Posts tagged Millennium

For several years, a nickel-cadmium (NiCd) battery is used in portable devices such as wireless communication devices and laptop computers. brought in 1990, a nickel-metal hydride (NiMH) and lithium-ion (Li-ion) have been on the market and provides greater capacity. The chemical composition of the two batteries were in tough competition, everyone is entitled to offer better performance and smaller footprint.

What to gain chemistry, and which system will pave the way for the new millennium? The winner is the lithium-ion, especially for small portable.

The Li-ion ThinkPad T61 batteryrequires little maintenance, which is in line an advantage that can not other chemicals. There is no memory and no periodic cycling is required to extend the life of the battery. In addition to high energy density and low weight, the degree of self-discharge Li-ion battery is two times lower than that of NiCd and NiMH batteries, lithium-ion product that is well suited to modern applications makes a fuel gauge.

For cons, the lithium-ion fragile and requires a protection circuit to ensure safe operation. The charge current is moderate, and the battery must be carried out according to strict standards. In addition, the Li-ion battery is subject to aging, whether used or not.

The pioneering work on the lithium battery from the year 1912 with GN Lewis but it was not until early 1970 before the first marketing rechargeable batteries Lithium batteries. Attempts to develop rechargeable lithium batteries in the 1980s it was not because of problems in terms of safety.

Lithium is the lightest metal, it offers the greatest electrochemical potential and it generates the largest amount of energy. Battery with lithium metal as negative electrode (anode), where a high voltage and high energy capacity, leading to a very high energy density.

After much research on rechargeable lithium battery ThinkPad T60p Series in the 1980s it was discovered that the cycling of the lithium electrode, which reduces the thermal stability, which changed to a loss of potential heat. If this happens, the temperature of the element is rapidly approaching the melting point of lithium, which to a violent reaction. A large quantity of lithium-ion batteries that were shipped to Japan, have to be in 1991 after a battery used in mobile phones recalled generated hot gases that burns in the face of a man-made.

Because of the inherent instability of lithium metal, especially during charging, research has been redirected to a non-lithium metal in the lithium-ion battery Thinkpad T60. Although its energy density is slightly lower than that of lithium metal, the Li-ion battery is safe if certain precautions are taken during loading and unloading. In 1991 Sony Corporation commercialized the first lithium-ion. Other manufacturers have followed. Today, the battery chemistry Li-ion battery, which knows the fastest growing and most promising.