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Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Scientists develop Nanochains to increase lithium-ion battery capacity

Scientists develop Nanochains to increase lithium-ion battery capacity



  Coin cell battery

Artistic depiction of a copper cell coin cell battery (left) containing a black nano chain structure, which researchers found could increase battery capacity and reduce charging time. Credit: Purdue University / Henry Haman Illustration

How long the battery life of your phone or computer depends on how much lithium ion can be stored in the negative battery electrode. If the battery is depleted of these ions, it cannot generate electrical current to start the device and ultimately fail.

Materials with greater lithium-ion storage capacity are too heavy or irregular to replace graphite, an electrode material currently used in modern batteries.

Scientists and engineers at Purdue University have introduced a potential way for these materials to be restructured into a new electrode design that will allow them to increase the life of the battery, make it more stable and shorten its charge.

Appearing as a cover of the September issue of Applied Nano Materials, it has created a network-like structure called an antimony "nano chain", a metalloid known to increase lithium-ion battery capacity.

Researchers compared nanowire electrodes with graphite electrodes, finding that when coin cell batteries with a nanochannel electrode are charged in just 30 minutes, they reach d can use lithium-ion capacity for 1

00 charge-discharge cycles.

Some types of commercial batteries already use carbon-metal composites similar to negative metal-metal electrodes, but the material tends to expand to three times the amount required in lithium ions, which causes a safety hazard when charging the battery.

"You want to install this type of battery extensions on your smartphone. That way you don't carry something dangerous, "said Vilas Paul, assistant professor of chemical engineering at Purdue.

  Nanocharin battery electrodes

A new method can allow better materials to assemble battery electrodes by turning them into a nano -chain structure, the black material on this copper electrode of a coin cell Credit: Image of Purdue University / Kayla Wiles

Through the use of chemical compounds – reducing and nucleating agents – Purdue scientists bind tiny particles of antimony into a nano-chain form to adjust n The special reducing agent used by the team, ammonia-borane, is responsible for creating blank spaces – pores inside the nano-chain that accommodate the expansion and suppress electrode damage.

antimony compounds, ie finding that only the antimony chloride produced the structure of the nano-chain.

"Our procedure for making nanoparticles consistently provides chain structures," says PV Ramachandr n, a professor of organic chemistry at Purdue.

The nanochannel also maintains lithium-ion capacity stable for at least 100 charge-charge cycles. "There is essentially no change from cycle 1 to cycle 100, so we have no reason to think that cycle 102 will not be the same," says Paul.

Henry Haman, a PhD student in chemistry, synthesizes the antimony nanoshell Structure, and Jassiel Rodriguez, a PhD candidate in chemical engineering at Purdue, tested the performance of an electrochemical battery.

, the researchers say. The team plans to test the design in battery packs next year.

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This work was financially supported by the Herbert K. Brown Center for Borane Research.

Reference: "Three-dimensional Lithium-Ion Antimony Nanoscale" by Jassiel R. Rodriguez, Henry J. Hamann, Garrett Mitchell, Volkan Ortalan, Vilas G. Pol and P. Veeraraghavan Ramachandran, 12 August 2019 ACS Applied Nano Materials .
doi: 10.1021 / acsanm.9b01316


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