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Method and application for testing metal impurity precipitation voltage in battery

A metal impurity and battery technology, which is applied in the field of metal impurity precipitation voltage testing in batteries, can solve the problems of increased risk of self-discharge battery leakage rate, inability to effectively precipitate metal impurities, long production cycle, etc., to reduce risk and The effect of self-discharging battery leakage rate, shortening production cycle, and improving precipitation rate

Active Publication Date: 2021-04-02
昆山聚创新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current lithium battery manufacturing enterprises do not conduct in-depth research on the precipitation potential of metal impurities and design the battery formation process in combination with the precipitation potential of metal impurities, but only rely on high temperature aging and room temperature aging to screen self-discharge cells
The disadvantages of this original process are: 1. Long production cycle and high cost; 2. It cannot guarantee the effective precipitation of metal impurities in the formation stage, which increases the risk of subsequent production processes and the leakage rate of self-discharge batteries.

Method used

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  • Method and application for testing metal impurity precipitation voltage in battery
  • Method and application for testing metal impurity precipitation voltage in battery
  • Method and application for testing metal impurity precipitation voltage in battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0067] The parameter condition of blank group and embodiment 1~4 (that is, four different experimental groups) is shown in Table 1, and test result is shown in Table 2 and Figure 5 and Figure 6 .

[0068] Table 1 blank group and the parameter condition of embodiment 1~4

[0069]

[0070] The initial precipitation voltage of metal impurity in table 2 embodiment 1~4 and the precipitation speed under different charge rates

[0071]

[0072]

[0073] Results and conclusions:

[0074] Figure 5 It is the potential curve of undoped metal three electrodes (blank group) at 0.05C charging rate. It can be seen from the figure that the potential of the positive electrode / reference electrode gradually increases with the charging process, from about 3100mV to 4400mV and tends to be stable; the potential of the negative electrode / reference electrode gradually decreases from 3100mV to about 200mV; the battery voltage (Positive pole / negative pole) is the difference between the...

Embodiment 5～7

[0080] See Table 3 for parameter conditions.

[0081] The parameter condition of table 3 embodiment 5~7

[0082]

[0083] Results and conclusions:

[0084] The cells were formed and aged at high temperature according to the process parameters in Examples 5-7. The self-discharge screening effect is as follows: the missed judgment rate of embodiment 5 is 0.05%; the missed judgment rate of embodiment 6 is 0.08%; the missed judgment rate of embodiment 7 is 0.12%. The data shows that high temperature aging ≥ 4 days can effectively control the self-discharge missed judgment rate within 0.1%, reducing the outflow of self-discharge cells.

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Abstract

The invention discloses a method for testing the metal impurity precipitation voltage in a battery and application of the method. The testing method includes the steps of preparing an experimental group positive plate and a blank group positive plate, doping a coating surface of the experimental group positive plate with metal impurities, preparing a total battery from the experimental group positive plate and the blank group positive plate, connecting a positive electrode and a negative electrode of the total battery with a formation device, connecting the positive electrode, the negative electrode and a reference electrode of the total battery with three voltage channels of positive electrode / negative electrode, positive electrode / reference electrode and negative electrode / reference electrode of a multi-channel voltage recorder, charging the total battery, testing potential curve graphs of the three different voltage channels of the total battery through the multi-channel voltage recorder, comparing the potential curve graphs of the total battery, and regarding the voltage at which the potentials of the positive electrode and negative electrode of a experimental group total battery rise or fall compared with those of a blank group total battery as the initial metal impurity precipitation voltage. By means of the testing method, the participation potentials of metal impuritiesof different compositions and the participation speeds at different ratios can be rapidly monitored.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a method for testing the precipitation voltage of metal impurities in batteries and an application thereof. Background technique [0002] Lithium-ion battery cathode materials have many production processes, and every link in the manufacturing process will have the risk of introducing metal foreign matter. When there are metal impurities such as iron (Fe), copper (Cu), zinc (Zn), nickel (Ni) in the positive electrode material, after the voltage in the formation stage of the battery reaches the oxidation-reduction potential of these metal elements, these metals will first The positive electrode is oxidized and then reduced to the negative electrode. When the metal element at the negative electrode accumulates to a certain extent, it will pierce the separator and cause the battery to self-discharge. However, if the voltage in the formation stage does not reach the oxid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B07C5/34B07C5/344
CPCB07C5/34B07C5/344
Inventor 朱琳李奎
Owner 昆山聚创新能源科技有限公司