The easiest way to activate dead lithium batteries on mobile

The mobile phone battery cannot be charged, the reason is that the mobile phone lithium battery is over-discharged, the mobile phone battery is "starved" to death, and the phenomenon of dead battery occurs.

If the machine can't be turned on and cannot be charged, it needs to be activated at this time!

First of all, the so-called lithium battery starvation is the phenomenon that the battery cannot be recharged when the battery has been dead or the battery is very low.

The easiest way to activate dead lithium batteries on mobile.jpg

There are two ways to activate the current I know:

1. Use the universal charger and charge the phone for about 20 minutes to activate.

2. To the mobile phone repair shop, the mobile phone repair shop has more professional voltage instruments, such as using a 12-volt power supply to activate the dead battery of the mobile phone.

Specific operation guide: put the positive and negative poles of the 12V power supply on the positive and negative poles of the lithium battery of the mobile phone (the positive pole is opposite to the positive pole, and the negative pole is opposite to the negative pole), energize it for tens of seconds or even a few minutes, and connect it with a high 12V high voltage The dead battery of the mobile phone (the full voltage of the mobile phone battery is 4.2V, and the no-load voltage is 3.2v)! Finally, after activation, it can be charged with direct charging as before, and the activated lithium battery of the mobile phone has no effect on the lifespan.

Extended reading:

How to use your phone to extend battery life?

Nowadays, all the mobile phones we use are lithium batteries. We try to use fragmented time charging as much as possible, instead of plugging the mobile phone into the power supply for a long time, and shallow charging and shallow discharging is more conducive to protecting the battery.

Don't charge the phone too full when charging, generally more than 90% is almost the same, overcharging will damage the battery.

Don't use the battery's power until it is completely exhausted and recharge it. The loss of the battery is also very large in the case of no power. 20% is recommended to charge.

Safety Note:

Do not use the mobile phone while charging for a long time. It is necessary to maintain the high-frequency charging and discharging process of the mobile phone battery so that the mobile phone lithium battery can remain active and avoid dead batteries.

Do not charge for a long time. For example, when you go to bed at night, keep the phone in a recharging state, which may easily lead to overcharging of the phone or potential safety hazards.

As for the frequency of use and battery replacement, I think it is enough to charge it when it is out of power, and there is no need to think about replacing the battery. Nowadays, people will change their mobile phones after being dead for more than three years. If they are used normally, a battery can survive that time.

Mobile phone lithium battery knowledge

Lithium batteries for mobile phones are specifically called ternary lithium batteries. Almost all lithium batteries for communication (mobile phone) digital electronic products are ternary lithium batteries. New energy vehicles also use ternary lithium batteries in a large proportion. Learn more about lithium batteries , can avoid your phone from dead battery.

Ternary lithium battery life and advantages and disadvantages

What is a ternary lithium battery?

In nature, lithium is the lightest metal with the smallest atomic mass, its atomic weight is 6.94g/mol, ρ=0.53g/cm3. Lithium is chemically active, and it is easy to lose electrons and be oxidized to Li+. Therefore, the standard electrode potential is the most negative, which is -3.045V, and the electrochemical equivalent is the smallest, which is 0.26g/Ah. Materials with high specific energy.

Ternary lithium battery refers to a lithium secondary battery using three transition metal oxides of nickel, cobalt and manganese as positive electrode materials.

It fully integrates the good cycle performance of lithium cobaltate, the high specific capacity of lithium nickelate, and the high safety and low cost of lithium manganate. It uses molecular level mixing, doping, coating and surface modification to synthesize nickel. Cobalt manganese and other multi-element synergistic composite lithium intercalation oxides. It is a lithium-ion rechargeable battery that has been widely researched and applied.

Ternary lithium battery life

The so-called lithium battery life means that after the battery has been used for a period of time, the capacity decays to 70% of the nominal capacity (the capacity of the battery at room temperature 25°C, standard atmospheric pressure, and the battery capacity discharged at 0.2C), which can be considered as the end of life. In the industry, the cycle life is generally calculated by the number of cycles of full discharge of lithium batteries. In the process of use, irreversible electrochemical reactions will occur inside the lithium battery, resulting in a decrease in capacity, such as the decomposition of the electrolyte, the deactivation of active materials, and the collapse of the positive and negative structures, resulting in a reduction in the number of lithium ions intercalated and deintercalated, etc. . Experiments have shown that a higher rate of discharge will lead to faster capacity decay, and if the discharge current is lower, the battery voltage will be close to the equilibrium voltage and more energy can be released.

The theoretical life of a ternary lithium battery is about 800 cycles, which is medium among commercial rechargeable lithium batteries.

The lithium iron phosphate battery is about 2,000 cycles, while the lithium titanate battery can reach 10,000 cycles.

At present, mainstream battery manufacturers promise more than 500 times (charge and discharge under standard conditions) in their ternary battery specifications. The resistance cannot be exactly the same, and its cycle life is about 400 times. The manufacturer recommends that the SOC use window is 10%~90%. It is not recommended to perform deep charging and discharging, otherwise it will cause irreversible damage to the positive and negative structure of the battery, and there will be a dead battery phenomenon (the battery cannot be charged). If calculated, the cycle life is at least 1000 times.

Special attention: If the lithium battery is often discharged in a high rate and high temperature environment, the battery life will be greatly reduced to less than 200 times.

Advantages and disadvantages of ternary lithium battery

The ternary lithium battery is relatively balanced in terms of capacity and safety, and is a battery with excellent comprehensive performance. The main functions and advantages and disadvantages of the three metal elements are as follows:

Co3+: Reduce cation mixed occupation, stabilize the layered structure of the material, reduce the impedance value, improve the electrical conductivity, and improve the cycle and rate performance.

Ni2+: It can improve the capacity of the material (increase the volume energy density of the material), and due to the similar radius of Li and Ni, too much Ni will also cause the dislocation phenomenon with Li to cause the mixed arrangement of lithium and nickel, and the concentration of nickel ions in the lithium layer The larger it is, the harder it is for lithium to be deintercalated in the layered structure, resulting in poor electrochemical performance.

Mn4+: Not only can reduce the material cost, but also can improve the safety and stability of the material. But too high Mn content will easily appear spinel phase and destroy the layered structure, reduce the capacity and decrease the cycle.

High energy density is the biggest advantage of ternary lithium batteries

The voltage platform is an important indicator of the energy density of the battery, which determines the basic performance and cost of the battery. The higher the voltage platform, the greater the specific capacity. Therefore, the battery with the same volume, weight, and even the same ampere-hour, has a higher voltage platform. Material Lithium battery lasts longer. The discharge voltage platform of the single ternary lithium battery is as high as 3.7V, the lithium iron phosphate is 3.2V, and the lithium titanate is only 2.3V. Therefore, from the perspective of energy density, the ternary lithium battery is higher than the lithium iron phosphate battery and the lithium manganate battery. Batteries or lithium titanate batteries have absolute advantages.

Poor safety and short cycle life are the main shortcomings of ternary lithium batteries

Safety performance has always been a major factor limiting its large-scale deployment and large-scale integration applications. A large number of actual measurements show that it is difficult for a ternary battery with a large capacity to pass safety tests such as acupuncture and overcharge, which is why more manganese is generally introduced into large-capacity batteries, or even mixed with lithium manganate. The cycle life of 500 times belongs to the middle and lower part of the lithium battery, so the main application field of ternary lithium battery is 3C digital and other consumer electronic products.