How many cycles does a lithium-ion battery actually have? With the increasing emphasis on energy conservation and environmental protection, more and more environmentally friendly products are being applied to the market. In the battery industry, lithium-ion batteries have rapidly captured the market and are gradually replacing traditional lead-acid batteries due to their numerous advantages. Compared to traditional batteries, lithium-ion batteries have advantages such as long lifespan, energy efficiency, environmental friendliness, low maintenance costs, complete charge and discharge, and light weight. But just how long is the lifespan of lithium-ion batteries?
How long is the lifespan of a lithium-ion battery?
The lifespan of a lithium-ion battery refers to the period after which its capacity decreases to 70% of its nominal capacity (at room temperature of 25°C, standard atmospheric pressure, and a 0.2C discharge rate). The industry generally calculates cycle life by the number of full charge-discharge cycles. During use, irreversible electrochemical reactions occur inside the lithium-ion battery, leading to capacity reduction. These reactions include electrolyte decomposition, deactivation of active materials, and the collapse of the positive and negative electrode structures, resulting in a reduction in the number of lithium ions inserted and extracted. Experiments show that higher discharge rates lead to faster capacity decay; conversely, lower discharge currents allow the battery voltage to approach the equilibrium voltage, releasing more energy.
The theoretical lifespan of lithium-ion batteries is approximately 800 cycles, which is moderate among commercially available rechargeable lithium-ion batteries. Lithium iron phosphate batteries have a lifespan of about 2000 cycles, while lithium titanate batteries are said to reach 10,000 cycles. Currently, mainstream battery manufacturers promise more than 500 cycles in their cell specifications; however, after cells are assembled into battery packs, due to consistency issues—importantly, voltage and internal resistance cannot be exactly the same—the actual cycle life is approximately 400 cycles. Xi'an Huamai has long been a manufacturer of lithium-ion battery packs.
What is a ternary lithium-ion battery? How long is the lifespan of a ternary lithium-ion battery?
In the battery industry, ternary lithium-ion batteries have rapidly captured the market and gradually replaced traditional lead-acid batteries due to their numerous advantages. Compared to traditional batteries, ternary lithium-ion batteries have advantages such as long lifespan, energy efficiency, environmental friendliness, low maintenance costs, complete charge and discharge, and light weight. Just how long is the lifespan of ternary lithium-ion batteries?
In nature, lithium is the lightest metal with the smallest atomic mass. Lithium is chemically reactive, readily losing electrons to be oxidized to Li+. Its standard electrode potential is -3.045V, and its electrochemical equivalent is 0.26 g/Ah. These characteristics determine that lithium is a material with very high specific energy. Ternary lithium-ion batteries are lithium-ion rechargeable batteries that use nickel, cobalt, and manganese transition metal oxides as cathode materials. They fully combine the excellent cycle performance of lithium cobalt oxide, the high specific capacity of lithium nickel oxide, and the high safety and low cost of lithium manganese oxide. By utilizing molecular-level mixing, doping, coating, and surface modification methods to synthesize composite lithium-intercalating oxides with synergistic effects of nickel, cobalt, and manganese, they are currently a widely researched and applied type of lithium-ion rechargeable battery.
The theoretical lifespan of ternary lithium-ion batteries is approximately 800 cycles, which is moderate among commercially available rechargeable lithium-ion batteries. Lithium iron phosphate batteries have a lifespan of about 2000 cycles, while lithium titanate batteries are said to reach 10,000 cycles. Currently, mainstream battery manufacturers promise more than 500 cycles (standard charge/discharge conditions) in their ternary cell specifications. However, after cells are assembled into battery packs, due to consistency issues—importantly, voltage and internal resistance cannot be completely identical—the cycle life is approximately 400 cycles. Manufacturers recommend a SOC (State of Charge) window of 10% to 90% and discourage deep charge/discharge, as this can cause irreversible damage to the positive and negative electrode structures. If calculated using shallow charge/discharge, the cycle life is at least 1000 cycles. Furthermore, if lithium-ion batteries are frequently discharged at high rates and high temperatures, their lifespan will drastically decrease to less than 200 cycles.
How long is the lifespan of a lithium-ion battery? How many cycles does a lithium-ion battery actually have?
Lithium-ion battery life
The lifespan of a lithium-ion battery depends on its quality and the materials used in its production.
1. The ternary material can be cycled approximately 800 times.
2. The lithium iron phosphate battery has a cycle life of approximately 2,500 times.
3. There is a difference in the number of cycles between genuine and defective batteries. Genuine batteries are designed and manufactured according to the number of cycles specified in the battery manufacturer's specifications, while defective batteries may sometimes have less than 50 cycles.
