Onion-Structured Si Anode Constructed with Coating by Li4Ti5O12 and Cyclized-Polyacrylonitrile for Lithium-Ion Batteries

Nanomaterials

Nurzhan Umirov¹  Sung-Soo Kim¹  Arailym Nurpeissova²  Aliya Mukanova²  Zhumabay Bakenov²  Gulnur Kalimuldina³ 

[1] Graduate School of Energy Science and Technology, Chungnam National University, 99 Daehak ave., Yuseong-gu, Daejeon 34134, Korea;National Laboratory Astana, Nazarbayev University, Nur-Sultan 010000, Kazakhstan;School of Engineering and Digital Sciences, Nazarbayev University, Nur-Sultan 010000, Kazakhstan;

关键词: silicon nanoparticles;    LTO;    cPAN;    onion-like structure;    nanostructures;    energy storage;   

DOI  :  10.3390/nano10101995

来源: DOAJ

【 摘 要 】

Low dimensional Si-based materials are very promising anode candidates for the next-generation lithium-ion batteries. However, to satisfy the ever-increasing demand in more powerful energy storage devices, electrodes based on Si materials should display high-power accompanied with low volume change upon operation. Thus far, there were no reports on the Si-based materials which satisfy the stated requirements. Hence, here, we report on modified onion-structured Si nanoparticles (SiNPs) co-coated with Li₄Ti₅O₁₂ (LTO) and cyclized polyacrylonitrile (cPAN) to bring the synergistic effect enhancing the conductivity, tolerance to volume change and stable performance. Obtained results suggest that the nanoparticles were conformally coated with both materials simultaneously and the thicknesses of the films were in a range of a few nanometers. Electrochemical tests show that the modified SiNPs deliver a high initial capacity of 2443 mAh g⁻¹ and stable capacity retention over 50 cycles with 95% Coulombic efficiency.

【 授权许可】

Unknown