Introduction of lithium cobalt oxide battery

Lithium cobaltate battery has stable structure, high specific capacity and outstanding comprehensive performance, but its safety is poor and the cost is very high. It is mainly used for small and medium-sized batteries. It is widely used in small electronic devices such as notebook computers, mobile phones and MP3/4. The voltage is 3.7V.

Characteristics of lithium cobalt oxide battery

1, excellent electrochemical performance

2, excellent processing performance

3, the tap density is large, which helps to increase the battery volume ratio

4, product performance is stable, good consistency

Advantages and disadvantages of lithium cobalt oxide batteries

Advantage

1, stable structure

2, high capacity ratio

3, excellent process performance

4, volume energy density

Disadvantage

1, poor security

2, the cost is very high

3, the cycle life is general, the material stability is not very good

Lithium cobaltate battery has stable structure, high capacity ratio and outstanding comprehensive performance, but its safety is poor and the cost is very high. It is mainly used for small and medium-sized batteries. It is widely used in small electronic devices such as notebook computers, mobile phones and MP3/4. The voltage is 3.7V.

Lithium cobaltate battery has stable structure, high specific capacity and outstanding comprehensive performance, but its safety is poor and the cost is very high. It is mainly used for small and medium-sized batteries with a nominal voltage of 3.7V.

Characteristics of lithium cobaltate

1. Excellent electrochemical performance a. The average capacity attenuation per cycle is <0.05% b. The first discharge specific capacity is>135MWH/GC 3. 6V initial discharge platform ratio is>85% 2. Processing performance is excellent 3. High tap density Help to improve battery volume ratio capacity 4. Product performance is stable, good consistency Product model R747 tap density 2.4-3.0g/cm3, typical value is 2.5, particle size D506.0-8.5um; R757 tap density 2.4-3.2 g/cm³, typical value is 2.6, particle size D506.5-9.0um; R767 tap density is 2.3-3.0g/cm³, typical value is 2.5, particle size D508-12um;

Use of lithium cobaltate

It is mainly used as a cathode material for the manufacture of lithium ion batteries for mobile phones and notebook computers and other portable electronic devices.

Technical standard for lithium cobalt oxide

1. Name: Lithium cobaltate Molecular formula: LiCoO2 Molecular weight: 97.882, main use: lithium ion battery 3. Appearance requirements: gray black powder, no agglomeration 4, X-ray diffraction: control JCDS standard (16-427), no impurity phase Existence 5, packaging: plastic bag packaging in iron drum 6, chemical composition and physical and chemical properties: nickel Ni 0.05% max (wt%) manganese Mn 0.01% max (wt%) iron Fe 0.02% max (wt%) Calcium Ca 0.03% max (wt%) sodium Na0.01% max (wt%) acidity alkaline pH 9.5-11.5 water content (105oC dry weight loss, %) Moisture (wt% lossat105oC) <0.05 specific surface area (m2 /g) BET surface Area (m²/g) 0.2-0.6 tap density (g/cm3) TapDensity (g/cm³) 1.7-2.9 particle size - D50 (μm) PSD-D50 (μm) 5-12 particle size - D10 (μm) PSD-D10 (μm) 1-5 particle size - D90 (μm) PSD-D90 (μm) 12-25

The application of lithium cobalt oxide battery is still relatively small. The technology of cobalt lithium for small batteries is very mature, but the cost of cobalt lithium is too high. Many companies use manganese lithium instead, and some are manganese lithium. Lithium cobaltate has stable performance. Currently, the technology used in mobile phones is the most mature, but the biggest disadvantage of application is high cost. Cobalt is a scarce strategic metal. In addition, it is also difficult to apply to power batteries. The capacity of the battery is usually related to the following factors:

1 The structure and number of plate. When the other conditions are the same, the capacity of the battery depends on the area of the plates and the porosity of the active material, so the plates are usually made thin. The thickness of the lead storage battery is 1.45-3.0mm.

