Analysis of lithium battery charge and discharge characteristics

Source: 2020 - 03 - 28 'hits: lithium battery charging and discharging characteristics of the cells are very LiCoO2, LiNiO2 and LiMn2O2. In the meantime, LiCoO2 originally is a stable layer of the structure of the crystal. However, when x Li ion removal from the LiCoO2, its structure may change, but whether to change depends on the size of the x. Through the study found that when x & gt; 0. B1-5 Xcoo2 unstable structure, crystal will collapse, the collapse of the external expression of cell. Therefore, battery charging voltage by binding should be used to control the b1 - The x value of xcoo2. Charging voltage is generally not greater than 4. 2 v, so x is less than 0. 5. At this point, the b1 - Xcoo2 crystal shape is still stable. - C6 themselves have their own characteristics, and when to positive LiCoO2 lee - for the first time C6, when lee returned to the anode discharge LiCoO2, but become a necessary part of li in the center of the cathode C6, to ensure normal embedded Li Xia to charge and discharge time, otherwise the battery is short, in order to ensure that there is a lee at the anode C6 part of typically ended by bundling discharge threshold voltage: safe maximum charging voltage is 4. 2 2 V and below, discharge threshold voltage. 5 V and above. Recall effect is through the crystal works, the reaction in the lithium battery is rare. But due to various reasons, lithium ion battery in many times after charging still lose capacity. The first is to modify the positive and negative data itself. Look from the molecular level, the positive and negative on lithium ion hole structure will gradually sag and congestion. From the chemical point of view, it is the positive and negative data of passivation, show the side effects and stability of other compounds. Data and physical evidence of the positive electrode is decreasing gradually, and so on. After all, the battery can be free to move in the process of charging and discharging lithium ion of quantity is reduced. Excessive charging and discharging, electrode in lithium ion battery constitute permanent damage, from the molecular level, can be intuitive understanding, anode carbon emissions can cause excessive release of lithium ion and sag of layered structure, excessive charging will take too much lithium ion shoehorned into the structure of cathode carbon, and makes some lithium ion can no longer be released. Improper temperature would cause other chemical reaction, we did not anticipate in lithium ion battery of the compounds, so a lot of lithium ion batteries are maintained between the positive and negative temperature control clearance or electrolyte additives. When the battery temperature to a certain temperature, the composite membrane pore closure or degeneration, electrolyte battery internal resistance increases, until the circuit is disconnected, the battery is no longer to heat up, ensure the battery temperature is normal.