High-temperature rate type lithium cobalt oxide anode material and preparation method thereof

A cathode material, lithium cobalt oxide technology, applied in chemical instruments and methods, battery electrodes, cobalt compounds, etc., can solve the problems of cathode material structure collapse, poor material processing performance, poor rate performance, etc., and achieve compaction performance. Good, strong thermal stability performance and chemical stability performance, low cost effect

Active Publication Date: 2016-08-03
HUNAN SHANSHAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the above technical means can achieve the effect of increasing the magnification, the crystal morphology of the synthetic material is all agglomerated particles, and the control of the tightly fused state of the morphology after the decomposition of the precursor cannot be realized, and the processing performance of the material is not good. After forming a lithium-ion battery, it is easy to cause the structure of the positive electrode material to collapse in a high temperature environment, resulting in poor rate performance

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  • High-temperature rate type lithium cobalt oxide anode material and preparation method thereof
  • High-temperature rate type lithium cobalt oxide anode material and preparation method thereof
  • High-temperature rate type lithium cobalt oxide anode material and preparation method thereof

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Embodiment 1

[0039] A high-temperature rate type lithium cobaltate positive electrode material of the present invention is formed by lithium cobaltate doped with metal element Al, and its molecular formula is LiCo 0.998 Al 0.002 o 2 , its preparation method comprises the following steps:

[0040] (1) Dissolve CoCl with deionized water 2 、Al 2 (SO 4 ) 3 , prepared into an aqueous solution with a molar ratio of Co:Al=100:0.2 and a Co ion concentration of 1.25mol / L, and the obtained aqueous solution and NH 4 HCO 3 Add the solution into the reaction kettle to make it react and crystallize, and stir at the same time, and control the pH value of the reaction system to 7.0-8.0, the flow rate is 500L / h, the stirring speed is 50rpm, the crystallization temperature is 20°C, and the continuous reaction repeats crystallization for 4 Centrifugal filtration is carried out after the times to obtain the precursor cobalt salt doped with metal element Al;

[0041] (2) Decompose the precursor cobalt ...

Embodiment 2

[0046] A high-temperature rate type lithium cobaltate positive electrode material of the present invention is formed by lithium cobaltate doped with metal element Al, and its molecular formula is Li 1.05 co 0.9965 Al 0.0035 o 2 , its preparation method comprises the following steps:

[0047] (1) Dissolve CoCl with deionized water 2 、Al 2 (SO 4 ) 3 , prepared into an aqueous solution with a molar ratio of Co:Al=100:0.3 and a Co ion concentration of 1.25mol / L, and the obtained aqueous solution and NH 4 HCO 3 Add the solution into the reaction kettle to make it react and crystallize, while stirring, and control the pH value of the reaction system to 7.0-8.0, the flow rate is 1000L / h, the stirring speed is 120rpm, the crystallization temperature is 50°C, and the continuous reaction repeats crystallization for 6 Centrifugal filtration is carried out after the times to obtain the precursor cobalt salt doped with metal element Al;

[0048] (2) Decompose the precursor cobalt ...

Embodiment 3

[0053] A high-temperature rate type lithium cobaltate positive electrode material of the present invention is formed by lithium cobaltate doped with metal element Al, and its molecular formula is Li 1.10 co 0.995 Al 0.005 o 2 , its preparation method comprises the following steps:

[0054] (1) Dissolve CoCl with deionized water 2 、Al 2 (SO 4 ) 3 , prepared into an aqueous solution with a molar ratio of Co:Al=100:0.4 and a Co ion concentration of 1.25mol / L, and the obtained aqueous solution was mixed with (NH 4 ) 2 CO 3 Add the solution into the reaction kettle to make it react and crystallize, and stir at the same time, and control the pH of the reaction system to be 7.0-8.0, the flow rate is 2000L / h, the stirring speed is 200rpm, the crystallization temperature is 80°C, and the continuous reaction repeats crystallization for 8 Centrifugal filtration is carried out after the times to obtain the precursor cobalt salt doped with metal element Al;

[0055] (2) Decompose...

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Abstract

The invention discloses a high-temperature rate type lithium cobalt oxide anode material .The anode material is formed by doping lithium cobalt oxide with metallic elements M .The molecular formula of the anode material is LirCo(1-x)MxO2, wherein 1.00<=1<=1.10, 0.002<=x<=0.005, and the metallic elements M include at least one of Al, Y and Mg .The surface morphology of the lithium cobalt oxide anode material is in a highly agglomerated state that primary particles are closely fused, particle distribution is uniform, fluidity is good, the compaction performance is good, and the rate performance can be improved; the morphology is well kept in the finished lithium cobalt oxide anode material according to the characteristic that the metal elements are uniformly distributed, so that the structural stability of lithium cobalt oxide in the charging and discharging process is improved, the rate discharge performance is improved, the material can adapt to an environment at higher temperature, and therefore the lithium cobalt oxide anode material can have good rate performance in both a normal temperature environment and the high-temperature environment .The invention further provides a preparation method of the high-temperature rate type lithium cobalt oxide anode material .By means of the method, steps are simple and easy to implement, operation is convenient, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-temperature rate type lithium cobalt oxide cathode material and a preparation method thereof. Background technique [0002] Lithium cobalt oxide currently has the highest market share in the cathode material market, and is widely used in 3C digital (electronic products such as mobile phones, notebook computers, mobile power supplies), electronic cigarettes, and drones. The market demand for lithium cobalt oxide is mainly high-voltage energy density type and rate type. The application of 4.4V high-voltage energy density type lithium cobalt oxide materials in lithium-ion batteries has become mature. With the increasing popularity of short-time high-current discharge electronic products such as drones used for aerial photography, not only lithium cobalt oxide is required to have excellent rate performance at room temperature, but also rate-type LiCoO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/1391C01G51/00
CPCC01G51/40H01M4/1391H01M4/525Y02E60/10
Inventor 胡旭尧李永昌蒋湘康李旭谭欣欣
Owner HUNAN SHANSHAN ENERGY TECH CO LTD
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