18650 battery 3500mah

　　New batteries after rechargeable Li-ion batteries: 7x energy density

　　Compared with existing lithium-ion rechargeable batteries, the energy density of the module is increased by about 7 times, and the cost is reduced to 1/40. This is the policy proposed by the Ministry of Economy and Industry regarding the functions of electric vehicle batteries. This is the policy value for 2030 proposed by the Ministry of Economy and Industry in a symposium in August 2006 in the report "Proposals for New Generation Auto Batteries". Three years after its release, the report is still considered a roadmap for battery development.

　　7 times the energy density is very necessary. According to EVs launched in 2009, the IMiEV of Mitsubishi sedan has a 160km range, and the Subaru plug-in Stella of Fuji Heavy Industries has a continuous driving range of 80km. In 2009, when electric vehicles were just being introduced, the intra-city scene made sense. But in the future, all gasoline vehicles will be replaced, such a function is obviously lacking in strength. The energy density of such a battery is seven times that of current energy densities, at least not seven times that of lithium-ion rechargeable batteries. Only using the triangular combination of negative electrode LiC6 (intercalated lithium graphite), LiCoO2 (lithium cobalt oxide) or LiMn2O4 (lithium manganese oxide), electrolyte (organic solvent), no matter how improved it is, it cannot get rid of the constraints of the data itself. The above three types of data have theoretical limitations, so it is useless to make a leap forward.

　　To break this barrier, research is underway to develop batteries that go beyond the limits of lithium-ion rechargeable batteries. The aim is to break up the triangular combination in a corner and make the function move forward considerably. Examples include lithium-ion rechargeable batteries using ionic liquids, all-solid-state lithium-ion rechargeable batteries, and lithium-air batteries. Currently, research institutions such as Osaka Prefectural University, Kansai University, Industrial Technology Induction Research Institute, and Electric Power Center Research Institute are developing such batteries. Companies are not yet significant players. However, there are also many car manufacturers interested in cooperating in the organization of these workshops. Meanwhile, Toyota announced that it has started joint discussions with Osaka Prefectural University. In today's lithium-ion rechargeable batteries, the root of the problem is the use of organic solvents in the electrolyte. Organic solvents are prone to fire or leakage. While lithium itself is risky, organic solvents can cause trouble. Otherwise, the presence of the solvent will dilute the electrolyte. However, it is ions that perform the operation, so the remaining solvent will hinder the operation, thereby dragging down the functional index and making it difficult to achieve 7 times the energy density.