Method for improving electric conductivity of lithium iron phosphate battery anode material

A technology of lithium iron phosphate and battery positive electrode, which is applied in the field of electrochemistry and can solve problems such as controversial and uncertain

Inactive Publication Date: 2009-12-16
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The idea is very good, but it is very controversial. Whether it can be used as a method is still uncertain

Method used

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  • Method for improving electric conductivity of lithium iron phosphate battery anode material
  • Method for improving electric conductivity of lithium iron phosphate battery anode material

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Experimental program
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Effect test

Embodiment 1

[0029] Synthesis of lithium iron phosphate material

[0030] (1) Raw material preparation

[0031] Weigh respectively 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;

[0032] (2) mixed

[0033] Mix the above-mentioned materials weighed in a circular container, then add acetone, and the volume ratio of the material is 2:1, stir well until there are no bubbles, and then continue to stir for 2 hours;

[0034] (3) Ball milling

[0035] The dried above-mentioned materials are ball-milled in a common centrifugal ball mill at 500 rpm for 10 hours, and the particle diameter is less than 5 microns;

[0036] (4) dry

[0037] The ball-milled samples were dried in an ordinary oven at 108°C for 10 hours until dry;

[0038] (5) Calcination

[0039] The ball-milled material is placed in a high-temperature tube furnace, calcined at 350° C. for three hours and at 600° C....

Embodiment 2

[0042] Button battery manufacturing process,

[0043] (1) slurry preparation

[0044] Weigh lithium ferrous phosphate material: carbon black: PVDF=0.8:0.1:0.1, add lithium ferrous phosphate to an agate mortar and grind, add carbon black, mix for 10 minutes, place in an oven and bake at 78 degrees Celsius After 1 hour, add PVDF, add a certain amount of NMP, and stir for 1 hour;

[0045] (2) coating

[0046] 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 ;

[0047] (3) drying

[0048] Put the aluminum foil coated with lithium iron phosphate cathode material in a common drying oven and bake for about 10 hours to dry completely;

[0049] (4) Rolling

[0050] The dried lithium iron phosphate aluminum foil is compacted with a gap of 100 microns on t...

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Abstract

The invention belongs to the technical field of electrochemistry, and specifically discloses a method for improving electric conductivity of lithium iron phosphate battery anode material. Based on synthesizing lithium iron phosphate material by a conventional method, the method removes residual moisture in the lithium iron phosphate material by methods of injecting gas capable of dehydrating, pumping with a vacuum pump and absorbing water with phosphoric anhydride when calcining at high temperature so that the electric conductivity of the material is greatly improved. The lithium iron phosphate anode material treated by the method is used for preparing the lithium battery with the properties of high specific capacity, good safety, long cycle period and the like. The lithium/lithium ion battery prepared with the anode material is charged or discharges at a speed of 0.5C and the capacity thereof is up to 160mAh/g; the first charging/discharging effect thereof is near 100%; and the battery can be circularly charged or discharge above 100 times and substantially has no attenuate phenomenon.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a synthesis process of a positive electrode material of a lithium ion battery, in particular to a method for improving the conductivity of a lithium iron 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] With the continuous development of the economy, it is causing the depletion of oil resources, environmental pollution, and the aggravation of global warming. For this reason, human beings must grasp the balance between the "three Es" of economic growth (Economic Growth), environmental protection (Environmental Protection) and energy supply (Energy Security). The comprehensive and high-efficiency development ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58
CPCY02E60/12Y02E60/10
Inventor 王卫江
Owner FUDAN UNIV
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