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High-rate type lithium cobaltate and preparation method thereof

A lithium cobalt oxide and high rate technology, applied in the field of high rate lithium cobalt oxide and its preparation, can solve the problems of low discharge efficiency, reduced safety performance and cycle performance, and poor processing performance, and achieves a suitable particle size. , easy to implement, excellent magnification performance

Inactive Publication Date: 2014-03-19
XIAN WUHUA NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the particle size becomes larger, the discharge efficiency becomes lower under high-rate discharge; when the particle size becomes smaller, the processing performance deteriorates, and the safety performance and cycle performance will also decrease.

Method used

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  • High-rate type lithium cobaltate and preparation method thereof
  • High-rate type lithium cobaltate and preparation method thereof
  • High-rate type lithium cobaltate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, a kind of preparation method of high rate type lithium cobaltate, comprises the following steps:

[0029] (1) Add Y oxide and cobalt oxide raw materials in the organic dispersion solvent according to the Y / Co molar ratio of 0.005~0.02 to form a mixed solution, wherein Y is at least one of Mg, Al, Ti, Zr, Nb and other elements 1. Disperse the above mixed solution in a liquid dispersing device at a high speed of 1000-15000 rpm for 5-20 minutes to obtain a dispersed mixed solution. The organic dispersion solvent used in the step (1) is ethanol and acetone.

[0030] Preferably, the cobalt oxide raw material in the step (1) is spherical cobalt oxide raw material, and the average particle size (D50) is within 2-6um, preferably within 3.5-5.5um.

[0031] Disperse the above mixed liquid in a liquid dispersing equipment at a high speed of 2000rpm for 5-20min, which can fully disperse the powder in the liquid, and obtain the dispersed mixed liquid. The liquid disp...

Embodiment 2

[0036] see figure 1 , Figure 4 , embodiment 2, a kind of preparation method of high rate lithium cobaltate, comprises the following steps:

[0037] (1) Add about 200L of ethanol into a 300L sand mill as a dispersant, and add TiO at a ratio of Ti / Co of 0.01 2 and cobalt oxide, stirred for 20min.

[0038] (2) Lithium carbonate was added under the condition that the molar ratio of Li / Co was 1.01, mixed in a sand mill for 10 minutes, and then dried by vacuum drying equipment for 2 hours.

[0039] (3) Put the obtained mixture at 950°C and pass it into the air atmosphere for 145m 3 / h conditions, constant temperature sintering 14h.

[0040] (4) The sintered material was crushed and pulverized using a high-speed rotating device at 1200 rpm for 8 minutes to obtain an average particle size (D50) of 5.73 um.

[0041] Add an appropriate amount of NMP to the prepared lithium cobaltate, acetylene black, and PVDF at a mass ratio of 94:3:3, mix them evenly, and coat them on aluminum fo...

Embodiment 3

[0042] see figure 2 , Figure 4 , Embodiment 3: a kind of preparation method of lithium cobaltate of high rate, comprises the following steps:

[0043] (1) Add about 200L of ethanol into a 300L sand mill as a dispersant, and add ZrO at a ratio of Zr / Co of 0.01 2 and cobalt oxide, stirred for 20 minutes.

[0044] (2) Lithium carbonate was added under the condition that the molar ratio of Li / Co was 1.01, mixed in a sand mill for 10 minutes, and then dried by vacuum drying equipment for 2 hours.

[0045] (3) Put the obtained mixture at 950°C and pass it into the air atmosphere for 145m 3 / h conditions, constant temperature sintering 14h.

[0046] (4) The sintered material was crushed and pulverized using a high-speed rotating device at 1200 rpm for 8 minutes to obtain an average particle size (D50) of 5.73 um.

[0047] Add an appropriate amount of NMP to the prepared lithium cobaltate, acetylene black, and PVDF at a mass ratio of 94:3:3, mix them evenly, and coat them on alum...

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Abstract

The invention discloses a preparation method of high-rate type lithium cobaltate, and relates to a process method of the high-rate lithium cobaltate, which belongs to the novel energy resource material technology. The preparation method comprises the following steps: firstly, adding a cobalt material and doped substances (oxides or organic substances of Mg, Al, Ti, Zr, Nb, and the like) in proportion and uniformly dispersing in an organic dispersing solvent, adding lithium carbonate for mixing, sintering for 8 hours-20 hours after drying at a high temperature of 900DEG C-1000 DEG C under an atmosphere condition of 100m<3> / hour-200m<3> / hour; and then, carrying out pulverization treatment by a high-speed rotary device to obtain the lithium cobaltate with good rate capability. The method disclosed by the invention is simple, convenient to implement, excellent in product rate capability and low in processing cost.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and mainly relates to a high-rate lithium cobalt oxide and a preparation method thereof. Background technique [0002] Since the commercialization of lithium-ion batteries, because of their advantages such as high working voltage, high energy density, long service life, wide working temperature range, no memory effect and no pollution, they have been widely used in the fields of communication, mobile and electric tools. With the continuous expansion of the application range, the requirements for lithium-ion batteries are also constantly updated. For example, the emerging fields of car models, aircraft models, ship models, electronic cigarettes, electric vehicles, etc. are now starting to use lithium-ion batteries as a power source. These products require continuous high-current charging and discharging to meet their use needs, so the rate-type lithium-ion bat...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/62
CPCY02E60/122C01G51/42H01M4/525Y02E60/10
Inventor 周富强王广进李晖朱睿马红利王婷陈焕骏李鹤李宝正
Owner XIAN WUHUA NEW ENERGY TECH
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