MemberID: PassWord:     
   China NO.1 Battery Supplier!           After Sales Service Hotline +86-400 8855 561 ext. 619   
3K rechargeable battery 3.2v 50ah lifepo4 battery cell 50ah 55380 has sent to USA              1k GEB lifepo4 battery 50ah 3.2v lifepo4 cylindrical battery cell 50ah 55380 has sent to German              Gummy material addresses safety concerns of lithium ion batteries              6K GEB805060 3.7V 2600mAh lithium polymer rechargeable battery sent to Italy              
 KeyWord:   
 
News Center
 
Profession news
Company news
 
Search
 
Key:
Scope:
 

 

 
HomeNews Center Company news
 
How a lithium-ion battery works
News source:gebattery    Reads:1984    AddTime:2014-11-25 10:20:37    Collects this page

How a lithium-ion battery works

The inner workings of a type of electrode widely used in lithium-ion batteries has been revealed through new observations by researchers. The new findings explain the unexpectedly high power and long cycle life of such batteries, the researchers say.

Diagram illustrates the process of charging or discharging the lithium iron phosphate (LFP) electrode. As lithium ions are removed during the charging process, it forms a lithium-depleted iron phosphate (FP) zone, but in between there is a solid solution zone (SSZ, shown in dark blue-green) containing some randomly distributed lithium atoms, unlike the orderly array of lithium atoms in the original crystalline material (light blue). This work provides the first direct observations of this SSZ phenomenon.

 

New observations by researchers at MIT have revealed the inner workings of a type of electrode widely used in lithium-ion batteries. The new findings explain the unexpectedly high power and long cycle life of such batteries, the researchers say.

The findings appear in a paper in the journal Nano Letters co-authored by MIT postdoc Jun Jie Niu, research scientist Akihiro Kushima, professors Yet-Ming Chiang and Ju Li, and three others.

The electrode material studied, lithium iron phosphate (LiFePO4), is considered an especially promising material for lithium-based rechargeable batteries; it has already been demonstrated in applications ranging from power tools to electric vehicles to large-scale grid storage. The MIT researchers found that inside this electrode, during charging, a solid-solution zone (SSZ) forms at the boundary between lithium-rich and lithium-depleted areas -- the region where charging activity is concentrated, as lithium ions are pulled out of the electrode.

Li says that this SSZ "has been theoretically predicted to exist, but we see it directly for the first time," in transmission electron microscope (TEM) videos taken during charging.

The observations help to resolve a longstanding puzzle about LiFePO4: In bulk crystal form, both lithium iron phosphate and iron phosphate (FePO4, which is left behind as lithium ions migrate out of the material during charging) have very poor ionic and electrical conductivities. Yet when treated -- with doping and carbon coating -- and used as nanoparticles in a battery, the material exhibits an impressively high charging rate. "It was quite surprising when this [rapid charging and discharging rate] was first demonstrated," Li says.

"We directly observed a metastable random solid solution that may resolve this fundamental problem that has intrigued [materials scientists] for many years," says Li, the Battelle Energy Alliance Professor of Nuclear Science and Engineering and a professor of materials science and engineering.

The SSZ is a "metastable" state, persisting for at least several minutes at room temperature. Replacing a sharp interface between LiFePO4 and FePO4 that has been shown to contain many additional line defects called "dislocations," the SSZ serves as a buffer, reducing the number of dislocations that would otherwise move with the electrochemical reaction front. "We don't see any dislocations," Li says. This could be important because the generation and storage of dislocations can cause fatigue and limit the cycle life of an electrode.

Unlike conventional TEM imaging, the technique used in this work, developed in 2010 by Kushima and Li, makes it possible to observe battery components as they charge and discharge, which can reveal dynamic processes. "In the last four years, there has been a big explosion of using such in situ TEM techniques to study battery operations," Li says.

A better understanding of these dynamic processes could improve the performance of an electrode material by allowing better tuning of its properties, Li says.

Despite an incomplete understanding to date, lithium iron phosphate nanoparticles are already used at an industrial scale for lithium-ion batteries, Li explains. "The science is lagging behind the application," he says. "It's already scaled up and quite successful on the market. It's one of the success stories of nanotechnology."

"Compared to traditional lithium-ion, [lithium iron phosphate] is environmentally friendly, and very stable," Niu says. "But it's important for this material to be well understood."

While the discovery of the SSZ was made in LiFePO4, Li says, "The same principle may apply to other electrode materials. People are looking for high-power electrode materials, and such metastable states could exist in other electrode materials that are inert in bulk form. … The phenomenon discovered could be very general, and not specific to this material."

 

Story Source:

The above story is based on materials provided by Massachusetts Institute of Technology. The original article was written by David L. Chandler.

Total:1 pages  page: 1  

Previous:'Smart' lithium-ion battery's ability to prevent f…   Next: On Octob-17,GEB has sent 200 sets 36v 12ah lithium…
【Refresh】【Collection】【Print】 【Close Window】
 
Gebattery|LiFePO4|LiFePO4 battery|Polymer lithium battery|lithium-Cells|LiFePO4 18650|26650|power battery|Electric bicycle battery|Electric motorcycle battery|Energy storage battery|UPS|EPS|Power pack|Lithium battery production equipment|Lithium battery production machine |12V10AH|12V20AH|24V8AH|24V10AH|24V20AH|24V40AH|24V60AH36V8AH|36V10AH|36V12AH|36V15AH|36V20AH|36V30AH|36V40AH|36V50AH |48V10AH|48V20AH|48V30AH|48V40AH|48V50AH|48V60AH|48V100AH|48V200AH|72V20AH|72V40AH|144V100AH|300V100AH|360V100AH
CopyRight©2013 粤ICP备13004058号-1 Email: sales@gebattery.co Tel: +86-755-81762725,81762726,81762727 Fax: +86-755-81762723

Address: Fl. 6, Bld. 2, Chaohuilou Hi-tech Industry Park, Dalang, Longhua, Baoan District, Shenzhen 518109, P.R. China

    

 Carolyn
 Jaymia
 Angel
 Tony
 Andrew
 May
 Lisa
 Aftersales