Research directions and progress of negative electrode materials for 18650 battery 2500mah

　　Research directions and progress of anode materials for 18650 battery 2500mah. Anode materials play a vital role in 18650 battery 2500mah, so research on anode materials has become a hot topic in recent years. Most of the existing 18650 battery 2500mah do not have the advantages of high specific capacity, high charging efficiency, and long cycle life. The actual capacity is far from the theoretical capacity. Therefore, technological innovation is very urgent, and new types of batteries with excellent performance are developed. Lithium-ion battery electrode materials are currently the focus of researchers' efforts.

　　Research direction of negative electrode materials for 18650 battery 2500mah

　　Anode materials are one of the key factors that determine the performance of 18650 battery 2500mah. Currently, the anode materials used in commercial 18650 battery 2500mah mainly include: ① graphite-like carbon materials, which are divided into natural graphite and artificial graphite; ② disordered carbon materials, including hard carbon and soft carbon; ③ lithium titanate materials; ④ silicon-based materials, mainly divided into carbon-coated silicon oxide composite materials, nano-silicon carbon composite materials, and amorphous silicon alloys.

　　With the rapid development of the economy, science and technology are changing with each passing day, and the popularity of electronic products has reached the highest level in history. The development of electric vehicles, one of the important application fields, has led to the improvement of battery performance and also put forward higher requirements for batteries, including the improvement of energy density and the extension of cycle life. Current research on anode materials focuses on new carbon materials, silicon-based materials, tin-based materials and their oxide anode materials.

　　New carbon materials are compared to traditional carbon materials. Graphite, a traditional carbon material, is currently commonly used commercially as anode material for 18650 battery 2500mah. However, its theoretical capacity is low and it is increasingly unable to meet the development needs of 18650 battery 2500mah. New carbon materials, such as carbon nanotubes and graphene, have great potential in lithium-ion battery applications due to their special one- and two-dimensional flexible structures and excellent thermal and electrical conductivity.

　　Compared with other lithium battery anode materials, silicon-based anode materials have very high specific capacities. However, the high expansion rate of silicon during charge and discharge limits its application in negative electrode materials. Negative electrode materials prepared by composites of silicon and other materials can overcome this defect to a certain extent.

　　Metal tin and lithium can undergo alloying reactions to form a variety of intermetallic compounds LixSn (x=0.4, 1.0, 2.33, 2.5, 2.6, 3.5, 4.4), which is a promising negative electrode material for lithium ion batteries.

　　Research progress of anode materials for 18650 battery 2500mah

　　High-quality petroleum coke, represented by needle petroleum coke, has a series of advantages such as low thermal expansion coefficient, low porosity, low sulfur, low ash, low metal content, high conductivity and easy graphitization, so it is regarded as high-quality lithium ion Battery negative electrode material raw materials.

　　Although silicon-based anode materials are considered to be the next generation lithium-ion battery anode materials with broad application prospects due to their high specific capacity and other advantages, their commercial application is not smooth. The huge volume change caused during the charging and discharging process not only changes the material structure, but also brings a variety of negative effects, causing rapid battery failure.

　　Research on the modification of silicon-based anode materials mainly focuses on three aspects: how to solve the volume effect, maintain the stability of the SEI film, and improve the first Coulombic efficiency. The measures that have been reported so far mainly include: nanostructured silicon and its dimensional design, silicon composite materials and its structural design, new binders, new electrolytes/electrolyte additives, and pre-lithiation.

　　In the battery cost, negative electrode materials account for about 5%-15% and are one of the important raw materials for 18650 battery 2500mah. With the continuous improvement of technology, carbon negative electrode materials are no longer the only option. Lithium metal negative electrodes, lithium titanate negative electrodes, alloy negative electrodes, etc., some of the applications of these materials are not yet perfect, but they are all developing towards high capacity, high cycle times, and high discharge rates of 18650 battery 2500mah.

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