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Method for manufacturing positive electrode active material for lithium secondary battery and positive electrode active material for lithium secondary battery manufactured thereby

A positive electrode active material, lithium secondary battery technology, applied in the direction of active material electrodes, battery electrodes, lithium batteries, etc., can solve the problems of low thermal stability, battery rupture, performance degradation of positive electrode materials, etc., to improve conductivity and prevent condensation Gelling, effects that improve input/output characteristics

Pending Publication Date: 2022-08-02
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when combined with LiCoO 2 When compared to LiNiO 2 Has lower thermal stability, and there is a problem that when an internal short circuit occurs in a charged state due to external pressure, etc., the positive electrode active material itself decomposes, causing rupture and fire of the battery
However, in the case of carbon coating, the disadvantage is that it should be accompanied by high-temperature heat treatment for carbonization, and when the high-temperature heat treatment is performed, the carbon element on the surface reacts with the oxygen on the surface of the positive electrode material and is reduced, which causes the positive electrode material A large change in the oxidation number of the anode material leads to the deterioration of the performance of the cathode material

Method used

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  • Method for manufacturing positive electrode active material for lithium secondary battery and positive electrode active material for lithium secondary battery manufactured thereby
  • Method for manufacturing positive electrode active material for lithium secondary battery and positive electrode active material for lithium secondary battery manufactured thereby
  • Method for manufacturing positive electrode active material for lithium secondary battery and positive electrode active material for lithium secondary battery manufactured thereby

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Embodiment approach

[0096] Hereinafter, the present invention will be described in detail with reference to the embodiments. However, the embodiments according to the present invention may be modified into other various forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.

Embodiment 1

[0099] will be composed of LiNi 0.6 CO 0.2 Mn 0.2 O 2 The indicated lithium transition metal oxide and carbon black having the hollow structure of the specifications in Table 1 below were introduced into a paint stirrer (1400Al classic stirrer, Red Devil Co., Ltd), and then mixed for 60 minutes so that the carbon black was relative to 500 g. The lithium transition metal oxide was 1 wt %, so that the transition metal oxide and the carbon black of the hollow structure were uniformly dispersed.

[0100] The above mixture was introduced into a mechanofusion apparatus (nobilta, Hosokawa Micron Co., Ltd), and then processed at 3000 rpm for 10 minutes to produce a positive electrode active material in which a carbon coating layer with a thickness of 200 nm was formed on the lithium transition metal oxide.

Embodiment 2

[0102] Except that the mixing was carried out in such a way that the carbon black was 1 wt % with respect to 200 g of the lithium transition metal oxide, in the same manner as in Example 1, a carbon black having a thickness of 250 nm was produced in the same manner as in Example 1. Carbon-coated cathode active material.

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Abstract

The present invention relates to a method for manufacturing a positive electrode active material, a positive electrode active material manufactured by the method, a positive electrode comprising the positive electrode active material, and a lithium secondary battery. The method comprises the following steps: mixing a lithium transition metal oxide and a carbon-based material with a hollow structure to form a mixture; and mechanically treating the mixture to form a carbon coating layer on the surface of the lithium transition metal oxide, in which the carbon-based material of the hollow structure is chain-shaped and has a specific surface area of 500 m2 / g or more, a degree of graphitization (ID / IG) of 1.0 or more, and a DBP oil absorption of 300 mL / 100 g or more.

Description

technical field [0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims the benefit of based on Korean Patent Application No. 10-2020-0011338 filed in the Korean Intellectual Property Office on Jan. 30, 2020, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a method for producing a positive electrode active material for a lithium secondary battery, a positive electrode active material produced by the production method, a positive electrode for a lithium secondary battery including the positive electrode active material, and a lithium secondary battery. Background technique [0004] With the technological development and increasing demand of mobile devices, the demand for secondary batteries as an energy source is rapidly increasing. Among these secondary batteries, lithium secondary batteries having high energy density and high voltage, long cycle life and low se...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/62H01M10/052H01M4/02
CPCH01M10/052H01M4/505H01M4/525Y02E60/10H01M2004/028H01M4/625H01M4/366H01M4/131C01G53/50C01P2002/50C01P2002/74C01P2004/03C01P2004/50C01P2004/64C01P2004/80C01P2006/12C01P2006/19C01P2006/40H01M2004/021
Inventor 郭玟金泰坤朴炳天李宝蓝柳泰求
Owner LG ENERGY SOLUTION LTD
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