What is the performance of polymer battery What is the development trend of polymer battery performance
Polymer batteries are generally understood as polymer batteries or polymer lithium batteries. From a structural point of view, the full name of lithium polymer batteries should be lithium ion polymer batteries. From this point of view, lithium polymer batteries are actually lithium ion batteries. Kind of. Polymer lithium-ion batteries are replaced by solid polymer electrolytes, which can be solid or semi-solid (colloid). So, what is the performance of polymer batteries? What will happen to the future development trend of polymer batteries?
Polymer battery performance advantages
1. Small size, can be made thinner, ordinary liquid lithium battery pack adopts customized shell first, and then plugged The negative electrode material method has a technical bottleneck when the thickness is less than 3.6mm, while the polymer cell does not have this problem. The thickness can be less than 1mm, which is in line with the current demand for mobile phones.
2. Large capacity; polymer lithium battery has 10-15% higher capacity than steel shell batteries of the same size, and 5-10% higher than aluminum shell batteries. It has become the first choice of consumers and is now on the market. Most fishing gears and electric fishing machines use polymer lithium batteries.
3. Light weight; polymer lithium battery is 40% lighter than steel shell lithium battery with the same capacity and specifications, and 20% lighter than aluminum shell battery.
Four. Good safety performance; once a safety hazard occurs, the liquid battery cell is prone to explode, while the polymer battery cell will only blow up at best. Because the polymer lithium battery uses aluminum-plastic soft packaging in structure, it is different from the metal shell of the liquid battery.
Fifth, the internal resistance is small; the internal resistance of polymer batteries is smaller than that of ordinary liquid batteries. At present, the internal resistance of domestic polymer batteries can even be below 35mΩ, which greatly reduces the battery’s Self-consumption of electricity, extending the standby time of mobile phones, can fully reach the level of international standards. This kind of polymer lithium battery that supports large discharge current is an ideal choice for remote control models, and it has become the most promising product to replace nickel-metal hydride batteries.
Six. The shape can be customized; 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, which are cheap, and the mold opening cycle is short. Some can even be based on mobile phones. The shape is tailor-made to make full use of the battery shell space and increase the battery capacity.
Seven. Good discharge characteristics; polymer lithium batteries use gel electrolyte, which has stable discharge characteristics and a higher discharge platform than liquid electrolytes.
8. The design of the protection board is simple; because the polymer lithium battery adopts polymer materials, the battery core does not catch fire or explode, and the battery itself has sufficient safety, so the protection circuit design of the polymer battery can be Consider omitting PTC and fuses to save battery costs.
Polymer battery performance development trend
The future technological development direction of polymer battery is all-solid-state battery. A few days ago, American scientists announced the development of all-solid-state lithium Sulfur batteries, which are solid-state products of liquid lithium-ion batteries, can increase energy density. The performance of polymer batteries has not yet reached the level of solid batteries. The energy density goal of solid batteries is: 400Wh/kg, 3000 cycles life (10 years), and the rate performance, capacity and safety are greatly improved, so that polymer batteries are both compatible. It has the dual advantages of a large-capacity battery and a high-rate battery.
The first requirement of all solid-state batteries is to solidify the electrolyte. At present, many domestic batteries are fake 'polymersThe electrolyte materials and additives of solid-state batteries should be able to improve electrochemical properties and thermal stability. Another purpose of using additives is to make the heat dissipation and electrical conductivity of the battery not be affected by the solid state.
Polymer batteries have many obvious advantages such as high energy density, smaller size, ultra-thin, lightweight, high safety and low cost, and are increasingly used in all aspects of social life. . The future development direction of polymer batteries is all-solid-state batteries, which will be greatly improved in terms of service life, rate performance, capacity and safety.
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