A kind of polymer solid electrolyte membrane and preparation method thereof

Abstract

The invention discloses a polymer solid electrolyte membrane and preparation method thereof. The polymer solid electrolyte membrane comprises a polymer matrix and a composite ionic liquid, and the composite ionic liquid comprises lithium salt and N-containing heterocyclic compound. According to the invention, by introducing the ionic liquid into the polymer solid electrolyte membrane, the both advantages of the ionic liquid and the the polymer solid electrolyte membrane are achieved, and the self-supporting electrolyte with independent from water, high conductivity, good security, good ionic conductivity and high mechanical property is obtained. The invention can be widely used in the fields of lithium ion battery, and has a good application prospect in the fields of electronics, medical treatment, space technology, electrochrimic technique, photoelectricity, sensors and the like.

Description

technical field

[0001] The invention belongs to the technical field of polymer electrolyte membranes, and in particular relates to a high-performance polymer solid electrolyte membrane and a preparation method thereof. Background technique

[0002] In recent years, due to the increasingly prominent contradictions among energy, resources, and the environment, countries around the world have introduced policies and measures to promote the development of new energy technologies and increased capital investment. In the field of new energy technology, as a new type of clean and renewable secondary energy, lithium-ion batteries have the advantages of high working voltage, high energy density, and light weight. And other fields have been widely used and show a strong development trend.

[0003] At present, liquid electrolytes are widely used in lithium-ion batteries, because they contain flammable and volatile organic solvents, which will release flammable gases during charging an...

Examples

Embodiment 1

[0031] Step 1: In the glove box, weigh 24 grams of lithium bis(trifluoromethylsulfonyl)imide in a 50ml flask, take out the flask from the glove box, add 5ml deionized water and stir evenly at 0°C, while Add 8.84 grams of 1-ethylimidazole dropwise, react for 10 hours, and dry to obtain a composite ionic liquid, which is put into a glove box for use;

[0032] Step 2: Dissolve 12 grams of poly(vinylidene fluoride-hexafluoropropylene) in 108 grams of N-methyl-pyrrolidone, then add the composite ionic liquid obtained in step 1, and cast to form a film to obtain the target polymer solid electrolyte membrane .

[0033] The appearance of the target polymer solid electrolyte membrane is as follows figure 1 As shown, the AC impedance spectrum as figure 2 As shown, the room temperature ionic conductivity according to the AC impedance test is 2.0mS / cm.

Embodiment 2

[0035] Step 1: In the glove box, weigh 24 grams of lithium hexafluorophosphate in a 50 ml flask, take out the flask from the glove box, add 4 ml of methanol and stir evenly at 0 ° C, while adding 17.75 grams of 1-methylpyrrolidine dropwise, reaction 8 Hour, dry and obtain composite ionic liquid, put into glove box and stand-by;

[0036] Step 2: Dissolve 24 grams of polypyrrole in 130 grams of N,N-dimethylacetamide, take out 30 grams of the solution, add 6 grams of the composite ionic liquid obtained in step 1, stir to form a casting solution, and cast to obtain Target polymer solid electrolyte membrane. According to the AC impedance test, its room temperature ionic conductivity is 2.3mS / cm.

Embodiment 3

[0038] Step 1: In the glove box, weigh 24 grams of lithium tetrafluoroborate in a 50 ml flask, take out the flask from the glove box, add 5 ml of methanol and stir evenly at 0 ° C, and drop 24 grams of 1-methylpyrazole at the same time , after reacting for 7 hours, dry to obtain the composite ionic liquid, put it into the glove box for use;

[0039] Step 2: Dissolve 20 grams of polyoxyethylene in 150 grams of N-methyl pyrrolidone, take out 30 grams of polyoxyethylene solution and add 12 grams of the composite ionic liquid obtained in step 1, stir to form a casting solution, and cast to obtain the target Polymer solid electrolyte membrane. According to the AC impedance test, its room temperature ionic conductivity is 3.4mS / cm.

technical field

[0001] The invention belongs to the technical field of polymer electrolyte membranes, and in particular relates to a high-performance polymer solid electrolyte membrane and a preparation method thereof. Background technique

[0002] In recent years, due to the increasingly prominent contradictions among energy, resources, and the environment, countries around the world have introduced policies and measures to promote the development of new energy technologies and increased capital investment. In the field of new energy technology, as a new type of clean and renewable secondary energy, lithium-ion batteries have the advantages of high working voltage, high energy density, and light weight. And other fields have been widely used and show a strong development trend.

[0003] At present, liquid electrolytes are widely used in lithium-ion batteries, because they contain flammable and volatile organic solvents, which will release flammable gases during charging an...

Examples

Embodiment 1

[0031] Step 1: In the glove box, weigh 24 grams of lithium bis(trifluoromethylsulfonyl)imide in a 50ml flask, take out the flask from the glove box, add 5ml deionized water and stir evenly at 0°C, while Add 8.84 grams of 1-ethylimidazole dropwise, react for 10 hours, and dry to obtain a composite ionic liquid, which is put into a glove box for use;

[0032] Step 2: Dissolve 12 grams of poly(vinylidene fluoride-hexafluoropropylene) in 108 grams of N-methyl-pyrrolidone, then add the composite ionic liquid obtained in step 1, and cast to form a film to obtain the target polymer solid electrolyte membrane .

[0033] The appearance of the target polymer solid electrolyte membrane is as follows figure 1 As shown, the AC impedance spectrum as figure 2 As shown, the room temperature ionic conductivity according to the AC impedance test is 2.0mS / cm.

Embodiment 2

[0035] Step 1: In the glove box, weigh 24 grams of lithium hexafluorophosphate in a 50 ml flask, take out the flask from the glove box, add 4 ml of methanol and stir evenly at 0 ° C, while adding 17.75 grams of 1-methylpyrrolidine dropwise, reaction 8 Hour, dry and obtain composite ionic liquid, put into glove box and stand-by;

[0036] Step 2: Dissolve 24 grams of polypyrrole in 130 grams of N,N-dimethylacetamide, take out 30 grams of the solution, add 6 grams of the composite ionic liquid obtained in step 1, stir to form a casting solution, and cast to obtain Target polymer solid electrolyte membrane. According to the AC impedance test, its room temperature ionic conductivity is 2.3mS / cm.

Embodiment 3

[0038] Step 1: In the glove box, weigh 24 grams of lithium tetrafluoroborate in a 50 ml flask, take out the flask from the glove box, add 5 ml of methanol and stir evenly at 0 ° C, and drop 24 grams of 1-methylpyrazole at the same time , after reacting for 7 hours, dry to obtain the composite ionic liquid, put it into the glove box for use;

[0039] Step 2: Dissolve 20 grams of polyoxyethylene in 150 grams of N-methyl pyrrolidone, take out 30 grams of polyoxyethylene solution and add 12 grams of the composite ionic liquid obtained in step 1, stir to form a casting solution, and cast to obtain the target Polymer solid electrolyte membrane. According to the AC impedance test, its room temperature ionic conductivity is 3.4mS / cm.

Images