Electrolytic copper foil and preparation method therefor, negative electrode plate, secondary battery, battery module, battery pack and power consuming device

A method for preparing an electrolytic copper foil, comprising:

• placing an anode and a cathode to be plated in a twin crystal growth agent containing electroplating solution in an electroplating tank, wherein the twin crystal growth agent comprises one or two of a gelatin and polyethyleneimine;
• and
• under conditions that the electroplating solution is provided with randomly alternating transitions of one or two of an ultrasonic wave at a frequency f11 and an ultrasonic wave at a frequency f12 and one or two of an ultrasonic wave at a frequency f21 and an ultrasonic wave at a frequency f22, performing direct current electroplating to obtain the electrolytic copper foil, wherein 40 kHz<f11≤100 kHz, 15 kHz<f12≤40 kHz, 0 kHz<f21≤15 kHz, and f22=0 kHz;
• wherein during the electroplating to obtain the electrolytic copper foil:
• a percentage of a total time for electroplating under conditions of the ultrasonic wave at the frequency f11 and the ultrasonic wave at the frequency f12 is 70%-90%, and a percentage of a total time for electroplating under conditions of the ultrasonic wave at the frequency f21 and the ultrasonic wave at the frequency f22 is 10%-30%;
• and
• a number of ultrasonic transitions is 2 or more, and a number of ultrasonic transitions per minute is less than or equal to 25.