Cathode active material for lithium secondary battery, production method therefor, cathode comprising same for lithium secondary battery, and lithium secondary battery comprising same

A cathode active material, lithium secondary battery technology, used in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve problems such as the decline of discharge capacity and output characteristics, achieve excellent output characteristics, reduce manufacturing costs, and improve structural stability sexual effect

Pending Publication Date: 2020-11-27
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the limitation of lithium nickel cobalt manganese oxide is that when the nickel content is the same, the discharge capacity and output characteristics decrease with the decrease of cobalt content

Method used

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  • Cathode active material for lithium secondary battery, production method therefor, cathode comprising same for lithium secondary battery, and lithium secondary battery comprising same
  • Cathode active material for lithium secondary battery, production method therefor, cathode comprising same for lithium secondary battery, and lithium secondary battery comprising same
  • Cathode active material for lithium secondary battery, production method therefor, cathode comprising same for lithium secondary battery, and lithium secondary battery comprising same

Examples

Experimental program
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preparation example Construction

[0081] In the preparation of the positive electrode active material precursor, it is possible to control the pH in such a manner that it decreases as the nickel content in the mixed solution decreases.

[0082] For example, the pH may gradually decrease within the range of 13 to 9, preferably 12.5 to 9, most preferably 12 to 10 as the nickel content in the mixed solution decreases. In the case of controlling the gradual decrease in pH as the nickel content decreases during the preparation of the cathode active material precursor as described above, the c-axis direction on the surface of the finally prepared cathode active material particle can be effectively controlled.

[0083] Specifically, at least 8 points on the surface of the positive electrode active material, the angle between the c-axis direction measured by TEM analysis and the growth direction at the measurement point satisfies a ratio of 85° to 95° as More than 60% of the way to form the positive electrode active m...

Embodiment approach

[0133] Hereinafter, the present invention will be described in detail based on specific examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these example embodiments are provided so that this description will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Embodiment 1

[0136] (Preparation of positive electrode active material)

[0137] By adding NiSO in such an amount that the nickel:manganese molar ratio 4 and MnSO 4 Mix in water to prepare a first transition metal-containing solution at a concentration of 2.3M.

[0138] In addition, by adding NiSO 4 、CoSO 4 and MnSO 4 Mix in water to prepare a second transition metal-containing solution at a concentration of 2.3M.

[0139] The vessel containing the first transition metal-containing solution and the vessel containing the second transition metal-containing solution were connected to a 250 L reactor set at 53°C. Alternatively, prepare a solution of 25% NaOH and 15% NH 4 OH aqueous solution and connect it to the reactor separately.

[0140] Subsequently, 55 L of deionized water was put into the reactor, and then the reactor was purged with nitrogen gas at a rate of 200 L / min to remove dissolved oxygen in the water and create a non-oxidative atmosphere in the reactor. Thereafter, 50 mL ...

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Abstract

The present invention relates to a cathode active material, a production method for the cathode active material, a cathode comprising the cathode active material for a lithium secondary battery, and alithium secondary battery comprising the cathode active material, the cathode active material material being characterized by: comprising a lithium transition metal oxide having an average composition represented by chemical formula 1; having lower cobalt content than manganese content in the lithium transition oxide, the lithium transition oxide having a a concentration gradient in which the concentration of at least one of nickel, cobalt, and manganese varies gradually from the center to the surface of the particle; being in the form of secondary particles resulting from the aggregation ofprimary particles; and the percentage with which the growth direction of the particle at the measurement sites form 85 to 95 degrees with the c-axis is 60% or greater, as measured at 8 or more sites of the surface of the cathode active material by TEM analysis. [chemical formula 1] Li1+aNixCoyMnzM1WO2, wherein 0 <= a <= 0.3, 0.65 <= x<1, 0<y <= 0.35, 0<z <= 0.35, 0 <= w <= 0.02, and y < z, and M1is at least one selected from the group consisting of Al, Zr, Mg, Zn, Y, Fe, and Ti.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 2018-0054292 filed with the Korean Intellectual Property Office on May 11, 2018, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a positive electrode active material for a lithium secondary battery, a method for preparing the positive electrode active material, and a positive electrode for a lithium secondary battery and a lithium secondary battery comprising the positive electrode active material. Background technique [0004] With the technological development and increase in demand for mobile devices, the demand for secondary batteries as energy sources has significantly increased. Among these secondary batteries, lithium secondary batteries having high energy density, long cycle life, and low self-discharge rate have been commercialized and wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/485C01G53/00H01M10/052
CPCH01M10/052H01M4/525Y02E60/10H01M2004/028C01G53/50C01P2006/40C01P2004/04C01G53/006H01M4/505H01M4/485C01P2002/52H01M4/0471H01M4/131H01M4/134H01M4/364H01M10/0525
Inventor 郑明寄孙世焕曹昇范崔相洵
Owner LG CHEM LTD
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