Deep cooling asynchronous rolling method for preparing lamellar copper/lithium composite foil
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A technology of asynchronous rolling and composite foil, applied in metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of pure lithium material oxidation, inability to prepare copper/lithium composite foil, material combustion, etc.
Active Publication Date: 2018-08-24
CENT SOUTH UNIV
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However, when the composite rolling of pure lithium material and pure copper material is carried out, due to the plastic deformation during the rolling process, the temperature of the m
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application example 1
[0039] The 50 μm thick layered copper / lithium composite foil is prepared by cryogenic asynchronous rolling, and the steps are as follows:
[0040] The first step: using pure lithium and pure copper metal foils as raw materials, the thickness before lithium rolling is 100 μm, and the thickness before copper rolling is 50 μm.
[0041] Step 2: Metal copper foil and metal lithium foil are cut into rectangular sizes. The width of the copper foil is the same as that of the lithium foil, but the length of the copper foil is twice that of the lithium foil.
[0042] Step 3: Fold the copper foil in half along the length direction to completely cover the lithium foil.
[0043] Step 4: Put the material into a deep freezer for cooling for 10 minutes to achieve uniform cooling of the material temperature. The cryogenic box is cooled with nitrogen, and the cooling temperature range is -190°C.
[0044] Step 5: Take the material out and perform cryogenic rolling at a reduction ratio ((H-h) / H...
application example 2
[0052] The 30 μm thick layered copper / lithium composite foil is prepared by cryogenic asynchronous rolling, and the steps are as follows:
[0053] The first step: using pure lithium and pure copper metal foils as raw materials, the thickness before lithium rolling is 50 μm, and the thickness before copper rolling is 25 μm.
[0054] Step 2: Metal copper foil and metal lithium foil are cut into rectangular sizes. The width of the copper foil is the same as that of the lithium foil, but the length of the copper foil is twice that of the lithium foil.
[0055] Step 3: Fold the copper foil in half along the length direction to completely cover the lithium foil.
[0056] Step 4: Put the material into a deep freezer for cooling for 10 minutes to achieve uniform cooling of the material temperature. The cryogenic box is cooled with nitrogen, and the cooling temperature range is -150°C.
[0057] Step 5: Take the material out and perform cryogenic rolling at a reduction ratio ((H-h) / H)...
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Abstract
Provided is a deep cooling asynchronous rolling method for preparing lamellar copper/lithium composite foil. Copper foil and lithium foil are shorn into a rectangle size, the thickness of the copper foil is 1/2 that of the lithium foil, the width of the copper foil is equal to that of the lithium foil, and the length of the copper foil is twice that of the lithium foil; the copper foil is oppositely folded in the length direction, the lithium foil is completely wrapped, and the copper foil and the lithium foil are placed into a deep cooling box to be cooled; then deep cooling rolling is performed; then folding and deep cooling rolling are performed, operation is repeated for 5-10 times, and the high-performance lamellar copper/lithium bimetal composite foil is produced; the lamellar copper/lithium bimetal composite foil is folded, and is placed into the deep cooling box to be cooled again; and then deep cooling asynchronous rolling is performed till the thickness of a rolled piece is rolled to 10-50 microns. According to the deep cooling asynchronous rolling method for preparing the lamellar copper/lithium composite foil, ultra-low temperature plastic deformation is utilized, the binding force between metal lithium and metal copper is relatively weak, and therefore it is difficult to form intermetallic compounds. In the meantime, under the condition of ultra-low temperature, the metal lithium and the metal copper both have good plasticity, and therefore multi-pass plastic deformation is achieved. An obtained material is of a nanometer lamellar composite structure, and goodbattery properties are achieved.
Description
technical field [0001] The invention belongs to the technical field of metal material rolling, in particular to a cryogenic asynchronous rolling method for preparing layered copper / lithium composite foil. Background technique [0002] At present, lithium metal, as a new energy material, has been highly valued by the world's academic and business circles, and the preparation of nano-lithium metal composite materials is also an important branch of it. For pure lithium materials, oxidation is prone to occur in heated and humid environments, which seriously threatens the performance of materials. [0003] In addition, copper foil, as a commonly used battery conductor, is widely used in the field of energy batteries. If copper foil and lithium foil are directly rolled into a layered composite material, battery materials can be prepared. However, when the composite rolling of pure lithium material and pure copper material is carried out, due to the plastic deformation during the...
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