Development analysis of ternary polymer lithium battery

by:CTECHi     2021-08-21

Ternary polymer lithium battery refers to a lithium battery that uses lithium nickel cobalt manganate (Li (NiCoMn) O2) ternary cathode material as the cathode material. The precursor product of the ternary composite cathode material is nickel salt and cobalt salt. , Manganese salt is the raw material, and the ratio of nickel, cobalt and manganese can be adjusted according to actual needs. Ternary lithium batteries have greater energy density, but their safety is often questioned. The reason for this is that even though these two materials will decompose when they reach a certain temperature, the ternary lithium material will decompose at a lower 200 degrees, while the lithium iron phosphate material is about 800 degrees. And the chemical reaction of the ternary lithium material is more intense, it will release oxygen molecules, the electrolyte will burn rapidly under the action of high temperature, and a chain reaction will occur. To put it simply, ternary lithium materials are more likely to catch fire than lithium iron phosphate materials. However, it should be noted that we are talking about materials, not batteries that have become finished products. Because ternary lithium materials have such potential safety hazards, manufacturers are also working hard to prevent accidents. According to the easy pyrolysis characteristics of ternary lithium materials, manufacturers will do a lot of overcharge protection (OVP), over discharge protection (UVP), over temperature protection (OTP), and over current protection (OCP). effort. Therefore, the spontaneous combustion incident should consider whether the manufacturer's functions in these links are in place, rather than simply giving up food due to choking. So what is the current usage of these two batteries? Let's focus on a set of data. In November last year, the installed capacity of electric buses with lithium iron phosphate batteries accounted for 64.9%, and the installed capacity of ternary lithium batteries was only 27.6%. On the contrary, in the pure electric passenger car market, the installed capacity of ternary lithium batteries in November last year exceeded 76%. It can be seen that the greater energy density of the ternary lithium battery itself should be born as a new energy storage device for automobiles in the future. And now that related safety incidents have occurred, it can be regarded as a good thing when the popularization of new energy vehicles is still in its infancy. In order to achieve the dual goals of seizing the market and obtaining policy support, many new energy vehicle-related companies have relaxed technical requirements and mass-produced energy components that cannot withstand repeated use for a long time. The working environment of automobiles is harsh, and the causes of safety accidents will inevitably increase greatly when these parts are used for a long time. Therefore, we can think that Zhang Xiangmu, director of the Equipment Department of the Ministry of Industry and Information Technology, announced at the China Electric Vehicle Hundreds Conference that the safety performance of ternary lithium battery buses is to be evaluated. This is the intention of the relevant state departments to define a standard from the policy level. To promote the production of industry standards. Whether it is for consumers or manufacturers, it will have a very positive significance in the future. Therefore, there is no need to hesitate just because of the one-sided information about safety accidents of ternary lithium batteries on the Internet. The materials are dangerous. The key lies in how to control them firmly.

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