What is the true cycle life of ternary lithium battery?

With the promoting of social energy conservation and environmental protection, more and more environmental protection products have been applied to the market. And in the battery industry, the ternary lithium battery with numerous advantages quickly occupies the market, and gradually replaces the traditional lead-acid battery. For conventional batteries, ternary lithium battery with long life, energy conservation and environmental protection no pollution, low maintenance cost, charge and discharge completely, light weight and so on advantages. It is always said that ternary lithium battery has long life. How long is the cycle life of ternary battery?

The ternary lithium battery

What is a ternary lithium battery?

In nature, lithium is light, small metal atomic mass * and its atomic weight of 6.94 g/mol, rho = 0.53 g/cm3.Lithium chemistry and lively, easy to lose electrons are oxidation of Li +, so the standard electrode potential negative, is 3.045 V, the electrochemical equivalent * small, 0.26 g/Ah, these characteristics of lithium determines it is a very high specific energy of materials. Ternary lithium battery refers to the three transition metal nickel cobalt manganese oxide as the anode material of lithium secondary battery. It fully integrated the nickel cobalt acid lithium good cycle performance, high capacity of acid lithium and lithium manganese acid of high security and low cost etc., using molecular hybrid, doping, coating and surface modification methods such as synthesis of nickel cobalt manganese compound lithium oxide embedded multi-element synergy. Is now widely research and application of a lithium ion rechargeable battery.

The ternary lithium battery life

Lithium battery life refers to the battery in use after a period of time, capacity attenuation for the nominal capacity (room temperature 25 ℃, standard atmospheric pressure, and in the battery capacity of 0.2 C discharge) of 70%, can think life is terminated. In the industry generally to lithium battery full cycle times to calculate the cycle of life. In the process of using, lithium battery irreversible electrochemical reactions can occur within the led to the decrease of the capacity, such as the electrolyte decomposition, the inactivation of active material, is the collapse of the cathode structure embedded in lithium ion and reduce the number of embedded off and so on. Experiments indicate that leads to a higher ratio of discharge capacity attenuation, faster if the discharge current is low, the battery voltage will close to balance, can release more energy.

Ternary lithium batteries, the theory of life about 800 cycles in the commercialization of rechargeable lithium batteries belong to medium. lithium iron phosphate is about 2000 times, and lithium titanate reportedly can reach 10000 cycles. The current mainstream of battery manufacturers in the production of three yuan batteries specifications promised more than 500 times in the book (under the condition of standard charge and discharge), but the batteries in group with battery pack after due to the consistency problem, mainly is the voltage and internal resistance can't be exactly the same, the cycle life of about 400 times. Manufacturers recommend using SOC window is 10% ~ 90%, it is not recommended for deep cycles, or you will to cause irreversible damage to the battery is the cathode structure, if can be calculated by shallow filling, cycle life of at least 1000 times. In addition, the lithium battery if often to devolve electricity at high rate and high temperature environment, the battery life can break down to less than 200 times.

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