What methods can I improve the safety of the battery?

ଲେଖକ: ଆଇଫ୍ଲୋପାୱାର - Leverandør af bærbare kraftværker

1. Use a secure lithium battery electrolyte currently lithium battery electrolyte using carbonate as a solvent, wherein the linear carbonate can improve the charge and discharge capacity of the battery, but their flash point is low, at a lower temperature It will flash, and the fluoro solvent typically has a higher flash point or no flash, so the fluoro solvent is used to suppress the combustion of the electrolyte. Currently studied fluoride solvents include fluoroate and fluoroethyl ether.

Flame retardant electrolyte is a functional electrolyte that the flame retardant function of such electrolytes is usually obtained by adding a flame retardant additive in a conventional electrolyte. Flame-retardant electrolyte is currently solving the most economical and effective measures for lithium battery safety, especially subject to the industry. Using solid electrolytes, instead of organic fluid electrolytes, effectively improve the safety of lithium batteries.

Solid electrolytes include polymer solid electrolytes and inorganic solid electrolytes. The polymer electrolyte, especially the gel-type polymer electrolyte, has been made greatly in the commercial lithium battery, but the gel-type polymer electrolyte is actually a dry-state polymer electrolyte and a liquid electrolyte compromise. As a result, it is very limited in the improvement of battery safety.

Due to the electrolyte of the dry-state polymerization, since it is not like a gel-type polymer electrolyte, it has better safety in terms of leakage, vapor pressure and combustion. At present, the current aggregate electrolyte does not meet the application requirements of polymer lithium battery, and further research is expected to be widely used in polymer lithium storage batteries. Phase related polymer electrolyte, inorganic solid electrolyte has better safety, no volatilization, no combustion, more no leakage problem.

Further, the mechanical strength of the inorganic solid electrolyte is high, the heat-resistant temperature is significantly higher than that of the liquid electrolyte and an organic polymer, enlarged the operating temperature range of the battery; the inorganic material is made into a film, which is more likely to achieve a lithium battery miniaturization, and this type of battery has Ultra-long storage life can greatly broaden the application field of existing lithium batteries. 2. Improve the safety problem of the thermostability of the electrode material is directly caused by the unsafe electrolyte, but from the root cause, it is because the battery itself is not high, the occurrence of thermal out of control caused.

In addition to the thermal stability of the electrolyte, the thermal stability of the electrolyte is also one of the most important reasons, so that the thermal stability of the electrode material is also an important part of improving the safety of the battery, but the electrode mentioned here The thermal stability of material includes not only its own thermal stability, but also includes the thermal stability of the electrolyte material. Usually, the thermal stability of the negative electrode material is determined by the activity of the material structure and the charging negative electrode. Regarding carbon material, spherical carbon material, such as intermediate carbon microspheres (MCMB), with a lower ratio, a higher charge and discharge platform, so its charging state is smaller, and the thermal stability is relatively compared.

Good, high security. The Li4Ti5O12 of the spinel structure is better than the structural stability of the laminated graphite, and the charge and discharge platform is much higher, so the thermal stability is better and the safety is higher. Therefore, MCMB or Li4Ti5o12 is usually used in the power lithium-ion battery of safety requirements to replace ordinary graphite as an negative electrode.

In addition to the material itself, the thermal stability of the negative electrode material is more concerned about the thermal stability of the solid electrolyte membrane (SEI) of the negative electrolyte interface of the electrolyte interface, which is often used by the same material, in particular graphite. Think that it is the first step in the occurrence of heat loss. There are two important ways to improve the thermal stability of the SEI film: one is the surface coating of the negative electrode material, such as coating an amorphous charcoal or metal layer on the surface of the graphite; the other is to add film forming additives in the electrolyte, in the battery During the activation process, they form a SEI film having a stability of the electrode material, which is advantageous for obtaining better thermal stability.