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Solid polymer electrolyte containing sulfonic acid or phosphoric acid derivative structure and its application in secondary lithium battery

A solid polymer, phosphoric acid derivative technology, applied in secondary batteries, solid electrolytes, non-aqueous electrolytes, etc., can solve problems such as performance that cannot meet application requirements

Active Publication Date: 2019-09-17
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although scientists have made many beneficial explorations in the research of solid polymer electrolytes, the current performance still cannot meet the application requirements

Method used

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  • Solid polymer electrolyte containing sulfonic acid or phosphoric acid derivative structure and its application in secondary lithium battery
  • Solid polymer electrolyte containing sulfonic acid or phosphoric acid derivative structure and its application in secondary lithium battery
  • Solid polymer electrolyte containing sulfonic acid or phosphoric acid derivative structure and its application in secondary lithium battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In a glove box, under an inert atmosphere, configuration P1 (m = 20, n = 100) dimethyl sulfoxide solution, the polymer accounted for about 80% of the solution mass fraction. The solution was thoroughly stirred to obtain a clear and transparent viscous liquid. Scrape the above solution evenly on the seaweed fiber non-woven membrane, set it at 60 o Dry in a C oven for 12 h to form a film. After punching, the electrolyte membrane was dried in a vacuum oven for 12 h, and then soaked in an organic solvent (vinylene carbonate) for 24 h. Depend on figure 1 It can be seen that the polymer electrolyte has an electrochemical window of 0-4.7 V.

[0052]

Embodiment 2

[0054] In a glove box, under an inert atmosphere, configure P2 (m=20, n=20), LiDFOB and silicon dioxide N , N -Dimethylformamide solution, the polymer accounts for about 40% of the mass fraction of the solution. The solution was thoroughly stirred to obtain a clear and transparent viscous liquid. Scrape the above solution evenly on the tetrafluoroethylene plate, set it at 70 o Dry in a C oven for 10 h to form a film. After punching, the electrolyte membrane was dried in a vacuum oven for 20 h, and then placed in a glove box for use. Depend on figure 2 The electrochemical impedance spectroscopy shows that the room temperature ionic conductivity of the electrolyte membrane is 1.04 × 10 -5 S / cm.

[0055]

Embodiment 3

[0057] In a glove box, under an inert atmosphere, configure P3 (m=50, n=100) and titanium dioxide N , N -Dimethylacetamide solution, the polymer accounts for about 10% of the mass fraction of the solution. The solution was thoroughly stirred to obtain a clear and transparent viscous liquid. Scrape the above solution evenly on the cellulose, set at 80 o Dry in a C oven for 24 h to form a film. After punching, the electrolyte membrane was dried in a vacuum oven for 24 h, and then soaked in sulfolane for 24 h. Depend on image 3 As shown, the ternary material (type 622) / lithium battery assembled with the electrolyte membrane still maintains a discharge specific capacity of 135 mAh / g after 50 cycles at room temperature at 1 C.

[0058]

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Abstract

The invention relates to a solid polymer electrolyte, and more particularly to a solid polymer electrolyte containing a sulfonic acid or phosphoric acid derivative structure and its application in a secondary lithium battery. The polymer in the solid electrolyte contains a sulfonic acid or phosphoric acid derivative structural unit, can be flame retarded, thereby reducing the risk of thermal runaway of the battery, and has a wide electrochemical window, and can be applied to a high voltage lithium battery. The invention also provides an application example of the above polymer electrolyte in a secondary lithium battery.

Description

technical field [0001] The invention relates to the field of secondary lithium batteries, in particular to a solid polymer electrolyte containing sulfonic acid or phosphoric acid derivative structure and its application in secondary lithium batteries. Background technique [0002] Due to the advantages of high energy density and good safety, lithium-ion batteries have achieved great development in the fields of mobile devices, electric vehicles, and smart grids. At the same time, the increasingly urgent demand for high-energy-density lithium batteries in the consumer market has greatly promoted research and development in this field. However, the recent serious battery burning accidents in Tesla Model S cars (the battery pack uses ternary materials as the positive electrode active material) have sounded the alarm for the commercial application of lithium batteries. Studies have found that flammable and volatile organic electrolytes are largely responsible for the thermal ru...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0065H01M2300/0085Y02E60/10
Inventor 崔光磊张焕瑞徐红霞王鹏
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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