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Aqueous lithium ion electrolyte and battery

A lithium ion and electrolyte technology, applied in the field of secondary batteries, can solve the problems of high electrolyte viscosity, large amount of lithium salt, high cost, etc., and achieve the effects of low viscosity, high ion conductivity, and high Coulombic efficiency

Pending Publication Date: 2021-02-12
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such methods usually need to use expensive lithium salts such as lithium trifluorosulfonimide, etc., and the amount of lithium salts is very large, which makes the preparation of the aqueous electrolyte very expensive, and the electrolyte viscosity is very high. Large, it will cause salt precipitation

Method used

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  • Aqueous lithium ion electrolyte and battery
  • Aqueous lithium ion electrolyte and battery
  • Aqueous lithium ion electrolyte and battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1-13

[0023] Dimethyl sulfone (M), lithium perchlorate (L), pure water (H), and urea (U) were used as raw materials, mixed according to a certain ratio and ground, and the mixture was placed in a water bath at 50°C until ultrasonic Obtain a transparent homogeneous solution, and test the electrochemical stability window, conductivity, viscosity, pH value, liquidus temperature, etc. of the obtained solution.

[0024] The various test parameters of embodiment 1-13 gained solution are as figure 1 shown.

Embodiment 14-20

[0026] Dimethyl sulfone (M), lithium perchlorate (L) and pure water (H) are used as raw materials, mixed according to a certain ratio and then ground, and the mixture is placed in a water bath at 50°C until a transparent homogeneous phase is obtained. solution, and test the electrochemical stability window, conductivity, viscosity, pH value, liquidus temperature, etc. of the obtained solution.

[0027] The various test parameters of embodiment 14-20 gained solution are as figure 1 shown.

Embodiment 21

[0029] With the solution prepared in embodiment 2 as electrolyte, lithium manganate (LiMn 2 o 4 ) and titanium niobate (TiNb 2 o 7 ) are the positive and negative active materials of aqueous lithium-ion batteries, respectively. According to the active material:conductive agent:binder mass ratio of 8:1:1, the corresponding amount was weighed, and an appropriate amount of N-methylpyrrolidone (NMP) was added to grind it into a battery slurry. The method of manual mixing and coating, the hand-ground battery slurry positive electrode is uniformly coated on the titanium foil with a coating film applicator (200 μm), and the negative electrode is evenly coated on the aluminum foil with a coating film applicator (100 μm) superior. Then transfer the coated positive and negative electrodes to an oven at 100°C and 90°C for 10 hours, and use a pole piece punch to make the dried positive and negative electrodes into circular pole pieces with a diameter of 16mm, among which the positive ...

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Abstract

The invention discloses an aqueous lithium ion electrolyte, which is characterized in that the electrolyte is formed by compounding dimethyl sulfone, lithium perchlorate, urea and water according to amolar ratio of (0.5-2): (0.5-1.6): (0.5-2): (0.3-2), and is a transparent homogeneous solution obtained by mixing and grinding four raw materials and then placing the mixture in a water bath for ultrasonic treatment. According to the invention, cheap non-flammable organic small molecules, lithium salt and water are creatively adopted to act together to broaden an electrochemical stability window,the prepared electrolyte has high ionic conductivity, low viscosity and good high and low temperature phase stability retentivity, the whole preparation process is simple and easy to implement, the preparation cost is reduced, and the electrolyte is very beneficial to realize industrial production.

Description

technical field [0001] The invention belongs to the field of secondary batteries, and in particular relates to an aqueous electrolyte used for lithium ion batteries and a lithium ion battery prepared on the basis of the electrolyte. Background technique [0002] Lithium-ion secondary batteries have been widely recognized since their introduction in the 1990s due to their advantages such as high energy density and long cycle life. At present, they have been widely used in electronic product power supplies, electric vehicles, energy storage and other fields. [0003] Traditional lithium-ion batteries mainly use organic electrolytes. This is mainly because the traditional LCO / graphite system lithium-ion batteries have a high voltage, which exceeds the stable voltage window of aqueous electrolytes. Therefore, only organic solution electrolytes can be used, but this type of lithium-ion batteries There are high safety hazards of low electrical conductivity and easy combustion and ...

Claims

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Application Information

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IPC IPC(8): H01M10/36H01M10/42
CPCH01M10/36H01M10/4235H01M2300/0002H01M2300/0091Y02E60/10
Inventor 毛武涛李茂龙钱逸泰马超丁一鸣贺畅曹志翔鲍克燕
Owner JIANGSU UNIV OF TECH
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