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All-solid-state polymer electrolyte and preparation method and application thereof

An all-solid-state polymer and electrolyte technology, which is used in hybrid capacitor electrolytes, electrolyte battery manufacturing, solid electrolyte fuel cells, etc. Low problems, to achieve the effect of excellent battery cycle performance, excellent electrical conductivity and mechanical properties, and improved safety performance

Inactive Publication Date: 2015-11-25
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In a common all-solid-state electrolyte system, such as polyethylene oxide-bistrifluorosulfonimide lithium (PEO-TFSI), the transfer of lithium ions is achieved through the segmental movement of the flexible polymer amorphous region, so in PEO Below the glass transition temperature (about 69°C), the chain segment movement is limited, and the conductivity of the electrolyte system is low
On the other hand, the migratable anions in the small-molecule lithium salts lead to a low lithium ion migration number
Furthermore, the electrochemical stability of this type of electrolyte separator is usually below 4.5V, which can only be used in common lithium battery systems such as lithium iron phosphate, lithium manganese oxide, and lithium cobalt oxide, and cannot be matched with high-voltage electrode materials to prepare high-voltage lithium batteries. The high-voltage lithium battery is an important direction for the development of lithium batteries

Method used

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  • All-solid-state polymer electrolyte and preparation method and application thereof
  • All-solid-state polymer electrolyte and preparation method and application thereof
  • All-solid-state polymer electrolyte and preparation method and application thereof

Examples

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Embodiment 1

[0034] In this embodiment, the all-solid polymer electrolyte is a mixture of polyethylene oxide (PEO) and fluorine-containing sulfonimide lithium ion polymer (PFSI), and the structural formula of the fluorine-containing sulfonimide lithium ion polymer is:

[0035]

[0036] Among them, the ether oxygen bond (-CH 2 The molar ratio of O-) to lithium ions in the fluorine-containing sulfonylimide lithium ion polymer is 25:1.

[0037] The preparation method of the above-mentioned all-solid polymer electrolyte is as follows:

[0038] Take 0.1 g of fluorine-containing sulfonylimide lithium ion polymer (PFSI) and add it to acetonitrile, stir for 5 hours to prepare a PFSI solution with a mass ratio of 10%; take 0.3 g of polyethylene oxide (PEO) and add it to acetonitrile, stir for 5 hours, Prepare a PEO solution with a mass ratio of 10%; mix the PFSI solution and the PEO solution, and stir magnetically for about 10 hours to obtain a mixed solution; in a desiccator, pour the mixed so...

Embodiment 2

[0048] In this example, the all-solid polymer electrolyte is basically the same as in Example 1, except that the ether oxygen bond (-CH 2 The molar ratio of O-) to lithium ions in the fluorine-containing sulfonimide lithium ion polymer is 30:1.

[0049] The preparation method of the solid polymer electrolyte in this example is basically the same as that of the example, except that the ether oxygen bond (-CH 2 The molar ratio of O-) to lithium ions in the fluorine-containing sulfonimide lithium ion polymer is 30:1.

[0050] According to the AC impedance spectrum of the all-solid polymer electrolyte, the conductivity of the all-solid polymer electrolyte at 80°C is 1.85×10 -4 S / cm.

[0051] Same as Example 1, lithium iron phosphate was used to make the positive electrode, and lithium sheets were used to make the negative electrode, and assembled with the all-solid polymer electrolyte in this example in a glove box to obtain an all-solid lithium secondary battery. Tests show th...

Embodiment 3

[0054] In this example, the all-solid polymer electrolyte is basically the same as in Example 1, except that the ether oxygen bond (-CH 2 The molar ratio of O-) to lithium ions in the fluorine-containing sulfonylimide lithium ion polymer is 20:1.

[0055] The preparation method of the solid polymer electrolyte in this example is basically the same as that of the example, except that the ether oxygen bond (-CH 2 The molar ratio of O-) to lithium ions in the fluorine-containing sulfonylimide lithium ion polymer is 20:1.

[0056] According to the AC impedance spectrum of the all-solid polymer electrolyte, the conductivity of the all-solid polymer electrolyte at 80°C is 7.5×10 -5 S / cm.

[0057] Same as Example 1, lithium iron phosphate was used to make the positive electrode, and lithium sheets were used to make the negative electrode, and assembled with the all-solid polymer electrolyte in this example in a glove box to obtain an all-solid lithium secondary battery. Tests show...

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Abstract

The invention provides all-solid-state polymer electrolyte. The electrolyte is a mixture of a fluorine-containing sulfonyl imide ion polymer and an ether oxo-containing polymer, wherein the mixture contains an -SO2N<->SO2- superacid polyanion structure; relatively high ionic conductivity and ion transference number can be obtained without adding a solvent; and meanwhile, an electrochemical window which is greater than 6V is obtained. An all-solid-state lithium secondary battery employing an electrolyte membrane can be charged and discharged at above 60 DEG C. Therefore, the all-solid-state polymer electrolyte has a wide application prospect in the fields such as a lithium-sulfur battery system, a high-voltage lithium battery system, a super capacitor and a high-temperature fuel cell.

Description

technical field [0001] The invention relates to the technical field of polymer electrolytes, in particular to an all-solid polymer electrolyte, its preparation method and application. Background technique [0002] Since the beginning of the 21st century, industry has developed rapidly, science and technology have been advancing day by day, and human demand for energy is increasing day by day. However, the excessive consumption of non-renewable energy is not conducive to the maintenance of ecological balance and sustainable development. Finding an environmentally friendly and effective new energy system is an urgent problem to be solved. As a result, new energy systems such as lithium-ion batteries, supercapacitors, and fuel cells have become research hotspots around the world. [0003] Electrolyte material is the carrier of ion transmission in the new energy system, and it is also the key material for the normal operation of the new energy system. Taking lithium batteries ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01G11/56H01M8/12
CPCY02E60/10Y02E60/13Y02E60/50Y02P70/50
Inventor 薛立新石倩茹秦德君杜冰王健
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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