Analysis of the current market situation of lithium-ion batteries

by:CTECHi     2021-07-07

As an important component, lithium-ion batteries have been widely used in consumer electronic products, such as mobile phones, laptops, digital cameras, and digital video cameras. At the same time, with the enhancement of mobile phone functions and the increase in communication information such as portraits and digital transmissions, the battery life has been shortened, and the lack of battery capacity has plagued the majority of consumers. Recently, research on moving objects such as high-performance electric vehicles and robots has progressed rapidly, but the lack of battery capacity greatly limits the process of practicality and popularization. At present, lithium-ion batteries using carbon (graphite) as the negative electrode material have been widely used in high-end consumer electronics. Its theoretical capacity is 372MAH/g (weight ratio capacity) and 855MAH/g (surface area ratio capacity) , It is far from the capacity of 3860MAH/g and 2060MAH/g of lithium metal. Therefore, it is necessary to promote the research and development of high-capacity all-negative materials. In order to increase the electrochemical capacity of the negative electrode material of lithium-ion batteries and prevent the generation of lithium dendrites, people use alloys as negative electrode materials. The alloy material has a big sharp point. During deep charging and discharging, it is accompanied by a very large volume expansion, which leads to the micronization of the material, the reduction of mutual contact, and the fall off from the electrode substrate, which ultimately leads to the decrease of the electrode capacity and the shortened lifespan. . In order to increase and improve the life of the alloy anode material, it is critical to ease the volume expansion during the absorption process. In recent years, people have applied new concepts, new technologies, and new methods, such as master alloys, nanotechnology, thin film technology, composite material concepts, structural design, etc., to study the storage alloy system. Vigor, in recent years, the number of papers published on lithium storage alloy materials has increased dramatically. The tin tomb button storage alloy has received extensive attention due to its high specific capacity, low price and environmental friendliness. However, the large electrode volume changes due to the insertion and extraction of lithium during the charging and discharging process limit the application of the electrode material. After the alloy film electrode is heat-treated, due to the formation of the same alloy cu0s05, the cycle life and coulomb efficiency of the electrode are greatly improved. After 300 cycles of charging and discharging, the electrode capacity remains at 200mahg. The study found that the intermediate transition phase li2cusn is formed during the charge and discharge process, which reduces the volume expansion during the charge and discharge process. At the same time, due to the decomposition of the organic electrolyte on the surface of the thin-film electrode, a 6m thick layer of button carbonate was formed. The bulk swelling of the tin tomb alloy film electrode during charging is largely attributed to the formation of the alloy surface carrier layer. Therefore, it is necessary to find a more suitable organic electrolyte component for the application of metal alloy materials in new lithium-ion batteries. An important subject of All the results indicate that the tin-based alloy electrode material will be a very promising anode material for lithium-ion batteries.

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