Asynchronous heating and calendering device, large wide ultra-thin lithium metal foil, preparation method therefor, and application thereof

An asynchronous heating and calendering device for preparing large-width ultra-thin lithium metal foil in a short process, which comprises:

• a pulling-substrate unwinding unit for unwinding a pulling-substrate;
• a lithium strip unwinding unit for unwinding a lithium strip;
• a lithium strip pre-shaping unit;
• an asynchronous heating and calendering unit which comprises:
• a first calendering roller, a second calendering roller and a heating box;
• wherein the pulling-substrate unwinding unit, the lithium strip pre-shaping unit and the asynchronous heating and calendering unit are configured to enable the pulling-substrate to be located on the side of the first calendering roller and the lithium strip to be located on the side of the second calendering roller during calendering;
• the heating box is used to heat the first calendering roller and does not heat the second calendering roller;
• the first calendering roller heats the pulling-substrate, and the first calendering roller and the second calendering roller have parallel axes and are arranged opposite to each other, so that the pulling-substrate and the lithium strip are combined into a composite strip;
• the asynchronous heating and calendering unit can provide a pressure of 3-6 T;
• the first calendering roller can rotate at a speed of 1-5 m/min, the second calendering roller can rotate at a speed of 1-10 m/min, and the first calendering roller and the second calendering roller can rotate at a speed ratio of 1:1.1-8;
• and
• a winding unit for winding the composite strip;
• wherein the lithium strip unwinding unit comprises:
• a lithium strip unwinding roller, a first auxiliary guide roller, a first tension-detecting roller and a speed-measuring roller, which are arranged in sequence;
• wherein the pulling-substrate unwinding unit comprises:
• a substrate unwinding roller, a second auxiliary guide roller, a first deviation-correcting sensor, a third auxiliary guide roller and a fourth auxiliary guide roller, which are arranged in sequence;
• wherein the lithium strip pre-shaping unit comprises:
• a second deviation-correcting sensor and shaping rollers arranged oppositely, which are arranged in sequence;
• and
• wherein the winding unit comprises:
• a second tension-detecting roller, a third deviation-correcting sensor and a composite strip winding roller, which are arranged in sequence.