HIGH RATE BATTERY
High Rate Discharge Battery
High rate series battery generally refers to the lion lithium battery, which mainly relies on lithium ions' moving between the positive and negative electrodes to achieve work. During the charging and discharging process, Li+ is intercalated and deintercalated back and forth between the two electrodes. When recharging the battery, Li+ is deintercalated from the positive electrode and inserted into the negative electrode through the electrolyte. The negative electrode is in a lithium-rich state, and during discharge, the condition is opposite.
The high-rate discharge battery has a wide operating temperature ranging from -20℃ to 60℃. It has superior cycle performance, with fast charging and discharging function, and its charging efficiency is up to 100%. Besides, it has high output power and long service life. The factors affecting the high rate battery discharge are as follows (take lithium-ion high-rate batteries as an example):
Factors affecting the high-rate discharge battery performance of the negative electrode
Many factors affect the high-rate discharge battery performance of the negative electrode, such as the structure, size, electrode thickness, surface resistance, etc., but these factors affecting the negative electrode can be summarized as the following two aspects:
From the influence on the high rate performance caused by material structure, size, and electrode thickness, we can see the length of the diffusion path of lithium ions in the material or electrode, that is, the difference in the concentration of lithium ions in the electrode will do effect on the high rate performance of the electrode, namely, the internal resistance of concentration polarization is an aspect that affects the high rate performance of the negative electrode;
From the influence of electrode surface resistance and electrode conductivity on the high-rate performance of the negative electrode, it can be concluded that the ohmic internal resistance is another aspect that affects the high-rate performance of the negative electrode. It can be seen that the size of these two internal resistances can affect the high-rate performance of the negative electrode because the size of the internal resistance (the sum of the polarization internal resistance and the ohmic internal resistance) directly affects the degree of polarization of the negative electrode during high-rate discharge.
Factors affecting the high-rate discharge battery performance of the positive electrode
1) Structure of cathode material
It is generally believed that the diffusion coefficient of lithium ions is relatively small, which is a controlling factor for high-rate discharge, while LiMn2O2 is a cubic crystal structure with three-dimensional channels, which is conducive to the rapid migration of lithium ions in it. And It is considered as an electrode material suitable for high-rate charge and discharge.
2) Electrode conductivity
Since LiCoO2, LiMn2O4 and LiFePO4 have low electrical conductivity, it is usually necessary to add conductive agents (carbon black, acetylene black) to improve its electrical conductivity when preparing working electrodes. During high-rate discharge, the conductive agent has a particularly prominent effect on the performance of the cathode material.
3) The particle size of the cathode material and electrode film thickness
Both the discharge capacity and the cycle performance of high current have a certain relationship with the thickness of the electrode film. The thicker the electrode film is, the smaller the specific capacity is at high current. The thinner the electrode film is, the better the cycle performance under high current. The cause is similar to the negative electrode.
Types of high rate batteries
Lithium ion battery high discharge rate
Lithium ion battery high discharge rate is an energy conversion and storage device that converts chemical energy into electrical energy through reaction. The surface structure is divided into a positive electrode, a negative electrode, and battery shell. The internal structure is divided into a winding structure and a laminated structure. As electrical appliances require higher performance of lithium ion battery high discharge rate, the production workshops of major manufacturers must strictly control moisture and impurities. Moisture directly affects battery capacity and high-temperature performance, and impurities directly affect battery self-discharge.
Advantages of lithium ion high rate battery
Diversified appearance: it can be designed into square, cylindrical, triangular, and moon shape;
Thin thickness: the thinnest thickness can be 0.5mm;
It can be made into a single high-voltage battery and the batteries can be connected in series;
High capacity: the capacity of the same type battery is 15% higher than that of the aluminum shell;
Lightweight: the same type of battery is 30% lighter than the aluminum shell;
High current discharge: aluminum shell can discharge at a maximum of 3C, and flexible packaging can discharge at a maximum of 35C-40C, or even higher;
Good safety performance: the flexible packaging battery will not explode, cause a serious fire or slightly bulge;
Environmental protection: there is no obvious liquid electrolyte inside the flexible battery.
High rate polymer battery
The full name of high rate polymer battery is polymer lithium-ion power lithium battery, which belongs to a kind of lithium-ion battery. The combination of a high rate and the polymer lithium-ion battery is the high rate polymer battery with a large discharge C value. They are generally not used in digital products such as mobile phones, but it is used in the power system of electric cars, various airplanes, and remote control model cars that need explosive power.
High rate polymer battery requires a large discharge C value, but not every lithium-ion battery produced by each factory has a high rate. There are various types of lithium-ion batteries, and the batteries of lithium-ion battery manufacturers are also very different. Their strategy and technology emphasis differ.
KIJO battery has a lot of high rate batteries, and the battery life is relatively long. Its battery enjoys a high reputation in the aircraft model industry with advanced cell technology and great battery durability. Welcome to buy!
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