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Due to the different electrolyte materials used to form lithium-ion batteries, lithium-ion batteries are also divided into two types: ternary lithium-ion batteries and liquid lithium-ion batteries. The positive and negative electrode materials of ternary lithium-ion batteries are the same as those of liquid lithium-ion batteries, and the working principle of batteries is similar, but the electrolytes in them are different from each other. Ternary lithium batteries are lightweight, have strong energy storage capacity, good discharge performance, and can form various shapes, with a longer lifespan. The electrolyte of ternary lithium batteries is a solid electrolyte. Compared to the liquid electrolyte of liquid lithium-ion batteries, ternary lithium batteries can form various shapes to improve the specific capacity of the battery.

With the increasing global pollution, energy conservation and environmental protection have become a top priority for social development. Currently, China vigorously advocates environmental protection and has introduced some relevant policies. Therefore, there are more and more environmental protection equipment on the market. Including the reduction of gasoline vehicles, the market launch of new energy vehicles, and products such as power banks, all of which are environmentally friendly batteries. That is to say, lithium batteries. Compared to traditional lead-acid batteries, lithium batteries have the characteristics of short charging time, long cycle life, energy conservation, environmental protection, pollution-free, light weight, and long service life. It has a long lifespan, where does it grow to?

Under international unified standards, the lifespan of a battery is not expressed by time, but by the number of cycles, which is calculated as one complete discharge. Generally, lithium batteries have a lifespan between 300-500 cycles, while A-grade ternary batteries can reach up to 800 cycles. So choosing a good battery supplier will ensure the quality of the battery and prolong its service life.

What is the lifespan of ternary lithium batteries_ Analysis of the lifespan of ternary lithium batteries

What is the lifespan of ternary lithium batteries

If lithium-ion batteries are used in high-temperature environments, such as temperatures above 350C, the amount of electricity stored in the battery will continue to decrease, resulting in a longer lifespan of the battery compared to working at room temperature. Charging a battery in this high-temperature environment will cause significant damage to the battery, thereby affecting its lifespan. Even charging in a hot environment can cause varying degrees of damage to the battery, so it is advisable to avoid charging the battery in high temperature environments as much as possible. If the battery is charged in a low-temperature environment, such as below 40C, it can also cause damage to the battery.

If ternary lithium-ion batteries are not charged for a long time, their lifespan will be reduced. Ternary lithium-ion batteries require electrons to remain in a flowing state for a long time in order to achieve their ideal service life. The commercial production technology of ternary lithium-ion batteries worldwide is not very mature, and their current market share is not high.

The theoretical lifespan of ternary lithium batteries is about 800 cycles, which is considered moderate in commercial rechargeable lithium batteries. Lithium iron phosphate has about 2000 cycles, while lithium titanate is said to have up to 10000 cycles. At present, mainstream battery manufacturers promise to produce ternary battery cells with a specification of more than 500 cycles (charging and discharging under standard conditions). However, after the battery cells are assembled into battery packs, due to consistency issues, the voltage and internal resistance cannot be exactly the same, and their cycle life is about 400 cycles. The manufacturer recommends a SOC usage window of 10% to 90% and does not recommend deep charging and discharging, as it may cause irreversible damage to the positive and negative electrode structures of the battery. If calculated based on shallow charging and discharging, the cycle life should be at least 1000 times. In addition, if lithium batteries are frequently discharged at high rates and high temperatures, their lifespan will significantly decrease to less than 200 times.

In nature, lithium is the lightest and least atomic weight metal, with an atomic weight of 6.94g/mol, ρ= 0.53g/cm3. Lithium has active chemical properties and is easily oxidized to Li+by losing electrons. Therefore, the standard electrode potential is the most negative, at -3.045V, and the electrochemical equivalent is the smallest, at 0.26g/Ah. These characteristics of lithium element determine that it is a material with high specific energy. Ternary lithium batteries refer to lithium secondary batteries that use nickel cobalt manganese transition metal oxides as cathode materials. It fully integrates the good cycling performance of lithium cobalt oxide, the high specific capacity of lithium nickel oxide, and the high safety and low cost of lithium manganese oxide. It uses molecular level mixing, doping, coating, and surface modification methods to synthesize composite lithium oxide with multi-element synergy, such as nickel cobalt manganese. It is currently a widely researched and applied lithium-ion rechargeable battery.

The so-called lifespan of a lithium battery refers to the capacity decay of the battery to 70% of its nominal capacity (at room temperature of 25 ℃, standard atmospheric pressure, and discharged at 0.2C) after a period of use, which can be considered as the end of its lifespan. The cycle life of lithium batteries is generally calculated based on the number of cycles they are fully charged and discharged in the industry. During use, irreversible electrochemical reactions occur inside lithium batteries, leading to a decrease in capacity, such as electrolyte decomposition, deactivation of active materials, collapse of positive and negative electrode structures, resulting in a decrease in the number of lithium ion insertion and deintercalation, and so on.

At present, the market price of ternary lithium-ion batteries is higher than that of liquid lithium-ion batteries. Compared to liquid lithium-ion batteries, their lifespan is long and their safety performance is good. It is believed that there will be a lot of room for improvement in the near future.

According to the current technological level of ternary lithium batteries, if used properly, they can be used in electric vehicles for at least 5 years. If used improperly, the lifespan of 2-3 years of lithium batteries will be depleted.

The so-called appropriate use mainly depends on whether the principle of shallow filling and shallow placement can be followed, and not excessive use.

Introduction:

A ternary polymer lithium battery refers to a lithium battery that uses lithium nickel cobalt manganese ternary cathode materials as the positive electrode material. There are many types of positive electrode materials for lithium-ion batteries, mainly lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, ternary materials, lithium iron phosphate, etc. At present, ternary battery cells have replaced the previously widely used lithium cobalt oxide battery cells and are widely used in the field of notebook batteries.

Parameters of ternary polymer lithium batteries:

Nominal capacity: 1250mAh

Standard discharge continuous current: 0.2C

Maximum continuous discharge current: 1C

Discharge: -10~60 ℃

Product size: MAX9.5 * 35 * 52mm

Finished product internal resistance: ≤ 150m Ω

Lead wire model: National standard wire UL1007/24 #, wire length 55mm

Protection parameter: Overcharge protection voltage/4.325 ± 0.025V per string

Overdischarge protection voltage 2.5 ± 0.05V

Overcurrent value: 2-6A or 3-8A

Performance of ternary polymer lithium batteries:

A material that is relatively balanced in terms of capacity and safety, with better cycling performance than normal lithium cobalt oxide. In the early stage, due to technical reasons, its nominal voltage was only 3.5-3.6V, which was limited in terms of usage range. However, so far, with the continuous improvement of formula and structure, the nominal voltage of the battery has reached 3.7V, which has reached or exceeded the level of lithium cobalt oxide batteries in terms of capacity.

Status of ternary polymer lithium batteries:

The world's top 5 battery cell brands, SANYO, PANASONIC, SONY, LG, and SAMSUNG, have launched ternary material batteries. A considerable number of notebook battery lines have replaced their previous lithium cobalt oxide batteries with ternary material batteries. In terms of cylindrical batteries, SANYO and SAMSUNG have completely ceased production of lithium cobalt oxide batteries and shifted to the manufacturing of ternary batteries. Currently, most small high rate power batteries at home and abroad use ternary cathode materials.

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