market. In the battery industry, ternary lithium battery with many advantages quickly occupied the market, and gradually replaced the traditional lead-acid battery. For traditional batteries, ternary lithium battery has the advantages of long life, energy-saving, environmental protection, no pollution, low maintenance cost, complete charge and discharge, lightweight, and so on?
Ternary lithium battery
What is a ternary lithium battery?
In nature, lithium is a light metal with a small atomic weight of 6.94g/mol, ρ= 0.53g/cm3。 The standard electrode potential * is negative, which is -3.045v, and the electrochemical equivalent * is small, which is 0.26g/ah. These characteristics of lithium determine that it is a material with a high specific energy. Ternary lithium battery is a kind of lithium secondary battery that uses three kinds of transition metal oxides of nickel, cobalt, and manganese as cathode materials. It fully integrates the good cycle performance of licoo4, the high specific capacity of licoo4, and the high safety and low cost of LiMn2O4, and uses the methods of molecular-level mixing, doping, coating, and surface modification to synthesize the composite lithium intercalation oxides with multi-elements such as nickel, cobalt, and manganese. It is a kind of lithium-ion rechargeable battery that is widely studied and applied at present.
Life of ternary lithium battery
The so-called lithium battery life refers to that after a period of use, the capacity of the battery decays to 70% of the nominal capacity (room temperature 25 ℃, standard atmospheric pressure, and discharge at 0.2C), which can be considered as the end of life. In the industry, the cycle life of a lithium battery is calculated by the number of cycles of full charge and discharge. In the process of use, irreversible electrochemical reactions will take place in the lithium battery, which will lead to the reduction of capacity, such as the decomposition of electrolyte, the deactivation of active materials, the collapse of the positive and negative electrode structure, which will lead to the reduction of the number of lithium-ion intercalation and deintercalation, and so on. Experiments show that a higher discharge rate will lead to faster capacity attenuation. If the discharge current is lower, the battery voltage will be close to the balance voltage, and more energy can be released.
The theoretical life of ternary lithium batteries is about 800 cycles, which is medium in commercial rechargeable lithium batteries. Lithium iron phosphate is about 2000 cycles, while lithium titanate is said to have 10000 cycles. At present, the mainstream battery manufacturers promise more than 500 times (charging and discharging under standard conditions) in the specifications of ternary cells produced by them. However, after the cells are assembled into battery packs, due to the consistency problem, the main reason is that the voltage and internal resistance can not be the same, and its cycle life is about 400 times. The manufacturer recommends that the SOC use window is 10% ~ 90%, and it is not recommended to conduct deep charge and discharge, otherwise, it will cause irreversible damage to the positive and negative structure of the battery. If it is calculated by shallow charge and shallow discharge, the cycle life will be at least 1000 times. In addition, if the lithium battery is often discharged at a high rate and high temperature, the battery life will be greatly reduced to less than 200 times.
The life cycle number of lithium batteries is determined by the quality and material of the battery:
1. The cycle times of ternary materials are about 800.
2. The lithium iron phosphate battery has about 2500 cycles.
3. There is a difference between the cycle times of genuine batteries and defective batteries. Genuine batteries are designed and produced according to the cycle times specified in the battery manufacturer's specifications, while the cycle times of defective batteries may sometimes be less than 50 times.
Life of ternary lithium battery
The so-called lithium battery life refers to that after a period of use, the capacity of the battery decays to 70% of the nominal capacity (room temperature 25 ℃, standard atmospheric pressure, and discharge at 0.2C), which can be considered as the end of life. In the industry, the cycle life of a lithium battery is calculated by the number of cycles of full charge and discharge. In the process of use, irreversible electrochemical reactions will take place in the lithium battery, which will lead to the reduction of capacity, such as the decomposition of electrolyte, the deactivation of active materials, the collapse of the positive and negative electrode structure, which will lead to the reduction of the number of lithium-ion intercalation and deintercalation, and so on. Experiments show that a higher discharge rate will lead to faster capacity attenuation. If the discharge current is lower, the battery voltage will be close to the balance voltage, and more energy can be released.
The theoretical life of ternary lithium batteries is about 800 cycles, which is medium in commercial rechargeable lithium batteries. Lithium iron phosphate is about 2000 cycles, while lithium titanate is said to have 10000 cycles. At present, the mainstream battery manufacturers promise more than 500 times (charging and discharging under standard conditions) in the specifications of ternary cells produced by them. However, after the cells are assembled into battery packs, due to the consistency problem, the main reason is that the voltage and internal resistance can not be the same, and its cycle life is about 400 times. The manufacturer recommends that the SOC use window is 10% ~ 90%, and it is not recommended to conduct deep charge and discharge, otherwise, it will cause irreversible damage to the positive and negative structure of the battery. If it is calculated by shallow charge and shallow discharge, the cycle life will be at least 1000 times. In addition, if the lithium battery is often discharged at a high rate and high temperature, the battery life will be greatly reduced to less than 200 times.
Juda lithium has long been manufacturing battery packs, ternary lithium batteries, lithium iron phosphate batteries, lithium iron manganate batteries, lithium-ion batteries, and so on. Our products have a wide range of applications and high quality. Xindong power is one of the top battery brands in China.
In today's lithium battery market, ternary lithium battery is widely used. It is moderate in performance and low in price. Therefore, the cost performance of ternary lithium batteries is very good. People always say that ternary lithium battery has a long life. How long is it? Ternary polymer lithium battery is a kind of lithium battery whose cathode material is Li (NiCoMn) O2. The precursor product of ternary composite cathode material is made of nickel salt, cobalt salt, and manganese salt. The proportion of nickel, cobalt, and manganese can be adjusted according to the actual needs. The battery with ternary material as a cathode material has high safety compared with lithium cobalt battery, but the voltage is too low, When used on a mobile phone (the cut-off voltage of the mobile phone is generally about 3.4V), there will be an obvious feeling of insufficient capacity.
Performance of ternary lithium battery:
The material with balanced capacity and safety has better cycling performance than normal lithium cobalt oxide. Due to technical reasons, its nominal voltage is only 3.5-3.6v in the early stage, which is limited in the scope of use. But 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 battery incapacity.
1. The voltage platform is high. The voltage platform is an important index of battery energy density, which determines the basic efficiency and cost of the battery. Therefore, it is of great significance for the selection of battery materials. The higher the voltage platform is, the larger the specific capacity is. The same volume, weight, and even the same ampere-hour batteries are sure. The ternary material lithium battery with a higher voltage platform has a longer range. The voltage plateau of the ternary material is obviously higher than that of LiFePO4, the high-speed wire can reach 4.2 V, and the discharge plateau can reach 3.6 or 3.7 v.
2. High energy density
3. High tap density
