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US 2026/0200739 A1Published application
Carbon nanotubes and method for purifying same, carbon nanotube dispersion, binder composition, electrode composition, and secondary cell
Assigneesartience Co., Ltd., Toyocolor Co., Ltd.
InventorsYuki MATSUSHITA, Tomoaki MASUOKA, Yuma NONOYAMA
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Abstract
The disclosure provides: carbon nanotubes capable of forming an electrode film having good conductivity while further enhancing safety, and a method for purifying the carbon nanotubes; and a carbon nanotube dispersion, a binder composition, an electrode composition, and a secondary cell containing the carbon nanotubes.
Claims12
Carbon nanotubes, satisfying the following (1) to (3) and comprising multi-walled carbon nanotubes:
- (1) in differential thermal analysis when heated from 200° C. to 1000° C. at a rate of 10° C./minute, an exothermic peak is observed between 600° C. and 800° C. inclusive;
- (2) in a Raman spectrum, when the maximum peak intensity within a range of 1560 to 1600 cm−1 is defined as G, and the maximum peak intensity within a range of 1310 to 1350 cm−1 is defined as D, a G/D ratio is 0.5 or more and 3.0 or less;
- and
- (3) a total content of cobalt, iron, copper, zinc, nickel, chromium, manganese and molybdenum is 5000 ppm or less.
1 more element
A method for purifying carbon nanotubes, comprising:
- a first process of heat treating carbon nanotubes comprising multi-walled carbon nanotubes under an inert atmosphere at a temperature of 1000° C. or higher and 2000° C. or lower;
- and a second process of contacting the carbon nanotubes heat-treated in the first process with an acid, and
- the first process and the second process being each performed once or twice or more, and the acid having a standard electrode potential of 0.8 V vs. SHE or less.
Dependencies are inferred from the claim text.