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Preparation method of nickel cobalt lithium manganate composite cathode material

A composite positive electrode material, nickel-cobalt-lithium manganese oxide technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of increasing safety hazards, unfavorable cycle performance and safety performance, increasing the cost of ternary material preparation, etc. , to achieve the effect of improving cycle performance, improving safety performance and increasing packing density

Inactive Publication Date: 2014-12-10
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Such as Chinese patent CN102891310A disclosed titanium-silicon-carbon-modified lithium-ion battery ternary positive electrode material and its preparation method is by adopting alcohol suspension method in LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Adding highly conductive Ti to the matrix 3 SiC 2 , this technology mainly improves the conductivity of ternary materials, but this technology uses alcohol in the preparation, which increases the preparation cost of ternary materials, and also increases the safety hazard in production
Chinese patent CN101707252B discloses a polycrystalline nickel-cobalt-manganese ternary positive electrode material and its preparation method. The preparation method mainly adopts high-temperature fusion to prepare polycrystalline cobalt-nickel-manganese ternary positive electrode material, but does not introduce any The binding agent of the polycrystalline material cannot guarantee the fusion effect of the polycrystalline material, and there is no coating layer on the surface of the material, which cannot block the reaction between the material and the electrolyte, which is not conducive to improving the cycle performance and safety performance of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 90g of prepared nickel-cobalt lithium manganese oxide doped with metal ions as the matrix, take 10g of fine powder produced in the production process of lithium manganate as the coating material, take 0.5g of boric acid as the binder, and use a horizontal ball mill to mix evenly to get the mixture. The mixture was put into a muffle furnace and sintered in an air atmosphere. The temperature was raised to 600°C for 6 hours, then the temperature was raised to 900°C for 15 hours, and then cooled naturally. A universal pulverizer is used to pulverize and sieve the material to obtain a nickel-cobalt-lithium manganate composite cathode material.

[0014] The tap density of the powder tested by a tap density meter is 2.58g / cm3.

[0015] The electrochemical performance test of the material is tested by a battery test system at room temperature (25°C), and the test voltage range is 2.5 to 4.3V; the rate performance test conditions: 0.1C charge and discharge once (battery ac...

Embodiment 2

[0017] Take the prepared 1800g of nickel-cobalt lithium manganese oxide as the substrate, take 20g of the fine powder produced in the production process of lithium manganate as the coating material, take 60g of barium oxide as the binder, and use a high-speed mixer to mix evenly to obtain a mixture. The mixture was put into a muffle furnace and sintered in an oxygen atmosphere. The temperature was raised to 700°C for 5 hours, then the temperature was raised to 1000°C for 10 hours, and then cooled naturally. A horizontal ball mill is used to pulverize and sieve the material to obtain a nickel-cobalt-lithium manganate composite cathode material.

Embodiment 3

[0019] Take the prepared 700g of nickel-cobalt lithium manganate doped with metal ions as the substrate, take the fine powder produced in the production process of 300g of lithium manganate as the coating material, take 20g of lithium dihydrogen phosphate and 30g of tungsten oxide as the binding agent, Use a horizontal ball mill to mix evenly to obtain a mixture. The mixture was put into a muffle furnace and sintered in an oxygen atmosphere. The temperature was raised to 350°C for 6 hours, then the temperature was raised to 800°C for 20 hours, and then cooled naturally. A universal pulverizer is used to pulverize and sieve the material to obtain a nickel-cobalt-lithium manganate composite cathode material.

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Abstract

The invention relates to the technical field of lithium-ion battery anode materials and in particular relates to a preparation method of a nickel cobalt lithium manganate composite anode material. By utilizing the preparation method, recycling of lithium manganate fine powder is realized, the safety performance of the material can be improved by adding the lithium manganate into ternary material, frit reaction among particles is strengthened by adding a binding agent so that the lithium manganate fine powder is tightly coated on the surface of the ternary particles so as to improve product stacking density, and side reaction between the material and electrolyte can be obstructed by the binding agent remained on the surface of the nickel cobalt lithium manganate composite anode material after high-temperature fusion so as to improve the cycle performance of the material and further improve the safety performance of the material. Compared with the prior art, by utilizing the composite anode material, energy density of nickel cobalt lithium manganate is kept and the safety performance is improved. The composite anode material is one of optimal anode materials applied to power batteries of electromobiles, electric power tools and the like.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium-ion power batteries, in particular to a preparation method of a nickel-cobalt lithium manganate composite positive electrode material. Background technique [0002] At present, a large number of positive electrode materials used in power batteries on the market are mainly lithium iron phosphate and lithium manganese oxide. Due to the excellent safety performance of lithium iron phosphate, it is the preferred positive electrode material for power batteries such as electric buses; lithium manganese oxide has the advantages of good rate performance in addition to good safety performance, and is mainly used in electric bicycles and small electric tools. battery. With the development of power batteries used in electric vehicles, due to the low energy density of lithium iron phosphate and lithium manganese oxide, they cannot meet their requirements. The nickel-cobalt li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 孙琦李岩孙慧英
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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