Method for improving battery cycle performance and electronic device

A battery cycle and battery charging technology, applied in battery circuit devices, circuit devices, secondary battery charging/discharging, etc., can solve the problems of unsatisfactory cycle capacity retention rate, aggravated cathode structure damage, and battery performance deterioration, etc., to improve The effect of high temperature cycling performance, reducing the interfacial reaction rate, and improving the cycling performance

Active Publication Date: 2020-12-18
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for lithium-ion batteries with lithium cobalt oxide system, the upper limit voltage of the cathode continues to increase, resulting in aggravated destruction of the cathode structure and increased side reactions.
[0003] The unsatisfactory cycle capacity retention rate of lithium-ion batteries under high temperature conditions (that is, high temperature cycle failure) is a common problem
At present, when the isolation film solves the problem of high-temperature cycle failure, the main method is to optimize the electrolyte formula, but the optimization of the electrolyte formula will bring about a certain degree of deterioration of other battery performance (such as low-temperature discharge, high-rate charge)

Method used

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  • Method for improving battery cycle performance and electronic device
  • Method for improving battery cycle performance and electronic device
  • Method for improving battery cycle performance and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 23

[0114] Embodiment 23 adopts the new charging method 2 in this application, and the specific process is as follows:

[0115] The ambient temperature is 55°C;

[0116] Step 1: Charge the battery to 4.4V with a constant current of 0.7C;

[0117] Step 2: Charge the battery to 0.4C with a constant voltage of 4.35V;

[0118] Step 3: Charge the battery to 0.13C with a constant voltage of 4.45V;

[0119] Step 4: Let the battery stand for 5 minutes;

[0120] Step 5: Discharge the battery to 3.0V with a constant current of 0.5C;

[0121] Step 6: Let the battery stand for 5 minutes;

[0122] Step 7: Cycle the above steps 1 to 6 500 times.

Embodiment 24

[0123] Embodiment 24 adopts the new charging method 3 in this application, and the specific process is as follows:

[0124] The ambient temperature is 55°C;

[0125] Step 1: Charge the battery to 4.4V with a constant current of 0.7C (2.1A);

[0126] Step 2: Charge the battery to 4.45V with a constant power of 7W;

[0127] Step 3: Charge the battery to 4.55V with a constant power of 5.5W;

[0128] Step 4: Let the battery stand for 5 minutes;

[0129] Step 5: Discharge the battery to 3.0V with a constant current of 0.5C;

[0130] Step 6: Let the battery stand for 5 minutes;

[0131] Step 7: Cycle the above steps 1 to 6 500 times.

Embodiment 25

[0132] Embodiment 25 adopts the new charging method 4 in this application, and the specific process is as follows:

[0133] The ambient temperature is 55°C;

[0134] Step 1: Charge the battery to 4.4V with a constant current of 0.7C;

[0135] Step 2: Charge the battery to 0.5C with a constant voltage of 4.4V;

[0136] Step 3: Charge the battery to 4.45V with a constant current of 0.5C;

[0137] Step 4: Charge the battery to 0.3C with a constant voltage of 4.45V;

[0138] Step 5: Let the battery stand for 5 minutes;

[0139] Step 6: Discharge the battery to 3.0V with a constant current of 0.5C;

[0140] Step 7: Let the battery stand for 5 minutes;

[0141] Step 8: Cycle the above steps 1 to 7 for 500 circles.

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Abstract

The invention provides a method for improving the cycle performance of a battery, the method is applied to the battery, the battery comprises a positive plate, a negative plate and an isolating membrane arranged between the positive plate and the negative plate, the adhesive force between the isolating membrane and the positive plate or the negative plate is greater than or equal to 3N/m, and themethod comprises the following steps: in a first stage, separating the positive plate and the negative plate from each other; charging the battery with the first-stage current to a first-stage voltage; and in a second stage, charging the battery to a second-stage voltage with a second-stage current, the second-stage voltage being greater than the first-stage voltage, and the second-stage current being less than the first-stage current. The invention further provides an electronic device. According to the method provided by the invention, the cycle performance of the battery in a high-temperature environment can be remarkably improved.

Description

technical field [0001] The present application relates to the technical field of batteries, in particular to a method and an electronic device for improving battery cycle performance. Background technique [0002] In recent years, with the popularization and application of consumer lithium-ion batteries, continuous iterative development of the lithium-ion batteries has gradually increased the energy density of the lithium-ion batteries. Especially for lithium-ion batteries based on lithium cobalt oxide, the upper limit voltage of the cathode continues to increase, resulting in aggravated destruction of the cathode structure and increased side reactions. [0003] The unsatisfactory cycle capacity retention rate of lithium-ion batteries under high temperature conditions (that is, high temperature cycle failure) is a common problem. At present, when the isolation film solves the problem of high-temperature cycle failure, the main method is to optimize the electrolyte formula, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/0525H01M2/16
CPCH01M10/44H01M10/0525Y02E60/10H01M50/449H01M50/443H01M50/414H01M10/425H01M10/48H01M50/461H02J7/0071H02J7/0069H02J7/007182H02J7/0042C09J7/29C09J2203/326C09J2409/00C09J2425/00C09J2427/00C09J2433/00H01M10/46H01M2220/30
Inventor 刘奥龚美丽高潮方占召
Owner NINGDE AMPEREX TECH
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