Cell positive electrode and lithium ion cell adapting said positive electrode and preparing method
A technology for lithium-ion batteries and positive pole pieces, which is applied in the field of lithium-ion batteries and their preparation, can solve the problems of low-temperature discharge performance and poor rate performance, and achieve the effect of improving conductivity and good high-temperature performance
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preparation example Construction
[0019]The preparation method of the positive electrode sheet can adopt a conventional preparation method. For example, the positive electrode sheet can be obtained by mixing the positive electrode active material, conductive agent and binder with a solvent, coating and / or filling it on the current collector, drying, and compression molding or not. . Wherein, the solvent can be selected from N-methylpyrrolidone (NMP), dimethylformamide (DMF), diethylformamide (DEF), dimethylsulfoxide (DMSO), tetrahydrofuran (THF) and One or more of water and alcohols. The amount of the solvent can make the paste have viscosity and fluidity, and can be coated on the current collector. Generally, based on the weight of the positive electrode active material, the content of the solvent is 5-70 wt%, preferably 15-50 wt%. Wherein, the methods and conditions of drying and compression molding are well known to those skilled in the art. The positive electrode current collector can be a conventional...
Embodiment 1
[0037] This example illustrates the positive electrode material provided by the present invention, the lithium ion battery containing the positive electrode material and their preparation methods.
[0038] (1) Preparation of positive electrode
[0039] 100 g of positive active ingredient LiMnO 2 , 4 grams of PVDF as an adhesive, and 4 grams of conductive agent acetylene black were added to 40 grams of NMP, and then stirred in a vacuum mixer to form a uniform positive electrode slurry.
[0040] The slurry is evenly coated on aluminum foil, then dried at 150°C, rolled, and cut to obtain a positive electrode sheet with a size of 540×43.5 mm, which contains 4.2 grams of active ingredient LiMnO 2 .
[0041] Place the pole piece in 1 liter of electroless plating solution (sodium citrate (C 6 h 5 Na 3 o 7 .2H 2 O) 0.15 moles, nickel sulfate (NiSO 4 .6H 2 O) 0.2 moles, sodium hypophosphite (NaH 2 PO 2 .H 2 (0) 0.5 mole, potassium hydrogen phthalate+sodium hydroxide 0.1 mol...
Embodiment 2
[0049] This example illustrates the positive electrode material provided by the present invention, the lithium ion battery containing the positive electrode material and their preparation methods.
[0050] (1) Preparation of positive electrode
[0051] 100 g of positive active ingredient LiMnO 2 2. Add 2 grams of PVDF adhesive and 8 grams of conductive agent acetylene black to 20 grams of NMP, and then stir in a vacuum mixer to form a uniform positive electrode slurry.
[0052] The slurry is evenly coated on aluminum foil, then dried at 150°C, rolled, and cut to obtain a positive electrode sheet with a size of 540×43.5 mm, which contains 4.15 grams of positive active ingredient LiMnO 2 .
[0053] Place the pole piece in 1 liter of electroless plating solution (0.1 mole of citric acid, nickel sulfate (NiSO 4 .6H 2 O) 0.12 moles, sodium hypophosphite (NaH 2 PO 2 .H 2 (0) 0.35 moles, potassium hydrogen phthalate+hydrochloric acid 0.15 moles, thiourea 2.5 grams), wherein th...
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Abstract
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