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Aqueous lithium-ion batteries and electrodes therefor

A lithium-ion battery and aqueous solution technology, applied in battery electrodes, negative electrodes, electrode manufacturing, etc., can solve problems such as high cost and expand working voltage, and achieve the effects of prolonging cycle life, inhibiting hydrogen production reaction, and improving the working voltage window

Active Publication Date: 2021-07-23
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while using high-concentration LiTFSI electrolyte to expand the working voltage, it also faces the problem of high cost.

Method used

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  • Aqueous lithium-ion batteries and electrodes therefor
  • Aqueous lithium-ion batteries and electrodes therefor
  • Aqueous lithium-ion batteries and electrodes therefor

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0049] First, polyvinylidene fluoride (PVDF) powder is added into dimethylacetamide (DMAC) solvent to prepare a homogeneous solution of PVDF. The above-mentioned solvents correspond to solvents that can dissolve and form a homogeneous or uniform suspension solution according to different materials, for example: PVDF with DMAC solvent, PVDF with N-methylpyrrolidone (NMP) solvent or PTFE with ethanol (Ethanol) solvent . Subsequently, the homogeneous solution was evenly coated on the titanium sheet as the current collector by blade coating, and dried in an oven to completely evaporate the solvent, so as to form a PVDF layer as the first layer on the current collector. The water contact angle of the PVDF layer is captured by the fast camera according to the time change as follows: figure 2 The schematic diagram shown. From figure 2 It can be obtained that the water contact angle of the PVDF layer is 81.84° at 0 minutes and 54.13° at 50 minutes. In other words, the water cont...

experiment example 1

[0054]The electrode of comparative preparation example 1 and preparation example 1 is placed in 10m LiTFSI aqueous solution electrolyte, carries out cyclic voltammetry scanning with 1mV / s scan rate, obtains Figure 3A and Figure 3B . Figure 3A Show the cyclic voltammetry spectrum of the first circle of comparative preparation example 1 and preparation example 1; Figure 3B The cyclic voltammetry spectra of Comparative Preparation Example 1 and the 5th cycle of Preparation Example 1 are shown.

[0055] Depend on Figure 3A It can be obtained that the hydrogen production current in the first cycle of Comparative Preparation Example 1 at -1.8V (vs.Ag / AgCl) is about 25mA / cm 2 , while the hydrogen production current of Preparation Example 1 is about 0.25mA / cm in the first circle of voltage -1.8V (vs.Ag / AgCl). 2 . Therefore, at the same hydrogen production potential (-1.8V vs. Ag / AgCl), the hydrogen production current of the electrode of Preparation Example 1 is much lower th...

preparation example 2

[0058] Electrodes were fabricated in the same manner as in Preparation Example 1, but the titanium sheets were changed to aluminum foils.

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Abstract

An aqueous solution lithium ion battery and an electrode used therein, wherein, the electrode includes a current collector, a coating layer and a composite film layer. The coating layer is arranged on at least one surface of the current collector, and the coating layer includes active materials. The composite film layer is arranged on one surface of the coating layer. The composite film layer includes a first layer and a second layer, wherein the first layer is between the second layer and the surface of the coating layer, and the first layer and the second layer have different water contact angles.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an aqueous solution lithium ion battery and an electrode used therein. Background technique [0002] Currently, commercially available lithium-ion batteries mostly use organic electrolytes. However, batteries using such organic electrolytes have safety concerns. Due to the increasing demand for energy density and power density of energy storage devices, organic electrolytes must withstand a greater number of operating voltages and operating currents. However, taking the common ester electrolyte solvent as an example, this ester electrolyte solvent has flammable and reactive chemical characteristics, so when the lithium-ion battery is used under high current, long time and high temperature environment, the electrolyte may vaporize , oxidation, and even combustion; at the same time, as the most widely used solute salts in lithium-ion batteries: lithium h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/36H01M4/02
CPCH01M10/36H01M4/628H01M4/02H01M2004/021H01M2300/0002H01M4/0404H01M4/625H01M4/626H01M4/621H01M4/624H01M4/622H01M4/623H01M4/485H01M4/48H01M4/5815H01M4/587H01M4/58H01M2004/027Y02E60/10Y02P70/50H01M4/366
Inventor 朱哲纬吴弘俊吴乃立林玉祥
Owner IND TECH RES INST
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