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What to do if the capacity of lithium batteries decreases? Repair method for lithium battery capacity decline. As far as the editor knows, the capacity of lithium-ion batteries will decrease to 80% to 85% after 300-500 charge and discharge cycles. To restore the initial endurance performance, a new battery must be replaced. Recently, it was claimed that researchers have invented a technology that can restore 95% of the capacity of lithium-ion batteries, while greatly reducing their waste and making them more environmentally friendly.

Repair method for lithium battery capacity decline

There are two common methods for repairing the capacity decline of lithium batteries: freezing method and overcharging and discharging method.

1. Freezing method

Wrap the old lithium battery of the phone that will automatically shut down tightly with cling film, and try to wrap it as snugly as possible. There are three layers inside and outside to ensure that the battery is in a vacuum state. Then, wrap three layers of newspaper outside the cling film to completely seal the lithium battery. Put it into the freezer layer of the refrigerator, and after 48 hours, take out the battery and remove the six layers of paper film wrapped around it one by one. The lithium battery did not experience surface expansion or deformation due to freezing. After cooling for a period of time, then charge.

2. Overcharging method

Thoroughly discharge the nearly scrapped lithium battery, then recharge and activate the battery. The specific method is to perform deep discharge on the phone, which is to achieve a deeper level of recharging by depleting internal energy, which requires some unconventional methods. Connect the phone to a low voltage small light bulb using a specific device, and the battery's internal power will be transferred to the small light bulb until it is fully discharged. Mobile phones need to slowly deplete their electrical energy through a lower voltage. Under normal circumstances, if the rated voltage of the phone is below 3.6 volts after being connected, it will automatically shut down After discharging, the recharged phone battery can be used for a longer period of time.

The above methods, whether effective or not, can only be temporary temporary temporary solutions. As long as the capacity of lithium batteries decreases, it is difficult to restore them to their original state. Therefore, if all methods are ineffective, it is more reliable to buy a new battery.

Professor Rachid Yazami from NTU claims that his invention can restore old lithium-ion batteries to 95% capacity within 10 hours, and can be repeated every few years on the same battery. This will greatly improve the lifespan of lithium-ion batteries used in electronic devices and electric vehicles, while greatly reducing waste and making lithium-ion batteries more environmentally friendly.

After this invention was published, industry giants such as Apple, Samsung, and Panasonic have expressed strong interest in it. The invention adds a third electrode between the two existing electrodes in each lithium-ion battery, which discharges residual lithium ions from one electrode to the other, thereby removing the "impurity content" that affects battery performance and prevents the battery from storing more electrons. This has been successfully tested on prototype smartphones. However, for battery manufacturers, this may not be a good news, as it is highly likely to intentionally delay the large-scale adoption of this technology.

The reasons for the decrease in lithium battery capacity

1. Aging and decline of battery cells.

2. Different self discharge rates lead to imbalanced battery capacity in series, ultimately resulting in a decrease in the capacity and durability of lithium batteries.

3. During the use and charging and discharging process of the battery, the phenomenon of "vulcanization" may occur, which affects the battery capacity. Battery vulcanization is manifested as: the battery itself has a low voltage, it will be fully charged after a while, and it will disappear after a discharge. The softening of the battery is manifested by the turbidity and blackening of the liquid inside the battery. The battery capacity decreases, and over time and over time, the lead powder falls off.

4. Improper charging during summer and winter seasons. The charging voltage of the battery is inversely proportional to the ambient temperature, so high temperatures in summer can cause lithium batteries to lose water due to overcharging, leading to battery bulging and deformation. Undercharging in winter leads to a decrease in driving mileage.

Repair methods for the capacity decline of lithium batteries in electric vehicles

There are generally two methods, repair machine repair and battery refurbishment. Batteries with issues such as broken grids, broken electrodes, and punctures cannot be repaired using a repair machine, and can only be repaired through refurbishment.

Lithium battery packs have different self discharge rates and inconsistent voltages. First, check which battery has a different voltage, and then replace it with a battery that has the same capacity, voltage, self discharge, and internal resistance as a normal lithium battery pack. Alternatively, use a lithium battery pack voltage differential balance repair device to solve the problem with just one click.

Summer charging should not be placed in a place exposed to direct sunlight or overcharged. In winter, when not in use for a long time, electric vehicles should be charged regularly, usually at least once a month.

The above is the method for repairing the capacity decline of lithium-ion batteries. The maximum capacity of lithium-ion batteries decreases with the increase of usage. The application of lithium-ion batteries largely depends on the stability of their charging and discharging cycles. Like other secondary batteries, capacity decline during the cycling process is inevitable.

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