Method for preparing nano-scale lithium ion battery anode material

A lithium-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of mechanical mixing uniformity, large reaction time and energy consumption, uneven particle size distribution, etc., to achieve excellent processing performance, reaction High biological activity and the effect of increasing tap density

Inactive Publication Date: 2010-10-20
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Example 1: Lithium nitrate, nickel nitrate, cobalt nitrate, and manganese nitrate were dissolved in deionized water respectively to form a homogeneous solution, wherein Li: Ni: Co: Mn molar ratio was 1: 0.3: 0.4: 0.3, and the above solutions were mixed After fully stirring, add urea solution twice the sum of the amount of all metal ion substances to the above mixed solution as a precipitating agent, then move it into a water bath and heat at a constant temperature of 95°C, and obtain LiNi after fully reacting. 0.3 co 0.4 mn 0.3 o 2 Precipitate the precursor, filter and wash 3 times with deionized water 3 times the volume of the precipitate, then spray-dry the suspension. The temperature of the feed port is set to 180°C, and the resulting dried precursor is sintered at 850°C in air 10 hours to get figure 1 The globular aggregate structure α-NaFeO with primary particle size on the order of nanometers shown 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 dissolved in deionized water to form a homogeneous solution, wherein Li: Ni: Co: Mn molar ratio was 1: 0.2: 0.6: 0.2, and the above solutions were mixed After fully stirring, add urea solution 3 times the sum of all metal ion substances to the above mixed solution as a precipitating agent, then move it into a water bath and heat at a constant temperature of 90°C, and obtain LiNi after fully reacting. 0.2 co 0.6 mn 0.2 o 2 The precursor is precipitated, filtered and washed twice with deionized water 5 times the volume of the precipitate, and the suspension is spray-dried. The temperature of the feed port is set to 165°C, and the dried precursor is sintered in air at 900°C In 6 hours, the globular aggregate structure α-NaFeO with primary particle size on the order of nanometers was 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 dissolved in deionized water to form a homogeneous solution, wherein Li: Ni: Co: Mn molar ratio was 1: 0.4: 0.2: 0.4, and the above solutions were mixed After fully stirring, add urea solution 3 times the sum of all metal ion substances to the above mixed solution as a precipitating agent, then move it into a water bath and heat at a constant temperature of 85°C, and obtain LiNi after fully reacting. 0.4 co 0.2 mn 0.4 o 2 Precipitate the precursor, filter and wash 5 times with deionized water 2 times the volume of the precipitate, then spray-dry the suspension. The temperature of the feed port is set to 165°C, and the resulting dried precursor is sintered in air at 750°C In 15 hours, the globular structure α-NaFeO with primary particle size in the order of nanometers was 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 nano scale 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 method for preparing LiNi, a positive electrode material for a nanoscale lithium-ion battery. x co y mn z o 2 A new method for (x+y+z=1). Background technique [0002] The layered ternary material Li-Ni-Co-Mn-O has the advantages of high specific capacity, low cost, stable cycle performance, and good safety, and can effectively make up for LiCoO 2 , LiNiO 2 , LiMnO 2 Due to their respective shortcomings, the development of ternary materials has become a research hotspot in the field of cathode materials. 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 beca...

Claims

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Application Information

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