Electrospinning of pvdf-hfp: novel composite polymer electrolytes (cpes) with enhanced ionic conductivities for lithium-sulfur batteries

Patent metadata

Field	Value
Publication number	US-2020136113-A1
Application number	US-201816628837-A
Country	US
Kind code	A1
Filing date	Jul 9, 2018
Priority date	Jul 7, 2017
Publication date	Apr 30, 2020
Grant date	—

Abstract

The invention relates to lithium ion batteries and, more particularly, to lithium ion conducting composite polymer electrolyte separators. The separators include a nanofiber mat composed of electrospun nanofibers. The nanofibers include a polymer having one or more polar halogen groups, a lithium-containing solid or liquid electrolyte and nanoparticle filler. The polymer, electrolyte and filler are combined to form a solution that is subjected to the electro-spinning process to produce electrospun nanofibers in the form of the mat.

First claim

1 . A lithium ion conducting composite polymer electrolyte separator, comprising:
a nanofiber mat, comprising:
electrospun nanofibers, comprising:
a polymer having one or more polar halogen groups;
a lithium-containing solid or liquid electrolyte; and
nanoparticle filler.

2 . The composite polymer electrolyte separator of claim 1 , wherein the polymer comprises poly(vinylidene fluoride-co-hexafluoro propylene).

3 . The composite polymer electrolyte separator of claim 1 , wherein the electrolyte comprises bis(trifluoromethane)sulfonimide lithium salt.

4 . The composite polymer electrolyte separator of claim 1 , wherein the electrolyte comprises an element selected from the group consisting of magnesium, sodium and mixtures and combinations thereof.

5 . The composite polymer electrolyte separator of claim 1 , wherein the nanoparticle filler comprises nanoparticles selected from the group consisting of transition metal, metal oxide and metal non-oxide selected from Group III, Group IV and Group V of the Periodic Table.

6 . The composite polymer electrolyte separator of claim 5 , wherein the metal oxide is selected from the group consisting of SiO 2 , Al 2 O 3 , B 2 O 3 , fumed SiO 2 , TiO 2 , V 2 O 5 , and mixtures and combinations thereof.

7 . The composite polymer electrolyte separator of claim 5 , wherein the metal non-oxide is selected from the group consisting of nitride, carbide, boride, sulfide, selenide, telluride, phosphide, antimonide, arsenide, bismuthide, and mixtures and combinations thereof.

8 . The composite polymer electrolyte separator of claim 1 , wherein the nanoparticle filler comprises a dopant to form a doped nanoparticle filler.

9 . The composite polymer electrolyte separator of claim 8 , wherein the doped nanoparticle filler is selected from the group consisting of Al 2 O 3 , B 2 O 3 , GeO 2 , SnO 2 , Bi 2 O 3 , Sb 2 O 3 and mixtures thereof.

10 . The composite polymer electrolyte separator of claim 1 , wherein the composite is a membrane.

11 . The composite polymer electrolyte separator of claim 1 , wherein the nanofiber mat comprises multiple layers of the electrospun nanofibers.

12 . The composite polymer electrolyte separator of claim 1 , wherein the electrospun nanofibers have a diameter from 1-5 μm.

13 . A method of preparing a lithium ion conducting composite polymer electrolyte separator, comprising:
preparing a solution, comprising:
a polymer having one or more polar halogen groups;
a lithium-containing solid or liquid electrolyte; and
nanoparticle filler;
electrospinning the solution; forming electrospun nanofibers; forming a nanofiber mat; and activating the nanofiber mat.

14 . The method of claim 13 , wherein the activating step comprises soaking the nanofiber mat in an activation solution.

15 . The method of claim 14 , wherein the activation solution comprises a liquid electrolyte.

Assignees

• Univ Pittsburgh Commonwealth Sys Higher Education

Inventors

• Kumta Prashant N
• Gattu Bharat
• Datta Moni Kanchan
• Velikokhatnyi Oleg
• Shanthi Pavithra Murugavel
• Jampani Hanumantha Prashanth

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M2300/0082

  Organic polymers · CPC title

• D01D5/003

  the material being a polymer solution or dispersion (D01D5/0053 takes precedence) · CPC title

• H01M10/0565

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• D01F1/10

  Other agents for modifying properties · CPC title