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Cathode active material precursor for secondary battery, preparation method therefor, and method for preparing cathode active material

A positive electrode active material and secondary battery technology, which is applied in the direction of battery electrodes, active material electrodes, positive electrodes, etc., can solve the problems of increased particle surface density, difficulty in uniform sintering, and reduced reactivity, so as to improve capacity and rate performance. Effect of improving cycle characteristics

Pending Publication Date: 2021-12-03
LG CHEM LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of using a batch reactor, while the particle growth rate decreases with the lapse of reaction time, the density of the particle surface increases as the particle grows
If the primary particle size of the precursor particles is increased and the density of the particle surface is increased, since the surface energy is lowered, there is a limitation that when the positive electrode active material is subsequently prepared by using the precursor, the lithium source and the dopant are mixed during sintering. Reduced reactivity of foreign sources and difficulty in uniform sintering

Method used

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  • Cathode active material precursor for secondary battery, preparation method therefor, and method for preparing cathode active material
  • Cathode active material precursor for secondary battery, preparation method therefor, and method for preparing cathode active material
  • Cathode active material precursor for secondary battery, preparation method therefor, and method for preparing cathode active material

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preparation example Construction

[0031] The invention provides a method for preparing a positive electrode active material precursor for a secondary battery, the method comprising: adding a transition metal-containing solution containing a transition metal cation, an alkaline solution and an ammonium solution to a batch reactor Simultaneously, a cathode active material precursor is prepared by a co-precipitation reaction in which ammonium ions contained in the ammonium solution added to the batch reactor are mixed with transition metal cations contained in the transition metal-containing solution. The molar ratio is below 0.5, and the pH value in the batch reactor is maintained below 11.2.

[0032] The preparation method of the cathode active material precursor will be described in detail for each step.

[0033] First, a cathode active material precursor is prepared through a co-precipitation reaction while adding a transition metal-containing solution containing transition metal cations, an alkaline solution...

Embodiment 1

[0094] After putting 4 liters of distilled water into the batch reactor (capacity 20 L), the temperature was maintained at 60° C., oxygen was supplied at a rate of 3 liters / minute, and stirring was performed at 400 rpm.

[0095] where NiSO 4 、CoSO 4 and MnSO 4 An aqueous transition metal solution having a concentration of 2.28 mol / L mixed in such an amount that the molar ratio of nickel:cobalt:manganese is 92:4:4 was added to the reactor at a rate of 1200 ml / hour, and 15% by weight of ammonia The aqueous solution was continuously added to the reactor at a rate of 108 ml / hour (molar ratio of ammonium ions to total transition metal cations = 0.35). In addition, a 40% by weight aqueous sodium hydroxide solution was added at a rate of 330 ml / hour, and the addition of the aqueous sodium hydroxide solution was adjusted so that the pH was maintained at 11.1.

[0096] Nucleation was performed while stirring at 700 rpm for the first 30 minutes, after which the particles were grown w...

Embodiment 2

[0098] Except that ammonia solution was continuously added to the reactor at a rate of 62 ml / hour (the molar ratio of ammonium ions to total transition metal cations=0.2), the positive electrode active material was prepared in the same manner as in Example 1. body.

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Abstract

The present invention relates to a method for preparing a cathode active material precursor for a secondary battery by performing a coprecipitation reaction while injecting, into a batch type reactor, a transition metal-containing solution containing a transition metal cation, a basic solution and an ammonium solution, wherein the molar ratio of the ammonium ion included in the ammonium solution to the transition metal cation included in the transition metal-containing solution injected into the batch type reactor is 0.5 or less, and the pH inside the batch type reactor is maintained to be 11.2 or less.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2019-0119111 filed on September 26, 2019, the disclosure of which is incorporated herein by reference. technical field [0003] The invention relates to a positive electrode active material precursor for a secondary battery, a preparation method thereof and a preparation method of the positive electrode active material. Background technique [0004] Recently, with the rapid spread of electronic devices using batteries, such as mobile phones, notebook computers, and electric vehicles, the demand for secondary batteries that are relatively high in capacity and small in size and light in weight has rapidly increased. In particular, lithium secondary batteries have attracted attention as driving power sources for portable devices due to their light weight and high energy density. Therefore, research and development work for improvin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/131H01M4/1391
CPCH01M4/36H01M4/485H01M4/131H01M4/1391H01M4/505H01M4/525H01M2004/021H01M2004/028C01G53/006C01P2004/61C01P2006/12C01P2004/03C01P2006/40C01G53/50C01P2006/10C01P2006/11C01P2004/54Y02E60/10C01G53/44C01P2002/52
Inventor 李旼俊曹昇范芮成知朴润彬
Owner LG CHEM LTD
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