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High-capacity nickel-cobalt-lithium manganate precursor and preparation method thereof

A nickel-cobalt-lithium-manganese-oxide, high-capacity technology, applied in the field of high-capacity nickel-cobalt-lithium manganate precursor and its preparation, can solve problems such as easy self-discharge, poor sphericity of crystal nuclei, and low tap density

Inactive Publication Date: 2015-12-02
NINGXIA ORIENT TANTALUM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional sol-gel method, spray method, high temperature solid phase method, etc. to synthesize Ni x co y mn z (OH) 2 , where (0.5≤x≤0.9, 0.05≤y≤0.2, 0.05≤z≤0.3, x+y+z=1), due to the limitation of process conditions in the preparation process, the equipment requirements are relatively strict, and industrialization is difficult. At present, the controlled crystallization hydroxide precipitation method, that is, the co-precipitation method, is widely used, but the synthesized crystal nuclei have poor sphericity, are easy to break, and have low tap density, resulting in poor cycle performance, poor stability, and easy self-discharge of the material. Small specific capacity and low safety performance under high voltage make this high-capacity material unable to be better applied

Method used

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  • High-capacity nickel-cobalt-lithium manganate precursor and preparation method thereof
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  • High-capacity nickel-cobalt-lithium manganate precursor and preparation method thereof

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preparation example Construction

[0025] The preparation method of this high-capacity nickel cobalt lithium manganese oxide precursor comprises the following steps:

[0026] (1) Select nickel, cobalt, and manganese soluble salts as raw materials, and the chemical formula of the high-capacity nickel-cobalt lithium manganate precursor prepared is Ni x co y mn z (OH) 2 , where (0.5≤x≤0.9, 0.05≤y≤0.2, 0.05≤z≤0.3, x+y+z=1) is made into a metal mixed salt solution according to the molar ratio x:y:z, and pure water is mixed with a certain mass The complexing agent and lye are mixed to form the reaction bottom liquid, and then the mixed metal salt solution, complexing agent, and lye are respectively added into the reactor with a metering pump in a molar ratio of 1.1:1:2.3 to mix and react. The reaction system adopts high and low speed control in stages. After 15 hours of reaction feed, age for 1 hour, then filter to separate solid and liquid, and then wash, first wash with pure water for 30 minutes, then wash with...

Embodiment 1

[0040] Ni 0.8 co 0.1 mn 0.1 (OH) 2 Precursor preparation:

[0041] The selected nickel-cobalt-manganese salt raw materials are nickel sulfate, cobalt sulfate, and manganese sulfate, and then a 1.5mol / L, 30°C nickel-cobalt-manganese mixed salt solution is prepared according to the molar ratio of 8:1:1. The lye is 6mol / L sodium hydroxide aqueous solution, which is used as a reaction precipitant. The complexing agent adopts 8mol / L ammonia water as the reaction complexing agent.

[0042] Before starting the kettle, add pure water, the above-mentioned ammonia water and the above-mentioned lye to the clean reaction kettle at a volume ratio of 80:1 to 2:1 to form the reaction bottom liquid, wherein the total concentration of ammonia in the reaction bottom liquid is 2.5g / L , The pH of the bottom solution is about 12.3. Submerge the stirring paddle, raise the temperature to 40°C, and stir at a speed of 100r / min.

[0043] Respectively, the previously prepared nickel-cobalt-mangan...

Embodiment 2

[0046] Ni 0.8 co 0.15 mn 0.05 (OH) 2 Precursor preparation:

[0047] The preparation of the high-capacity nickel-cobalt-lithium manganese oxide precursor uses soluble nickel-cobalt-manganese salt as the preparation raw material, the nickel salt is nickel chloride, the cobalt salt is cobalt chloride, and the manganese salt is manganese chloride. Prepare a 1.5mol / L nickel-cobalt-manganese mixed salt solution according to the molar ratio of 8:1.5:0.5. The lye (precipitating agent) adopts aqueous sodium hydroxide solution with a concentration of 6mol / L. The complexing agent adopts ammonia water, the concentration is 8mol / L.

[0048] Before starting the kettle, add pure water, ammonia water and lye to the clean reaction kettle at a volume ratio of 80:1 to 2:1 to form the reaction bottom liquid, wherein the total concentration of ammonia in the reaction bottom liquid is 2.3g / L, and the bottom The liquid pH is about 12.2. Submerge the stirring paddle, raise the temperature to ...

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Abstract

The invention relates to a positive electrode material of a lithium ion battery, especially to a high-capacity nickel-cobalt-lithium manganate precursor and a preparation method thereof. The high-capacity nickel-cobalt-lithium manganate precursor is characterized by having a chemical formula of NixCoyMnz(OH)2, wherein x is no less than 0.5 and no more than 0.9, y is no less than 0.05 and no more than 0.2, z is no less than 0.05 and no more than 0.3, and x+y+z is equal to 1. The invention provides the high-capacity nickel-cobalt-lithium manganate precursor prepared through coprecipitation and the preparation method thereof; and the prepared precursor has concentratedly distributed particle size, high tap density, good sphericility, high specific capacity, low cost, long service life, higher discharge plateau and energy density, primary 1C charge-discharge specific capacity of 195 mA.h / g and 186.5 mA.h / g, and capacity retention ratio of 95.6% after 50 cycles.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a high-capacity nickel-cobalt lithium manganate precursor and a preparation method thereof. Background technique [0002] Since 2012, portable consumer electronics such as smartphones, tablets, and power banks have sprung up. Supported by national industrial policies, electric bicycles and electric vehicles have gradually become the mainstream of consumption. In addition, lithium-ion batteries are directly used as energy storage devices for alternative energy. In the fields of aerospace, artificial satellites, small medical instruments and military communication equipment. In the emerging market of lithium-ion batteries, nickel-cobalt lithium manganese oxide cathode material has become the mainstream consumption in the lithium-ion battery market, and its application exceeds that of lithium cobalt oxide, lithium iron phosphate, and lithium manganese oxide. In the main con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 郑江峰晁锋刚赵文魏宁张晨文荣贾效旭沈立芳
Owner NINGXIA ORIENT TANTALUM IND
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