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Cathode material for lithium secondary battery, and cathode and lithium secondary battery which comprise same

A cathode material, cathode active material technology, applied in the field of cathodes and lithium secondary batteries, can solve the problems of reducing energy density, current collector breakage, low particle rolling density, etc., and achieve excellent high temperature life characteristics, excellent capacity characteristics, high The effect of rolling density

Active Publication Date: 2020-06-19
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when combined with LiCoO 2 When compared, LiNiO 2 low thermal stability
In addition, LiNiO 2 Has the problem that when an internal short circuit occurs due to external pressure in a charged state, etc., the positive electrode active material itself decomposes, resulting in rupture and ignition of the battery
[0007] However, the particle rolling density of lithium nickel-cobalt-manganese oxide is low
In particular, when the Ni content was increased to increase the capacity characteristics, the rolling density of the particles even decreased, thereby reducing the energy density
When the electrode is subjected to high-pressure rolling to increase the rolling density, there are problems of current collector cracking and positive electrode material cracking
[0008] In addition, in the case of lithium nickel-cobalt-manganese oxides with high Ni content, the structural stability at high temperature is reduced, so that the electrochemical performance such as high temperature lifetime is deteriorated.

Method used

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  • Cathode material for lithium secondary battery, and cathode and lithium secondary battery which comprise same
  • Cathode material for lithium secondary battery, and cathode and lithium secondary battery which comprise same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] The average particle size (D 50 ) is 5μm LiNi 0.8 co 0.1 mn 0.1 o 2 and average particle size (D 50 ) is 15μm LiNi 0.83 co 0.11 mn 0.04 Al 0.02 o 2 Mix with a weight ratio of 30:70 to prepare positive electrode material A.

[0107] The positive electrode material A prepared as described above, the carbon black conductive material and the PVdF binder were mixed in a weight ratio of 96:2:2, and then the mixture was mixed in NMP solvent to prepare a positive electrode mixed material. The positive electrode mixture material was coated on an aluminum foil having a thickness of 12 μm, dried, and then rolled to manufacture a positive electrode.

[0108] Meanwhile, graphite negative electrode active material, carbon conductive material (SuperC65), and PVdF binder were mixed in a weight ratio of 95.6:0.75:3.65, and then the mixture was added to NMP solvent to prepare negative electrode mixed material. The anode mixture material was coated on a copper foil with a thick...

Embodiment 2

[0111] The average particle size (D 50 ) is 15μm LiNi 0.8 co 0.1 mn 0.1 o 2 and average particle size (D 50 ) is 5μm LiNi 0.83 co 0.11 mn 0.04 Al 0.02 o 2 Mix with a weight ratio of 70:30 to prepare positive electrode material B.

[0112] A lithium secondary battery was manufactured in the same manner as in Example 1, except that the positive electrode material B prepared as above was used instead of the positive electrode material A.

Embodiment 3

[0114] The average particle size (D 50 ) is 10μm LiNi 0.8 co 0.1 mn 0.1 o 2 and average particle size (D 50 ) is 5μm LiNi 0.83co 0.11 mn 0.04 al 0.02 o 2 Mix with a weight ratio of 70:30 to prepare positive electrode material C.

[0115] A lithium secondary battery was manufactured in the same manner as in Example 1, except that the positive electrode material C prepared above was used instead of the positive electrode material A.

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Abstract

The present invention relates to: a cathode material comprising a first cathode active material represented by chemical formula 1 and a second cathode active material represented by chemical formula 2, wherein the cathode material has a bimodal particle distribution comprising large-diameter particles and small-diameter particles, and the difference in average diameter (D50) between the large-diameter particles and the small-diameter particles is at least 3 mum; and a cathode and a lithium secondary battery which comprise the same.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to 10-2017-0155957 filed with the Korean Intellectual Property Office on November 21, 2017, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a positive electrode material for a lithium secondary battery, a positive electrode including the same, and a lithium secondary battery. Background technique [0004] With the development of technology and the increase in demand for mobile devices, the demand for secondary batteries as energy sources is rapidly increasing. Among such secondary batteries, lithium secondary batteries having high energy density and voltage, long cycle life, and low self-discharge rate have been commercialized and widely used. [0005] As a positive electrode active material of a lithium secondary battery, a lithium transition metal composite oxide is used. Among such lithium-transi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/485H01M10/052
CPCH01M4/485H01M4/505H01M4/525H01M10/052Y02E60/10H01M4/131H01M4/364H01M4/366H01M4/66H01M10/0525H01M2004/021H01M2004/027H01M2004/028H01M50/46
Inventor 李东勋郑王谟朴星彬金智惠金东晖曹炯万韩政珉
Owner LG ENERGY SOLUTION LTD
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