Lithium battery life and impact factors analysis and new skills

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Factors affecting the use of lithium batteries

After the lithium battery leaves the factory, whether it is used or not, the use time of lithium battery is only in the first few years. Generally, lithium battery can be charged and discharged 300-500 times. The oxidation reaction of the lithium battery leads to the addition of resistance inside the lithium battery, which leads to the decrease of the battery capacity. Then the resistance of the electrolyzer will reach a certain point. Although the battery is fully charged at this time, the battery cannot release the stored power.

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Temperature and charging condition affect the aging speed of lithium battery. The reduction of battery capacity under the two parameters is compared below.

Temperature charge 40% charge 100%

After a year of 0 ° C capacity by 98% a year after the capacity by 94%

After a year of 25 ° C capacity by 96% a year after the capacity by 80%

After a year of 40 ° C capacity by 85% a year after the capacity by 65%

After a year of 60 ° C capacity 75% three months after the capacity by 60%

Thus, high charging conditions and added temperature accelerate the decline of battery capacity.

If possible, try to charge the battery to 40% in a cool place. This allows the battery to operate its own maintenance circuits over a long shelf life. If the battery is placed under high temperature after full charge, it will cause great harm to the battery.

Influence factor 1: discharge depth and rechargeable times

The number of charges is related to the depth of discharge.

Charging times * discharge depth = the number of complete charging cycles. The higher the number of complete charging cycles is, the longer the battery life is. The number of rechargeable times * discharge depth = the actual battery life (ignoring other factors).

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Influence factor 2: overcharge, overdischarge, and large charging and discharging current

Overcharging in any form of lithium-ion batteries can damage the battery's function and even pose safety risks.

Prevent deep discharges below 2V or 2.5v, which can permanently damage lithium-ion batteries. Internal metal plating may occur, which can cause a short circuit, making the battery unusable or unsafe. Most lithium-ion batteries have electronic circuits inside the battery pack that disconnect the battery if the battery voltage is below 2.5v, exceeds 4.3v, or if the battery current exceeds a predetermined threshold value during charging or discharging. Prevent large charging and discharging currents, which put too much pressure on the battery.

Factor 3: overheating or undercooling environment

Sub-zero temperatures can cause lithium-ion batteries to burn up as soon as an electronic device is turned on, while overheating can reduce the battery's capacity.

Influence factor 4: long time full power, no power condition

For some laptop lithium batteries, the battery voltage often exceeds the standard voltage of 0.1 volt, that is, from 4.1 v to 4.2 v, then the battery life will be halved, and then increased by 0.1 v, the use time will be reduced to 1/3 of the original; The more you charge the battery, the more it will wear out. When a lithium battery is in a state of low or no power for a long time, the resistance to the movement of electrons within it will be added, resulting in a reduced capacity of the battery. The lithium battery is best in the middle state of power, in which case the battery will last the longest.

Chemical engineering students at Michigan institute of technology have discovered an economical way to recycle lithium batteries, using a 1,000-year-old mineral-processing method, foreign media reported.

The team used two mining techniques to isolate the components of a lithium battery: the casing, foil data and anodic and cathodic coatings.

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The biggest advantage of this process is cheap price and energy saving. To make batteries from scratch, the recycled material is as good as the original, and cheaper.

The team saw an opportunity to use existing skills to address emerging challenges (scarce battery data, limited supply, high prices, etc.). They select standard gravity separation (gravity separation) skills, copper and aluminum separation, and then choose foam flotation restore key data, including: graphite, lithium and cobalt. Such mining skills were the cheapest available at the time, and the necessary infrastructure was in place.

To further advance the Research, the Innovation Hub at Michigan tech university has been financially supported by an epa grant of $1. Fifty thousand dollars. It can be seen that this skill has a certain promoting effect on the recycling of lithium battery.

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