18650 battery lithium ion 2200mah

　　Will 18650 battery lithium ion 2200mah be the leader in new generation battery technology?

　　Introduction: Whether subjectively or objectively speaking, the development of 18650 battery lithium ion 2200mah is an inevitable choice. Of course, the time may be longer and the road may be more tortuous.

　　(Source: WeChat public account "Battery Alliance" ID: zgcbcu Author: Suke)

　　The development of battery technology today can be said to be relatively mature, but it has also encountered bottlenecks and is in urgent need of the birth of a new generation of technology, especially in the field of new energy.

　　18650 battery lithium ion 2200mah are expected to become the most popular next-generation power battery technology. Because all-18650 battery lithium ion 2200mah not only have relatively high technological maturity, many domestic and foreign lithium-ion battery companies have also regarded all-solid-state battery technology as an important next-generation technology reserve.

　　In addition, 18650 battery lithium ion 2200mah are a technology strongly supported by a group of top international scholars such as John Bunningster Goodenough, who recently won the Nobel Prize in Chemistry.

　　Therefore, whether it is subjective or objective, developing 18650 battery lithium ion 2200mah is an inevitable choice. Of course, the time may be longer and the road may be more tortuous.

　　18650 battery lithium ion 2200mah have the advantages of high safety, high energy density, long cycle life, and wide operating temperature range, among which the core is the solid electrolyte.

　　From a technical perspective, solid electrolytes can be divided into three main categories, namely oxide electrolytes, such as the common LLZO electrolyte; sulfide electrolytes, such as Li2S–P2S5 electrolyte; organic polymer electrolytes, such as the common PEO-based polymer Electrolytes, etc.

　　In the early stages of the development of solid-state battery technology, due to the relatively low conductivity of solid electrolyte materials, research and development focused mostly on improving the conductivity of solid electrolytes. Therefore, sulfide electrolytes and oxide solid electrolytes with high ionic conductivity attracted widespread attention. .

　　However, with the continuous advancement of technology, researchers have found that conductivity is no longer the main factor restricting the development of 18650 battery lithium ion 2200mah. Interface issues and mass production processes are the current difficulties that need to be overcome.

　　Sulfide and oxide electrolytes have poor mechanical processing performance, and interface contact problems and mass production process problems have not yet been solved. Polymer electrolytes have become the most promising of the three technical routes due to their excellent processing characteristics and good interface contact. A kind of hope.

　　Polymer-based solid-state lithium-ion batteries have made great progress in academic research, but their industrialization process is still relatively slow, and there is currently no clear commercialization timetable.

　　Generally speaking, polymer electrolytes have excellent processing performance and can form good interface contact with electrode materials. However, the electrolyte has low conductivity at room temperature, so it is difficult for lithium-ion batteries using polymer electrolytes to operate at temperatures below 60°C.

　　The conductivity of sulfide solid electrolyte at room temperature is very high, close to that of liquid electrolyte, and has good processing performance. However, it is unstable in the atmospheric environment and easily produces highly toxic H2S gas with the moisture in it. Therefore, the entire processing process needs to be protected by an inert atmosphere. carried out, the production cost is higher.

　　The oxide electrolyte has high conductivity and good stability in air, but the interface problem with the electrode material needs to be optimized, and the oxide electrolyte is more brittle and has poor processing performance.

　　Therefore, although 18650 battery lithium ion 2200mah currently have advantages that lithium-ion batteries cannot match, the development of all-18650 battery lithium ion 2200mah is still a road full of thorns. Currently, there are major problems such as high cost, poor interface contact, and lithium dendrite growth.

　　In terms of cost, taking the common LLZO electrolyte as an example, the current price of LLZO electrolyte is 2,000$/kg, which is much higher than traditional carbonate electrolytes.

　　In terms of interface contact, in all-18650 battery lithium ion 2200mah, transition metal oxide particles are still the main cathode material. When made into electrodes, a large number of complex pores will be formed within the electrode. Traditional liquid electrolytes can penetrate into these pores, thus ensuring that all All active materials can participate in electrochemical reactions.

　　However, the solid electrolyte is not fluid, so it is difficult to ensure full contact between the active material particles and the solid electrolyte. At the same time, the volume change of the active material during the battery charge and discharge process will further destroy the contact interface between the solid electrolyte and the active material particles, causing solid electrolyte The large contact resistance with the active material affects the performance of solid-state lithium-ion batteries.

　　In addition, 18650 battery lithium ion 2200mah still have the problem of lithium dendrites. Generally, we think that the good mechanical strength of solid-state electrolytes can effectively inhibit the growth of Li dendrites. However, research shows that Li dendrites can still form along two types of solid-state electrolytes: Li7La3Zr2O12 and Li2S–P2S5. The grain boundaries grow rapidly, and internal short circuits often occur after dozens of cycles, seriously affecting the service life of all-solid-state lithium-ion batteries.

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