Coal sieving: Ideal anodes for high energies


image: Small-angle X-ray scattering patterns of (a) porous carbon (PC) and (b) SC anodes before and after (dotted line) 5 complete cycles at a current density of 50 mA g-1. Inset: the relative location of the SEI to the nanopores. SEI is a green irregular shape with solid yellow circles (sodium ions) inside. (c) 1st cycle charging curves of different SCs at a current density of 50 mA g-1. (d) Charge/discharge curves of a full Na3V2(PO4)3//SC-3 cell from 0.05 A g-1 to 1 A g-1.
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Credit: ©Science China Press

The exponential increase The implementation of renewable energy systems, such as wind and solar power, urgently requires the development of large-scale energy storage devices with flexibility, high energy conversion efficiency and simple maintenance. Among various candidates, due to the natural abundance and low cost of sodium reserves, sodium-ion batteries (SIBs) have recently attracted the attention of academia and industry as a sustainable battery supplement. lithium ion (LIB).

Non-graphitic carbons are the most promising candidate anodes for SIBs. However, challenged by their variable and complicated microstructures, what is the ideal carbon anode for SIBs that can play a role similar to what graphite does in lithium-ion batteries and how to rationally design the ideal carbon anodes are fundamental but remain poorly understood. This inevitably hinders the commercialization of SIBs.

Led by Prof. Quan-Hong Yang, Dr. Jun Zhang (Tianjin University) and Prof. Yong Yang (Xiamen University), a recent study proposed carbon sieving (SC), with highly tunable nanopores with an inlet narrow pore size, as a practical anode solution for high energy SIBs with expandable and reversible low potential charge/discharge plates (LPP, +/N / A). This study showed that the small pore inlet diameter (-1. A pore body diameter with an upper limit (~2.0 nm) has further been proven to ensure the reversibility of LPPs, essential for improving the cycle stability of SC anodes. More promisingly, the reported way of preparing SCs was potentially scalable to modify commercial porous carbons into practical anode materials, paving the way for the rapid commercialization of SIBs.

“The proposed carbon sieving is a conceptual advance for the design of carbon anodes for high-energy SIBs, and the potential to play a role similar to what graphite does in lithium-ion batteries.” Professor Quan-Hong Yang said: “The structural tunability makes carbon sieving also promising for practical use in high-energy or high-power lithium-ion batteries, potassium-ion batteries, etc.


See the article:

Screening carbons promise practical anodes with low potential expandable trays for sodium batteries

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