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CN-121976309-A - Fiber and preparation method thereof, electrolyte skeleton, electrolyte membrane, battery pack and electronic equipment

CN121976309ACN 121976309 ACN121976309 ACN 121976309ACN-121976309-A

Abstract

The invention provides a fiber and a preparation method thereof, an electrolyte skeleton, an electrolyte membrane, a battery pack and electronic equipment. The fiber comprises a polymer main body and inorganic fillers dispersed in the polymer main body and on the surface of the polymer main body, wherein at least part of the inorganic fillers form bulges on the surface of the fiber, and the D50 of the inorganic fillers is 200-2000 nm. When the fiber is applied to an electrolyte membrane, the mechanical properties of the electrolyte membrane can be improved.

Inventors

  • WANG SHIPENG
  • TANG CHENGYU

Assignees

  • 比亚迪股份有限公司

Dates

Publication Date
20260505
Application Date
20250805

Claims (17)

  1. 1. A fiber characterized in that the fiber comprises a polymer body and an inorganic filler dispersed in and on the polymer body, at least part of the inorganic filler forming protrusions on the surface of the fiber; The D50 of the inorganic filler is 200-2000 nm.
  2. 2. The fiber according to claim 1, wherein the inorganic filler has a D50 of 500-800nm.
  3. 3. The fiber according to claim 1 or 2, wherein the inorganic filler has a D99 of 0.9 to 1.2 μm and/or, The inorganic filler comprises a sulfide solid state electrolyte, and/or, The mass ratio of the inorganic filler to the polymer is (0.46-2.8): 1.
  4. 4. A fiber according to any one of claims 1 to 3, further comprising an auxiliary agent selected from at least one of a lubricant, a compatibilizer, and a coupling agent.
  5. 5. The fiber of claim 4, wherein the fiber comprises, in mass percent: 30-70% of inorganic filler; 25-65% of a polymer; 0-5% of auxiliary agent.
  6. 6. The fiber according to any one of claims 1 to 5, wherein the fiber has a diameter of 5 to 50 μm.
  7. 7. A process for the preparation of a fiber according to any one of claims 1 to 6, comprising melt spinning a feed system comprising an inorganic filler and a polymer to obtain the fiber; The D50 of the inorganic filler is 200-2000 nm.
  8. 8. An electrolyte matrix comprising the fiber of any one of claims 1-7.
  9. 9. The electrolyte matrix of claim 8 wherein the electrolyte matrix comprises the fibers intersecting each other, the fibers forming pores therebetween; The pores have a diameter of 10-200 μm, and/or, The distance between any two adjacent voids is 10-100 μm.
  10. 10. The electrolyte matrix according to claim 8 or 9, wherein the thickness of the electrolyte matrix is 10-80 μm.
  11. 11. An electrolyte membrane comprising the electrolyte skeleton according to any one of claims 8 to 10.
  12. 12. The electrolyte membrane according to claim 11, further comprising a filling portion that fills in pores of the electrolyte skeleton; The filler portion includes a sulfide solid state electrolyte and a binder.
  13. 13. The electrolyte membrane according to claim 12, wherein the mass percentage of the sulfide solid state electrolyte in the filler is 95 to 99%, and the mass percentage of the binder is 0.5 to 5%.
  14. 14. The electrolyte membrane according to any one of claims 11 to 13, wherein the electrolyte membrane has a pre-press thickness of 30 to 120 μm.
  15. 15. A battery comprising the electrolyte membrane according to any one of claims 11 to 14.
  16. 16. A battery pack, characterized in that, the battery pack comprising at least two cells of claim 15.
  17. 17. An electronic device comprising the battery of claim 15 or comprising the battery pack of claim 16.

