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Cathode active material comprising multi-layered transition metal oxide for lithium secondary battery, and cathode comprising cathode active material

一种正极活性物质、锂二次电池的技术，应用在活性物质电极、锂蓄电池、电池电极等方向，能够解决循环特性降低、没有充分解决、膨胀化学稳定性低等问题，达到改善寿命的效果

Active Publication Date: 2018-04-17
LG ENERGY SOLUTION LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such metal-substituted nickel-based lithium transition metal oxides are advantageous in that they have relatively excellent cycle characteristics and capacity characteristics, but even in this case, when used for a long time, the cycle characteristics are drastically reduced, and Issues such as swelling due to battery gas generation and deterioration of thermal stability due to low chemical stability are not adequately addressed

Method used

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  • Cathode active material comprising multi-layered transition metal oxide for lithium secondary battery, and cathode comprising cathode active material
  • Cathode active material comprising multi-layered transition metal oxide for lithium secondary battery, and cathode comprising cathode active material
  • Cathode active material comprising multi-layered transition metal oxide for lithium secondary battery, and cathode comprising cathode active material

Examples

Experimental program
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Embodiment 1

[0077] (Manufacture of precursors for positive electrode active materials)

[0078] In order to manufacture a precursor for the manufacture of a positive electrode active material for secondary batteries, first, 2 L of distilled water was filled into a tank of a 3 L wet reactor, and then nitrogen gas was continuously injected into the tank at a rate of 1 L / min to remove dissolved oxygen . At this time, the temperature of the distilled water in the tank was maintained at 45°C to 50°C by using a heat preservation device. In addition, the distilled water in the tank was stirred at a speed ranging from 1000 rpm to 1200 rpm using a stirring paddle connected to a motor provided outside the tank.

[0079] Nickel sulfate, manganese sulfate, and cobalt sulfate were mixed at a ratio (molar ratio) of 0.55:0.25:0.2 to prepare a 1.5M transition metal aqueous solution. In addition, a 3M aqueous sodium hydroxide solution was also prepared. An aqueous transition metal solution was added at...

Embodiment 2

[0089] A battery was fabricated in the same manner as in Example 1, except that a 1.5 M transition metal aqueous solution was prepared by mixing nickel sulfate, manganese sulfate, and cobalt sulfate at a ratio (molar ratio) of 0.6:0.2:0.2.

Embodiment 3

[0091] A battery was fabricated in the same manner as in Example 1, except that a salt containing zirconium (Zr) as a doping element was not supplied during the production of the precursor for producing the positive electrode active material for a secondary battery.

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Abstract

The present invention provides a positive electrode active material for a lithium secondary battery having a core-shell structure which comprises: a core composed of lithium transition metal oxides including nickel(Ni), manganese(Mn) and cobalt(Co); and a shell composed of lithium transition metal oxides including cobalt(Co), wherein an inorganic material layer is further formed by coating on thesurface of the shell.

Description

technical field [0001] This application claims the benefit of priority of Korean Patent Application No. 10-2015-0145825 filed with the Korean Intellectual Property Office on October 20, 2015, the entire disclosure of which is incorporated herein by reference. [0002] The present invention relates to a positive electrode active material for a lithium secondary battery containing a lithium metal oxide having a multilayer structure, and a positive electrode containing the same. Background technique [0003] Due to the rapid increase in the use of fossil fuels, there is an increasing demand for the use of alternative and clean energy sources, and in order to meet this demand, the most active research is in the field of power generation and storage using electrochemistry. [0004] As a representative example of an electrochemical device using electrochemical energy, a secondary battery is currently used, and its application field is gradually expanding. [0005] Recently, as th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/131H01M10/052H01M2/10
CPCH01M4/131H01M4/505H01M4/525H01M4/1391H01M4/366H01M4/62C01G53/50C01P2004/84H01M10/052Y02E60/10H01M2220/30H01M50/20H01M4/48H01M4/0416H01M4/0471H01M2004/021H01M2004/028Y02P70/50H01M4/133H01M4/134H01M4/1393H01M4/1395H01M2004/027
Inventor 柳玟圭申昊锡朴洪奎
Owner LG ENERGY SOLUTION LTD
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