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1) The cost of batteries is relatively high. The important performance lies in the high price of the positive electrode material LiCoO2

(Co has limited resources), making it difficult to purify the electrolyte system.

2) Cannot discharge with high current. Due to the organic electrolyte system and other reasons, the internal resistance of the battery is relatively high

Other types of batteries are large. Therefore, a lower discharge current density is required, and the discharge current is generally below 0.5C, which is only suitable for use in small and medium-sized electrical appliances.

3) To protect circuit control.

A. Overcharge protection: Overcharging the battery will damage the positive electrode structure and affect performance and lifespan; Simultaneously overcharging causes the electrolyte to decompose, resulting in high internal pressure and leakage problems; Therefore, it must be charged at a constant voltage of 4.1V-4.2V;

B. Overdischarge protection: Overdischarge can make it difficult to recover the active substance, so it is also necessary to have protective circuit control.

4) The meaning of rechargeable batteries

Rechargeable batteries, also known as batteries or secondary batteries, are batteries that can be recharged and used repeatedly. Common ones include lead-acid batteries (commonly known as batteries when used in automobiles), cadmium nickel batteries, hydrogen nickel batteries, and lithium-ion batteries. 1. The voltage platform of lithium-ion batteries is high: the average voltage of a single battery is 3.7V or 3.2V, which is approximately equal to the series voltage of three nickel cadmium batteries or nickel hydrogen batteries, making it easy to form a battery pack.

Disadvantages of lithium-ion batteries

1. Incorrect use poses safety hazards: Due to the active composition of lithium-ion batteries, improper use can lead to major accidents such as electrolyte decomposition, combustion, and even explosion.

2. Different discharge rates have a significant impact on the available capacity of batteries.

3. Overcharging and over discharging can cause irreparable damage to the battery: In response to these drawbacks, large capacity lithium-ion battery packs generally use protective devices to monitor the battery's usage process.

4. At low temperatures, the performance of the battery deteriorates significantly, with a decrease in discharge platform, reduced output power, and a decrease in available power.

(1) The internal impedance of lithium-ion batteries is high. Because the electrolyte of lithium-ion batteries is an organic solvent, its conductivity is much lower than that of aqueous electrolytes of nickel cadmium batteries and nickel hydrogen batteries. Therefore, the internal impedance of lithium-ion batteries is about 11 times larger than that of nickel cadmium and nickel hydrogen batteries. The impedance of a single cell battery with a diameter of 18mm and a length of 50mm is approximately 90m.

(2) The working voltage changes significantly. When the battery is discharged to 80% of its rated capacity, the voltage change of nickel cadmium batteries is minimal (about 20%), while the voltage change of lithium-ion batteries is significant (about 40%).

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