Charging method of electrochemical device, electronic device and readable storage medium

Pending Publication Date: 2020-11-17
DONGGUAN POWERAMP TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the strategy to improve the problem of high-temperature cycle gas production in lithium batteries with high-nickel cathode active materials is mainly to enhance the protection of the cathode through chemical system optimization, such as coating the surface of high-nickel cathode active materials and increasing the content of film-forming additives in the electrolyte, etc. However, the above strategy will be accompanied by the loss of kinetic performance, such as the increase in temperature rise of the lithium battery, the deterioration of low-temperature discharge performance, etc., and it can only delay the gas production to the greatest extent.

Method used

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  • Charging method of electrochemical device, electronic device and readable storage medium
  • Charging method of electrochemical device, electronic device and readable storage medium
  • Charging method of electrochemical device, electronic device and readable storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] Ambient temperature: 25°C; EC / PC content in electrolyte: 20wt%; positive electrode active material: LiNi 0.8 co 0.1 mn 0.1 o 2 ;Particle type: secondary particle; Dv50 / μm of positive electrode active material: 8.5; Electrode assembly structure: winding full tab structure (one tab for each layer of positive pole piece);

[0138] The charging and discharging process in the first cycle stage:

[0139] Step 1, using 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 step 1 to step 3 300 times, that is, perform 300 charge and dis...

Embodiment 2

[0165] Ambient temperature: 25°C; EC / PC content in electrolyte: 20wt%; positive electrode active material: LiNi 0.8 co 0.1 mn 0.1 o 2 ;Particle type: secondary particle; Dv50 / μm of positive electrode active material: 8.5; Electrode assembly structure: winding full tab structure (one tab for each layer of positive pole piece);

[0166] The charging and discharging process in the first cycle stage:

[0167] Step 1, using 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 step 1 to step 3 300 times, that is, perform 300 charge and dis...

Embodiment 4

[0200] Embodiment 4 is basically the same as Embodiment 1, except that the third cycle stage of Embodiment 4 includes 200 charge and discharge cycles, and the fifth cycle stage is omitted. The expansion rate of the electrochemical device after 700 cycles in Example 4 was 11%.

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Abstract

The invention discloses a charging method for an electrochemical device, and the method comprises the following steps at a first circulation stage, a charging stage of the first circulation stage is provided with a first cut-off voltage; and at a second cycle stage, the charging stage of the second cycle stage has a second cut-off voltage, the second cut-off voltage being less than the first cut-off voltage. According to the charging method of the electrochemical device, an electronic device and a readable storage medium provided by the invention, the risk of cyclic gas production of the electrochemical device can be effectively prevented, and the service life of the electrochemical device can be prolonged.

Description

technical field [0001] The present application relates to the technical field of electrochemical devices, and in particular to a charging method for an electrochemical device, an electronic device and a readable storage medium. Background technique [0002] Lithium-ion battery (Lithium-ion battery), also often called lithium battery, is an electrochemical device capable of charging and discharging. It has been widely used in consumer products, digital products, power products, medical and security fields. In lithium batteries, the high-nickel cathode active material system has the advantages of high energy density and high power density, but the problem of high-temperature cycle gas production is common in applications, mainly due to the high-nickel cathode active material during high-voltage charging and discharging. The phase transition is accompanied by violent expansion and contraction of the crystal lattice, which leads to the release of oxygen from the lattice, which ...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/44
CPCH02J7/007182H01M10/44Y02E60/10H01M10/446H01M10/48H01M2010/4271H01M10/425H01M4/525H01M2004/021H01M2004/028
Inventor 蔡阳声金娟李翔郭飞龙
Owner DONGGUAN POWERAMP TECH LTD
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