Why lithium ion battery capacity will decay?

Source: 2020 - 03 - 28 'hits: why lithium ion battery will decay? Lithium ion batteries is the fastest after nickel cadmium battery and nickel metal hydride batteries secondary battery. Its high energy features make it the future looks very bright. However, lithium ion battery is not perfect. The biggest problem is that the stability of the charging and discharging cycle. This article summary analysis the attenuation, the likely cause of the lithium ion battery capacity including overcharge, electrolyte differentiation and self-discharge. Lithium ion battery in between the two electrodes with different embedding energy. In order to get the best battery performance, the capacity of the two main electrodes than value should be kept in a balance. In lithium ion batteries, the capacity balance shows the positive and negative mass ratio, i. e. , the gamma m = m + / - =Δ xC - /Δ YC + in C type refers to the electrode of the coulomb theory of ability, & Delta; x, yΔ Embedded respectively refers to the number of cathode and anode stoichiometric lithium ion. On the type, the north and south poles for mass ratio depends on the north and south poles respectively corresponding coulomb capacity and the number of reversible lithium ion. In general, small quality than lead to negative electrode using incomplete data; Larger than may be due to the quality of the cathode overcharge, pose a safety hazard. All in all, under the best quality than, battery performance best. To breathe in the lithium ion battery system, its capacity balance within the cycle does not change, and the initial capacity of each loop is a certain value, but the reality is much more complex. Any attack or consume all the side effects of lithium ion or electron could lead to the change of the battery capacity balance, once the battery capacity balance attack changes, this change is irreversible, and through many times cycle accumulation, seriously affect cell function. In lithium ion batteries, except for the REDOX reaction of lithium ion precipitation, there are many side effects, such as the differentiation of the electrolyte, the dissolution of active substances, such as lithium metal accumulation