Description

Fiber and preparation method thereof, electrolyte skeleton, electrolyte membrane, battery pack and electronic equipment Technical Field The invention relates to the technical field of electrochemistry, in particular to a fiber and a preparation method thereof, an electrolyte framework, an electrolyte membrane, a battery pack and electronic equipment. Background With the continuous increase of global energy demands and the increasing environmental protection requirements, electric automobiles are receiving a great deal of attention due to the advantages of zero emission. Liquid lithium ion batteries are widely used in electric vehicles due to their high energy density. However, the electrolyte in the liquid lithium ion battery is easy to burn, so that the liquid lithium ion battery has potential safety hazards such as burning, explosion and the like. To solve this problem, solid electrolytes have been developed. In particular, sulfide solid state electrolytes among solid state electrolytes have received much attention, however, there is room for further improvement in the mechanical properties of existing sulfide solid state electrolytes. Disclosure of Invention In view of this, the present invention provides a fiber that can improve the mechanical properties of an electrolyte membrane when applied to the electrolyte membrane. The invention provides an electrolyte skeleton, which comprises the electrolyte fiber, and can improve the mechanical property of an electrolyte membrane when the electrolyte skeleton is applied to the electrolyte membrane. The present invention provides an electrolyte membrane comprising the above electrolyte skeleton, and thus having excellent mechanical properties. The invention provides a battery which comprises the electrolyte membrane and has longer service life. The invention provides a battery pack comprising the battery, so that the battery pack has excellent service life. The invention provides electronic equipment, which comprises the battery and has excellent cruising ability and service life. In detail, the present invention provides a fiber, wherein the fiber comprises a polymer body and an inorganic filler dispersed inside and on the surface of the polymer body, at least part of the inorganic filler forming protrusions on the surface of the fiber; The D50 of the inorganic filler is 200-2000 nm. A fiber as described above, wherein the inorganic filler has a D50 of 500-800nm. The fiber as described above, wherein the inorganic filler has a D99 of 0.9 to 1.2 μm, and/or, The inorganic filler comprises a sulfide solid state electrolyte, and/or, The mass ratio of the inorganic filler to the polymer is (0.46-2.8): 1. A fiber as described above, wherein the fiber further comprises an auxiliary agent selected from at least one of a lubricant, a compatibilizer, and a coupling agent. The fiber as described above, wherein the fiber comprises, in mass percent: 30-70% of inorganic filler; 25-65% of a polymer; 0-5% of auxiliary agent. A fiber as described above, wherein the fiber has a diameter of 5-50 μm. In a second aspect, the present invention provides a process for the preparation of a fiber as described above, comprising melt spinning a feed system comprising an inorganic filler and a polymer to obtain the fiber; The D50 of the inorganic filler is 200-2000 nm. In a third aspect, the present invention provides an electrolyte matrix, wherein the electrolyte matrix comprises the fibers of the second aspect. An electrolyte skeleton as described above, wherein the electrolyte skeleton includes the fibers intersecting each other, pores being formed between the fibers; The pores have a diameter of 10-200 μm, and/or, The distance between any two adjacent voids is 10-100 μm. The electrolyte skeleton as described above, wherein the thickness of the electrolyte skeleton is 10 to 80 μm. In a fourth aspect, the present invention provides an electrolyte membrane, wherein the electrolyte membrane comprises the electrolyte skeleton of the third aspect. The electrolyte membrane as described above, wherein the electrolyte membrane further includes a filling portion that fills in the pores of the electrolyte skeleton; The filler portion includes a sulfide solid state electrolyte and a binder. The electrolyte membrane as described above, wherein in the filler portion, the sulfide solid electrolyte is 95 to 99% by mass and the binder is 0.5 to 5% by mass. The electrolyte membrane as described above, wherein the electrolyte membrane has a pre-press thickness of 30 to 120 μm. In a fifth aspect, the present invention provides a battery, comprising the electrolyte membrane according to the fourth aspect. In a sixth aspect, the present invention provides a battery pack, wherein the battery pack comprises at least two batteries according to the fifth aspect. In a seventh aspect, the present invention provides an electronic device, including the battery of the fifth aspect or including the battery pack of t