Normally, the resistance of ternary batteries is lower than that of lithium cobalt oxide batteries. This is because the ternary battery uses a nickel-cobalt-manganese (NiCoMn) cathode material. Compared with lithium cobalt oxide (LiCoO2) cathode material of lithium cobalt oxide battery, nickel cobalt manganese cathode material has lower internal resistance and better conductivity performance . In addition, the ternary battery also uses improved electrolyte and battery structure designs to further reduce resistance and improve battery performance. Therefore, ternary batteries generally have higher power output and better charging and discharging performance.
The difference between lithium polymer batteries and lithium cobalt oxide lithium batteries
Lithium cobalt oxide is a materialau of current lithium battery cathode and its chemical formula is LiCoO2. Lithium cobalt oxide has high energy density and good electrochemical properties and is widely used in electronic products such as mobile phones and laptops.
The chemical formula of lithium cobalt oxide can be expressed as LiCoO2, where lithium (Li) is a metal element, cobalt (Co) is a metal element transition and oxygen (O) is a metallic element. a non-metallic element. Lithium cobalt oxide is a compound composed of lithium ions and cobaltate ions. Lithium ions are located at the peaks of the crystal lattice of the cathode material, while cobaltate ions are located at the center of the crystal lattice.
The synthesis methods of lithium cobalt oxide include high temperature solid phase method, sol-gel method, co-precipitation methodchemical ation, etc. Among them, the high temperature solid phase method is one of the most commonly used methods. It mixes and heats raw materials such as lithium compounds, cobalt compounds and oxides at high temperatures to finally obtain lithium cobalt oxide crystals.
The electrochemical properties of lithium cobalt oxide are closely related to the charging and discharging performance of the battery. In the battery, lithium ions are released from the positive electrode material and move to the negative electrode material through the electrolyte and separator, thereby realizing the process of charging and discharging the battery. The crystal structure, particle size, morphology and other factors of lithium cobalt oxide will affect its electrochemical performance.
Lithium cobalt oxide is an important cathode material pfor lithium batteries and its chemical formula is LiCoO2. It has high energy density and good electrochemical properties and is widely used in electronic products.
The advantages of lithium cobalt oxide are:
1. High Energy Density: Lithium Cobalt Oxide has a high energy density, meaning that at the same weight. In this case, more electrical energy can be stored, allowing the battery to have a longer service life.
2. Long service life: Lithium cobalt oxide has a long service life, can adapt to different use environments, and has a long service life. This makes it advantageous in situations where prolonged use is required.
3. Good electrochemical properties: Lithium cobalt oxide has good electrochemical properties, which means it can provide higher discharge voltages high and smooth discharge current, which gives the battery better performance.
4. Easy to prepare: Compared with other cathode materials, the preparation process of lithium cobalt oxide is relatively simple and easy to carry out in industrial production.
5. Environmental protection: Lithium cobalt oxide cathode material does not contain harmful elements such as cadmium., environmentally friendly.
6. Increased safety: Compared to early lithium batteries, lithium cobalt oxide is safer because it does not produce dendrites, reducing the risk of internal short circuits in the battery.
7. Suitable for high-rate charging and discharging: Lithium cobalt oxide has good performance, that is, it can be charged and discharged quickly. This makes it advantageous in applications where high power is required, such as electric vehicles.ues and mobile devices.
8. Good low temperature performance: Lithium cobalt oxide can still maintain good electrochemical performance in low temperature environments, so it is suitable for use in cold environments.
9. Good self-discharge performance: Lithium cobalt oxide cathode material has a low self-discharge rate, that is, the battery discharges slowly when not in use, but the discharge rate is slow. This allows lithium cobalt oxide batteries to maintain a long lifespan and not require frequent recharging while in use.
10. Good storage performance: Lithium cobalt oxide cathode material has good storage performance and can maintain its performance unchanged for a long time. This makes lithium cobalt oxide batteries suitable for situationswhere they are not used for long periods of time, such as emergency power supplies.
