Charging method of electrochemical device, electronic device and readable storage medium
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[0136] Example 1
[0137] Ambient temperature: 25℃; EC / PC content in electrolyte: 20wt%; Positive active material: LiNi 0.8 Co 0.1 Mn 0.1 O 2 ; Particle type: secondary particles; Dv50 / μm of positive active material: 8.5;
[0138] The charge-discharge process in the first cycle stage:
[0139] Step 1. Use a constant current of 1.5C to charge the electrochemical device 13 until the voltage of the electrochemical device reaches the cut-off voltage of 4.2V;
[0140] Step 2, using a constant voltage of 4.2V to charge the electrochemical device 13 until the current of the electrochemical device reaches the preset cut-off current (0.05C);
[0141] Step 3, using a preset discharge current to discharge the electrochemical device 13 to a preset discharge cut-off voltage;
[0142] Step 4: Repeat the above steps 1 to 3 300 times, that is, perform 300 charge-discharge cycles on the electrochemical device 13 .
[0143] The charge-discharge process in the second cycle stage:
[0144...
Example Embodiment
[0164] Example 2
[0165] Ambient temperature: 25℃; EC / PC content in electrolyte: 20wt%; Positive active material: LiNi 0.8 Co 0.1 Mn 0.1 O 2 ; Particle type: secondary particles; Dv50 / μm of positive active material: 8.5;
[0166] The charge-discharge process in the first cycle stage:
[0167] Step 1. Use a constant current of 1.5C to charge the electrochemical device 13 until the voltage of the electrochemical device reaches the cut-off voltage of 4.2V;
[0168] Step 2, using a constant voltage of 4.2V to charge the electrochemical device 13 until the current of the electrochemical device reaches the preset cut-off current (0.05C);
[0169] Step 3, using a preset discharge current to discharge the electrochemical device 13 to a preset discharge cut-off voltage;
[0170] Step 4: Repeat the above steps 1 to 3 300 times, that is, perform 300 charge-discharge cycles on the electrochemical device 13 .
[0171] The charge-discharge process in the second cycle stage:
[0172...
Example Embodiment
[0200] Example 4 is basically the same as Example 1, except that the third cycle stage of Example 4 includes 200 charge-discharge cycles and the fifth cycle stage is omitted. The expansion ratio of the electrochemical device after 700 cycles of Example 4 was 11%.
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