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Preparation method for aluminum-coated nickel-cobalt lithium manganite and lithium battery

A technology of lithium nickel cobalt manganese oxide and nickel hydroxide lithium cobalt manganese oxide, which is applied in the field of material preparation, can solve the problems of reduced gram capacity of ternary materials, poor stability of ternary materials, and reduced electrochemical performance, so as to improve Effects of cycle stability and active material utilization, long service life, and reduction in gram capacity

Inactive Publication Date: 2018-09-28
NORTHERN ALTAIR NANOTECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, according to the traditional sintering method, the gram capacity of the ternary material is significantly reduced after secondary sintering, resulting in poor stability and reduced electrochemical performance of the ternary material.

Method used

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  • Preparation method for aluminum-coated nickel-cobalt lithium manganite and lithium battery
  • Preparation method for aluminum-coated nickel-cobalt lithium manganite and lithium battery

Examples

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preparation example Construction

[0041] The preparation method of aluminum-coated nickel-cobalt-manganese lithium manganese oxide provided in this example involves stirring and mixing the spherical or quasi-spherical nickel-cobalt-manganese hydroxide precursor and lithium hydroxide or lithium carbonate in an aqueous solution. The NETZSCH ball mill performs wet ball milling, and then produces primary particles by spray drying. The primary particles are spherical nickel cobalt manganese hydroxide, and the particle size range of spherical nickel cobalt manganese hydroxide is between 1 μm and 20 μm. After high temperature treatment at 920°C to 1050°C under air or oxygen atmosphere, and heat preservation for 12 hours to 20 hours, spherical nickel cobalt lithium manganese oxide is obtained. Then the nickel cobalt lithium manganese oxide ternary material made above and Al 2 o 3Dry ball milling with a planetary ball mill for 10 minutes to 60 minutes, then dry at a low temperature of 40°C to 80°C, and finally sinter ...

no. 1 example

[0049] 1400g of nickel hydroxide, cobalt manganese and 591.2g of lithium carbonate were added to 6000g of deionized water and stirred for 2h to 6h to obtain a uniformly mixed suspension. Pour the suspension into a Netzsch ball mill, set the speed of the ball mill to 3000r / min to 4000r / min, and the ball milling time to 3.5h to 6h. The suspension after the wet ball milling is driven into a spray drying equipment by a peristaltic pump for drying to obtain a black powder, namely spherical nickel cobalt manganese hydroxide. The obtained material (spherical nickel cobalt manganese hydroxide) is placed in an atmosphere muffle furnace for primary sintering, and the temperature is raised to 500°C at a constant 10°C / min in an air or oxygen atmosphere, and the temperature is kept constant for 5h to 10h, and then at a constant temperature of 20°C / min to raise the temperature to 950°C, keep the temperature constant for 10h to 16h, and cool naturally to obtain the nickel-cobalt-lithium-man...

no. 2 example

[0054] Add 671.1g of lithium hydroxide to 6000g of deionized water to form a lithium hydroxide aqueous solution, then add 1400g of nickel hydroxide, cobalt and manganese, and mix and stir for 2h to 6h to obtain a uniformly mixed suspension. Pour the suspension into a Netzsch ball mill, set the speed of the ball mill to 3000r / min to 4000r / min, and the ball milling time to 3.5h to 6h. The suspension after the wet ball milling is driven into a spray drying equipment by a peristaltic pump for drying to obtain a black powder, namely spherical nickel cobalt manganese hydroxide. The obtained material (spherical nickel cobalt manganese hydroxide) is placed in an atmosphere muffle furnace for primary sintering, and the temperature is raised to 500°C at a constant 10°C / min in an air or oxygen atmosphere, and the temperature is kept constant for 5h to 10h, and then at a constant temperature of 20°C / min to raise the temperature to 950°C, keep the temperature constant for 10h to 16h, and ...

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Abstract

The present invention provides a preparation method for aluminum-coated nickel-cobalt lithium manganite and a lithium battery, and relates to the technical field of material preparation methods. The method comprises the steps of wet mixing, wet ball milling, spray drying, first sintering, dry ball milling and second sintering. Aluminum oxide coats a surface of nickel-cobalt lithium manganite obtained by the first sintering through the dry ball milling. Because the dry ball milling is adopted, lithium ions are not prone to form lithium dendrites on the surface of a negative electrode. After thesecond sintering, gram volume is not greatly reduced, and material properties are enhanced to a certain degree. The preparation method for the aluminum-coated nickel-cobalt lithium manganite not onlycan enhance cyclic properties of ternary materials and improve the utilization rate of active substances, but also can obviously improve the gram volume of the materials after the second sintering. The lithium battery provided by the present invention is prepared by the above preparation method for the aluminum-coated nickel-cobalt lithium manganite, and has good electrochemical property and longservice life.

Description

technical field [0001] The invention relates to the technical field of material preparation methods, in particular to a preparation method of aluminum-coated nickel-cobalt lithium manganese oxide and a lithium battery. Background technique [0002] The ternary material combines the characteristics of three materials through the synergistic effect of Ni-Co-Mn: LiCoO 2 Good cycle performance, LiNiO 2 The high specific energy and LiMnO 2 Due to its high safety and low cost, it has become one of the most promising new cathode materials for lithium-ion batteries. [0003] However, according to the traditional sintering method, the gram capacity of the ternary material is significantly reduced after secondary sintering, resulting in poor stability and reduced electrochemical performance of the ternary material. Contents of the invention [0004] In view of the defects in the prior art, the object of the present invention includes providing a method for preparing aluminum-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 邢红霞武雪峰马书良成信刚付笑哲
Owner NORTHERN ALTAIR NANOTECH CO LTD
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