Lithium manganate/lithium manganese iron phosphate composite positive plate and lithium ion battery
A lithium iron manganese phosphate and composite cathode technology, applied in the field of lithium ion batteries, can solve the problems of rapid battery capacity decay, excellent lithium ion diffusion speed, affecting battery life, etc., to improve electronic conductivity, improve cycle performance, and reduce high temperature. the effect of the probability of
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Embodiment 1
[0045] Example 1: Preparation of modified lithium manganese iron phosphate
[0046] (1) Add 1kg lithium manganese iron phosphate, 30g polyethylene glycol, and 1.4kg deionized water into a sand mill for sand grinding, wherein lithium iron manganese phosphate is LiMn 0.8 Fe 0.2 PO 4 , the particle size is 2.5μm, the diameter of the zirconia balls in the sand mill is 0.3mm, the mass ratio of the zirconia balls to the material is 10:1, and the speed of the sand mill is 2000r / min. After grinding for 30 minutes, a nanoscale lithium manganese iron phosphate slurry was obtained, and its particle size D was tested. 50 200nm. Then dry the lithium manganese iron phosphate slurry in a vacuum box at a drying temperature of 100° C. for 1 hour to obtain nanometer lithium manganese iron phosphate (containing a dispersant).
[0047] (2) Add 1kg LATP and 1.4kg deionized water to the sand mill for sand milling, wherein the particle size of LATP is 50 μm, the diameter of the zirconia ball in ...
Embodiment 2
[0049] Example 2: Preparation of modified lithium manganese iron phosphate
[0050] (1) Add 1 kg of lithium manganese iron phosphate, 0.01 kg of lithium aluminum titanium phosphate (LATP), 30 g of polyethylene glycol, and 3 kg of deionized water into a sand mill for sand grinding. Among them, lithium manganese iron phosphate is LiMn 0.8 Fe 0.2 PO 4 , the particle size is 2.5 μm, the particle size of LATP is 50 μm, the diameter of the zirconia balls in the sand mill is 0.3 mm, the mass ratio of zirconia balls and materials is 10:1, and the speed of the sand mill is 2000r / min. After grinding for 30 minutes, a nano-scale composite slurry is obtained, and the particle size D in the composite slurry is tested 50 250nm. Then, the composite slurry was dried in a vacuum box at a drying temperature of 100° C. and a drying time of 1 h to obtain a nanocomposite lithium manganese iron phosphate positive electrode material.
[0051] (2) Sinter 500g of nanocomposite lithium manganese i...
Embodiment 3
[0052] Example 3: Preparation of lithium manganate / lithium iron manganese phosphate composite positive electrode sheet
[0053] (1) Add 5kg spinel lithium manganate, 0.05kg sp, 0.05kg CNTs and 0.2kg PVDF into a 10L planetary mixer. Among them, lithium manganate is single crystal lithium manganate, D 50 is 10 μm. Stir for 3-5 hours, add N-methylpyrrolidone to adjust the viscosity during the stirring process, and obtain a uniform lithium manganate slurry, and control the viscosity of the slurry to 10000-12000mpa.s.
[0054] (2) Add 5kg of the modified lithium manganese iron phosphate prepared in Example 1, 0.05kg sp, 0.05kg CNTs and 0.2kg PVDF into a 10L planetary mixer, stir for 3-5 hours, and add N-methylpyrrolidone during the stirring process The viscosity is adjusted to obtain uniform lithium manganese iron phosphate slurry, and the viscosity of the slurry is controlled to be 10000-12000mpa.s.
[0055] (3) Coat the lithium manganate slurry on an aluminum foil with a thick...
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