Structure and principle of the Tesla battery
1. Different characteristics
1. (3 times that of MH-Ni batteries); wide electrochemical stability window, up to 5 V; perfect safety and reliability; longer life, less loss of capacity;
2. Lithium cobalt oxide battery: stable structure, high capacity ratio, outstanding overall performance, but its safety is poor and the cost is very high.
2. Different applications
1. Lithium Polymer Battery: It has been more than 2 years since lithium-ion polymer battery technology matured and was commercialized globally, although sales are increasing rapidly. , However, its market share is still about 10%, which is incomparable with the 90% market share of liquid lithium batteries and is lower than thepeople's expectations.
2. Lithium cobalt oxide battery: The application of lithium cobalt oxide battery is still relatively few. The technology of using cobalt-lithium for small batteries is very mature, but the cost of cobalt-lithium is now too high. Many companies use manganese-lithium instead.
Lithium cobalt oxide has stable performance and is currently the most mature technology used in mobile phones. However, the biggest disadvantage of its application is its high cost. Cobalt is also a relatively rare strategic metal. also has some advantages when used in power batteries.
Detailed information:
1. Pay attention to short circuit conditions
Lithium-ion polymer batteries are prone to short circuits during the charging process. Including: internal short circuit, external short circuit, etc. Although most lithium-ion batteries now have short circuit protection circuits and explosion-proof wires, manyIn some circumstances, this protection circuit may not necessarily work under various circumstances, and the role of explosion-proof wire is also very limited.
2. Do not overcharge when charging
If the lithium-ion polymer battery is charged for too long, the possibility of expansion will increase.
Baidu Encyclopedia - Lithium-ion polymer battery
Baidu Encyclopedia - Lithium-cobalt oxide battery
The Tesla electric vehicle battery uses the 18650 supplied by Panasonic Lithium cobalt oxide batteries, including the NCA series (that is, the nickel-cobalt-aluminum system). The battery ofvehicle is divided into two initial products, 60 kWh or 85 kWh, with each battery having a capacity of 3,100 mAh. Each battery cell is usually expressed in ah. The Model S's 85 kWh battery pack has a total of 8,142 cells. The battery uses 18650 lithium cobalt oxide batteries, which is the key to achieving high cruising range, but its stability will be slightly worse than NCM batteries and lithium iron phosphate batteries in high temperature environments . For this reason, strong technical support must be provided in terms of security. Various insurance measures are used within the battery, including various insurance devices within the battery and between batteries. If a cell detects an internal problem, it is cut off from other cells to avoid affecting the overall battery performance. The batteries are connected in parallel, but the cells andBattery modules are connected in series. The high-voltage battery is installed under the vehicle and is attached to the lower body and subframe using 34 bolts. The battery is a chassis-imposed component that gives the car a flat underside and low center of gravity, providing structural, aerodynamic and handling advantages. Different battery options, including 40 kWh, 60 kWh, and 85 kWh, use the same housing and internal components, but each module has a different battery. The 85 kWh battery consists of 16 modules, each containing 6 cells, and each unit contains 74 individual cells. The 60 kWh battery has 66 cells and the 40 kWh battery has 49 cells. Each module has its own bmb (battery cell board) that monitors the voltage of each battery cell and samples the temperature at four points on the module. The BMB transmits informationns to the BMS (battery management system) via the internal communications bus, which communicates via the powertrain CAN bus. In order to maintain the rated temperature of the battery, a thermal management system is required. The purpose of the high voltage battery is to power the vehicle and accessory systems. It is the primary power source for the vehicle, providing DC power to the inverter to drive the vehicle and to the DC-DC converter to support the 12V electrical system. The DC-DC converter also serves as a high voltage junction box to distribute electrical current to the AC compressor, coolant heater and cabin heater. Communicates with the main charger, charging port, gateway module and off-board charging connector to manage the SOC. The battery also includes contactors B and B, current measuring shunts and 630 A fuses.