Polymer lithium batteries are better. Lithium polymer battery is an upgraded product of lithium ion battery. Compared with the current popular lithium ion battery, it has the advantages of large capacity, small size and safety. But the price is also more expensive.
Polymer lithium battery advantages
1. The working voltage of the single-cell ternary lithium-ion battery is as high as 3.6v~3.8v, which is much higher than the 1.2V voltage of nickel-metal hydride and nickel-cadmium batteries.
2. The capacity density is large, and the capacity density is 1.5~2.5 times or higher for the nickel-hydrogen battery or the nickel-cadmium battery.
3, self-discharge is small, the capacity loss of the ternary lithium-ion battery after a long time of placement is also small.
4, long life, normal use of its cycle life can reach more than 500 times.
5, no memory effect, do not have to empty the remaining power before charging, easy to use.
6, good safety performance
The lithium iron phosphate lithium ion battery adopts aluminum plastic flexible packaging in structure, and the lithium iron phosphate lithium ion battery is different from the metal outer casing of the liquid battery. Once the safety hazard occurs, the liquid battery core is easy to explode, and the polymer battery core is only gas. drum.
7, the thickness is small, can be made thinner
Ultra-thin, the battery can be assembled into a credit card. Ordinary liquid lithium battery adopts the method of customizing the outer casing and plugging the positive and negative materials. The thickness of the material is 3.6mm or less. There is a technical bottleneck. The polymer battery core does not have this problem. The thickness can be less than 1mm, which is in line with the current demand of mobile phones. .
8, light weight
A battery using a polymer electrolyte does not require a metal shell as a protective outer package. The weight of the polymer battery is 40% lighter than the steel shell lithium battery of the same capacity specification, which is 20% lighter than the aluminum shell battery.
9, large capacity
Lithium Manganate Lithium Ion Battery has a capacity of 10-15% higher than that of the same size steel shell battery, which is 5-10% higher than that of aluminum shell battery. It is the first choice for color screen mobile phones and MMS mobile phones. Now lithium manganese oxide lithium ion battery is new in the market. Most of the color screen and MMS mobile phones use polymer batteries.
10. Small internal resistance
The internal resistance of the polymer battery core is smaller than that of the general liquid battery. At present, the internal resistance of the domestic polymer battery core can even be less than 35mΩ, which greatly reduces the self-consumption of the battery and prolongs the standby time of the mobile phone. The level of integration with the international. This polymer lithium battery that supports large discharge currents is an ideal choice for remote control models and is the most promising alternative to nickel-metal hydride batteries.
11, the shape can be customized
Manufacturers are not limited to standard shapes and can be economically made to the right size. Polymer batteries can increase or decrease the thickness of batteries according to customers' needs. Develop new battery models, which are cheap, open cycle is short, and some can even be customized according to the shape of mobile phones to make full use of battery casing space and upgrade batteries. capacity.
12, good discharge characteristics
The polymer battery uses a colloidal electrolyte, which has a smooth discharge characteristic and a higher discharge platform than a liquid electrolyte.
13, the protection board is simple in design
Due to the use of polymer materials, the battery core does not ignite or explode, and the battery core itself has sufficient safety. Therefore, the protection circuit design of the polymer battery can be omitted by omitting the PTC and the fuse, thereby saving battery cost.
1. Lithium primary batteries have poor safety and there is a danger of explosion.
2. The lithium ion battery of lithium cobalt oxide cannot discharge at a large current, and the safety is poor.
3. Lithium-ion batteries need to protect the line to prevent the battery from being overcharged and discharged.
4. The production requirements are high and the cost is high.
Compared with lithium-ion batteries, lithium polymer batteries have better safety, operating temperature range, cycle life and environmental performance, so lithium polymer batteries are better.
There are two kinds of raw materials currently used to manufacture lithium ion batteries, one is lithium cobaltate and the other is lithium manganate.
Lithium battery made of lithium manganate material, lithium manganate is more active in chemical properties, has a shorter life span of regenerative charging, and easily bulges, so the application function is lower, and consumer electronic products are generally not made of lithium manganate material. Lithium-ion battery. The lithium ion battery cathode material currently sold in the market is generally lithium cobalt oxide, so the lithium ion battery is also called lithium cobalt oxide battery.
The battery structure made of lithium cobalt oxide material is not chaotic, the specific capacity is higher than that of lithium manganate, and the cost is higher than that of lithium manganate, but the safety is higher than that of lithium manganate, so the vast majority Lithium cobaltate is used as a battery material for consumer electronics.
1, high security: can not deny, relatively speaking, polymer batteries are safer than 18650 batteries, or dangerous damage is not so large, in general, polymer batteries are at most Drums, ruptures, and burning, without the direct destructive nature of the explosion.
2, the capacity is larger: compared to the general battery, the capacity of the polymer is relatively large, the gram capacity is up to 100/115 mAh / g.
3, the shape is flexible: because the polymer is packaged in aluminum film, there is no fixed shape, so it can be made into flat cells, or according to the needs of different customers, custom-made batteries with different shapes to meet different needs Very flexible.
4, fast charging speed: Compared with other battery types, the charging speed of the polymer battery is much faster, and the discharge current is relatively stable.
5 weight is relatively light: due to the use of hard shell protection, the polymer battery is lighter than the same volume of 18650 batteries.
1, high cost: compared with other batteries, the cost of polymer batteries is almost the highest, and is concentrated on the electrolyte is difficult to reduce, high cost has become a major factor restricting the development of polymer batteries.
2, there is no fixed model: due to the variability of the shape, although it can better meet the needs of the market, but it also results in no uniform model, there is no possibility of replacement, thus losing the market continuity.
3, the cottage is serious: due to the polymer battery market prospects, but the manufacturing cost is high, so there are a lot of 18650 batteries in the market flat after the cottage into a polymer battery, once a cottage crisis.
4. Low energy density: Compared with other lithium-ion batteries, the energy density of polymers is relatively low, which has led many manufacturers to desperately compress safety protection in order to increase capacity.