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A symmetrical aqueous solution lithium-ion battery

A lithium-ion battery and aqueous solution technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle performance of lithium-ion batteries in aqueous solution and cannot meet the standards for industrial applications, so as to save production costs and increase conductivity , the effect of inhibiting the hydrogen evolution reaction

Active Publication Date: 2016-07-06
湖南豪曼新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to reasons such as the hydrogen evolution reaction of the negative electrode, the cycle performance of aqueous lithium-ion batteries is poor and cannot meet the standards for industrial applications.

Method used

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  • A symmetrical aqueous solution lithium-ion battery
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  • A symmetrical aqueous solution lithium-ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 2-3

[0031] The process steps are: use lithium vanadium phosphate as the active material, PVDF as the binder, and conductive carbon black as the conductive agent, mix according to the mass ratio of active material: conductive agent: binder: 8:1:1, grind Uniformly and evenly press-coat on nickel mesh or stainless steel sheet, dry it in a drying oven at 120°C for 5 hours, use it as the positive and negative electrodes, smash it into the original sheet with a diameter of 14mm, and assemble it into a button battery, with the main component being 5molL -1 The lithium sulfate aqueous solution was used as the electrolyte, and the commercial PE-PP film was used as the separator, and its electrochemical cycle performance was tested at room temperature. The cycle performance at 0.5C rate is shown in Table 2.

[0032] Table 2. Experimental conditions and results of embodiment 2-3

[0033]

Embodiment 4-5

[0035]The process steps are: polyvinyl nitrile is used as binder, acetylene black is used as conductive agent, lithium vanadium phosphate is used as active material, and active material: conductive agent: binder is mixed according to the mass ratio of 7:2:1, and ground Evenly, press-coat on the lead-plated nickel sheet or stainless steel mesh collector fluid, dry it in a drying oven at 120 ° C for 5 hours, use it as the positive and negative electrodes, use 15wt.% lithium chloride solution as the electrolyte, and use PVDF-HFP co- The mixed membrane was used as a separator, and it was assembled into a button cell to test its electrochemical cycle performance. Its normal temperature cycle performance at 0.5C rate is shown in Table 3.

[0036] Table 3. Experimental conditions and results of embodiments 4-5

[0037]

Embodiment 6-10

[0039] The process steps are: use CMC / SBR as binder, conductive carbon black as conductive agent, and lithium vanadium phosphate as active material, mix according to the mass ratio of active material: conductive agent: binder: 90:5:5 , ground evenly, scrape-coated on a nickel mesh or stainless steel mesh collector, dried in a drying oven at 120°C for 5 hours, and plated a layer of indium with a thickness of 5-500nm on the surface of the electrode by magnetron sputtering (or electron beam evaporation). -Zinc alloy, using it as positive and negative electrodes, using saturated lithium nitrate solution (adding saturated lithium hydroxide to adjust pH = 8) as electrolyte, using commercial PE film as separator, assembled it into a battery and tested its electrochemical cycle at room temperature performance. Its cycle performance at 0.5C rate is shown in Table 4.

[0040] Table 4. Experimental conditions and results of embodiments 6-10

[0041]

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Abstract

The invention discloses a symmetric aqueous solution lithium ion battery and a modification method. Fluorine lithium vanadium phosphate is simultaneously used as a positive electrode and a negative electrode, and an aqueous solution containing lithium ions serves as electrolyte. An electrode surface serving as the negative electrode is covered with a protection film which is 5-1,000nm thick and has high hydrogen evolution overpotential so as to suppress hydrogen evolution of the negative electrode. According to the symmetric aqueous solution lithium ion battery, the fluorine lithium vanadium phosphate is simultaneously applied to the positive electrode and the negative electrode of water system lithium ions, so that the manufacturing cost of an electrode piece material is reduced. The symmetric aqueous solution lithium ion battery modified by the modification method disclosed by the invention effectively suppresses hydrogen evolution reaction and has the characteristics of long service life, high power, high safety, no environment pollution and the like.

Description

technical field [0001] The invention belongs to the field of lithium-ion secondary batteries, and relates to the provision of novel aqueous lithium-ion batteries. Background technique [0002] The consumption of fossil energy and environmental pollution force the development of clean secondary energy. Lithium-ion batteries have attracted much attention because of their high energy density, high cycle performance and high safety performance. Traditional non-aqueous lithium-ion batteries use organic solutions as electrolytes, which have high synthesis costs, harsh environmental requirements, high operating costs, poor high-rate discharge performance, and potential safety hazards. Aqueous lithium-ion batteries use an aqueous solution containing lithium ions as the electrolyte, which has a much higher conductivity than organic solutions, enabling safe and fast charging and discharging without environmental pollution. [0003] However, limited by the hydrogen and oxygen evolutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/136H01M4/66
CPCH01M4/136H01M4/366H01M4/5825H01M4/628H01M10/0525Y02E60/10
Inventor 李新海王接喜王志兴郭华军陈鑫彭文杰胡启阳
Owner 湖南豪曼新能源科技有限公司
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