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Anode active material for lithium secondary battery, method for fabricating same, and lithium secondary battery using same

A positive electrode active material and lithium secondary battery technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of discontinuous changes in metal composition, unstable internal structure, and inability to form a full concentration gradient. Achieves effects of improved stability and conductivity, excellent charge/discharge characteristics

Inactive Publication Date: 2015-09-09
IUCF HYU (IND UNIV COOP FOUND HANYANG UNIV)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the metal composition of the cathode active material located between the generated inner material and outer material is discontinuously changed, and there are problems such as instability of the inner structure.
[0008] Further, Korean Patent No. 10-0693822 proposes to use a positive electrode active material that forms a concentration gradient as a result of coating or replacing the surface of the core. However, as a result of coating or replacing to improve the surface, the core and the core layer The concentration gradient is formed in the interface area, and there are problems such as the inability to form a full concentration gradient

Method used

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  • Anode active material for lithium secondary battery, method for fabricating same, and lithium secondary battery using same
  • Anode active material for lithium secondary battery, method for fabricating same, and lithium secondary battery using same
  • Anode active material for lithium secondary battery, method for fabricating same, and lithium secondary battery using same

Examples

Experimental program
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Effect test

preparation example 1

[0063] Preparation of an active material precursor with a core-shell structure

[0064] In order to prepare particles with a constant concentration of core and a constant concentration of shell, nickel sulfate, cobalt sulfate, and manganese sulfate were mixed at a molar ratio of 90:5:5 to prepare a 2.4M concentration metal aqueous solution as the metal for core formation A saline solution, and an aqueous metal solution containing nickel sulfate, cobalt sulfate, and manganese sulfate in a molar ratio of 65:10:25 was prepared as an aqueous metal salt solution for forming a surface portion. 4 L of distilled water was poured into a co-precipitation reactor (volume: 4 L, rotating motor power: 80 W); nitrogen gas was fed into the reactor at a rate of 0.5 L / min to remove dissolved oxygen; and stirred at 1000 rpm while maintaining The temperature of the reactor was at 50°C.

[0065] The metal salt solution for forming the core is first fed into the reactor to form the core, and the ...

preparation example 2

[0066] Preparation of an active material precursor with a core-shell structure in a concentration gradient

[0067] Mix nickel sulfate, cobalt sulfate and manganese sulfate in a molar ratio of 90:5:5 to prepare an aqueous metal solution with a concentration of 2.4M, and prepare an aqueous metal solution containing nickel sulfate, cobalt sulfate and manganese sulfate in a molar ratio of 55:15:30 as An aqueous solution of a metal salt used to form the surface portion. The metal salt solution for forming the core was first fed into the reactor to form the core, and the metal salt solution for forming the surface part was mixed at a constant ratio gradually changed and mixed at a rate of 0.3 L / hour. A constant rate is fed into the reactor to prepare an active material precursor consisting of a constant concentration of the core and a concentration gradient of the shell.

[0068] Preparation of an active material precursor in which the metal ion concentration is gradient through...

preparation example 4

[0070] Preparation of an active material precursor having two metal concentration gradients

[0071] The operation of Preparation Example 1 was repeated, except that a solution in which nickel sulfate, cobalt sulfate and manganese sulfate were mixed in a molar ratio of 98:00:02 was first used as an aqueous metal salt solution for forming a nucleus, and nickel sulfate, cobalt sulfate and sulfuric acid were used A solution of manganese mixed in a molar ratio of 85:05:10 is used as a metal salt solution for forming the surface part to prepare a shell with a certain thickness and a concentration gradient, and then nickel sulfate, cobalt sulfate and manganese sulfate are used in a ratio of 65:10:25 A solution mixed in a molar ratio is used to prepare a shell with a certain thickness to form a concentration gradient in the two shells to prepare an active material precursor.

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Abstract

Provided in the present invention are a cathode active material for a lithium secondary battery having more than one coating layer, a method for manufacturing the same and a lithium secondary battery including the same. By forming the coating layers with material having high electric conductivity on the surface of the cathode active material, the electric conductivity can be enhanced to have excellent charging-discharging properties, lifespan and thermal stability.

Description

technical field [0001] The present invention relates to a positive electrode active material for a lithium secondary battery, a preparation method thereof, and a lithium secondary battery containing the same. More specifically, it relates to a positive electrode active material for a lithium secondary battery by forming one or more A positive electrode active material having excellent life characteristics and charging / discharging characteristics due to a coating layer, a preparation method thereof, and a lithium secondary battery containing the same. Background technique [0002] Based on the recent rapid development of electronics, communications, computer industries, etc., the use of portable electronic devices, such as video cameras, mobile phones, notebook computers, etc., has become common. Accordingly, there is an increasing demand for batteries that are lightweight, highly reliable, and have a longer life. In particular, lithium secondary batteries with an operating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M10/052
CPCY02E60/122H01M4/131H01M4/366H01M4/505H01M4/525H01M10/052Y02E60/10
Inventor 宣良国卢亨周李尚奕
Owner IUCF HYU (IND UNIV COOP FOUND HANYANG UNIV)
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