Rice workforce exhibits that skinny nanotube movies cease dendrite progress from Li metallic anodes

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The Rice College lab of chemist James Tour has proven that skinny nanotube movies successfully cease dendrites that develop naturally from unprotected lithium metallic anodes in batteries. A paper on their work is printed within the journal Superior Supplies.

Right here, it’s proven that lithiated multiwall carbon nanotubes (Li‐MWCNTs) act as a managed Li diffusion interface that suppresses the expansion of Li dendrites by regulating the Li+ ion flux throughout cost/discharge biking at present densities between 2 and four mA cm−2.

A full Li‐S cell is fabricated to showcase the flexibility of the protected Li anode with the Li‐MWCNT interface, the place the total cells may assist pulse discharges at excessive currents and over 450 cycles at totally different charges with coulombic efficiencies near 99.9%. This work signifies that carbon supplies in lithiated types might be an efficient and easy method to the stabilization of Li metallic anodes.

—Salvatierra et al.


An illustration exhibits how lithium metallic anodes developed at Rice College are protected against dendrite progress by a movie of carbon nanotubes. Courtesy of the Tour Group.

Over time, dendrites can pierce the battery’s electrolyte core and attain the cathode, inflicting the battery to fail. That downside has each dampened using lithium metallic in industrial purposes and inspired researchers worldwide to resolve it.

One of many methods to gradual dendrites in lithium-ion batteries is to restrict how briskly they cost. Individuals don’t like that. They need to have the ability to cost their batteries shortly.

—James Tour

The Rice workforce’s resolution is easy, cheap and extremely efficient at stopping dendrite progress, Tour stated.

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What we’ve completed seems to be very easy. You simply coat a lithium metallic foil with a multi-walled carbon nanotube movie. The lithium dopes the nanotube movie, which turns from black to pink, and the movie in flip diffuses the lithium ions.

—James Tour

Bodily contact with lithium metallic reduces the nanotube movie, however balances it by including lithium ions, defined Rice postdoctoral researcher Rodrigo Salvatierra, co-lead creator of the paper with graduate pupil Gladys López-Silva. The ions distribute themselves all through the nanotube movie.

When the battery is in use, the movie discharges saved ions and the underlying lithium anode refills it, sustaining the movie’s potential to cease dendrite progress.


Pictures of lithium metallic anodes after 500 cost/discharge cycles in checks at Rice College present the expansion of dendrites is quenched within the anode at left, protected by a movie of carbon nanotubes. The unprotected lithium metallic anode at proper exhibits proof of dendrite progress. Courtesy of the Tour Group.

The tangled-nanotube movie successfully quenched dendrites over 580 cost/discharge cycles of a check battery with a sulfurized-carbon cathode the lab developed in earlier experiments. The researchers reported the total lithium metallic cells retained 99.eight% of their coulombic effectivity, the measure of how properly electrons transfer inside an electrochemical system.

The analysis was supported by the Air Pressure Workplace of Scientific Analysis, the Nationwide Institutes of Well being, the Nationwide Council of Science and Know-how, Mexico; the Nationwide Council for Scientific and Technological Growth, Ministry of Science, Know-how and Innovation and Coordination for the Enchancment of Increased Schooling Personnel, Brazil; and Celgard, LLC.

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Assets

  • R. V. Salvatierra, G. A. López‐Silva, A. S. Jalilov, J. Yoon, G. Wu, A.‐L. Tsai, J. M. Tour (2018) “Suppressing Li Metallic Dendrites By way of a Stable Li‐Ion Backup Layer” Adv. Mater. doi: 10.1002/adma.201803869


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