Lithium Batteries
Lithium Batteries
Lithium Battery Industry Keeps Going
If you open up your mobile phone or laptop or iPad, you'll find a lithium battery. If you own a hybrid or electric car, it's likely powered by a lithium Acer laptop batteries as well. Lithium is a metal that's light and cheap, and it is increasingly the material of choice for battery makers.
Lithium could, in the future, replace a lot of the oil we now use for energy — which raises questions about how much we can realistically rely on the metal. Seth Fletcher, senior editor at Popular Science, explores this in a new book, called Bottled Lightning: Superbatteries, Electric Cars and the New Lithium Economy.
Lithium Logistics
"You have to store metallic lithium in oil, otherwise it tarnishes," Fletcher explains to NPR's Steve Inskeep. "Actually, it's so volatile it doesn't exist in nature in its pure form. So if you're mining for lithium, you never find big arm-sized veins of lithium metal because they just don't exist."
Most of the world's lithium, Fletcher says, comes from a series of salt lakes in a high-altitude region where Bolivia, Chile and Argentina meet. It's called the "lithium triangle."
"Over the years, the water has absorbed minerals and settled in these giant salt sponges, and now there's this rich brine," he says.
When the water evaporates, it leaves behind an olive oil-like substance that has a small percentage of lithium, which is then processed into lithium carbonate, a white powder. And according to Fletcher, there's more than enough to meet the rising demand.
"I don't know of any serious person in the automotive industry or in the lithium industry who believed that there is a serious, long-term supply problem," he says. "In fact, for the next 10 years there will probably be an oversupply of lithium because so many companies have now moved into the market."
And unlike the impact of mining other natural resources, concentrating lithium is an "environmentally benign" process, Fletcher says. "It's about as low-impact as mining can get. They're really just pumping water up ... and there are really no toxic chemicals in a lithium-ion Toshiba laptop battery."
'A Gaping Hole In The Grid'
Using lithium Dell batteries can also boost the efficiency of how we store energy — say, from a wind farm or a bank of solar cells, Fletcher says.
"What a lot of companies are working on right now is building gigantic banks of lithium-ion batteries that can store energy from power plants," he says. "Right now we don't store energy effectively at all. That's a big gaping hole in the grid right now."
A limiting factor to the batteries, however, is the amount they can store and how quickly they can be recharged. While companies work to produce better lithium batteries, Fletcher argues, people should take advantage of the current uses.
"Batteries are going to get better, but we don't have a battery that can power a car for 500 miles and then recharge in 15 minutes," he says. "It's going to be a long time before we have that battery, but the batteries we do have right now can do a lot of incredibly useful things, and they can do them very efficiently and affordably. I think we would be wise to use them to do those things while we're simultaneously developing future chemistries that maybe could power a car 500 miles and recharge in 15 minutes."
About the Author
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Where and how to recycle lithium batteries?
I have a bunch of cell phone batteries that are lithium and I have not found a good resource of where and how to recycle them.
Most places that sell replacement batteries have a box where you can deposit your old ones for recycling. That includes cell phone stores, Radio Shack, and Best Buy. Home Depot, Lowes, Target and Walmart will also take them.
The link below will help you find locations near you where you can recycle your batteries free.
Don
Lithium Batteries
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What's the best Lithium battery ?
What's the best Lithium battery ?
We often get puzzled by announcements of new batteriesthat are said to offer very high energy densities, deliver 1000 charge/discharge cycle and are paper-thin. Are they real? Perhaps — but not in one and the same battery. While one battery type may be designed for small size and long runtime, this pack will not last and wear out prematurely. Another battery may be built for Long Life, but the size is big and bulky. A third battery may provide all the desirable attributes, but the price would be too high for commercial use.
Battery manufacturers are well aware of customer needs and have responded by offering packs that best suit the specific applications. The mobile phone industry is an example of clever adaptation. Emphasis is placed on small size, high energy density and low price. Longevity comes in second.
Compromises also exist on lithium-based batteries. Li‑ion packs are being produced for defense applications that far exceed the energy density of the commercial equivalent. Unfortunately, these super-high capacity Li‑ion batteries are deemed unsafe in the hands of the public and the high price puts them out of reach of the commercial market.
