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How about ternary lithium battery
Essentially, lithium is the lightest metal with the smallest atomic mass, with an atomic weight of 6.94g/mol and ρ=0.53g/cm3. Since lithium is chemically active and easily loses electrons and is oxidized to Li+, the standard electrode potential is the most negative at -3.045V and the minimum electrochemical equivalent is 0.26g/Ah. High specific energy materials. Ternary LR41 battery refer to lithium secondary batteries that use nickel, cobalt and manganese triple transition metal oxides as positive electrode materials. Combining the excellent cycle performance of lithium cobalt oxide, the high specific capacity of lithium to nickel ratio, and the high safety and low cost of lithium manganate, nickel was synthesized using molecular-level mixing, doping, coating and surface modification methods. A complex lithium interlayer oxide containing several elements such as cobalt and manganese. It is a widely researched and applied lithium-ion rechargeable battery.
The life of the third lithium battery
The so-called lithium battery life means that after a period of use, the battery capacity will reduce to 70% of the nominal capacity (battery capacity at room temperature 25°C, standard atmospheric pressure and 0.2C discharge). In industry, cycle life is usually calculated by the number of cycles when a lithium battery is fully charged and discharged. During use, irreversible electrochemical reactions occur inside the lithium battery, thereby reducing its capacity, such as electrolyte decomposition, active material deactivation, positive and negative electrode structure collapse, and the number of lithium ions. Experiments show that the faster the discharge rate, the faster the capacity decreases, the lower the discharge current, the battery voltage reaches the equilibrium voltage, and more energy is released.
The theoretical life of ternary LR41 battery is about 800 times, which is the middle level of commercial rechargeable LR41 battery. Lithium iron phosphate has about 2000 cycles, and lithium titanate is said to reach 10,000 cycles. At present, mainstream battery manufacturers have promised more than 500 times of triple battery specifications (charging and discharging under standard conditions). However, after the battery pack is assembled into the battery pack, the resistance cannot be fully guaranteed due to consistency issues, voltage and internal resistance. The same, the cycle life is about 400 times. The manufacturer recommends that the window to enable SOC ranges from 10% to 90%, and atrial discharge is not recommended. Otherwise, irreversible damage may be caused to the battery's positive and negative electrode structures. In addition, when LR41 battery are frequently discharged in high temperature and high temperature environments, the battery life will be greatly shortened to less than 200 times.
The advantages and disadvantages of ternary LR41 battery
Ternary LR41 battery are relatively balanced in terms of capacity and safety, and are batteries with excellent overall performance. The main characteristics, advantages and disadvantages of these three metallic elements are:
Co3+: Reduce the mixing proportion of cations, stabilize the layer structure of the material, reduce the resistance value, increase the conductivity, and improve cycle and speed performance.
Ni2+: can increase the capacity of the material (increase the energy density of the material). Since the radii of Li and Ni are similar, too much Ni will cause lithium-nickel mixed discharge due to the potential of Li and the concentration of nickel ions in the lithium layer. The larger the lithium, the more difficult it is to deintercalate lithium in the layered structure, resulting in lower electrochemical performance. Mn4+: Not only can it reduce material costs, but it can also improve the safety and stability of materials. However, if the Mn content is too high, the spinel phase will easily appear and destroy the layer structure, thereby reducing the capacity and cycle damping.
High energy density is the biggest advantage of ternary LR41 battery. The voltage platform is an important indicator of battery energy density. It determines the basic efficiency and cost of the battery. The higher the voltage platform, the greater the specific capacity. An-time battery and three-material lithium battery on high-voltage platform have longer battery life. The discharge voltage platform of a single triple-effect lithium battery is only 3.7V, lithium phosphate is 3.2V, and lithium titanate is only 2.3V, so in terms of energy density, lithium iron phosphate, lithium manganate or lithium titanate is the absolute advantage . There is this
Poor safety and short cycle life are the main disadvantages of tri-LR41 battery, especially safety performance, which have become the main limiting factors for large-scale deployment and large-scale integrated applications. Many practical tests have shown that large three-way batteries are difficult to pass safety tests such as acupuncture and overcharging. Therefore, large-capacity batteries usually introduce more manganese and use lithium manganate. The cycle life of 500 times is in the middle of LR41 battery, so the most important application of 3-element LR41 battery is consumer electronics such as 3C digital products.
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