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Formation method of aqueous iron-lithium battery

A technology of iron-lithium battery and formation method, applied in secondary batteries, electrochemical generators, secondary battery charging/discharging, etc. Test efficiency, maintain accuracy, and protect battery effectiveness

Active Publication Date: 2017-03-08
ZHEJIANG CASNOVO MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the irrationality of the existing lithium battery simulation cycle test method, the test efficiency is relatively low. For example, according to the conventional lithium battery simulation cycle test method, the test time needs half a year based on the cycle life of an ordinary lithium battery as 1000 times.
The industry is also trying to improve battery cycle test methods, such as using a larger current for charge-discharge cycles and reducing the rest time between charge and discharge. Although these methods can improve test efficiency and reduce test time, they will also damage the internal structure of the battery, which not only affects the test. Accuracy, and easy to damage the battery, the effect is not ideal

Method used

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  • Formation method of aqueous iron-lithium battery
  • Formation method of aqueous iron-lithium battery
  • Formation method of aqueous iron-lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: the formation method of water system lithium iron battery, specifically comprises the following steps;

[0024] (1) At an ambient temperature of 25±5°C, first charge at a constant current of 0.01C (that is, 0.01 times the rated current capacity, which is a technical term in this field) for 30 minutes, then charge at a constant current of 0.02C for 120 minutes, and then charge at a constant current of 0.05 C Constant current charging for 180min;

[0025] (2) Extract air from the battery, use conventional methods to extract air, seal the edge with the end of the air bag, reserve the air bag for secondary air extraction, and leave it at a constant temperature of 45°C for 24 hours after the air extraction;

[0026] (3) Charge with a constant current of 0.1C to 0.2C. When the battery terminal voltage reaches the charging limit voltage of 3.7V, change to constant voltage charging until the charging current is less than or equal to 1 / 20C;

[0027] (4) Air pumpin...

Embodiment 2

[0028] Embodiment 2: The applicant divides the same batch of batteries (the experimental battery model is LFP76173248-25AH, and the positive plate is obtained by an aqueous preparation method) into two groups during formation, one group is conventional formation method, and one group is according to the utility model. The method of formation is described, and 10 batteries are randomly selected to compare their electrical properties:

[0029]

[0030] It can be seen from the above table that the batteries prepared by the chemical synthesis method of the present invention are significantly better than those produced by the conventional chemical synthesis method in terms of 0.5C discharge capacity, first charge and discharge efficiency, constant current charge efficiency and 3.0 platform efficiency. The battery has an average increase of more than 4% in the first charge and discharge efficiency, an increase of more than 3% in the constant current charging efficiency, and an inc...

Embodiment 3

[0031] Embodiment 3: lithium battery simulated cycle test method, specifically comprises the following steps;

[0032] (1) Deep charge-discharge cycle; at an ambient temperature of 25±5°C, charge with a current that is 1 times the rated capacity, and when the terminal voltage of the battery reaches the charging limit voltage of 3.65V, change to constant voltage charging until the charging current is less than or When the current is equal to 1 / 20 times of the rated capacity, stop charging; put it aside for 3 minutes, then discharge it with a current of 1 times the rated capacity to the end voltage of 2.0V, after the discharge is completed, put it aside for 3 minutes;

[0033] (2) General charge-discharge cycle: Charge to 80% of the rated capacity with a constant current of 1 times, and then rest for 3 minutes, and then discharge at 1 times the current until the discharge capacity is 80% of the rated capacity, and rest for 3 minutes;

[0034] (3) Perform a deep charge-discharge ...

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Abstract

The invention discloses a formation method of an aqueous iron-lithium battery. The formation method particularly comprises the following steps: (1) firstly charging for 30 minutes with constant current of 0.01C, then charging for 120 minutes with constant current of 0.02C, and charging for 180 minutes with constant current of 0.05C; (2) exhausting air from a battery, and standing for 24 hours at a constant temperature of 45 DEG C after the exhausting; (3) charging with constant current of 0.1C-0.2C, and when the voltage at a battery end reaches a limited charge voltage 3.7V, carrying out constant-voltage charging until the charge current is smaller than or equal to 1 / 20C; and (4) exhausting air from the battery, and standing for 24 hours at the constant temperature of 45 DEG C after the exhausting, so as to finish the formation. According to the formation method, lithium ions can be effectively activated, and the battery capacity can be effectively increased; a compact, uniform and stable SEI film is formed, so that the life cycle of the battery is prolonged; furthermore, by virtue of two exhausting processes, the undesirable phenomenon of air expansion is avoided.

Description

technical field [0001] The invention relates to a method for forming an aqueous iron-lithium battery, which belongs to the field of lithium-ion battery production. Background technique [0002] With the increasing application of lithium batteries and the continuous updating of technology, in order to reduce costs and be more environmentally friendly, many battery manufacturers currently use LA series and newly developed carboxylated chitosan as the main raw material for the preparation of positive electrodes. Binder, slurry preparation method using deionized water pole piece preparation method. The conventional formation process of the existing water-based lithium iron battery is as follows: in an environment of 25±5°C, charge with a current of 0.05C-0.2C, and charge until 60%-70% of the rated capacity. Then, in the actual production process, the main electrical performance parameters such as capacity development and life cycle are lower than those of the oil system (the po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44
CPCH01M10/446Y02E60/10
Inventor 张前沈俊杰邵汉琦李娟
Owner ZHEJIANG CASNOVO MATERIALS