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Method for modifying positive electrode of lithium ion battery by adding metal oxide/carbon composite material

A lithium-ion battery, carbon composite material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of expensive equipment, high deposition modification cost, unfavorable cycle performance, etc., and achieve the effect of simple operation

Active Publication Date: 2016-03-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to avoid the long-term contact between the coated positive electrode material and the air during the operation of the solution method, which will cause water vapor and carbon dioxide in the air to react with the lithium-containing positive electrode material and generate lithium carbonate on the surface of the material, which is not conducive to the improvement of cycle performance. Improve; while the atomic layer deposition method has the disadvantages of expensive equipment and high cost of deposition modification

Method used

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  • Method for modifying positive electrode of lithium ion battery by adding metal oxide/carbon composite material
  • Method for modifying positive electrode of lithium ion battery by adding metal oxide/carbon composite material
  • Method for modifying positive electrode of lithium ion battery by adding metal oxide/carbon composite material

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Embodiment 1

[0035] (1) Weigh 1.496g of conductive carbon black as a carrier of conductive carbon material, mix it with surfactant sodium lignosulfonate in deionized water at a mass ratio of 1:5, ultrasonicate for 1 hour, then filter and wash, after washing, remove the precipitate Add it to 250mL of ruthenium trichloride solution with a concentration of 0.005M, sonicate for 1h, then heat to boiling and stir for 6h, so that the loading precursor is loaded on the surface of the carrier and completely hydrolyzed, then filtered and washed, and dried at 50°C for 5h After drying, a ruthenium oxide / carbon black electrode additive with a ruthenium oxide loading of 10wt% can be obtained through heat treatment at 250° C. for 10 hours;

[0036] (2) Weigh according to the mass ratio of the amount of positive electrode active material, the amount of electrode additives, the amount of N-methylpyrrolidone (NMP) added, and the amount of polyvinylidene fluoride (PVDF) added: 75:5:10:10 A certain amount of ...

Embodiment 2

[0038] (1) Weigh 0.814g of the conductive carbon material carrier graphene, mix it with the surfactant triethanolamine lauryl sulfate in deionized water at a mass ratio of 1:5, ultrasonicate for 1h, then filter and wash, after washing, add the precipitate to Add 250mL of zinc dichloride solution with a concentration of 0.010M, ultrasonically treat for 1h, then add 300mL of aqueous sodium hydroxide solution with a concentration of 0.010M and stir for 6 hours, then filter and wash, dry at 50°C for 5h, and then A zinc oxide / graphene additive with a zinc oxide load of 20wt% can be prepared by heat treatment at 250°C for 10 hours;

[0039] (2) Take a certain amount of positive electrode active material Li (Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 , electrode additives, NMP, PVDF, Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 Mix with electrode additives and grind for 1 hour, then add NMP, stir for 1 hour, then add binder PVDF, stir for 8 hours to obtain a uniform slurry, use a scraper to evenly coat the sl...

Embodiment 3

[0041] (1) Weigh 0.599g of conductive carbon material carrier carbon nanotubes, mix them with surfactant sodium dodecylsulfonate in deionized water according to a mass ratio of 1:5, ultrasonically treat for 1h, then filter and wash, after washing, Add the precipitate to 250 mL of titanium isopropoxide solution with a concentration of 0.02M, sonicate for 1 h, then add 25 mL of deionized water and stir for 6 h, so that the titanium isopropoxide is completely hydrolyzed and loaded onto the surface of the carrier, then filtered and washed, and then washed at 50 After drying for 5 hours at ℃, heat treatment at 250 ℃ for 10 hours can produce a titanium dioxide / carbon nanotube electrode additive with a loading capacity of titanium dioxide of 40 wt%.

[0042] (2) Weigh a certain amount of positive electrode active material LiNi according to the mass ratio of the amount of positive electrode active material, the amount of electrode additives, the amount of NMP added, and the amount of P...

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Abstract

The invention discloses a method for modifying a positive electrode of a lithium ion battery by adding a metal oxide / carbon composite material, and belongs to the technical field of secondary lithium ion batteries. The modification method comprises: mechanically mixing a positive electrode active material of the lithium ion battery with an electrode additive, wherein the electrode additive is the composite material and consists of two parts of a conductive carbon material carrier and a metal oxide load. The electrode additive can reduce the rate of increment of impedance of the positive electrode of the lithium ion battery along with charging / discharging cycle, thereby achieving the purpose of improving the cycle performance of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion secondary batteries, and relates to a method for modifying the positive electrode of the lithium-ion battery to improve the service life of the lithium-ion battery, in particular to a method for modifying the positive electrode of the lithium-ion battery by adding a metal oxide / carbon composite material. Background technique [0002] Due to the advantages of high voltage, large specific energy, small self-discharge and light weight, lithium-ion batteries have been widely used in notebook computers, mobile phones, wearable devices, electric vehicles and other fields. However, the capacity of lithium-ion batteries will gradually decay during the charge-discharge cycle, shortening their service life. With the rapid development of its application fields, the performance requirements for lithium-ion batteries are also increasing, so the problem of its cycle performance needs to be solved urgently. ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/139
CPCH01M4/139H01M4/62H01M4/625Y02E60/10
Inventor 方海涛洪达王亚杰
Owner HARBIN INST OF TECH
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