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Batteries for Laptops
Lithium-ion batteries (sometimes abbreviated Li-ion batteries) are a type of rechargeable battery in which a lithium ion moves between the anode and cathode. The lithium ion moves from the anode to the cathode during discharge and from the cathode to the anode when charging. more...
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Lithium ion batteries are commonly used in consumer electronics. They are currently one of the most popular types of battery for portable electronics, with one of the best energy-to-weight ratios, no memory effect, and a slow loss of charge when not in use. They can be dangerous if mistreated and unless care is taken their lifespan may be reduced. Although originally intended for consumer electronics, lithium-ion batteries are growing in popularity for defense, automotive, and aerospace applications due to their high energy density.
The three primary functional components of a lithium ion battery are the anode, cathode, and electrolyte, for which a variety of materials may be used. Commercially, the most popular material for the anode is graphite, although materials such as TiS2 were originally used. However, the cathode is generally one of three materials: a layered oxide, such as cobalt oxide, a polyanion, such as lithium iron phosphate, or a spinel, such as manganese oxide. Depending on the choice of material for the anode, cathode, and electrolyte, the voltage, capacity, life, and safety of a lithium ion battery can change dramatically. Lithium ion batteries are not to be confused with lithium batteries, the key difference being that lithium batteries have a metallic lithium anode and lithium ion batteries have an anode material into which lithium inserts.
History
Lithium batteries were first proposed by M.S. Whittingham, then at Exxon, in the 1970s. Whittingham used titanium sulfide as the cathode and lithium metal as the anode.
Lithium batteries, in which metallic lithium is the anode, posed severe safety issues. As a result, lithium ion-batteries were developed, in which the anode, like the cathode, is also a material into which lithium ions insert. Lithium-ion batteries came into reality once Bell Labs developed a workable graphite anode to provide an alternative to lithium metal, the lithium battery. Following groundbreaking cathode research by a team led by John Goodenough (then at Oxford University, now at the University of Texas, Austin), the first commercial lithium ion battery was released by Sony in 1991. The cells utilized layered oxide chemistry, specifically lithium cobalt oxide. Used in numerous commercial applications, these batteries revolutionized consumer electronics.
In 1983, Michael Thackeray and coworkers identified manganese spinel as a cathode material. Spinel showed great promise, since it is a low-cost material, has good electronic and lithium ion conductivity, and possess a three dimensional structure, which gives it good structural stability. Although pure manganese spinel shows fade with cycling, this can be overcome with additional chemical modification of the material. Manganese spinel is currently used in commercial cells.
Read more at Wikipedia.org
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