Working principle and safety analysis of lithium cobalt oxide battery

The charging and discharging process of lithium cobalt oxide battery The charging reaction of lithium cobalt oxide battery: positive: LiCoO2u003dLi1-xCoO2+xli+xe-, negative: 6C+xli+xe-u003dLixC6. Discharge reaction, positive electrode: li1-xcoo2+xLi++xe-u003dLiCoO2, negative electrode: LixC6u003d6C+xLi++xe-. The working principle of lithium cobalt oxide battery The working principle and safety analysis of lithium cobalt oxide battery_Lithium cobalt oxide battery is commonly used according to the reaction formula of the battery, the negative reaction formula is: lixc6-xe-u003dC6+xLi+, the positive reaction The formula is: li1-xcoo2+xLi+xe-u003dLiCoO2. When charging, the positive and negative reaction formulas are opposite, so A is negative and B is positive. Safety performance analysis of lithium cobalt oxide battery The safety function analysis of lithium cobalt acid battery, we will describe in detail by comparing the safety performance of lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium cobalt oxide and lithium lithium manganate battery: The specific energy available for theoretical practice of lithium nickel cobalt manganate (ternary) batteries has been greatly improved. It is related to lithium cobalt oxide batteries, which can better play high-capacity applications, but from the material point of view, ternary batteries The use of lithium nickel cobalt manganese oxide and organic electrolytes cannot fundamentally solve the safety of this problem for the time being. If the short-circuit current of the battery is too large, it will cause potential safety problems. 2. The theoretical capacity of lithium iron phosphate battery is 170mAh/g, and the actual capacity is 160mAh/g. In terms of safety, lithium iron phosphate has high thermal stability, low electrolyte oxidation capacity, and high safety. But its disadvantages are low conductivity, large volume, large electrolyte volume, and poor battery consistency due to large capacity. 3. The biggest feature of lithium cobalt oxide battery preparation is that after fully charged, there is still a large amount of lithium ions in the anode, that is to say, in the negative tolerance, not more lithium ions are in the anode, but in the case of overload, the positive Negative excess lithium ions will still be swimming, because they cannot fully tolerate the formation of cathode metal lithium. Because metal lithium dendrites are called dendrites, dendrites once provide time to penetrate the gap, and the barrier will form an internal short circuit. Because the important component of the electrolyte is carbonate, the flash point and boiling point are low, and it will burn or even explode at higher temperatures. In small-capacity lithium batteries, the composition of lithium dendrites is easy to handle. Therefore, lithium cobalt oxide batteries are currently limited to small-capacity batteries such as portable electronic devices and cannot be used for power lithium-ion batteries. 4. Lithium manganese oxide battery Lithium manganese oxide battery is a small piece of information. It can ensure that under full load conditions, the anode of lithium ions can be completely embedded in the carbon pores of the negative electrode, rather than the anode of lithium cobalt oxide slag to a certain extent On the other hand, it fundamentally prevents the occurrence of dendrites. Theoretically speaking, in practice, lithium manganate batteries may have to take shortcuts if they are subjected to strong external forces during the preparation process, which may result in the process of charging and discharging cycles. Instantly make up the lithium battery and move quickly. When the cathode cannot fully absorb lithium ions, dendrites are formed. The prevention of this result is guaranteed by the battery manufacturer's inspection. In summary, qualified lithium manganate batteries generally do not have safety accidents. The stable structure of lithium manganate makes its oxidation function far lower than that of lithium cobaltate. Even if an external short circuit, it can basically prevent the burning caused by lithium metal separation. And explosion. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: New high-entropy energy storage materials promote the development of lithium batteries