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Method for preparing nano-scale lithium ion battery anode material

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of mechanical mixing uniformity, uneven particle size distribution, large reaction time and energy consumption, and achieves excellent processing performance. The effect of high tap density and reactant activity

Inactive Publication Date: 2012-10-24
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current process route for synthesizing the ternary system is to use a high-temperature solid-phase method, which is refined and mixed by mechanical means and then sintered at a high temperature to obtain this type of positive electrode material. The high-temperature solid-phase method is the most widely used in the field of material preparation because of its simple equipment and process, and is easy to industrialize. Extensive, but the mechanical mixing uniformity is limited, which is not conducive to the uniform mixing of effective elements. During the sintering process, a solid solution with uniform properties is formed, which affects the performance of the material. The particle size distribution is not concentrated, and impurities are easily introduced during the mechanical refinement and mixing process. Full diffusion requires high reaction temperature and long reaction time, which consumes a lot of energy

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  • Method for preparing nano-scale lithium ion battery anode material

Examples

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Effect test

Embodiment 1

[0016] Example 1: Lithium nitrate, nickel nitrate, cobalt nitrate, and manganese nitrate were respectively dissolved in deionized water to form a homogeneous solution, wherein the molar ratio of Li:Ni:Co:Mn was 1:0.3:0.4:0.3, and the above solutions were mixed After fully stirring, add 2 times the total amount of all metal ion substances to the above mixed solution of urea solution as a precipitant, then move it into a water bath and heat at a constant temperature of 95°C. After full reaction, LiNi is obtained. 0.3 Co 0.4 Mn 0.3 O 2 The precursor precipitated, filtered and washed with deionized water 3 times the volume of the precipitate for 3 times, and the suspension was spray-dried. The inlet temperature was set to 180°C, and the resulting dried precursor was sintered at 850°C in air Get it in 10 hours figure 1 The spherical aggregate structure α-NaFeO with the primary particle size shown in the nanometer order 2 Type LiNi 0.3 Co 0.4 Mn 0.3 O 2 Cathode material.

Embodiment 2

[0017] Example 2: Lithium nitrate, nickel acetate, cobalt oxalate, and manganese nitrate were respectively dissolved in deionized water to form a homogeneous solution, where the molar ratio of Li:Ni:Co:Mn was 1:0.2:0.6:0.2, and the above solutions were mixed After fully stirring, add 3 times the total amount of all metal ion substances to the above mixed solution as a precipitant urea solution, then move it into a water bath and heat at a constant temperature of 90°C. After full reaction, LiNi is obtained. 0.2 Co 0.6 Mn 0.2 O 2 The precursor precipitates. After filtration, it is washed twice with deionized water 5 times the volume of the precipitate, and the suspension is spray-dried. The inlet temperature is set to 165°C. The resulting dried precursor is sintered at 900°C in the air Within 6 hours, a spherical aggregate structure α-NaFeO with a particle size of nanometers can be obtained 2 Type LiNi 0.3 Co 0.4 Mn 0.3 O 2 Cathode material.

Embodiment 3

[0018] Example 3: Lithium nitrate, nickel sulfate, cobalt oxalate, and manganese nitrate were respectively dissolved in deionized water to form a homogeneous solution, where the molar ratio of Li:Ni:Co:Mn was 1:0.4:0.2:0.4, and the above solutions were mixed After fully stirring, add 3 times the total amount of all metal ion substances to the above mixed solution as a precipitant urea solution, then move it into a water bath and heat at a constant temperature of 85°C. After full reaction, LiNi is obtained. 0.4 Co 0.2 Mn 0.4 O 2 The precursor precipitates, filtered and washed with deionized water twice the volume of the precipitate for 5 times, and the suspension is spray-dried. The inlet temperature is set to 165°C. The resulting dried precursor is sintered in the air at 750°C Within 15 hours, a spherical aggregate structure α-NaFeO with a particle size of nanometers can be obtained 2 Type LiNi 0.4 Co 0.2 Mn 0.4 O 2 Cathode material.

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Abstract

The invention discloses a method for preparing a nano-scale lithium ion battery anode material. The anode material is LiNixCoyMnzO2(x+y+z=1). The method comprises: dissolving compounds which contain Li, Ni, Co and Mn elements in deionized water, fully mixing the mixture to obtain uniform mixed solution, adding solution of precipitator into the mixed solution, transferring the mixed solution into a water / oil bath pot to heat the mixed solution to perform a reaction fully to obtain a LiNixCoyMnzO2(x+y+z=1) precipitate, filtering the reaction solution, washing the precipitate, drying the precipitate by spraying, and sintering the precipitate in the air at a high temperature to obtain the LiNixCoyMnzO2(x+y+z=1) anode material of which the primary particle size is of nano scale. In the invention, the LiNixCoyMnzO2(x+y+z=1) anode material for alpha-NaFeO2 type lithium ion batteries, of which the primary particles have a nano spherical polymer structure, is prepared by combining co-precipitation and spray drying, the active ingredients are mixed uniformly, the activities of the reactants are high, the reaction time and reaction temperature are reduced, the obtained product is of the nanoscale and the particle size distribution of the product is uniform.

Description

Technical field [0001] The invention belongs to the field of energy material preparation technology, and relates to a preparation of LiNi, a cathode material for nano-level lithium ion batteries x Co y Mn z O 2 (x+y+z=1) new method. Background technique [0002] The layered ternary material Li-Ni-Co-Mn-O has the advantages of high specific capacity, low cost, stable cycle performance, good safety, etc., and can effectively make up for LiCoO 2 , LiNiO 2 , LiMnO 2 Due to their respective deficiencies, the development of ternary materials has become a research focus in the field of cathode materials. The current process route for synthesizing the ternary system is to adopt the high-temperature solid phase method. This type of cathode material is obtained through high-temperature sintering after fine mixing by mechanical means. The high-temperature solid phase method is easy to industrialize and is most applied in the field of material preparation due to its simple equipment and proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 赵金鑫
Owner IRICO