Journal of Energy Chemistry ›› 2023, Vol. 79 ›› Issue (4): 83-91.DOI: 10.1016/j.jechem.2022.11.029

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Photoinduced Cu+/Cu2+ interconversion for enhancing energy conversion and storage performances of CuO based Li-ion battery

Qiuman Zhanga,1, Meng Weia,1, Qianwen Donga, Qiongzhi Gaoa, Xin Caia, Shengsen Zhanga, Teng Yuana, Feng Pengb,*, Yueping Fanga,*, Siyuan Yanga,*   

  1. aKey Laboratory for Biobased Materials and Energy of Ministry of Education, Guangdong Laboratory for Lingnan Modern Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, Guangdong, China;
    bSchool of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 51006, Guangdong, China
  • Received:2022-10-17 Revised:2022-11-17 Accepted:2022-11-21 Online:2023-04-15 Published:2023-05-30
  • Contact: * E-mail addresses: fpeng@gzhu.edu.cn (F. Peng), ypfang@scau.edu.cn (Y. Fang), siyuan_yang@scau.edu.cn (S. Yang).
  • About author:1These authors contributed equally to this work.

Abstract: Pursuing appropriate photo-active Li-ion storage materials and understanding their basic energy stor-age/conversion principle are pretty crucial for the rapidly developing photoassisted Li-ion batteries (PA-LIBs). Copper oxide (CuO) is one of the most popular candidates in both LIBs and photocatalysis. While CuO based PA-LIBs have never been reported yet. Herein, one-dimensional (1D) CuO nanowire arrays in situ grown on a three-dimensional (3D) copper foam support were employed as dual-functional photoanode for both ‘solar-to-electricity’ and ‘electricity-to-chemical’ energy conversion in the PA-LIBs. It is found that light energy can be indeed stored and converted into electrical energy through the assembled CuO based PA-LIBs. Without external power source, the photo conversion effi-ciency of CuO based photocell reaches about 0.34%. Impressively, at a high current density of 4000 mA g-1, photoassisted discharge and charge specific capacity of CuO based PA-LIBs respectively receive 64.01% and 60.35% enhancement compared with the net electric charging and discharging pro-cess. Mechanism investigation reveals that photogenerated charges from CuO promote the interconver-sion between Cu2+ and Cu+ during the discharging/charging process, thus forcing the lithium storage reaction more completely and increasing the specific capacity of the PA-LIBs. This work can provide a general principle for the development of other high-efficient semiconductor-based PA-LIBs.

Key words: Li-ion batteries, Energy conversion and storage, Photo rechargeable, Electrochemistry, Copper oxide