In this article we look at the advantages and limitations of the commercial battery. The so-called miracle battery that merely live in controlled environments is excluded. We scrutinize the batteries not only in terms of energy density but also longevity, load characteristics, maintenance requirements, self-discharge and operational costs. Since NiCd remains a standard against which other batteries are compared, we evaluate alternative chemistries against this classic battery type.
Lithium Ion (Li‑ion) — fastest growing battery system. Li‑ion is used where high-energy density and lightweight is of prime importance. The technology is fragile and a protection circuit is required to assure safety. Applications include notebook computers and cellular phones.
Lithium Ion Polymer (Li‑ion polymer) — offers the attributes of the Li-ion in ultra-slim geometry and simplified packaging. Main applications are mobile phones.
The Lithium Ion battery
Pioneer work with the lithium battery began in 1912 under G.N. Lewis but it was not until the early 1970s that the first non-rechargeable lithium batteries became commercially available. Lithium is the lightest of all metals, has the greatest electrochemical potential and provides the largest energy density per weight.
Attempts to develop rechargeable lithium batteries followed in the 1980s, but failed due to safety problems. Because of the inherent instability of lithium metal, especially during charging, research shifted to a non-metallic lithium battery using lithium ions. Although slightly lower in energy density than lithium metal, the Li‑ion is safe, provided certain precautions are met when charging and discharging. In 1991, the Sony Corporation commercialized the first Li‑ion battery. Other manufacturers followed suit. Today, the Li‑ion is the fastest growing and most promising battery chemistry.
The energy density of the Li‑ion is typically twice that of the standard NiCd. Improvements in electrode active materials have the potential of increasing the energy density close to three times that of the NiCd. In addition to high capacity, the load characteristics are reasonably good and behave similarly to the NiCd in terms of discharge characteristics (similar shape of discharge profile, but different voltage). The flat discharge curve offers effective utilization of the stored power in a desirable voltage spectrum.
The high cell voltage allows battery packs with only one cell. Most of today's mobile phones run on a single cell, an advantage that simplifies battery design. To maintain the same power, higher currents are drawn. Low cell resistance is important to allow unrestricted current flow during load pulses.
The Li‑ion is a low maintenance battery, an advantage that most other chemistries cannot claim. There is no memory and no scheduled cycling is required to prolong the battery's life. In addition, the self-discharge is less than half compared to NiCd, making the Li‑ion well suited for modern fuel gauge applications. Li‑ion cells cause little harm when disposed.
Despite its overall advantages, Li‑ion also has its drawbacks. It is fragile and requires a protection circuit to maintain safe operation. Built into each pack, the protection circuit limits the peak voltage of each cell during charge and prevents the cell voltage from dropping too low on discharge. In addition, the cell temperature is monitored to prevent temperature extremes. The maximum charge and discharge current is limited to between 1C and 2C. With these precautions in place, the possibility of metallic lithium plating occurring due to overcharge is virtually eliminated.
Aging is a concern with most Li‑ion batteries and many manufacturers remain silent about this issue. Some capacity deterioration is noticeable after one year, whether the battery is in use or not. Over two or perhaps three years, the battery frequently fails. It should be noted that other chemistries also have age-related degenerative effects. This is especially true for the NiMH if exposed to high ambient temperatures.
Storing the battery in a cool place slows down the aging process of the Li‑ion (and other chemistries). Manufacturers recommend storage temperatures of 15°C (59°F). In addition, the battery should be partially charged during storage.
Manufacturers are constantly improving the chemistry of the Li‑ion battery. New and enhanced chemical combinations are introduced every six months or so. With such rapid progress, it is difficult to assess how well the revised battery will age.
The most economical Li-ion battery in terms of cost-to-energy ratio is the cylindrical 18650 cell. This cell is used for mobile computing and other applications that do not demand ultra-thin geometry. If a slimmer pack is required (thinner than 18 mm), the prismatic Li‑ion cell is the best choice. There are no gains in energy density over the 18650, however, the cost of obtaining the same energy may double.
