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Stable Silicon Anode for Lithium-Ion Batteries through Covalent Bond Formation with a Binder via Esterification. | LitMetric

Stable Silicon Anode for Lithium-Ion Batteries through Covalent Bond Formation with a Binder via Esterification.

ACS Appl Mater Interfaces

Department of Materials Science and Engineering and Research Institute of Advanced Materials , Seoul National University, Seoul 151-744 , Republic of Korea.

Published: July 2019

AI Article Synopsis

  • Silicon (Si) is a promising candidate for lithium-ion battery anodes due to its high capacity and low discharge potential, but its significant volume changes during charging and discharging make it challenging for commercial use.
  • Researchers created a high-performance Si anode by forming covalent bonds between Si nanopowder and a polymer binder, using polyacrylic acid and piranha solution to enhance bonding and performance.
  • The resulting electrode demonstrated strong cycling stability and capacity, achieving 1500 mA h g after 500 cycles, and was further tested in a full cell with a LiNiMnCoO cathode for practical application.

Article Abstract

Silicon (Si) is considered to be one of the most promising anode candidates for next-generation lithium-ion batteries because of its high theoretical specific capacity and low discharge potential. However, its poor cyclability, caused by tremendous volume change during cycling, prevents commercial use of the Si anode. Herein, we demonstrate a high-performance Si anode produced via covalent bond formation between a commercially available Si nanopowder and a linear polymeric binder through an esterification reaction. For efficient ester bonding, polyacrylic acid, composed of -COOH groups, is selected as the binder, Si is treated with piranha solution to produce abundant -OH groups on its surface, and sodium hypophosphite is employed as a catalyst. The as-fabricated electrode exhibits excellent high rate capability and long cycle stability, delivering a high capacity of 1500 mA h g after 500 cycles at a high current density of 1000 mA g by effectively restraining the susceptible sliding of the binder, stabilizing the solid electrolyte interface layer, preventing the electrode delamination, and suppressing the Si aggregation. Furthermore, a full cell is fabricated with as-fabricated Si as an anode and commercially available LiNiMnCoO as a cathode, and its electrochemical properties are investigated for the possibility of practical use.

Download full-text PDF

Source
http://dx.doi.org/10.1021/acsami.9b03866DOI Listing

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