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Positive electrode active material for lithium secondary battery and method for preparing positive electrode active material

A positive electrode active material, lithium secondary battery technology, applied in the direction of secondary batteries, lithium batteries, battery electrodes, etc., can solve the problem of long charging time and achieve the effect of improving output characteristics

Active Publication Date: 2021-09-17
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In particular, the main limitation of electric vehicles is the long charging time compared to vehicles with conventionally used engines

Method used

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  • Positive electrode active material for lithium secondary battery and method for preparing positive electrode active material
  • Positive electrode active material for lithium secondary battery and method for preparing positive electrode active material
  • Positive electrode active material for lithium secondary battery and method for preparing positive electrode active material

Examples

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Effect test

Embodiment 1

[0112] NiSO 4 、CoSO 4 and MnSO 4 Mix nickel:cobalt:manganese in distilled water at a molar ratio of 85:5:10 to prepare a 2.2 M transition metal-containing solution.

[0113] The vessel containing the transition metal-containing solution was connected to the 20 L reactor. Alternatively, prepare 4M NaOH solution and 15% NH 4 OH aqueous solution and connected to the reactor.

[0114] After putting 10 L of deionized water into a 20 L reactor set at 55 °C, the reactor was purged with nitrogen at a rate of 20 L / min to remove dissolved oxygen in the water and create a non-oxidizing atmosphere in the reactor. Then, 100 mL of 20% by weight NaOH aqueous solution and 100 to 160 mL of 15% by weight NH 4 Aqueous OH solution was added to the reactor and the pH in the reactor was adjusted to 12.5.

[0115] Thereafter, the transition metal-containing solution was added to the reactor at a rate of 1 L / h, and the NH 4 OH aqueous solution was added to the reactor at a rate of 100 mL / hour,...

Embodiment 2

[0120] A lithium transition metal oxide was prepared in the same manner as in Example 1 except that the carbon source was added at an addition rate of 70 mL / hour.

Embodiment 3

[0122] A lithium transition metal oxide was prepared in the same manner as in Example 1, except that 2000 ppm of Zr was doped when the positive active material precursor and LiOH were mixed and sintered.

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Abstract

The present invention relates to a method for preparing a positive electrode active material comprising: a first step of forming a core of precursor particles by inputting to a reactor a transition metal-containing solution comprising at least one of nickel, cobalt and manganese, an ammonium ion-containing solution and a reaction solution comprising a basic aqueous solution; a second step of preparing carbon-introduced precursor particles by inputting a carbon source to the reactor when the average particle diameter (D50) of the precursor particles grows to 30% of the average particle diameter (D50) of precursor particles which are to be finally prepared; and a third step of preparing positive electrode active material particles by mixing the carbon-introduced precursor particles and a lithium raw material and sintering same at 750 DEG C to 950 DEG C, wherein, by means of the sintering in the third step, the carbon introduced into the precursor particles is volatilized to form cavities in the positive electrode active material particles, and the cavity rate of the positive electrode active material is 5-20%.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2019-0122545 filed on October 2, 2019, the contents of which are incorporated herein by reference. technical field [0003] The invention relates to a positive electrode active material for a lithium secondary battery, a method for preparing the positive electrode active material, a positive electrode for a lithium secondary battery containing the positive electrode active material, and a lithium secondary battery. Background technique [0004] With the technological development and increase in demand for mobile devices, the demand for secondary batteries as energy sources has significantly increased. Among these secondary batteries, lithium secondary batteries having high energy density, high voltage, long cycle life, and low self-discharge rate have been commercialized and widely used. [0005] Recently, studies on increase in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/131H01M4/505H01M4/525H01M10/052
CPCC01G53/50H01M4/505H01M4/525H01M4/131H01M10/052H01M2004/021H01M2004/028C01P2004/61C01P2004/03C01P2006/12Y02E60/10C01G53/006C01P2006/40C01P2004/51C01P2002/54C01P2006/11C01P2006/14H01M10/0525
Inventor 申昊锡金元泰柳淙烈林英根申先植河昇哲
Owner LG CHEM LTD