1results about How to "Reduce edge roughness" patented technology

This disclosure provides a lithium-ion battery and its preparation method. Specifically, the lithium-ion battery includes a positive electrode sheet, which comprises a positive electrode film and a current collector; wherein the positive electrode film comprises a positive electrode active material, a solid electrolyte, a conductive agent, and a binder; wherein the binder exists in the positive electrode film in the form of nanofibers; the nanofibers include a first fiber and a second fiber; the diameter of the first fiber is less than 100 nm, and the average diameter of the first fiber is 3 nm to 25 nm; the diameter of the second fiber is greater than or equal to 100 nm, and the average diameter of the second fiber is 200 nm to 500 nm. By simultaneously applying the first fiber and the second fiber formed by the binder in the positive electrode film or the solid electrolyte layer, it is possible to improve adhesion and tensile strength while providing point-to-point adhesion between particles, reducing edge roughness, and thus improving the capacity and rate performance of the lithium-ion battery.