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Positive electrode active material for rechargeable lithium battery, preparation method thereof, and rechargeable lithium battery including positive electrode containing positive electrode active material

A positive active material, lithium battery technology, applied in active material electrodes, battery electrodes, positive electrodes, etc., can solve the problems of increased resistance, insufficient capacity characteristics, reduced cycle life, etc., to reduce residual lithium, excellent stability and electricity. Chemical properties, the effect of improving battery stability

Active Publication Date: 2022-07-29
SAMSUNG SDI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When such a positive electrode active material is used, since cracks are generated in the positive electrode active material when charge and discharge are repeated, the cycle life of the rechargeable lithium battery may decrease, the resistance may increase, and the capacity characteristics may be insufficient

Method used

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  • Positive electrode active material for rechargeable lithium battery, preparation method thereof, and rechargeable lithium battery including positive electrode containing positive electrode active material
  • Positive electrode active material for rechargeable lithium battery, preparation method thereof, and rechargeable lithium battery including positive electrode containing positive electrode active material
  • Positive electrode active material for rechargeable lithium battery, preparation method thereof, and rechargeable lithium battery including positive electrode containing positive electrode active material

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Experimental program
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Effect test

preparation example Construction

[0126] (1) Preparation process of the first nickel oxide

[0127] Synthesis of nickel-based active material precursors (Ni 0.6 Co 0.2 Mn 0.2 OH) to prepare the first nickel-based oxide. In the following production process, metal raw materials such as nickel sulfate, cobalt sulfate, and manganese sulfate are used to synthesize a nickel-based active material precursor.

[0128] [The first step: 1.5kW / m 3 , NH 4 OH 0.30M, pH 10 to 11, reaction time: 6 h]

[0129] First, ammonium hydroxide having a concentration of 0.30M was put into the reactor. At a reaction temperature of 50°C, at 1.5kW / m 3 The stirring power of 90 mL / min and 10 mL / min were respectively added metal raw material and complexing agent thereto to start the reaction.

[0130] The reaction was continued for 6 hours, during which time NaOH was injected to maintain pH. The core particles obtained from the reaction have an average size of about 5.5 μm to 6.5 μm. The second step proceeds as follows.

[0131] [...

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Abstract

A positive active material for a rechargeable lithium battery includes: a first positive active material comprising secondary particles comprising at least two agglomerated primary particles, wherein at least a portion of the primary particles have radially arranged structure; and a second cathode active material having an individual structure. Both the first positive electrode active material and the second positive electrode active material may include a nickel-based positive electrode active material. Also provided are methods for preparing the positive electrode active material and a positive electrode rechargeable lithium battery including the positive electrode active material.

Description

technical field [0001] A positive electrode active material for a rechargeable lithium battery, a preparation method thereof, and a rechargeable lithium battery including a positive electrode containing the same are disclosed. Background technique [0002] As portable electronic devices, communication devices, and the like are developed, there is a need to develop rechargeable lithium batteries with high energy density. [0003] The positive active material of the rechargeable lithium battery may be lithium nickel manganese cobalt composite oxide, lithium cobalt oxide and / or the like. When such a positive electrode active material is used, since cracks are generated in the positive electrode active material when charging and discharging are repeated, the cycle life of the rechargeable lithium battery may decrease, the resistance may increase, and the capacity characteristics may be insufficient. SUMMARY OF THE INVENTION [0004] 【technical problem】 [0005] Provided are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505C01G53/00H01M10/052
CPCY02E60/10H01M4/0471H01M4/131H01M4/1391H01M4/364H01M4/525H01M10/0525H01M2004/028C01G53/50C01P2006/40C01P2006/80C01P2004/61C01P2004/64C01P2004/51C01P2004/50C01G53/006C01P2006/11C01P2006/12H01M4/505H01M10/052
Inventor 金钟珉金志允金珍和
Owner SAMSUNG SDI CO LTD
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