Electrode active material for lithium secondary battery and method for manufacturing same

A technology of electrode active materials and lithium secondary batteries, which is applied in secondary battery manufacturing, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of initial efficiency degradation and low initial efficiency, and achieve improved conductivity and good rate performance, effect of minimizing dead volume

Inactive Publication Date: 2014-11-12
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the use of such metal oxides solves the problem of metal-based electrode active materials, its initial efficiency is lower than that of graphite-based electrode active materials and forms irreversible phase materials such as lithium oxide and lithium-ion in the initial reaction with lithium ions. Metal oxides, whereby initial efficiency deteriorates, even lower than metal-based electrode active materials

Method used

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  • Electrode active material for lithium secondary battery and method for manufacturing same
  • Electrode active material for lithium secondary battery and method for manufacturing same
  • Electrode active material for lithium secondary battery and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069]

[0070] 50 parts by weight of lithium chloride (LiCl) was dissolved in ethanol, and 50 parts by weight of SiO were uniformly dispersed therein to obtain a dispersion liquid. The dispersion liquid was heated to 70° C. to remove the solvent used, thereby obtaining a mixture. The mixture was annealed at 800° C. under Ar atmosphere to prepare the nucleating material according to the present invention.

[0071]

[0072] 40mmol resorcinol, 40mmol formaldehyde (3000ml37% by weight aqueous solution), 0.75mmol sodium carbonate as catalyst and 9.88mmol cetyltrimethylammonium bromide (CTAB) as dispersant are dispersed in 1000ml distilled water, 10 g of a nucleating material was added thereto, followed by heating at 85° C. for 3 days, thereby obtaining a resorcinol-formaldehyde (RF) sol solution.

[0073] The RF sol containing the nucleation material obtained above was annealed at 900° C. for 5 hours under an Ar atmosphere, thereby forming a conductive carbon layer on the sur...

Embodiment 2

[0080] The procedure of Example 1 was repeated except that the coating of the conductive carbon material was performed by using methane as a raw material in a rotary tube furnace, thereby preparing an electrode active material and a battery.

[0081] The formation of the conductive carbon coating using methane is specifically carried out as follows.

[0082] 20 g of nucleating material was introduced into a rotary tube furnace where argon was supplied at a rate of 0.5 L / min and the temperature of the furnace was raised up to 900 °C at a rate of 5 °C / min. While supplying 1.8 L / min of argon gas and 0.3 L / min of methane gas, heat treatment was performed by rotating a rotary tube furnace at 10 rpm for 5 hours, thereby preparing an electrode active material having a conductive carbon coating.

[0083] It was confirmed that the amount of conductive carbon in the conductive carbon layer was 5 parts by weight based on 100 parts by weight of the nucleating material. The TEM photo of t...

Embodiment 3

[0085] The procedure of Example 1 was repeated except that the coating of the conductive carbon material was carried out by mixing 100 parts by weight of the nucleating material with 10 parts by weight of D 50 = 15 μm of artificial graphite was mixed; with a 5:1 weight ratio, stainless steel balls with a diameter of 3 mm and the powder of the resulting mixture were put into a mechanical fusion device (Hosokawa Micron); then at 600 rpm Mechanical alloying was carried out and continued for 30 minutes.

[0086] The TEM photo of the electrode active material with conductive carbon layer according to the present invention is shown in image 3 middle.

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Abstract

PURPOSE: An electrode active material for a lithium secondary battery is provided to have a high initial efficiency value while having higher capacity than that of a carbon-based electrode active material, to prevent the loss of an initial efficiency, and to improve diffusion rate. CONSTITUTION: An electrode active material includes a core part including a primary particle formed of (semi)metal oxide capable of forming alloy with lithium and a secondary particle formed of oxide simultaneously containing the (semi)metal and lithium; and a conductive carbon layer coated on the outer side of the core part. A manufacturing method of the electrode active material includes a step of mixing a lithium salt not including oxygen and the (semi)metal oxide and manufacturing a core part material by heat-treating the mixture; and a step of coating the surface of the core part material with the conductive carbon. [Reference numerals] (AA) Core unit; (BB) Conductive carbon layer

Description

technical field [0001] The invention relates to an electrode active material for a lithium secondary battery, a preparation method thereof, and a lithium secondary battery prepared using the electrode active material. [0002] This application claims priority from Korean Patent Application No. 10-2012-0020471 filed in Korea on February 28, 2012, the contents of which are incorporated herein by reference. [0003] Furthermore, this application claims priority from Korean Patent Application No. 10-2013-0021271 filed in Korea on February 27, 2013, the contents of which are incorporated herein by reference. Background technique [0004] Recently, lithium secondary batteries have attracted great attention due to their high energy density and long cycle life. Generally, a lithium secondary battery includes a negative electrode made of a carbon material or a lithium-metal alloy, a positive electrode made of a lithium-metal oxide, and an electrolytic solution obtained by dissolving...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/48H01M10/04
CPCH01M4/366H01M4/13Y02E60/122H01M4/485H01M4/625H01M4/0402H01M4/0471H01M4/131H01M4/364H01M4/483H01M10/052Y02E60/10Y02P70/50H01M4/0495
Inventor 李龙珠金帝映崔丞延郑东燮
Owner LG CHEM LTD
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