ion battery manufactured from the aqueous electrolyte can be higher than 96% and the coulombic efficiency is higher than 97% in charge-discharge at 1C after 200 cycles.

Description

technical field [0001] The invention relates to the technical field of water-based metal ion batteries, in particular to a water-based electrolyte and a water-based metal-ion battery. Background technique [0002] With the increasing demand for energy, the continuous consumption of non-renewable energy such as petroleum, and the increasing environmental pollution, it is imperative to develop renewable energy such as solar energy, wind energy, and tidal energy. Secondary batteries have become a research hotspot due to their high energy density, long cycle life, and high voltage. However, traditional secondary batteries (such as lead-acid batteries, nickel-metal hydride batteries) use organic electrolytes, and the batteries have disadvantages such as flammability, toxicity, high production costs, and strict assembly conditions, which are likely to cause environmental pollution and are not conducive to environmental sustainability. develop. The use of aqueous electrolyte inst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36
CPCH01M10/36H01M2300/0002Y02E60/10
Inventor 张军陈亮刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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