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Method for producing anode active material precursor for sodium secondary battery by using coprecipitation technique and anode active material precursor for sodium secondary battery produced thereby

A positive electrode active material, sodium secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of large amount of impurities, long production time, high production temperature, etc., and achieve the effect of improving life characteristics

Active Publication Date: 2015-09-02
IUCF HYU (IND UNIV COOP FOUNDATION HANYANG UNIV)
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the solid-state reaction method has the following disadvantages: it is difficult to form a solid solution (solid solution) between solid states, and the amount of impurities introduced when mixing is large; it is difficult to control a certain particle size; and high production temperature and long production time are required
However, in order to prepare a positive electrode active material for a sodium secondary battery, a solid-state reaction method is mainly used in existing methods, and research on a method for preparing a positive electrode active material for a sodium secondary battery using a co-precipitation method has not been conducted.

Method used

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  • Method for producing anode active material precursor for sodium secondary battery by using coprecipitation technique and anode active material precursor for sodium secondary battery produced thereby
  • Method for producing anode active material precursor for sodium secondary battery by using coprecipitation technique and anode active material precursor for sodium secondary battery produced thereby
  • Method for producing anode active material precursor for sodium secondary battery by using coprecipitation technique and anode active material precursor for sodium secondary battery produced thereby

Examples

Experimental program
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Effect test

Embodiment 5 to 12

[0051] Repeat the operation of Example 1, the difference is that use ammonia solution to adjust the internal pH value of the reactor at 7 as the first pH regulator, and use 0.5M ammonium oxalate aqueous solution to adjust the internal pH value of the reactor at 7 as the second pH regulator. 7. To prepare the precursors of Examples 5 to 12, the composition of which is shown in Table 1 above.

Embodiment 13 and Embodiment 14

[0057] Repeat the operation of Example 1, the difference is that use ammonia solution to adjust the internal pH value of the reactor at 7 as the first pH regulator, and add 4M NaOH to adjust the internal pH value of the reactor at 9.2 as the second pH regulator, To prepare the precursors of embodiment 13 and embodiment 14, they are respectively made of (Ni 0.25 Fe 0.5 mn 0.25 ) 3 o 4 and (Ni 0.25 Fe 0.25 mn 0.5 ) 3 o 4 express.

preparation example

[0069] Preparation of battery

[0070] Mixed metal oxide, acetylene black (Denki Kagaku Kogyo Co., Ltd.) as a conductive material, and PVDF (Kureha Co., Ltd., Polyvinylidene DiFluoride Polyflon) as a binder were weighed separately. , so that it becomes a composition of composite metal oxide:conductive material:binder=85:10:5 (weight ratio).

[0071] Thereafter, first, the mixed metal oxide and acetylene black were thoroughly mixed with an agate mortar, and an appropriate amount of N-methyl-2-pyrrolidone (NMP: manufactured by Tokyo Chemical Industry Co., Ltd.) was added to the mixture, and further Add PVDF and continue mixing to make a homogeneous slurry. The obtained slurry was applied to a thickness of 100 μm on an aluminum foil having a thickness of 40 μm as a current collector using an applicator, put into a dryer, and dried sufficiently while removing NMP to obtain a positive electrode sheet. The positive electrode sheet was punched with an electrode punching machine to ...

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Abstract

The present invention relates to a method for producing an anode active material precursor for a sodium secondary battery by using a coprecipitation technique and an anode active material precursor for a sodium secondary battery produced thereby. The method for producing an anode active material precursor for a sodium secondary battery by using a coprecipitation technique according to the present invention can provide an anode active material precursor, having improved lifespan characteristics and a new composition, for a sodium secondary battery by aptly adjusting the types of complexing agents and pH values while using a coprecipitation technique.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode active material precursor for a sodium secondary battery using a co-precipitation method and the positive electrode active material precursor for a sodium secondary battery prepared thereby. Background technique [0002] At present, lithium secondary batteries are often used as secondary batteries with high energy density. This lithium secondary battery uses a non-aqueous electrolyte solution obtained by dissolving an electrolyte salt in a non-aqueous solvent, and makes lithium ions between the positive electrode and the negative electrode. Move to charge and discharge. Lithium ion batteries that use lithium transition metal oxides as positive electrode materials and utilize a reaction in which lithium ions intercalate are being commercialized. However, since the lithium contained in lithium-ion batteries is expensive, there is actually a demand for batteries that are less expensive...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/525H01M4/505H01M4/58C01D1/02H01M10/054
CPCY02E60/122C01D1/02C01D1/04H01M4/1391H01M4/505H01M4/525H01M10/054Y02E60/10H01M4/485H01M4/52
Inventor 宣良国吴承旼
Owner IUCF HYU (IND UNIV COOP FOUNDATION HANYANG UNIV)
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