Manufacturing method of positive active material precursor for sodium rechargeable batteries, positive active material precursor for sodium rechargeable batteries made by the same, and manufacturing method of positive active material for sodium rechargeable batteries, positive active material for sodium rechargeable batteries made by the same

Inactive Publication Date: 2015-11-19
IUCF HYU (IND UNIV COOP FOUNDATION HANYANG UNIV)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a method for producing a cathode active material precursor for a sodium secondary battery using a coprecipitation technique. The method adjusts the kind of complexing agent and pH value to improve the lifespan of the cathode active material and create a new composition. The resulting precursor exhibits improved performance in sodium secondary batteries. The patent also provides SEM images, particle size distribution, XRD measurement results, and other details on the production process. Overall, the method provides a more effective and reliable approach for producing high-quality cathode active material for sodium secondary batteries.

Problems solved by technology

However, lithium contained in the lithium ion battery is expensive, and thus a battery which is inexpensive and has a higher capacity is required.
However, a sodium secondary battery of the prior art is not satisfactory in lifespan characteristics, that is, the discharge capacity retention when the charge and discharge is repeated.
The most general method to produce a cathode active material for a lithium secondary battery or a sodium secondary battery of the prior art is a solid phase reaction method in which the powders of carbonate salts or hydroxides of the respective constituent elements as raw materials are subjected to the mixing and calcining process several times. However, the solid phase reaction method has disadvantages that it is difficult to form the solid solutions of the solid phases, impurities are easily mixed therein at the time of mixing, it is difficult to uniformly control the size of particles, and a high temperature and a long production time are required at the time of manufacture.
However, the solid phase reaction method is mainly adopted in order to produce a cathode active material for a sodium secondary battery of the prior art, but the method to produce a cathode active material precursor and a cathode active material for a sodium secondary battery by adopting the coprecipitation technique is rarely investigated.

Method used

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  • Manufacturing method of positive active material precursor for sodium rechargeable batteries, positive active material precursor for sodium rechargeable batteries made by the same, and manufacturing method of positive active material for sodium rechargeable batteries, positive active material for sodium rechargeable batteries made by the same
  • Manufacturing method of positive active material precursor for sodium rechargeable batteries, positive active material precursor for sodium rechargeable batteries made by the same, and manufacturing method of positive active material for sodium rechargeable batteries, positive active material for sodium rechargeable batteries made by the same
  • Manufacturing method of positive active material precursor for sodium rechargeable batteries, positive active material precursor for sodium rechargeable batteries made by the same, and manufacturing method of positive active material for sodium rechargeable batteries, positive active material for sodium rechargeable batteries made by the same

Examples

Experimental program
Comparison scheme
Effect test

examples 1 to 4

[0045]In a reactor, 4 L of distilled water filled and stirred at 1000 rpm while adding ammonia as the first pH adjusting agent so as to maintain the pH in the reactor at 7 and the internal temperature at 50° C. Into the reactor, a 4 M NaOH solution as the second pH adjusting agent was introduced and the pH in the reactor was adjusted to 10.2 and maintained for 30 minutes.

[0046]As an aqueous solution of transition metal compounds, NiSO4.6H2O, FeSO4.7H2O, and MnSO4.5H2O were mixed together in an equivalent ratio and introduced into the reactor together with NH4OH as the complexing agent, thereby producing a precursor represented by Ni0.25Fe0.25Mn0.5(OH)2 as presented in the following Table 1.

[0047]The precursors of Examples 2 to 4 respectively represented by Ni0.25Fe0.35Mn0.4(OH)2, Ni0.25Fe0.5Mn0.25(OH)2 and Ni0.15Fe0.35Mn0.5(OH)2 were produced in the same manner as in Example 1 except that the mixing ratio of the aqueous solution of transition metal compounds was adjusted in Example ...

experimental example 1

Taking of SEM Image

[0048]The SEM images of the precursors produced in Examples 1 to 4 were taken and the images taken are illustrated in FIGS. 1 to 4.

experimental example 2

Measurement of particle size distribution

[0049]The particle size distribution of the precursors produced in Examples 1 to 4 was measured and the results are illustrated in FIGS. 5 to 8.

[0050]It can be seen that the particle size distribution of the precursor particles produced in Examples of the embodiments of the inventive concept is a monodisperse type from FIGS. 5 to 8.

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Abstract

Disclosed is a method for producing a cathode active material precursor for a sodium secondary battery by using a coprecipitation technique and a cathode active material precursor for a sodium secondary battery produced thereby, and a cathode active material for a sodium secondary battery using the cathode active material precursor for a sodium secondary battery and a method for producing the same.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of PCT / KR2013 / 010520 filed Nov. 19, 2013 and PCT / KR2013 / 010521 filed Nov. 19, 2013, both of which claim the benefit of Korean patent applications KR 10-2012-0130824 filed Nov. 19, 2012, KR 10-2013-0140907 filed Nov. 19, 2013, KR 10-2012-0131027 filed Nov. 19, 2012, and KR 10-2013-0140911 filed Nov. 19, 2013, the contents of each of which are incorporated herein by reference in their entirety.FIELD OF THE INVENTION[0002]Embodiments of the inventive concepts described herein relate to a method for producing a cathode active material precursor for a sodium secondary battery by using a coprecipitation technique and a cathode active material precursor for a sodium secondary battery produced thereby, and a cathode active material for a sodium secondary battery using the cathode active material precursor for a sodium secondary battery and a method for producing the same.BACKGROUND OF THE INVENTION[0003]...

Claims

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Application Information

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IPC IPC(8): H01M4/36C01G53/00H01M10/054H01M4/525H01M4/505
CPCH01M4/364H01M4/525H01M2004/028H01M10/054C01G53/006H01M4/505C01G53/50C01P2002/72C01P2004/03C01P2004/51C01P2004/52C01P2004/61C01P2006/11C01P2006/40Y02E60/10
InventorSUN, YANG KOOKOH, SEUNG MINJANG, MIN WOO
OwnerIUCF HYU (IND UNIV COOP FOUNDATION HANYANG UNIV)