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Method for producing positive electrode active material for secondary batteries

A positive electrode active material and secondary battery technology, applied to battery electrodes, positive electrodes, electrode heat treatment, etc., can solve the problems of high concentration of oxygen, increased manufacturing costs, etc., achieve excellent crystallinity, suppress the increase in resistance, and improve The effect of structural stability

Pending Publication Date: 2021-08-24
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, typically, since a high-Ni positive electrode active material is prepared in an oxidizing atmosphere, there is a limitation that the amount of high-concentration oxygen consumed is large and the manufacturing cost increases

Method used

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  • Method for producing positive electrode active material for secondary batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] In a 5L batch reactor set at 60°C, NiSO 4 、CoSO 4 and MnSO 4 Mixed in water, thereby preparing a precursor-forming solution having a concentration of 2.4M.

[0080]1 L of deionized water was put into a co-precipitation reactor (capacity 5 L), and then the reactor was purged with nitrogen gas at a rate of 2 L / min to remove dissolved oxygen in the water and generate a non-oxidizing atmosphere in the reactor. Thereafter, 10 ml of a 25% NaOH aqueous solution was added, followed by stirring at a speed of 1200 rpm and a temperature of 60° C. to maintain a pH of 12.0.

[0081] Subsequently, with aqueous NaOH and NH 4 OH aqueous solution is added together with the speed of 180ml / hr while adding the solution that forms the precursor, carry out co-precipitation reaction 18 hours, thereby form the hydroxide containing nickel-cobalt-manganese (Ni 0.8 co 0.1 mn 0.1 (OH) 2 )particle of. The hydroxide particles were separated, washed, and then dried in an oven at 120° C. to pr...

Embodiment 2

[0085] A positive electrode active material was prepared in the same manner as in Example 1 except that pre-sintering was performed once at 500°C.

Embodiment 3

[0087] A positive electrode active material was prepared in the same manner as in Example 1 except that pre-sintering was performed once at 400°C.

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Abstract

The present invention pertains to a method for producing a positive electrode active material for secondary batteries, the method comprising: a step for preparing a positive electrode active material precursor containing at least 60 mol% of nickel (Ni) with respect to the entirety of the metal components; a step for mixing the positive electrode active material precursor and a lithium source material, and performing first pre-firing under an oxidizing atmosphere to form a pre-fired product; and a step for performing a second main-firing on the pre-fired product under an air atmosphere to form a lithium transition metal oxide.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2019-0007296 filed on January 21, 2019, the disclosure of which is incorporated herein by reference. [0003] The invention relates to a method for preparing positive electrode active materials for secondary batteries. 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 increased dramatically. In particular, since lithium secondary batteries are light in weight and have high energy density, lithium secondary batteries are in focus as driving power sources of portable devices. Therefore, research and development attempts to improve the performance of lithium secondary batteries have been actively made. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/525H01M4/505
CPCH01M4/525Y02E60/10C01G53/006C01G53/50C01P2006/40C01P2002/32C01P2002/22C01P2002/52C01P2006/82H01M4/131H01M4/1391H01M4/0471C01G53/44H01M4/505H01M2004/028
Inventor 李炅录慎志娥柳玟圭崔相洵
Owner LG CHEM LTD
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