Modified carbon nanotubes, method for preparing same, negative electrode slurry and battery
AssigneeEve Power Co., Ltd.
InventorsXuan WEN, Fanfen LIU, Zhihang ZHOU, Lun JIN
Life of this patent
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Abstract
Modified carbon nanotubes, A method for preparing the same, a negative electrode slurry, and a battery are provided. The method includes: carboxylating carbon nanotubes; adding the carboxylated carbon nanotubes in a first mixed acid solution to obtain first inner wall-carboxylated carbon nanotubes; adding the first inner wall-carboxylated carbon nanotubes in a second mixed acid solution to obtain second inner wall-carboxylated carbon nanotubes; and mixing the second inner wall-carboxylated carbon nanotubes and a polyethylene glycol to obtain the modified carbon nanotubes.
Claims20
A method for preparing modified carbon nanotubes comprising steps of:
- adding carbon nanotubes in a nitric acid solution to react at 65° C. to 75° C. for 10 h to 14 h, followed by washing and drying to obtain carboxylated carbon nanotubes, wherein a mass fraction of HNO3 in the nitric acid solution is greater than or equal to 20%;
- adding the carboxylated carbon nanotubes in a first mixed acid solution to react for 10 h to 14 h, followed by washing and drying to obtain first inner wall-carboxylated carbon nanotubes, wherein the first mixed acid solution is a mixed solution of concentrated nitric acid and concentrated hydrochloric acid in a volume ratio of 1:2 to 5, a mass fraction of HNO3 in the concentrated nitric acid is 60% to 70%, and a mass fraction of HCl in the concentrated hydrochloric acid is 30% to 38%;
- adding the first inner wall-carboxylated carbon nanotubes in a second mixed acid solution, standing for 10 h to 14 h, followed by washing and drying to obtain second inner wall-carboxylated carbon nanotubes, wherein the second mixed acid solution is a mixed solution of concentrated sulfuric acid and concentrated hydrochloric acid in a volume ratio of 1:1 to 1.5;
- and
- mixing the second inner wall-carboxylated carbon nanotubes, a polyethylene glycol, a dispersing agent, and water to obtain a mixed system, controlling a pH of the mixed system to be 1 to 4, and reacting the mixed system under reflux in presence of nitrogen at 78° C. to 85° C. for 3 h to 5 h, followed by washing and drying to obtain the modified carbon nanotubes.
Modified carbon nanotubes prepared by steps of:
- adding carbon nanotubes in a nitric acid solution to react at 65° C. to 75° C. for 10 h to 14 h, followed by washing and drying to obtain carboxylated carbon nanotubes, wherein a mass fraction of HNO3 in the nitric acid solution is greater than or equal to 20%;
- adding the carboxylated carbon nanotubes in a first mixed acid solution to react for 10 h to 14 h, followed by washing and drying to obtain first inner wall-carboxylated carbon nanotubes, wherein the first mixed acid solution is a mixed solution of concentrated nitric acid and concentrated hydrochloric acid in a volume ratio of 1:2 to 5, a mass fraction of HNO3 in the concentrated nitric acid is 60% to 70%, and a mass fraction of HCl in the concentrated hydrochloric acid is 30% to 38%;
- adding the first inner wall-carboxylated carbon nanotubes in a second mixed acid solution, standing for 10 h to 14 h, followed by washing and drying to obtain second inner wall-carboxylated carbon nanotubes, wherein the second mixed acid solution is a mixed solution of concentrated sulfuric acid and concentrated hydrochloric acid in a volume ratio of 1:1 to 1.5;
- and
- mixing the second inner wall-carboxylated carbon nanotubes, a polyethylene glycol, a dispersing agent, and water to obtain a mixed system, controlling a pH of the mixed system to be 1 to 4, and reacting the mixed system under reflux in presence of nitrogen at 78° C. to 85° C. for 3 h to 5 h, followed by washing and drying to obtain the modified carbon nanotubes.
Dependencies are inferred from the claim text.