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Active lithium excitation method and application of lithium battery with supplemented lithium pole piece

A lithium battery and lithium supplement technology, which is applied in secondary batteries, electrochemical generators, secondary battery repair/maintenance, etc., can solve the problems affecting the effective improvement and delayed performance of the battery cycle life, and achieve quantitative release , increase capacity and prolong service life

Pending Publication Date: 2022-07-12
LISHEN (QINGDAO) NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for lithium-ion batteries, the supplemented active lithium has a delayed performance due to polarization, which affects the effective improvement of the cycle life of the battery cell.

Method used

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  • Active lithium excitation method and application of lithium battery with supplemented lithium pole piece

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Using the method of supplementing lithium with the negative electrode sheet, the designed lithium supplementing negative electrode sheet and the positive electrode (normal positive electrode, without lithium supplementation) are assembled into a square soft pack battery. The fabricated battery is charged at 2.5-3.65V (ie, the formation voltage) to realize formation and exhaust. After 7 days of high temperature aging, the prepared cells were subjected to a cycle test. Default for the following systems: discharge first, then charge.

[0080] At the beginning of the cycle, 3 cells with the same scheme were left for 5 hours in a 25°C incubator, and the temperature difference between the inside and outside of the cells was zero. The charging and discharging is carried out in the mode 1, and the specific mode requirements are: the charging and discharging voltage range is 2.5-3.65V, the charging rate is 1C, and the discharge rate is 1C;

[0081] When the number of cycles is...

Embodiment 2

[0090] The designed lithium-supplemented negative electrode and the positive electrode are assembled into a square soft pack battery by using the negative electrode sheet to supplement lithium. The fabricated battery is charged at 2.5-3.65V (ie, the formation voltage) to realize formation and exhaust. After 7 days of high temperature aging, the prepared cells were subjected to a cycle test. Default for the following systems: discharge first, then charge.

[0091] At the beginning of the cycle, 3 cells with the same scheme were left for 5 hours in a 25°C incubator, and the temperature difference between the inside and outside of the cells was zero. The charging and discharging is carried out in the mode 1, and the specific mode requirements are: the charging and discharging voltage range is 2.5-3.65V, the charging rate is 1C, and the discharge rate is 1C;

[0092] When the number of cycles is 100 times, the charging and discharging at 25°C is carried out in formula 2. The spe...

Embodiment 3

[0101] The designed lithium-supplemented negative electrode and the positive electrode are assembled into a square soft pack battery by using the negative electrode sheet to supplement lithium. The fabricated battery is charged at 2.5-3.65V (ie, the formation voltage) to realize formation and exhaust. After 7 days of high temperature aging, the prepared cells were subjected to a cycle test. Default for the following systems: discharge first, then charge.

[0102] At the beginning of the cycle, 3 cells with the same scheme were left for 5 hours in a 25°C incubator, and the temperature difference between the inside and outside of the cells was zero. The charging and discharging is carried out in the mode 1, and the specific mode requirements are: the charging and discharging voltage range is 2.5-3.65V, the charging rate is 1C, and the discharge rate is 1C;

[0103] When the number of cycles is 100 times, the charging and discharging at 25°C is carried out in formula 2. The spe...

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Abstract

The invention discloses an active lithium excitation method for a lithium battery with a supplemented lithium pole piece, which comprises the following steps of: 1, placing the lithium battery with the supplemented lithium pole piece in an incubator, and standing for a preset time length, so that the internal and external temperature difference of the lithium battery is zero; 2, in the use process of the lithium battery, counting the charge-discharge cycle times of the lithium battery in real time; 3, presetting a corresponding relationship between a plurality of preset different charge-discharge cycle times of the lithium battery and a plurality of systems; 4, detecting whether the charge-discharge cycle index of the lithium battery reaches a preset charge-discharge cycle index or not in real time, and performing charge-discharge cycle operation on the lithium battery once according to the system corresponding to the preset charge-discharge cycle index when the charge-discharge cycle index reaches the preset charge-discharge cycle index. And the active lithium supplemented in the lithium battery pole piece is periodically and dynamically excited and released. The active lithium supplemented on the lithium ion battery pole piece can be effectively excited, and the capacity of the battery is effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an active lithium excitation method and application of a lithium battery with a supplemented lithium pole piece. Background technique [0002] At present, lithium-ion batteries have been widely used in the fields of digital products, electric vehicles and energy storage due to their advantages of high energy density, good cycle performance, green and pollution-free. [0003] With the improvement of quality assurance requirements for energy storage batteries, the requirements for cell cycle life are also increased. The loss of active lithium during the cycle decay process of lithium-ion batteries is an important reason for affecting the cycle life of the battery. At present, supplementing the active lithium in the battery by supplementing lithium is an important improvement method. [0004] However, for lithium-ion batteries, the supplemented active lithium has a ph...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/44H01M10/48H01M10/0525
CPCH01M10/4235H01M10/44H01M10/48H01M10/0525Y02E60/10
Inventor 薛有宝万柳张凯博刘伯峥赵李鹏徐晓明曾涛
Owner LISHEN (QINGDAO) NEW ENERGY CO LTD
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