Carbon nanotube dispersion manufacturing method of the same and usage

• Main Author: YOO, KWANG HYUN
• Format: Patent
• Language: English; Korean
• Published: 22.04.2022
• Subjects: BASIC ELECTRIC ELEMENTS; CABLES; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS THEREOF; CONDUCTORS; ELECTRICITY; INORGANIC CHEMISTRY; INSULATORS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; METALLURGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PHYSICS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES; TESTING; THEIR RELEVANT APPARATUS; TRANSPORTING

The present invention relates to a carbon nanotube dispersion, a method for preparing the same and use of the carbon nanotube dispersion. The carbon nanotube dispersion according to the present invention is a dispersion including carbon nanotubes dispersed in a solvent, and satisfies a content of metal foreign materials including iron (Fe) element or cobalt (Co) element alone, or a combination thereof, of at most 1,000 ppm, as determined by inductively coupled plasma (ICP) light emission spectroscopy. According to the present invention, it is possible to provide a carbon nanotube dispersion having a controlled content of metal foreign materials by identifying the cause of metal foreign material inducing problems in a lithium ion battery fundamentally from a process for preparing a carbon nanotube dispersion as a raw material. In addition, the present invention provides a method for controlling the content of metal foreign materials in the process for preparing a dispersion. Therefore, it is possible to obtain a lithium ion battery having high capacity and showing a low drop in voltage in a charged state and under a high-temperature storage condition, i.e. having high reliability, in a simple manner without using a process for removing metal foreign material undesirably in a process for preparing a conductive material or in a process for manufacturing an electrode subsequently. 본 발명은 탄소나노튜브 분산액, 그 제조방법 및 용도에 관한 것으로, 용매 중에 분산된 탄소나노튜브를 포함하는 분산액으로, 유도결합플라즈마(Inductively Coupled Plasma, ICP) 발광분석법에 의해 측정되는 철(Fe) 원소 및 코발트(Co) 원소 중 선택되는 단독 또는 이들의 혼합물을 포함하는 금속이물의 함유량이 최대 1,000ppm을 만족하는, 탄소나노튜브 분산액을 제공함으로써, 리튬 이온 배터리에서 문제를 일으키는 금속이물에 대하여 근원적으로 raw material인 탄소나노튜브 분산액의 제조공정 중에서 그 원인을 규명함으로써 금속이물의 함량이 제어된 탄소나노튜브 분산액을 제공할 수 있고, 이를 분산액 제조공정 중에 제어하는 방법을 제공할 수 있음으로써, 이후로 도전재의 제조공정 및 전극 제조 공정 중에 불필요하게 금속이물을 제거하는 공정을 수반하지 않고도 간이하게, 고용량을 얻을 수 있고, 또한 충전 상태, 고온 보존 하에서 전압 강하가 적은, 즉 신뢰성이 높은 리튬 이온 배터리를 제공할 수 있는 발명을 개시한다.