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Composite particles for anode active material and anode for all-solid-state battery comprising same

A negative electrode active material and composite particle technology, applied in the direction of active material electrodes, battery electrodes, batteries, etc., can solve the problems of reduced contact area, reduced capacity and output, reduced electrochemical reaction sites, etc., to achieve increased contact area Effect

Active Publication Date: 2020-11-03
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When carbon materials such as spherical graphite are used as negative electrode active materials for all-solid-state batteries, the electrolyte can penetrate into the pores of the graphite particles if a liquid electrolyte is used, but the pores remain empty in the case of a solid electrolyte, And the contact area between the electrolyte and the active material particles is reduced, that is, the sites where electrochemical reactions can occur are reduced, resulting in reduced capacity and output

Method used

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  • Composite particles for anode active material and anode for all-solid-state battery comprising same
  • Composite particles for anode active material and anode for all-solid-state battery comprising same
  • Composite particles for anode active material and anode for all-solid-state battery comprising same

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preparation example Construction

[0052] Preparation method of composite particles

[0053] The present disclosure provides methods of making composite particles. Composite particles can be obtained by preparing a mixture comprising a graphite material as described above, a conductive material, and a solid electrolyte, and subjecting the mixture to a spherical granulation process by applying an external mechanical force to obtain composite particles, wherein the graphite material, A conductive material and a solid electrolyte are integrally formed into the composite particles.

[0054] Mixing can be performed using a known mixer such as a planetary mixer. For example, graphite material, conductive material and solid electrolyte are put into a mixer and stirred into a mixture at a rate of about 20 rpm to 100 rpm. Mixing may be performed at a temperature of about 30°C to 100°C for about 1 hour to 3 hours. However, stirring conditions such as speed, time and temperature are not limited to the above ranges an...

preparation example 1

[0082] 1) Preparation Example 1: Preparation of Composite Particles

Embodiment 1

[0084] Plate-shaped natural graphite (BTR UP10, average particle size (D 50 )=9μm), Li 7 La 3 Zr 2 o 12 and carbon black at a weight ratio of 84:15:1 into a 500ml-capacity planetary mixer (pri-mix, 2P-03), and stirred at room temperature at 50rpm for 60 minutes to prepare a mixture. The temperature of the planetary mixer was maintained at 40°C. The obtained mixture was put into a mechanical fusion system (Hosokawa Micron NOB-130-VC) and shear and compressive stress were applied at 3,000 rpm for 30 minutes to prepare composite particles. In this case, the temperature of the mechanofusion system was maintained at 40°C. The obtained composite particles had a particle diameter of about 15 μm. After the composite particles were diluted 1000 times in xylene, the particle size and particle size distribution were measured using a Malvern mastersizer 3000.

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Abstract

Composite particles which are anode active materials, according to the present invention, sufficiently secure electrochemical reaction sites of solid electrolytes and electrode active materials, and thus, problems of capacity reduction and output reduction do not occur. The composite particles according to the present invention are filled with a conductive material comprising solid electrolytes and a conductive material inside shape-adjusted carbon particles through spheroidization of carbon materials such as flake graphite, and thus, the contact area between the active material and the solidelectrolyte is increased, and the paths of ion conduction and electron conduction are extended and maintained to the inside of the active material particles.

Description

technical field [0001] This application claims the benefit of Korean Patent Application No. 10-2018-0059800 filed with the Korean Intellectual Property Office on May 25, 2018, the disclosure of which is incorporated herein by reference. The present invention relates to composite particles for negative electrode active materials and an electrochemical device including the composite particles. The electrochemical device of the present application is specifically an all-solid-state battery using a solid electrolyte. Background technique [0002] Lithium-ion batteries using liquid electrolytes have a structure in which the anode and cathode are separated by a separator, and when the separator is damaged due to deformation or external impact, a short circuit may occur, resulting in overheating or explosion. In order to solve the above-mentioned problems, solid electrolyte materials using ion-conductive polymers or inorganic substances and all-solid-state batteries using the soli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0562H01B1/10
CPCH01M4/587H01M4/62H01M10/0562H01M4/364H01M4/583H01M4/624H01M2004/027H01M4/366H01B1/10H01M2300/0068H01M2300/0071H01M10/0525H01M2004/021H01M2220/20
Inventor 安炳勋金炅泽金奇泰田粲秀崔相勋
Owner LG ENERGY SOLUTION LTD