Types and characteristics of lithium battery cathode materials

Source: 2020 - 03 - 28 nothing hits: time in the process of charging, due to the effect of applying the terminal voltage of battery anode under the drive of the electric field, the electrons that are close to the fluid collected, and is moving to the cathode. Them when they reach the cathode and anode of lithium ion. As lithium ion cathode appearance part of consumption, the concentration of lithium ion, formed between the positive and negative ion concentration is poor. Under the drive of concentration difference, the lithium ions in the positive information from the external and internal movement to the anode and the electrolyte, through the diaphragm, reach the negative external; In addition, under the action of potential drive, electronics and cathode data from an external circuit to meet and part shows cathode data kept electrically neutral. Discharge process is just the opposite. When the closed circuit containing load, while the electrons pass along an external circuit out of negative fluid and arrived at the anode, the discharge process was started. Finally, embedding lithium ion anode in the data, and combined with external circuit electronics. Negative graphite is a kind of layered structure, different types of lithium ion in lithium ion methods of embedding and ejection. Significant difference exists among different lattice structure of the positive data, and moving in and out in the process of charging and discharging lithium ions, process is slightly different. 2. Positive primitive data types and features of the commercialization of the positive data including lithium cobalt oxide, lithium iron phosphate, lithium manganese acid lithium and three yuan. At the same time, although the energy density of cobalt acid lithium has obvious advantages, but the safety problem has become the bottleneck, use planning is becoming more and more small. Manganese acid lithium, poor circulation function, high temperature function is not good, although strong resistance to overcharge, the cost is low, but is currently only on the low-end or low speed vehicles are still in use, the market share is declining. At that time only lithium iron phosphate and ternary lithium is the real mainstream. One has the advantage that the energy density and low temperature function, another has the advantage that the cycle life and safety. So far, the coach mainly use lithium iron phosphate, coach on the range and customer requiring higher cognitive models is to choose the ternary lithium batteries. In addition to the bottleneck of the battery itself, peripheral charging equipment has its own bound. Charging pile, in short, the power output, the greater the shorter charging time. But it is not charging power charging pile of infinite progress. First of all, let's talk about the electric car charging process. When it comes to car battery, the first thought is charging pile. Charging, in short, the greater the power output of pile, the smaller the battery capacity, the shorter the charging time. It has to do and will put full pool of water, drainage pipe, the greater the pool is smaller, the shorter the time nature is one reason. As an electric car users, however, certainly hope your battery capacity is large enough, so the power of natural to increase charging pile is more should be done. Car battery pile is generally divided into ac and dc charging pile charging pile. We have to separate the two. First of all, we will discuss with strong generality communication charging pile. It USES the 220 v alternating current (ac) and household voltage is the same size, general current need 16 or 32 a a, charge is relatively slow, in the case of a battery capacity for about 20 KWH, should be 6 - Eight hours or so to charge.