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A kind of lithium nickel cobalt manganese oxide and preparation method thereof

A lithium-nickel-cobalt-manganese and oxide technology, which is applied in the field of preparation of lithium-nickel-cobalt-manganese oxide materials, can solve the problems that it is difficult to mix the precursor and lithium salt uniformly, and the mixing process takes time, so as to achieve uniform mixing of cations and save energy , the effect of high tap density

Inactive Publication Date: 2011-11-30
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coprecipitated hydroxide or carbonate of nickel, cobalt and manganese is mechanically mixed with lithium salt and then fired at high temperature. This mixing process is time-consuming and it is difficult to mix the precursor and lithium salt evenly.

Method used

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  • A kind of lithium nickel cobalt manganese oxide and preparation method thereof
  • A kind of lithium nickel cobalt manganese oxide and preparation method thereof
  • A kind of lithium nickel cobalt manganese oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 0.11mol lithium acetate, 0.0333mol nickel acetate, 0.0333mol cobalt acetate, 0.0333mol manganese acetate are stirred and dissolved in dehydrated alcohol to obtain a concentration (sum of all cations) that is 1M (M is the concentration unit mol / L) solution (1 ). 0.21 mol of citric acid was stirred and dissolved in absolute ethanol to obtain a 2M solution (2). Slowly add solution (2) into solution (1), stir the resulting reaction mixture until a colloid is formed, then filter, put the filtered solid in an oven at 120°C, and dry for 4 hours to obtain a lithium nickel cobalt manganese oxide precursor body. The first sintering: After grinding the precursor, press the resulting material into a cylindrical shape at 2MPa, and put it into a muffle furnace to rise from room temperature to 450°C (the heating rate is 2°C / min), and keep it for 6 hours. Finish the first sintering, take out the material, grind it into fine powder, press it into a cylindrical shape under 2MPa, and pu...

Embodiment 2

[0042] Change the second sintering time to be 18 hours, and other conditions are the same as in Example 1. The obtained products were analyzed by XRD, which showed that they were all lithium nickel cobalt manganese oxides, with sharp diffraction peaks, complete and good crystal form, and α-NaFeO 2 Structure, 006 / 102, 108 / 110 peaks are obvious, and the layered structure is good. At 25°C, 2.5-4.4V voltage range, charge and discharge at 0.1C, the first discharge capacity is 192mAh / g.

Embodiment 3

[0044] Change second sintering time to be 12 hours, other conditions are the same as embodiment 1. The obtained products were analyzed by XRD, showing that they were all lithium nickel cobalt manganese oxides without any miscellaneous peaks. The diffraction peak is sharp, the crystal form is complete and good, with α-NaFeO 2 Structure, 006 / 102, 108 / 110 peaks are obvious, and the layered structure is good. At 25°C, 2.5-4.4V voltage range, charge and discharge at 0.1C, the first discharge capacity is 190mAh / g.

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Abstract

The invention discloses a lithium-nickel-cobalt-manganese oxide with excellent temperature characteristics and a high-temperature solid-phase rapid preparation method thereof. The technical problem to be solved is to improve the charge-discharge capacity and cycle performance of positive electrode materials at different operating temperatures and large rates. It mainly includes the following steps: (1) Dissolving lithium salt, nickel salt, cobalt salt, and manganese salt with a solvent; (2) Adding the solution of chelating agent into the cationic solution dropwise to form a colloid, filtering, and drying at 120°C dry to obtain a precursor of lithium nickel cobalt manganese; (3) the obtained sample is subjected to pre-calcination and final high-temperature sintering. The method has the advantages of simple process, mild conditions, easy control of process parameters, high production efficiency, low energy consumption and environmental friendliness.

Description

technical field [0001] The invention relates to a preparation method of lithium-nickel-cobalt-manganese oxide, a cathode material of a lithium-ion battery, in particular to a preparation method of a lithium-nickel-cobalt-manganese oxide material with excellent electrochemical performance and excellent temperature characteristics. Background technique [0002] As a new power source, lithium-ion battery has been put into practical use in the 1970s. Because of its advantages of high energy density, high battery voltage and long storage life, it has been widely used in various portable electronic products and power tools, especially in Electric vehicle (EV) and hybrid electric vehicle (HEV) power sources play an important role. The performance of lithium-ion batteries largely depends on the cathode material. At present, the main positive electrode materials include layered lithium cobalt oxide, layered lithium nickel oxide, spinel lithium manganese oxide, olivine type lithium i...

Claims

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Application Information

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IPC IPC(8): H01M4/1391
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 杨刚高坡
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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