How many cycles does a lithium battery last?

With the advocacy of energy conservation and environmental protection in society, more and more environmentally friendly products have been applied to the market. In the battery industry, ternary lithium batteries quickly occupied the market with many advantages, and gradually replaced the traditional lead-acid batteries. For traditional batteries, ternary lithium batteries have the advantages of long life, energy saving, environmental protection and pollution-free, low maintenance cost, complete charge and discharge, light weight, etc. In general, the life of ternary lithium batteries is long, to what extent?

Ternary lithium battery

What is a ternary lithium battery?

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In nature, lithium is a light metal with small atomic mass. Its atomic weight is 6.94 g/mol and p=0.53 g/cm3. Lithium is a kind of material with high specific energy because of its active chemical properties and easy to lose electrons and be oxidized to Li+. Therefore, the standard electrode potential * is negative, which is -3.045V, and the electrochemical equivalent * is small, which is 0.26g/Ah. Ternary lithium batteries are lithium secondary batteries with nickel, cobalt and manganese oxide as cathode materials. It combines the good cycle performance of lithium cobalt oxide, the high specific capacity of lithium nickel oxide, the high safety and low cost of lithium manganate, and synthesizes nickel cobalt manganese oxide synergistically by means of molecular mixing, doping, coating and surface modification. Lithium ion rechargeable battery is widely studied and applied at present.

Lifetime of Ternary Lithium Batteries

The so-called lithium battery life refers to that after a period of time, the capacity of the battery decreases to 70% of the nominal capacity (room temperature 25 C, standard atmospheric pressure, and the capacity of the battery discharged at 0.2C), which can be regarded as the end of life. The cycle life of lithium batteries is usually calculated by the number of cycles in which lithium batteries are fully charged and discharged. In the process of using lithium batteries, irreversible electrochemical reactions will occur inside the batteries, which will lead to capacity degradation, such as the decomposition of electrolyte, inactivation of active materials, the collapse of positive and negative structures, which will lead to the reduction of lithium ion embedding and de-embedding, and so on. Experiments show that higher discharge rate will lead to faster capacity decay. If the discharge current is low, the battery voltage will approach the equilibrium voltage, which can release more energy.

The theoretical life of ternary lithium batteries is about 800 cycles, which is moderate in commercial rechargeable lithium batteries. Lithium iron phosphate is about 2,000 cycles, while lithium titanate is said to be able to reach 10,000 cycles. At present, the mainstream battery manufacturers promise more than 500 times in the specifications of ternary batteries (charging and discharging under standard conditions). However, after the batteries are packed into batteries, the cycle life of the batteries is about 400 times due to the consistency problem, mainly because the voltage and internal resistance can not be exactly the same. The manufacturer recommends that SOC use window be 10%~90%. Deep charge and discharge is not recommended. Otherwise, it will cause irreversible damage to the structure of positive and negative electrodes of batteries. If calculated by shallow charge and shallow discharge, the cycle life will be at least 1000 times. In addition, if lithium batteries are discharged regularly at high power and high temperature, the battery life will drop dramatically to less than 200 times.

 

ternary lithium batteries

 

The number of life cycles of lithium batteries is determined by the quality of batteries and the material of batteries.

1. The cycle times of ternary materials are about 800 times.

2. The cycle times of lithium iron phosphate batteries are about 2500.

3. There is a difference between the cycle times of genuine batteries and bad batteries. The cycle times of genuine batteries are designed and manufactured according to the cycle times of battery manufacturer's specifications, while the cycle times of bad batteries are sometimes less than 50 times.

Lifetime of Ternary Lithium Batteries

The so-called lithium battery life refers to that after a period of time, the capacity of the battery decreases to 70% of the nominal capacity (room temperature 25 C, standard atmospheric pressure, and the capacity of the battery discharged at 0.2C), which can be regarded as the end of life. The cycle life of lithium batteries is usually calculated by the number of cycles in which lithium batteries are fully charged and discharged. In the process of using lithium batteries, irreversible electrochemical reactions will occur inside the batteries, which will lead to capacity degradation, such as the decomposition of electrolyte, inactivation of active materials, the collapse of positive and negative structures, which will lead to the reduction of lithium ion embedding and de-embedding, and so on. Experiments show that higher discharge rate will lead to faster capacity decay. If the discharge current is low, the battery voltage will approach the equilibrium voltage, which can release more energy.

The theoretical life of ternary lithium batteries is about 800 cycles, which is moderate in commercial rechargeable lithium batteries. Lithium iron phosphate is about 2,000 cycles, while lithium titanate is said to be able to reach 10,000 cycles. At present, the mainstream battery manufacturers promise more than 500 times in the specifications of ternary batteries (charging and discharging under standard conditions). However, after the batteries are packed into batteries, the cycle life of the batteries is about 400 times due to the consistency problem, mainly because the voltage and internal resistance can not be exactly the same. The manufacturer recommends that SOC use window be 10%~90%. Deep charge and discharge is not recommended. Otherwise, it will cause irreversible damage to the structure of positive and negative electrodes of batteries. If calculated by shallow charge and shallow discharge, the cycle life will be at least 1000 times. In addition, if lithium batteries are discharged regularly at high power and high temperature, the battery life will drop dramatically to less than 200 times.

GEILIENERGY Power has long manufactured battery packs, ternary lithium batteries, lithium iron phosphate batteries, lithium iron manganate batteries, lithium ion batteries and so on. The product has a wide range of applications and high quality. GEILIENERGY dynamics battery brand in China.

In today's lithium battery market, ternary lithium batteries are widely used, moderate in terms of performance and low in terms of price. Therefore, the cost-performance ratio of ternary lithium batteries is * People always say that ternary lithium batteries have a long life. How long is it? Ternary polymer lithium batteries are lithium batteries using lithium nickel cobalt manganate (Li(NiCoMn)O 2) as cathode materials. The precursor products of ternary composite cathode materials are nickel salts, cobalt salts and manganese salts as raw materials. The proportion of nickel, cobalt and manganese in ternary polymer lithium batteries can be adjusted according to actual needs. The batteries using ternary materials as cathode materials are safe compared with lithium cobalt acid batteries, but When used on mobile phones (the cut-off voltage of mobile phones is generally around 3.4V), there will be a significant sense of capacity shortage.

 

Ternary lithium battery performance:

The material with balanced capacity and safety has better cycling performance than normal lithium cobalt oxide. The nominal voltage of lithium cobalt oxide battery is only 3.5-3.6V in the early stage due to technical reasons, which limits its range of use. But up to now, with the continuous improvement of formula and structure, the nominal voltage of battery has reached 3.7V, which has reached or exceeded the level of lithium cobalt oxide battery in capacity.

1. High voltage platform. Voltage platform is an important indicator of battery energy density, which determines the basic efficiency and cost of battery. Therefore, the selection of battery materials is of great significance. The higher the voltage platform is, the larger the specific capacity is. It is certain that the lithium batteries with the same volume, weight and even the same ampere-hour have the same endurance. The lithium batteries with the higher voltage platform have a longer endurance. The voltage plateau of ternary materials is obviously higher than that of lithium iron phosphate. The high wire can reach 4.2 volts and the discharge plateau can reach 3.6 or 3.7 volts.

2. High energy density

3. High Vibration Density

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