A kind of preparation method of dynamic nickel cobalt lithium manganese oxide cathode material

A technology of nickel-cobalt-lithium-manganese oxide and positive electrode materials, which is applied in the direction of chemical instruments and methods, battery electrodes, nickel compounds, etc., can solve the problem of difficult to obtain stable and stoichiometric coprecipitate, low electrochemical performance stability, water body and surrounding environmental pollution, to achieve the effects of optimizing material composition distribution, avoiding hydrolysis, and large tap density

Active Publication Date: 2015-10-07
GUANGDONG BRUNP RECYCLING TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional co-precipitation method for preparing spherical nickel-cobalt lithium manganese oxide, since ammonia water or NaOH is used for precipitation in the process, NH4+, Na+ Plasma is easy to pollute the water body and the surrounding environment
And the co-precipitation method is difficult to obtain a stable co-precipitate with a fixed stoichiometric ratio in the same system due to the difference in the solubility products of the hydroxides corresponding to nickel, cobalt, and manganese.
In the conventional solid-phase method, the materials need to be pulverized and mixed before sintering, and even though they are ground for a long time before sintering, it is difficult for lithium salts, nickel salts and cobalt salts to reach uniform contact at the molecular level. The poor uniformity of the material leads to low stability of its electrochemical performance

Method used

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  • A kind of preparation method of dynamic nickel cobalt lithium manganese oxide cathode material
  • A kind of preparation method of dynamic nickel cobalt lithium manganese oxide cathode material
  • A kind of preparation method of dynamic nickel cobalt lithium manganese oxide cathode material

Examples

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Effect test

Embodiment 1

[0032] A kind of preparation method of power type lithium cobalt manganese oxide comprises the following specific steps:

[0033] (1) Add lithium acetate, nickel acetate, cobalt acetate tetrahydrate, and manganese acetate according to the mass of 6.60g, 17.68g, 124.54g, and 69.2g, respectively, into dodecanoic acid with a volume of 2.2L at 50°C to dissolve, and stir for 2h Mix well, then add 2.2 g of triethylamine dropwise while stirring, and continue to stir for 3 hours to mix well to obtain solution I;

[0034] (2) Dissolve 59.39g of lithium acetate in 0.9L of water, add 1.8g of ethylene glycol, and stir for 1 hour to obtain solution II;

[0035] (3) Pressure spray granulation of solution I on nozzle A of the double-nozzle pyrolysis furnace, control the pressure at 0.6MPa, feed rate at 5000mL / h, and at the same time, carry out solution II on nozzle B of the double-nozzle pyrolysis furnace Pressure spray granulation, the control pressure is 0.3MPa, the feed rate is 2050mL / h;...

Embodiment 2

[0038] A kind of preparation method of power type lithium cobalt manganese oxide comprises the following specific steps:

[0039] (1) Add lithium acetate, nickel acetate, cobalt acetate tetrahydrate, and manganese acetate according to the mass of 6.60g, 17.68g, 124.54g, and 69.2g into tetradecanedioic acid with a volume of 1.5L at 135°C to dissolve, and stir Mix for 2 hours, then add 3.0 g of glyoxal dropwise while stirring, and continue stirring for 3 hours to obtain solution I;

[0040] (2) Dissolve 59.39g of lithium acetate in 0.6L of water, add 2.0g of glycerol, and stir for 1 hour to obtain solution II;

[0041] (3) Pressure spray granulation of solution I on nozzle A of the double-nozzle pyrolysis furnace, control the pressure at 0.5MPa, feed rate at 4000mL / h, and at the same time, carry out solution II on nozzle B of the double-nozzle pyrolysis furnace Pressure spray granulation, the control pressure is 0.2MPa, the feed rate is 1600mL / h; there is an adjustable baffle b...

Embodiment 3

[0044] A kind of preparation method of power type lithium cobalt manganese oxide comprises the following specific steps:

[0045] (1) Add lithium oxalate, nickel oxalate, cobalt oxalate, and manganese oxalate according to the mass of 19.19g, 48.90g, 48.97g, and 47.65g to dissolve in 0.8L of hexadecanoic acid at 65°C, stir for 3 hours, and then Add 2.4 g of glutaraldehyde dropwise while stirring, and continue stirring for 2 hours to obtain solution I;

[0046] (2) Dissolve 76.78g of lithium oxalate in 0.267L of water, add 1.33g of triethanolamine, stir for 2 hours and mix well to obtain solution II;

[0047] (3) Pressure spray granulation of solution I on nozzle A of the double-nozzle pyrolysis furnace, control the pressure at 0.3MPa, and feed rate at 3000mL / h; at the same time, carry out solution II on nozzle B of the double-nozzle pyrolysis furnace Pressure spray granulation, the control pressure is 0.15MPa, the feed rate is 1000mL / h; the furnace is divided into drying secti...

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Abstract

A method for preparation of a power-type nickel cobalt manganate lithium positive electrode material; first, dissolving in an organic solvent a portion of the lithium source, nickel, cobalt, and manganese source, then dissolving in water a portion of the lithium source, while at the same time performing granulation by means of a dual-nozzle pyrolysis furnace, and mixing in the furnace; then sintering the mixed powder at high temperature to obtain the nickel cobalt manganate lithium positive electrode material. This preparation process does not produce NH4 + or Na+ ions, thus substantially mitigating pollution of the environment; the obtained nickel cobalt manganate lithium material has good sphericity and its components are uniformly distributed; tap density is high, cycling stability is excellent during the charge / discharge cycle, and specific discharge capacity at the first discharge is significantly increased.

Description

technical field [0001] The invention belongs to the technical field of battery cathode material preparation, and in particular relates to a method for preparing a dynamic nickel-cobalt lithium manganese oxide cathode material. Background technique [0002] According to my country's "Energy Saving and New Energy Automobile Industry Development Plan (2012-2020)", the cumulative sales of electric vehicles will reach 500,000 in 2015 and 5 million in 2020. Under the guidance of national policies, the power battery industry has developed rapidly. Lithium-ion batteries are considered to be one of the most promising power batteries because of their good safety, high discharge specific energy, long charge and discharge life, and no pollution. [0003] The positive electrode material directly determines the performance of lithium-ion batteries. Nickel cobalt lithium manganese oxide cathode material uses relatively cheap nickel and manganese to replace a large amount of cobalt in lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505C01G53/44H01M4/525Y02E60/122H01M10/0525C01P2004/03C01P2004/32C01P2006/11Y02E60/10
Inventor 谢英豪余海军李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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