For ultra-slim geometry (less than 4 mm), the only choice is Li‑ion polymer. This is the most expensive system in terms of cost-to-energy ratio. There are no gains in energy density and the durability is inferior to the rugged 18560 cell.
Advantages and Limitations of Li-ion Batteries
Advantages
High energy density — potential for yet higher capacities.
Relatively low self-discharge — self-discharge is less than half that of NiCd and NiMH.
Low Maintenance — no periodic discharge is needed; no memory.
Limitations
Requires protection circuit — protection circuit limits voltage and current. Battery is safe if not provoked.
Subject to aging, even if not in use — storing the battery in a cool place and at 40 percent state-of-charge reduces the aging effect.
Moderate discharge current.
Subject to transportation regulations — shipment of larger quantities of Li-ion batteries may be subject to regulatory control. This restriction does not apply to personal carry-on batteries.
Expensive to manufacture — about 40 percent higher in cost than NiCd. Better manufacturing techniques and replacement of rare metals with lower cost alternatives will likely reduce the price.
Not fully mature — changes in metal and chemical combinations affect battery test results, especially with some quick test methods.
Advantages and limitations of Li-ion batteries
The Lithium Polymer battery
The Li-polymer differentiates itself from other battery systems in the type of electrolyte used. The original design, dating back to the 1970s, uses a dry solid polymer electrolyte. This electrolyte resembles a plastic-like film that does not conduct electricity but allows an exchange of ions (electrically charged atoms or groups of atoms). The polymer electrolyte replaces the traditional porous separator, which is soaked with electrolyte.
The dry polymer design offers simplifications with respect to fabrication, ruggedness, safety and thin-profile geometry. There is no danger of flammability because no liquid or gelled electrolyte is used. With a cell thickness measuring as little as one millimeter (0.039 inches), equipment designers are left to their own imagination in terms of form, shape and size.
Unfortunately, the dry Li-polymer suffers from poor conductivity. Internal resistance is too high and cannot deliver the current bursts needed for modern communication devices and spinning up the hard drives of mobile computing equipment. Heating the cell to 60°C (140°F) and higher increases the conductivity but this requirement is unsuitable for portable applications.
To make a small Li-polymer battery conductive, some gelled electrolyte has been added. Most of the commercial Li-polymer batteries used today for mobile phones are a hybrid and contain gelled electrolyte. The correct term for this system is Lithium Ion Polymer. For promotional reasons, most battery manufacturers mark the battery simply as Li-polymer. Since the hybrid lithium polymer is the only functioning polymer battery for portable use today, we will focus on this chemistry.
With gelled electrolyte added, what then is the difference between classic Li‑ion and Li‑ion polymer? Although the characteristics and performance of the two systems are very similar, the Li‑ion polymer is unique in that solid electrolyte replaces the porous separator. The gelled electrolyte is simply added to enhance ion conductivity.
Technical difficulties and delays in volume manufacturing have deferred the introduction of the Li‑ion polymer battery. In addition, the promised superiority of the Li‑ion polymer has not yet been realized. No improvements in capacity gains are achieved — in fact, the capacity is slightly less than that of the standard Li‑ion battery. For the present, there is no cost advantage. The major reason for switching to the Li-ion polymer is form factor. It allows wafer-thin geometries, a style that is demanded by the highly competitive mobile phone industry.
Advantages and Limitations of Li-ion Polymer Batteries
Advantages
Very low profile — batteries that resemble the profile of a credit card are feasible.
Flexible form factor — manufacturers are not bound by standard cell formats. With high volume, any reasonable size can be produced economically.
Light weight – gelled rather than liquid electrolytes enable simplified packaging, in some cases eliminating the metal shell.
Improved safety — more resistant to overcharge; less chance for electrolyte leakage.
Limitations
Lower energy density and decreased cycle count compared to Li-ion — potential for improvements exist.
Expensive to manufacture — once mass-produced, the Li-ion polymer has the potential for lower cost. Reduced control circuit offsets higher manufacturing costs.
About the Author
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Lithium Batteries