The History of Lithium-Ion Polymer Batteries

Although li-polymer batteries are often referred to simply as lithium batteries or lithium-ion batteries. But in a strict sense, it is not the same. Lithium battery refers to a lithium primary battery. It contains lithium metal in its pure form and is a single-use, non-rechargeable battery.

Here is the content:

• The original origin

• Early Development

• Modernization

The original origin

Lithium-ion polymer batteries evolved from lithium-ion batteries. The main difference is that the electrolyte for the lithium salt in the battery is carried by a solid polymer such as polyethylene glycol or polyacrylonitrile, rather than the organic solvent used in lithium-ion batteries. Li-polymer batteries have the advantage of lower manufacturing cost possibilities, more flexible package shape options, reliability, and durability than lithium-ion batteries. Li-polymer batteries first appeared in consumer electronics around 1995.

Early Development

In the early stages of development, li-polymer batteries had problems with high internal resistance. In December 2007, a company released a new design that can charge faster. Such products are expected to significantly change the existing market structure for consumer electronics, power tools, and electric vehicles when they become available in May 2008. More recent developments have allowed the maximum discharge current to advance from about two times the capacity (in amp hours) to 65 or even 90 times. In turn, the goal of fast charging has been achieved.

Modernization

Today's commercially available Li-polymer batteries are packaged in flexible, soft-film laminates, as opposed to metal hard-case lithium-ion batteries in a pillar form. The hard shell of lithium-ion batteries requires pressure to hold the insulator and electrodes together. Lithium-ion packages do not require such pressure (most do not) because the electrodes and insulator are laminated on top of each other. Due to the lack of a metal hard shell, such a pack can weigh 20% less than a rigid battery itself.

The voltage of a Li-polymer battery varies between 2.7 volts (discharged) and approximately 4.23 volts (fully charged). To prevent overcharging, lithium-ion batteries are limited to less than 4.235 volts per cell when packaged in series.

Li-polymer batteries also have a longer life, and in recent years have begun to claim that the battery can complete 1,000 repeated charge and discharge cycles before declining to 80% capacity. It is better than the 300-500 cycles of li Li-polymer batteries. However, it is emphasized that performing 100% complete discharge loss is the greatest. According to the manufacturer's maintenance instructions, the rate of decay will be further slowed if only 85% is discharged leaving some margin each time. Under these conditions use can reach more than 5,000 times, and another type of lithium battery "thin film lithium battery" has more than 10,000 cycles.

It is the responsibility of each manufacturer to produce li-polymer batteries that meet the standards to ensure the healthy development of the market. We have conducted many tests on our products before they leave our factory, and the quality is guaranteed. If you need a lithium poly battery, you can consider our cost-effective products.