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Lithium metal battery charging and discharging method

A lithium metal battery, charging and discharging technology, applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve the safety problems of lithium metal negative electrodes such as broken sand, lithium metal battery capacity and coulombic efficiency decay , battery coulombic efficiency reduction and other issues, to achieve good results, prevent decomposition, reduce internal resistance

Pending Publication Date: 2022-07-29
安徽盟维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

[0003] Lithium metal anodes have attracted widespread attention due to their excellent performance, but it is not an easy task to apply lithium metal anodes in lithium-ion battery systems. The early commercialization of lithium metal anodes was due to the safety of lithium metal anodes. Halberd sinks into the sand
The reason is that the non-uniform lithium deposition during the charging process leads to the continuous growth of lithium dendrites, which eventually pierce the separator and cause a short circuit between the positive and negative electrodes.
In addition, the continuous side reaction between the metal lithium anode and the electrolyte during the cycle will lead to a significant decrease in the coulombic efficiency of the battery, and the huge volume expansion is another problem faced by the lithium metal anode. , the deposition of lithium metal on the negative electrode is not a dense structure, but a loose structure with many voids, the volume of the negative electrode continues to expand, and the internal resistance of the battery continues to increase, resulting in a rapid decline in the capacity and Coulombic efficiency of the lithium metal battery.
At present, the commercialization of lithium metal batteries as power batteries is not yet mature.

Method used

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  • Lithium metal battery charging and discharging method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] 1) Preparation of positive electrode sheet: under low dew point conditions (-40 °C), LiNi was prepared in NMP solvent. 0.8 Co 0.1 Mn 0.1 O 2 Mix evenly with conductive agent (SP) and adhesive (PVDF) in a weight ratio of 97:1.5:1.5, and stir at high speed in a vacuum to make a positive electrode slurry; evenly coat the slurry on 10 μm aluminum foil to prepare a positive electrode slurry. The pole piece is dried in a vacuum environment of 85 ℃, and is cut into pieces by rolling to obtain a positive pole piece;

[0044] 2) preparation of negative electrode sheet: in the glove box full of argon, the lithium band is punched into a standard shape with a die-cutting machine, and its surface is polished and polished, and then rolled and flattened to obtain a negative electrode sheet;

[0045]3) Preparation of the battery cell: The prepared positive electrode sheet, the negative electrode sheet and the polyethylene separator with a thickness of 19 μm are laminated in turn to ...

Embodiment 1

[0047] 1) Heat the lithium metal battery to 40°C and let it stand for 40 minutes;

[0048] 2) Constant current discharge is performed on the lithium metal battery with a current of 0.09C until the voltage reaches 3.0V;

[0049] 3) Continue to discharge the lithium metal battery at a constant current with a current of 0.02C until the voltage reaches 2.9V;

[0050] 4) Between 2.9V and 3.0V, charge and discharge the lithium metal battery 3 times with a constant current of 0.02C;

[0051] 5) Charge the lithium metal battery with constant current and constant voltage at a current of 0.1C until the voltage reaches 4.3V;

[0052] 6) Between 4.3V and 4.4V, the lithium metal battery is subjected to pulse charge and discharge cycles for 3 times, the pulse action time is 10s, the interval time is 1s, and the pulse current is 0.05C;

[0053] 7) Between 3.0V and 4.3V, charge and discharge the lithium metal battery 3 times with a constant current of 0.1C;

[0054] 8) Let the battery cool...

Embodiment 2

[0056] 1) Heat the lithium metal battery to 45°C and let it stand for 40 minutes;

[0057] 2) Constant current discharge of the lithium metal battery with a current of 0.08C until the voltage reaches 2.95V;

[0058] 3) Continue to discharge the lithium metal battery at a constant current with a current of 0.01C until the voltage reaches 2.85V;

[0059] 4) Between 2.85V and 2.95V, charge and discharge the lithium metal battery 3 times with a constant current of 0.01C;

[0060] 5) Charge the lithium metal battery with a constant current and constant voltage at a current of 0.2C until the voltage reaches 4.25V;

[0061] 6) Between 4.25V and 4.35V, the lithium metal battery is subjected to pulse charge and discharge cycles for 3 times, the pulse action time is 10s, the interval time is 1s, and the pulse current is 0.04C;

[0062] 7) Between 2.95V and 4.25V, charge and discharge the lithium metal battery 3 times with a constant current of 0.2C;

[0063] 8) Let the battery cool d...

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Abstract

The invention discloses a lithium metal battery charging and discharging method which comprises the following steps: heating a formed lithium metal battery to 40 DEG C or above, standing, performing constant-current discharging on the battery until the voltage of the battery reaches a discharging cut-off voltage, and continuously performing constant-current discharging on the battery until the voltage of the battery reaches the discharging cut-off voltage, the battery is charged until the voltage of the battery reaches a first set voltage lower than a discharging cut-off voltage, then constant-current charging and discharging circulation is carried out on the battery between the first set voltage and the discharging cut-off voltage, and then constant-current and constant-voltage charging is carried out on the battery until the charging cut-off voltage is reached; and performing pulse charge-discharge circulation on the battery between the charge cut-off voltage and a second set voltage higher than the charge cut-off voltage, performing constant-current charge-discharge circulation on the battery between the charge cut-off voltage and the discharge cut-off voltage, and finally cooling the battery to room temperature. The method provided by the invention can increase the number of cycles of the lithium metal battery with high energy density, reduce internal resistance and ensure safe and effective work of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium metal batteries, and in particular relates to a charging and discharging method for lithium metal batteries. Background technique [0002] With the development of the electric vehicle industry, the requirements for the energy density of power batteries are also increasing, while the theoretical energy density of traditional lithium-ion batteries based on positive and negative materials is only 390Wh / kg. In the presence of active substances, the energy density limit is only 300Wh / kg. Therefore, it is very urgent for power batteries to develop and produce a system with a higher theoretical energy density to achieve a leap-forward improvement in battery energy density. [0003] Lithium metal anodes have attracted widespread attention due to their excellent performance, but the application of lithium metal anodes in lithium-ion battery systems is not a simple task. The early commercialization of lith...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCH01M10/44
Inventor 徐文善张跃钢周飞何俊孙亢温明明汪利萍张辉周莉莎
Owner 安徽盟维新能源科技有限公司
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