Method for improving conductivity of pure lithium iron phosphate anode material
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A technology of pure lithium iron phosphate and high lithium iron phosphate, applied in the field of electrochemistry, can solve uncertain and controversial problems
Inactive Publication Date: 2014-03-26
FUDAN UNIV
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Embodiment １
[0031] Synthesis of lithium iron phosphate material
[0032] (1) Raw material preparation
[0033] Weigh 114g (99.9%) of industrial battery grade ferrous oxalate, 73g (99.5%) of ammonium dihydrogen phosphate, and 24g (99.9%) of industrial battery grade lithium carbonate;
[0034] (2) mixed
[0035] Mix the above-mentioned materials weighed in a circular container, then add acetone, the volume ratio to the material is 2:1, fully stir until there are no bubbles, and then continue to stir for 2 hours;
[0036] (3) Ball milling
[0037] Mill the above-mentioned materials after drying in an ordinary centrifugal ball mill at 500 rpm for 10 hours, and the particle diameter is less than 5 microns;
[0038] (4) dry
[0039] The ball-milled sample was baked at 108oC for 10 hours in a common oven until dry;
[0040] (5) Calcination
[0041] The ball-milled material is placed in a high-temperature tube furnace, and calcined at 350oC for three hours and at 600oC for six hours in an...
Embodiment 2
[0045] Button battery manufacturing process,
[0046] (1) Slurry preparation
[0047]Weigh lithium ferrous phosphate material: PVDF=0.975::0.025, add lithium ferrous phosphate in an agate mortar and grind for 10 minutes, then bake in an oven at 78 degrees Celsius for 1 hour, add PVDF, and add a certain amount of NMP After that, stir for 1 hour;
[0048] (2) Coating
[0049] Put the 20 micron thick aluminum foil for lithium-ion batteries on the smooth surface of the coating machine, then flatten it, pour the slurry into the coating machine for coating, ensure that the slurry is evenly distributed on the aluminum foil, and the thickness is 200 microns ;
[0050] (3) drying
[0051] Put the aluminum foil coated with lithium iron phosphate cathode material in an ordinary drying oven and bake it for about 10 hours to dry completely; (4) Rolling
[0052] The dried lithium iron phosphate aluminum foil is compacted with a gap of 100 microns on the roller machine, and the total th...
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Abstract
The invention belongs to the technical field of electrochemistry, and in particular relates to a method for improving conductivity of a pure lithium iron phosphate anode material. According to the method, on the basis that the pure lithium iron phosphate anode material generally without conductivity is synthesized by using an ordinary method, a material with carbon-carbon and carbon-oxygen unsaturated bands is gasified by using a preset inert gas in a calcinator, subsequently the calcinator is cleaned at room temperature, and furthermore pure lithium iron phosphate is put into the calcinator to be subjected to inert gas calcination, so that the conductivity of the material is greatly improved. The conductivity of the material is increased to 1/10 siemens per centimeter from 1 ppb siemens per centimeter, or in other words, the resistance is reduced to be 10 Ohm from 1 billion Ohm. The residual carbon content of the lithium iron phosphate anode material treated by using the method is 0.3%, and the residual carbon content before the treatment is 0.2%. The method is used for preparing lithium ion batteries, a high capacity ratio can be obtained without adding conductive carbon, and the characteristics of excellent security property, long circulation period and the like can be achieved.
Description
technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a method for synthesizing a positive electrode material of a lithium ion battery, in particular to a method for improving the conductivity of a pure lithium ferrous phosphate positive electrode material. The material prepared by the method is used to prepare the lithium ion battery and has the characteristics of high specific capacity, excellent safety performance, slow charging and discharging platform, long cycle period and the like. Background technique [0002] In order to solve problems such as the depletion of petroleum resources, environmental pollution, and global warming, people around the world have been actively developing lithium-ion battery materials in recent decades. Lithium cobalt oxide (LiCoO 2 ) and carbon materials have been successfully commercialized as positive and negative electrode materials for lithium ions, as well as lithium mangan...
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