The difference between lithium ion battery and lithium polymer battery

A lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: during charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; during discharge, the opposite is true. The application prospect of lithium-ion battery is very broad, and it is mainly used in mobile phones and notebook computers. It is the representative of modern high-performance batteries.

Lithium polymer battery, also known as polymer lithium battery, is a chemical battery. Compared with the previous battery, it has the characteristics of high energy, miniaturization and light weight. Lithium polymer batteries have ultra-thin characteristics, and can be made into batteries of different shapes and capacities to meet the needs of some products. The theoretical minimum thickness can reach 0.5mm.

The positive and negative materials used in polymer lithium-ion batteries are the same as liquid lithium ions. The positive materials are divided into lithium cobalt oxide, lithium manganate, ternary materials and lithium iron phosphate materials. The negative electrode is graphite, and the working principle of the battery is also basic. Consistent. The main difference between them is the difference in the electrolyte. Liquid lithium-ion batteries use liquid electrolytes, while polymer lithium-ion batteries use solid polymer electrolytes instead. This polymer can be "dry" or "colloidal" Yes, polymer gel electrolytes are mostly used at present.

Lithium polymer batteries are better. Lithium-polymer battery is an upgraded product of lithium-ion battery. Compared with the popular lithium-ion battery, it has the advantages of large capacity, small size (thin), and safety (no explosion). However, because the replacement of the entire industry chain takes a certain amount of time, its cost (cost) is still relatively high, and it is only used in high-end digital products (ultra-thin notebook computers, etc.).

5. The lithium polymer battery has no memory effect. It is not necessary to empty the remaining power before charging, which is convenient to use.

6. Good safety performance: The polymer lithium battery adopts aluminum-plastic flexible packaging in structure, which is different from the metal shell of the liquid battery. In the event of a safety hazard, the liquid battery is easy to explode, while the polymer battery will only swell at most.

7. Small thickness, can be made thinner: the lithium polymer battery is ultra-thin, and the battery can be assembled into a credit card. Ordinary liquid lithium batteries use the method of customizing the shell first, and then plugging the positive and negative materials. There is a technical bottleneck when the thickness is less than 3mm or 6mm. The polymer battery does not have this problem, and the thickness can be less than 1mm, which meets the needs of current mobile phones. direction.

8. Light weight
Lithium polymer batteries use polymer electrolyte batteries without the need for a metal case as a protective outer packaging. The weight of the polymer battery is 40% lighter than that of the steel case lithium battery with the same capacity specification, and 20% lighter than that of the aluminum case battery.

9. Large capacity
The capacity of polymer lithium battery is 10-15% higher than that of steel shell battery of the same size, and 5-10% higher than that of aluminum shell battery. Using polymer batteries.

10. Small internal resistance
The internal resistance of polymer lithium battery cells is smaller than that of ordinary liquid cells. At present, the internal resistance of domestic polymer cells can even be below 35mΩ, which greatly reduces the self-consumption of the battery and prolongs the standby time of the mobile phone. Can reach the level in line with international standards. This polymer lithium battery that supports large discharge current is an ideal choice for remote control models, and has become the most promising product to replace nickel-metal hydribe batteries.

11. The shape can be customized
Manufacturers are not limited to a standard form factor and can be economically made to the right size. The polymer lithium battery can increase or decrease the thickness of the battery cell according to the needs of customers, and develop new battery cell models. The price is cheap and the mold opening cycle is short. battery capacity.

12. Good discharge characteristics
Polymer lithium batteries use colloidal electrolytes. Compared with liquid electrolytes, colloidal electrolytes have stable discharge characteristics and a higher discharge platform.

13. The design of the protection board is simple
Due to the use of polymer materials, polymer lithium battery cells do not fire or explode, and the cells themselves have sufficient safety. Therefore, the protection circuit design of polymer batteries can consider omitting PTC and fuses, thereby saving battery costs.

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