2 Discharge situation When the degree of discharge of the battery is large, the cross-sectional area of the pores of the plate is reduced due to the large amount of lead sulfate precipitation, and it is difficult to infiltrate the plate into the plate from the surface. Therefore, when the discharge current increases, the sulfuric acid in the pores of the infiltrated plates is insufficient to compensate for the amount of sulfuric acid consumed per unit time, so that the voltage of the battery drops rapidly and the discharge cannot be continued. Therefore, the discharge current increases and the battery capacity decrease.

3 Temperature of electrolyte: When the temperature is lowered, it is difficult to infiltrate the electrolyte into the plate due to the increased viscosity surface. At the same time, when the temperature is lowered, the electrolyte resistance will increase and the voltage will decrease, so the capacity of the battery will decrease.

4 Electrolyte density increasing the electrolyte density can increase the electromotive force of the battery and the ability of the electrolyte to penetrate into the active material in the plate, and reduce the resistance of the electrolyte, thereby increasing the capacity of the reservoir. However, if the electrolyte density is continued to increase, the viscosity will increase. Therefore, when the electrolyte density exceeds a certain value, the electrolyte permeation rate will decrease, and the internal resistance will increase, and the plate vulcanization will increase to increase the battery capacity. Reduced, so only when the electrolyte density is at its best, the battery can get the maximum capacity.

The capacity of the battery voltage of 12v is 2.2AH, 7AH, 14AH, 17AH, 24AH, 32AH, 45AH, 60AH, 80AH, 105AH, 120AH, 160AH, 198AH.

A device that converts chemical energy into electrical energy is called a chemical battery, and is generally referred to as a battery. After discharge, the internal active material can be regenerated by charging - storing electrical energy as chemical energy; and converting the chemical energy into electrical energy when discharging is required. Such a battery is called a battery (Storage Battery), which is also called a secondary battery.

The so-called battery is an electrical chemical device that stores chemical energy and discharges electric energy when necessary.

The five main parameters of the battery are: battery capacity, nominal voltage, internal resistance, discharge termination voltage, and charge termination voltage. The capacity of the battery is usually expressed in Ah (Ah), and 1Ah is the current at 1A.

Discharge for 1 hour. The amount of active material in the unit cell determines the amount of charge contained in the unit cell, and the content of the active substance is determined by the material and volume used by the battery. Therefore, generally, the volume of the battery is larger, the higher the capacity. One parameter related to battery capacity is the charging current of the battery. The charging current of the battery is usually expressed by the charging rate C, which is the rated capacity of the battery. For example, with 2A current charging the 1Ah battery, the charging rate is 2C; similarly, charging the 500mAh battery with 2A current, the charging rate is 4C.

When the battery is shipped from the factory, the potential difference between the positive and negative electrodes is called the nominal voltage of the battery. The nominal voltage is determined by the electrode potential of the plate material and the concentration of the internal electrolyte. When the ambient temperature, When the usage time and work state changes, the output voltage of the unit cell changes slightly. In addition, the output voltage of the battery also has a certain relationship with the remaining capacity of the battery. The nominal voltage of the unit nickel-cadmium battery is about 1.3V (but generally recognized to be 1.25V), the nominal nickel-metal hydride battery has a nominal voltage of 1.25V.

The internal resistance of the battery is determined by the resistance of the plates and the impedance of the ion current. During charge and discharge, the resistance of the plates is constant, but the impedance of the ion current will vary with the change in electrolyte concentration and the increase or decrease of charged ions.

When the battery is fully charged, the active material on the plate has reached saturation state, and then continues to charge, the voltage of the battery will not rise, and the voltage at this time is called the charge termination voltage. Charge termination of nickel-cadmium battery

The voltage is 1.75~1.8V, and the end-of-charge voltage of the NiMH battery is 1.5V. Discharge termination voltage of nickel-cadmium battery at different discharge rates

The discharge termination voltage is the lowest voltage allowed when the battery is discharged. If the battery continues to discharge after the voltage is lower than the discharge termination voltage, the voltage across the battery will drop rapidly, forming a deep discharge, thus,

The product formed on the electrode plate is not easily recovered during normal charging, thereby affecting the life of the battery. The discharge termination voltage is related to the discharge rate. The relationship between the discharge termination voltage and the discharge rate of a nickel-cadmium battery is as follows

The discharge termination voltage of a nickel-hydrogen battery is generally specified as 1V.

