Cathode and anode in lithium battery

Since ancient times, there has been the saying of Yin-Yang Tai Chi. The ancients emphasized the balance of Yin and Yang in everything. There is also a yin and yang in a lithium-ion battery. Is it necessary to balance the yin and yang? The answer I give here is not definite: In lithium-ion batteries, positive and negative effects need to be achieved. From the CellBalance design, we understand that the CB value of the general lithium cobalt oxide to graphite is about 1.08 or more; here is the need for more graphite anodes. Moreover, according to the research statement, the decay rate of the negative electrode is greater than that of the positive electrode, so the excess of the negative electrode is also to make the cycle longer; according to my research statement 4 years ago (the ternary versus graphite high capacity system): the weekly decay rate of the negative electrode At about 0.25%, the attenuation rate of the positive electrode is only 0.15%; the attenuation of the negative electrode is about twice that of the positive electrode. This number is destined to be in the lithium-ion battery, the positive and negative decline is inevitable! How to achieve positive and negative decline and ensure that the battery is ultimately in balance? The conventional method is nothing more than making a fuss on the conductive agent: less positive electrode conductive agent, more negative electrode conductive agent; or adding some non-conductive materials to the positive electrode, etc.; the cathode control theory comes from this, precisely because The cathode attenuation is too slow, so you need to control it; a typical example of cathode control is lithium cobalt oxide or ternary materials doped with LFP to improve low temperature: the principle is that at low temperature, LFP is close to the insulator, so that the resistance of the positive electrode rises. The increase in chemical conversion slows down the capacity, which ensures that the negative electrode area will not precipitate lithium and guarantees the safety of the entire battery during low-temperature charging. 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 post: Overview of Diaphragm