Water-ether mixed electrolytic solution for lithium ion battery, and preparation method thereof

A technology of lithium-ion batteries and electrolytes, applied in aqueous electrolytes, secondary batteries, circuits, etc., can solve the problems of unfavorable lithium ion transmission, large internal resistance of batteries, low conductivity, etc., achieve multiple selectivity, and inhibit hydrogen evolution reaction , The effect of simple preparation process

Active Publication Date: 2020-07-31
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a mixed electrolyte has a high viscosity, which leads to a huge internal resistance and low conductivity of the battery, resulting in severe polarization and is not conducive to the transmission of lithium ions.

Method used

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  • Water-ether mixed electrolytic solution for lithium ion battery, and preparation method thereof
  • Water-ether mixed electrolytic solution for lithium ion battery, and preparation method thereof
  • Water-ether mixed electrolytic solution for lithium ion battery, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Put 3.0135g LiN(SO 2 CF 3 ) 2 Dissolve in 0.5g ultrapure water, and stir for 24 hours to obtain solution A;

[0031] 2.662g LiN(SO 2 CF 3 ) 2 Dissolve in 0.8515g tetraethylene glycol dimethyl ether, and stir for 24h to obtain solution B;

[0032] (2) Mix solution A and solution B prepared in step (1) according to a mass ratio of 1:1 and stir evenly to obtain a 14.6 mol / L water-ether mixed electrolyte for lithium ion batteries.

[0033] From figure 1 It can be seen from the electrochemical window diagram in the figure that the mixed electrolyte prepared in this example has a wide electrochemical window, about 3V. After testing, it can be known that the conductivity of the mixed electrolyte solution prepared in this example at room temperature is 7.8×10 -3 S / cm.

[0034] The mixed electrolyte prepared in this embodiment and LiMn 2 o 4 / Li 4 Ti 5 o 12 Assemble into full cells and perform electrochemical performance tests. From figure 2 It can be seen tha...

Embodiment 2

[0036] (1) Put 3.0135g LiN(SO 2 CF 3 ) 2 Dissolve in 0.5g ultrapure water, and stir for 24 hours to obtain solution A;

[0037] 2.662g LiN(SO 2 CF 3 ) 2 Dissolve in 0.8515g tetraethylene glycol dimethyl ether, and stir for 24h to obtain solution B;

[0038] (2) Mix solution A and solution B prepared in step (1) according to a mass ratio of 2:1 and stir evenly to obtain a 16.4mol / L water-ether mixed electrolyte for lithium ion batteries.

[0039] After testing, it can be known that the window of the mixed electrolyte prepared in this example is 1.9V~5V, and its conductivity at room temperature is 9×10 -3 S / cm.

[0040] The mixed electrolyte prepared in this embodiment and LiMn 2 o 4 / Li 4 Ti 5 o 12 Assemble into full cells and perform electrochemical performance tests. After testing, it can be known that the full battery has a pair of redox peaks around 1.7V and 2.6V; the first week charge and discharge capacity of the full battery at 3C rate is about 16 8mAh / g, an...

Embodiment 3

[0042] (1) Put 3.0135g LiN(SO 2 CF 3 ) 2 Dissolve in 0.5g ultrapure water, and stir for 24 hours to obtain solution A;

[0043] 2.662g LiN(SO 2 CF 3 ) 2 Dissolve in 0.92g triethylene glycol dimethyl ether, and stir for 24h to obtain solution B;

[0044] (2) Mix solution A and solution B prepared in step (1) according to a mass ratio of 1:1 and stir evenly to obtain a 14.0 mol / L water-ether mixed electrolyte for lithium ion batteries.

[0045] After testing, it can be known that the window of the mixed electrolyte prepared in this example is 1.8V-4.9V, and its conductivity at room temperature is 6×10 -3 S cm -1 .

[0046] The mixed electrolyte prepared in this embodiment and LiMn 2 o 4 / Li 4 Ti 5 o 12 Assemble into full cells and perform electrochemical performance tests. After testing, it can be known that the full battery has a pair of redox peaks around 1.65V and 2.7V; the first week charge and discharge capacity of the full battery at 3C rate is about 170mAh / g...

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Abstract

The invention relates to a water-ether mixed electrolytic solution for a lithium ion battery, and a preparation method thereof, and belongs to the technical field of lithium secondary batteries. According to the invention, the mixed electrolytic solution is obtained by mixing a lithium salt, water and an ether solvent, and has relatively low viscosity, relatively high ionic conductivity and a relatively wide electrochemical stability window; the mixed electrolytic solution and an electrode material can generate a compact SEI film, so that a positive electrode and a negative electrode are protected against corrosion, normal charging and discharging of a common commercial electrode material can be guaranteed, and the electrochemical performance of the common commercial electrode material isimproved; and the preparation process of the mixed electrolytic solution is simple, the raw materials are easy to obtain, safe and pollution-free, and the mixed electrolytic solution is suitable for large-scale batch production.

Description

technical field [0001] The invention relates to a water-ether mixed electrolyte for a lithium ion battery and a preparation method thereof, belonging to the technical field of lithium secondary batteries. Background technique [0002] Lithium-ion (Li-ion) batteries provide a great deal of convenience to our digital and mobile lifestyles. The current lithium-ion batteries mostly use lithium-ion intercalation compounds as electrode materials, and most of the electrolytes are anhydrous organic solutions containing lithium ions. Due to the wide electrochemical window of the non-aqueous electrolyte, it has high energy and power density. Although organic lithium-ion batteries have many advantages, the organic solvents they use are not only toxic but also flammable, and the production cost is greatly increased due to the anhydrous conditions. Due to concerns about safety, cost and environmental impact, they are widely used in automotive electrification and Use in more strategical...

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 陈人杰李月姣尚妍欣陈楠陈实赵娜娜邢易吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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