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Performance and development trend of polymer battery
- Jul 09, 2018 -

The polymer battery is generally understood as a polymer battery or a polymer lithium battery. In structure, the full name of the lithium polymer battery should be the lithium ion polymer battery. In this way, it appears that the lithium polymer battery is actually a kind of lithium ion battery. Polymer lithium ion batteries are replaced by solid polymer electrolytes, which can be solid or semi solid (colloidal). What is the performance of polymer batteries? What will the future trend of polymer batteries be?

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Performance advantages of polymer batteries

1. Small size, can be done more thin, ordinary liquid lithium ion battery to use the first custom shell, plug the positive and negative pole village method, thickness to 3.6mm below the existence of technical bottlenecks, polymer core does not exist this problem, the thickness can be less than 1mm, in line with the current demand for mobile phone direction.

2. The capacity is large, the capacity of polymer lithium battery is 10 to 15% higher than that of steel shell with the same size, 5 to 10% higher than that of aluminum shell battery, and it is the first choice for consumers.

3. Light weight, polymer lithium batteries with the same weight and the same specifications of the same steel shell lithium battery light 40%, 20% lighter than aluminum shell batteries.

4. Safety performance is good, once there is a safety hazard, the liquid core is easy to explode, and the polymer core will only be drums. Because the polymer lithium battery structure is made of aluminum plastic flexible packaging, which is different from the metal shell of the liquid core.

5. The internal resistance is small, the internal resistance of the polymer electric core is smaller than that of the general liquid core. The internal resistance of the domestic polymer electric core can even be less than 35m Omega, which greatly reduces the battery's self power consumption and prolongs the standby time of the mobile phone, so it can completely meet the international standards. The polymer lithium battery, which supports large discharge current, is the ideal choice of remote control model, and becomes the most hopeful product to replace Ni MH battery.

6. The shape can be customized, polymer lithium battery can increase or reduce the thickness of the electric core according to the customer's needs, develop new type of electric core, low price, short opening cycle, some even can be tailored according to the shape of the cell phone, so as to make full use of the battery shell space and improve the battery capacity.

7. The discharge characteristic is good, the polymer lithium battery uses the colloid electrolyte, compared with the liquid electrolyte, the colloidal electrolyte has the stable discharge characteristic and the higher discharge platform.

8. The design of the protective plate is simple, the polymer lithium battery has sufficient safety because of the use of polymer materials, the core does not fire and does not explode. Therefore, the protection circuit of the polymer battery can be designed to save the PTC and fuse, thus saving the cost of the battery.

Development trend of polymer battery performance

The future development of polymer battery technology is all solid state batteries. Recently, American scientists have announced the development of all solid state lithium sulfur batteries, which are the solid products of liquid lithium ion batteries, which can increase the energy density. The performance of the polymer battery has not yet reached the level of the solid battery. The energy density target of the solid cell is 400Wh/kg, the 3000 cycle life (10 years), the multiplying performance, capacity and safety greatly improved, so that the polymer battery has both the dual advantages of both large capacity battery and high rate battery.

The first requirement of all solid state batteries is the solid electrolyte. At present, there are many false "polymers" in China, the battery of soft liquid electrolyte, and the soft polymer battery in foreign countries. The electrolyte materials and additives of solid state batteries should be able to improve the electrochemical and thermal stability. The other purpose of the use of additives is to make the heat dissipation and electrical properties of the battery not affected by the solid form.

Polymer batteries have many advantages, such as high energy density, more miniaturization, ultra thin, light weight, high safety and low cost, and have been used more and more in all aspects of social life. The future development direction of polymer battery is solid solid battery, which will greatly improve its service life, rate performance, capacity and safety.