Many friends, the maintenance of lithium -ion batteries will often ask this question, and we will explain it. The positive electrode material of a lithium -ion battery usually has a lithium -activated compound, and the negative electrode is the carbon of the special molecular structure. The main components of common positive materials are LICOO2. When charging, the electromotives added to the battery bipolar forced the positive compounds to release lithium ions, and embedded in the carbon with a chip structure in negative polar molecules. During discharge, lithium ions are precipitated from the carbon of the sheet layer, which is combined with the compound of the positive electrode. The movement of lithium ions generates current.

      Although the principle of chemical reactions is very simple, in actual industrial production, the actual problems that need to be considered are much more: the positive material requires additives The level is designed to accommodate more lithium ions; the electrolytes that fill in the positive and negative electrodes are in addition to maintaining stability, but also require good conductivity and reduce the battery internal resistance. Although lithium ion batteries rarely have the memory effect of nickel -cadmium batteries, the principle of memory effect is crystallization, and this reaction will hardly produce in lithium batteries. However, the capacity of lithium -ion batteries will still decrease after multiple charges, which are complex and diverse.

      It is mainly the change of positive and negative electrode materials itself. From the perspective of the molecular level, the cavity structure that accommodates lithium ions on the positive and negative poles will gradually collapse and block; from a chemical point of view, it is the active passivation of positive and negative poles, and the side reaction will be stable. Other compounds. The positive electrode material will be gradually peeled out in physics. In short, the number of lithium ions that can be freely moved in the battery in the battery can be reduced in the battery.

      We should pay attention that excessive charging and excessive discharge will cause damage to the positive and negative pole of the lithium ion battery. From the molecular level, it can be intuitively understood. Excessive discharge will cause the negative carbon to over -release the lithium ion and make the layer structure structure. If there is a collapse, excessive charging will stuff too much lithium ion into the negative carbon structure, so that some of the lithium ions can no longer be released. This is why lithium -ion batteries are usually equipped with a control circuit for charging and discharging.

       Also, the temperature that is not suitable will trigger other chemical reactions inside the lithium -ion battery to generate compounds we do not want to see, so there are protective temperature control diaphragms or electrolyte between the positive and negative electrodes of lithium ion batteries. additive. Under the condition of the battery, the composite membrane hole is closed or electrolyte degeneration, and the battery internal resistance is increased until the circuit is disconnected.