Lithium battery pole piece, preparation method thereof, and lithium battery
A lithium battery and pole piece technology, applied in the field of lithium battery pole piece and its preparation, can solve the problems of less electrolyte diffusion channels, poor electronic conductivity, affecting battery rate performance and cycle performance, etc., to achieve good rate performance and Cycle performance and the effect of improving battery energy density
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specific Embodiment approach 1
[0027] A lithium battery pole piece, comprising a metal framework 2 and an active material 1, the metal framework 2 has an open structure, the active material 1 is embedded in the open structure of the metal framework 2, the metal framework 2 and the active material There is a gap 3 between 1.
[0028] Specifically, the metal skeleton 2 is made of metal materials to form a continuous integral structure, while ensuring that the structure of the metal skeleton 2 is open. The internal space of the open skeleton structure is connected with the outside world, and the closed skeleton structure corresponds to the open skeleton structure, and the internal space of the closed skeleton structure is just completely isolated by the skeleton structure.
[0029] Specifically, the metal skeleton 2 forms good contact with the active material 1 particles and forms a certain restraint stress on the active material 1 particles, but the metal skeleton 2 does not completely wrap the active materia...
Embodiment 1
[0043]First dissolve PVDF in NMP to prepare a 0.1% solution, then add metal aluminum powder and commercially purchased lithium cobaltate positive electrode active material powder into the solution and stir, mix into a uniform slurry and coat it into a film, then dry solvent to obtain a diaphragm with a thickness of 10mm, wherein the average particle size of the metal aluminum powder is 1 μm, the mass fraction of the metal aluminum powder accounts for 5%, and the mass fraction of PVDF accounts for 0.1%; It is a rectangular sheet of 10 mm; in an inert gas argon atmosphere, the membrane is calcined at 600°C for 0.5h to remove PVDF, and then the temperature is raised to 660°C and kept for 1 second to obtain a lithium cobaltate positive electrode sheet.
[0044] First dissolve CMC in water to prepare a 30% solution, then add metal copper powder and commercially purchased graphite anode material powder into the solution and stir, mix into a uniform slurry and coat it into a film, dry...
Embodiment 2
[0051] First, PEG and PEO are dissolved in acetonitrile at a mass ratio of 1:1 to prepare a 99.9% solution, then metal iron powder and commercially purchased lithium iron phosphate cathode material powder are added to the solution and stirred to form a uniform slurry The material is coated and formed into a film, and the solvent is dried to obtain a film with a thickness of 0.05 mm. The average particle size of the metal iron powder is 0.1 μm, the mass fraction of the metal iron powder accounts for 10%, and the total mass fraction of PEG and PEO accounts for 2 %; then cut the membrane into a rectangular sheet with a length of 69 mm, a width of 45 mm, and a thickness of 0.05 mm; in a nitrogen atmosphere, the membrane was calcined at 500 °C for 1 h to remove PEG and PEO, and then the temperature was raised to 1538 °C. Hold for 0.1 second to obtain a lithium iron phosphate positive electrode sheet.
[0052] First dissolve PVP in ethanol to prepare a 5% solution, then add metal ni...
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