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Nanotechnology in Batteries(Unit 5)

By Will Soutter

Nanotechnology can play a significant role in the achievement of specific performance objectives in batteries. Conventionally, graphite powder has been used as an intercalation material on the negative electrode for lithium ion batteries. The rate of removal or insertion of lithium and the battery capacity can be improved by replacing micrometer-sized powder with carbon nanomaterials such as carbon nanotubes. Since carbon nanotubes have a high surface area, they can bind much higher concentrations of lithium. Nanowires made of titanium dioxide (TiO2), vanadium oxide (V2O5) or tin oxide (SnO) are also promising as negative electrode materials.

Commercial development of many of these materials is still in the early stages - one of the challenges in making fundamental technology changes to a giant industry like the automotive industry is that any new technology has to be ready to adapt to the huge scales of manufacturing involved. Presently available commercial oxide materials are promising candidates for electrode materials, but most of them are expensive or have safety limitations. Li(NiCoAl)O2, Li (NiMnCo)O2, LiMn2O4, Li(AlMn)2O4 or LiCo2O4 are good examples of such compounds. The nanostructuring of these materials has been shown to significantly improve their intercalation capacity.

Using nanostructured materials to improve the current density of electrodes for a number of reasons - it reduces the diffusion path for the lithium ions, increasing their mobility, and also tends to increase electrical conductivity, making the electrochemical reaction occur much more efficiently. A variety of nanostructured materials such as nanotubes, nanowires, nanopillars, nanoparticles and mesopores have been examined as candidate materials for both positive and negative electrodes. By varying the properties of the electrodes, like morphology, and surface area, researchers are aiming to find optimum compositions to squeeze as much performance as possible out of batteries which are as affordable and as light and compact as possible.

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(Unit 6)

With this project, ZF is making use of its long-standing know-how of adaptive dampers. ZF is a global leader in driveline and chassis technology with 121 production companies in 26 countries. More than 2.2 million dampers has been produced for the following customers: Alpina, Audi, Bentley, BMW, Ferrari, Maserati,Opel, Rolls-Royce, Mercedes-Benz, Porsche and Volkswagen. The company expects an annual production of more than three million CDC units for passenger car applications alone by 2016. In addition, there are ZF systems for buses, trucks, agricultural machines and motorcycles.

Notes:

Levant Power Corp. is an emerging technology company headquartered in Woburn, Massachusetts working to develop the world's first fully active, regenerative suspension for the automotive, trucking, mass transit, and defense industries. Levant Power was founded in 2009 out of the Massachusetts Institute of Technology.

ZF (ZF Friedrichshafen AG) is a global leader in driveline and chassis technology with 121 production companies in 26 countries. ZF is one of the 10 largest automotive suppliers worldwide.

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