The battery parameters are mainly:

1. The capacity of the battery: with Ah (Ah), 1Ah is the current at 1A, usually the battery volume is larger, the higher the capacity.

2. Nominal voltage: When the battery is just shipped from the factory, the potential difference between the positive and negative electrodes is called the nominal voltage of the battery. The nominal voltage is determined by the electrode potential of the plate material and the concentration of the internal electrolyte. When the ambient temperature, the use time, and the operating state change, the output voltage of the unit battery slightly changes. In addition, the output voltage of the battery also has a certain relationship with the remaining power of the battery.

3. Internal resistance: the internal resistance of the battery is determined by the resistance of the plate and the impedance of the ion current. During charge and discharge, the resistance of the plates is constant, but the impedance of the ion current will vary with the change in electrolyte concentration and the increase or decrease of charged ions.

4. Charge termination voltage: When the battery is fully charged, the active material on the plate has reached saturation state, and then continues to charge, the voltage of the battery will not rise, and the voltage at this time is called the charge termination voltage.

5. Discharge termination voltage: The discharge termination voltage refers to the minimum voltage allowed when the battery is discharged. If the battery continues to discharge after the voltage is lower than the discharge termination voltage, the voltage across the battery will drop rapidly, forming a deep discharge, so that the product formed on the electrode plate is not easy to recover during normal charging, thereby affecting the life of the battery; The voltage is related to the discharge rate.

The amount of electricity discharged by the battery under specified conditions (including discharge intensity, discharge current and discharge termination voltage) or the length of discharge time is called battery capacity, and the unit is A·H or A·MIN. A car battery is a reversible DC power source that converts chemical energy into electrical energy and electrical energy into chemical energy. It is connected in parallel with the generator.

It supplies power to the starting system and the ignition system during engine start.

When the engine is stopped or at low idle, it supplies power to the car's electrical equipment.

When there is a demand for electricity exceeding the output of the charging system, the current is supplied by this for a limited period of time.

The battery also absorbs the transient overvoltage in the circuit to keep the voltage of the automotive electrical system stable and protect the electronic components.

The battery will not be used for a long time. It will slowly discharge itself until it is scrapped. Therefore, the car should be started once every certain time to charge the battery. Another method is to pull out the two electrodes on the battery. It is necessary to remove the positive and negative electrode wires from the electrode column. First, unplug the negative wire or remove the connection between the negative electrode and the chassis of the car. Then remove the other end with the positive mark (+). The battery has a certain service life and will be replaced in a certain period of time. The same order should be followed when replacing, but when the electrode wires are connected, the order is reversed, first connected to the positive electrode and then to the negative electrode.

When the ammeter pointer indicates that the storage capacity is insufficient, it should be charged in time. The battery's storage capacity can be reflected on the dashboard. Sometimes the power is not enough on the road, and the engine can't start. As a temporary measure, you can ask other vehicles for help. Use the battery on the vehicle to start the vehicle, connect the negative and negative poles of the two batteries, and connect the positive pole to the positive pole. .

The density of the electrolyte should be adjusted according to the standard according to different regions and seasons.

Battery capacity is now typically calculated using a 10 hour discharge rate. The discharge current is set to I10 (10% of the nominal capacity), the discharge termination voltage is set to 90% U (90% of the nominal voltage), and the discharge starts. If the battery does not reach the termination voltage after 10 hours, the battery capacity is 100. %, if it reaches 5 hours, it will reach the termination voltage, indicating that the capacity is only 50%, and so on!

[Battery Introduction]

A device that converts chemical energy into electrical energy is called a chemical battery, and is generally referred to as a battery. After discharge, the internal active material can be regenerated by charging - storing electrical energy as chemical energy; and converting the chemical energy into electrical energy when discharging is required. Such a battery is called a battery (Storage Battery), which is also called a secondary battery. The so-called battery is an electrical chemical device that stores chemical energy and discharges electric energy when necessary.

The page contains the contents of the machine translation.