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8. Unlocking High‐Current Performance in Silicon Anode: Synergistic Phosphorus Doping and Nitrogen‐Doped Carbon Encapsulation to Enhance Lithium Diffusivity.

Author

Firdaus, Arief Muhammad, Hawari, Naufal Hanif, Adios, Celfi Gustine, Nasution, Paramadina Masihi, Peiner, Erwin, Wasisto, Hutomo Suryo, and Sumboja, Afriyanti

Abstract

The silicon (Si) offers enormous theoretical capacity as a lithium‐ion battery (LIB) anode. However, the low charge mobility in Si particles hinders its application for high current loading. In this study, ball‐milled phosphorus‐doped Si nanoparticles encapsulated with nitrogen‐doped carbon (P−Si@N−C) are employed as an anode for LIBs. P‐doped Si nanoparticles are first obtained via ball‐milling and calcination of Si with phosphoric acid. N‐doped carbon encapsulation is then introduced via carbonization of the surfactant‐assisted polymerization of pyrrole monomer on P‐doped Si. While P dopant is required to support the stability at high current density, the encapsulation of Si particles with N‐doped carbon is influential in enhancing the overall Li+ diffusivity of the Si anode. The combined approaches improve the anode's Li+ diffusivity up to tenfold compared to the untreated anode. It leads to exceptional anode stability at a high current, retaining 87 % of its initial capacity under a large current rate of 4000 mA g−1. The full‐cell comprising P−Si@N−C anode and LiFePO4 cathode demonstrates 94 % capacity retention of its initial capacity after 100 cycles at 1 C. This study explores the effective strategies to improve Li+ diffusivity for high‐rate Si‐based anode. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Mn-deficient ZnMn2O4/Zn0.5Mn0.5Fe2O4cathode for enhancing structural reversibility and stability of zinc-ion batteries

Author

Hawari, Naufal Hanif, Prayogi, Achmad, Irmawati, Yuyun, Persada, Pilar Bela, Ivandini, Tribidasari A., Zulfia, Anne, Judawisastra, Hermawan, Yan, Qingyu, and Sumboja, Afriyanti

Abstract

Aqueous zinc-ion batteries have surfaced as a viable energy storage technology due to their safety, eco-friendliness, and cost-effectiveness. Binary zinc manganite oxide (ZnMn2O4or ZMO) stands out as the potential cathode material owing to its considerable theoretical capacity and high operating voltage. However, high electrostatic repulsion of Zn2+ions within ZMO leads to sluggish diffusion and poor reversibility of Zn2+ions insertion/extraction that can reduce charge storage and overall cycling performance. This study addresses this challenge by introducing FeCl3during the synthesis to form ZMO/Zn0.5Mn0.5Fe2O4(ZMFO) cathode material. This cathode features Mn-deficient structures, which can reduce the electrostatic repulsion via low Mn occupancies and lattice parameters enlargement, thus facilitating Zn2+ions diffusion. Ex-situ X-ray diffraction analyses further show that the cathode is able to maintain good structural reversibility during the charge-discharge cycles. Additionally, the ZMO/ZMFO cathode exhibits smaller particle sizes than pristine ZMO, providing a wider surface area. The presence of ZMFO with a large unit cell volume can also enhance Zn storage capacity and accelerate Zn2+ions kinetics. Highlighting those advantages, aqueous zinc-ion batteries with ZMO/ZMFO cathode show a capacity of ~230 mAh g−1at 0.05 A g−1and retain 99 % of its initial capacity at 0.2 A g−1after 200 cycles of charge-discharge.

Published
2024
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