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Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.
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release time:2025-03-07 Hits: Popular:AG11 battery
Anode Materials for Cylindrical Lithium - ion Batteries
Anode materials in cylindrical lithium - ion batteries are equally important as they accept lithium ions during charging. Graphite is the most commonly used anode material. Graphite has a layered structure, which allows lithium ions to intercalate (insert) between the layers. Its theoretical specific capacity is about 372 mAh/g. Graphite offers good electrochemical stability, low cost, and relatively low lithium - ion insertion potential. This low potential is crucial as it helps to achieve a high cell voltage when paired with appropriate cathode materials. However, the energy density of graphite - based anodes has limitations, which has led to the exploration of alternative materials.
Silicon is emerging as a promising anode material. Silicon has an extremely high theoretical specific capacity, up to 4200 mAh/g, which is more than ten times that of graphite. When lithium ions react with silicon, they form lithium - silicon alloys. This large capacity increase has the potential to significantly boost the energy density of cylindrical lithium - ion batteries. However, silicon also has major challenges. During the charging and discharging process, silicon undergoes large volume changes, which can cause cracking and pulverization of the material. This leads to a rapid loss of electrical contact and a decrease in battery cycle life. To overcome these issues, researchers are developing various strategies, such as using silicon nanoparticles, composite materials with graphite or other additives, and advanced electrode designs.
Another alternative anode material is lithium - titanate (Li₄Ti₅O₁₂). Li₄Ti₅O₁₂ has a spinel structure. It offers a high - rate performance and excellent thermal stability. The material has a relatively flat discharge voltage profile, which is beneficial for some applications. Unlike graphite, Li₄Ti₅O₁₂ does not form a solid - electrolyte interphase (SEI) layer as easily, which can improve the safety and cycle life of the battery. However, its specific capacity is lower than that of graphite, around 175 mAh/g, which may limit its use in applications where high energy density is the primary requirement.
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