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Vol. 17 (2025)

Efficient and Stable Photoassisted Lithium-Ion Battery Enabled by Photocathode with Synergistically Boosted Carriers Dynamics

https://doi.org/10.1007/s40820-024-01570-7
Zelin Ma
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi’an 710072, People’s Republic of China
Shiyao Wang
State Key Laboratory of Solidification Processing, School of Materials Science and Engineering Department, Northwestern Polytechnical University, Xi’an 710072, People’s Republic of China
Zhuangzhuang Ma
Key Laboratory of Applied Surface and Colloid Chemistry, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, National Ministry of Education, Shaanxi Normal University, Xi’an 710119, People’s Republic of China
Juan Li
State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, People’s Republic of China
Luomeng Zhao
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi’an 710072, People’s Republic of China
Zhihuan Li
State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, People’s Republic of China
Shiyuan Wang
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi’an 710072, People’s Republic of China
Yazhou Shuang
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi’an 710072, People’s Republic of China
Jiulong Wang
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi’an 710072, People’s Republic of China
Fang Wang
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi’an 710072, People’s Republic of China
Weiwei Xia
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi’an 710072, People’s Republic of China
Jie Jian
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi’an 710072, People’s Republic of China
Yibo He
State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, People’s Republic of China
Junjie Wang
State Key Laboratory of Solidification Processing, School of Materials Science and Engineering Department, Northwestern Polytechnical University, Xi’an 710072, People’s Republic of China
Pengfei Guo
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi’an 710072, People’s Republic of China
Hongqiang Wang
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi’an 710072, People’s Republic of China

Corresponding Author: Hongqiang Wang

hongqiang.wang@nwpu.edu.cn

Nano-Micro Letters, Vol. 17 (2025), Article Number: 74

Abstract

Efficient and stable photocathodes with versatility are of significance in photoassisted lithium-ion batteries (PLIBs), while there is always a request on fast carrier transport in electrochemical active photocathodes. Present work proposes a general approach of creating bulk heterojunction to boost the carrier mobility of photocathodes by simply laser assisted embedding of plasmonic nanocrystals. When employed in PLIBs, it was found effective for synchronously enhanced photocharge separation and transport in light charging process. Additionally, experimental photon spectroscopy, finite difference time domain method simulation and theoretical analyses demonstrate that the improved carrier dynamics are driven by the plasmonic-induced hot electron injection from metal to TiO2, as well as the enhanced conductivity in TiO2 matrix due to the formation of oxygen vacancies after Schottky contact. Benefiting from these merits, several benchmark values in performance of TiO2-based photocathode applied in PLIBs are set, including the capacity of 276 mAh g−1 at 0.2 A g−1 under illumination, photoconversion efficiency of 1.276% at 3 A g−1, less capacity and Columbic efficiency loss even through 200 cycles. These results exemplify the potential of the bulk heterojunction strategy in developing highly efficient and stable photoassisted energy storage systems.


Highlights:
1 Developing a universal bulk heterojunction strategy to create oxygen vacancies by embedding laser-manufactured metal nanocrystals into the TiO2 matrix.
2 Proposing a new mechanism based on plasmonic-induced hot electron injection and enhanced conductivity from Schottky contact-derived oxygen vacancies.
3 Establishing several benchmark values for the performance of TiO2-based photocathodes in photoassisted lithium-ion batteries.

Keywords

Photoassisted lithium-ion batteries Bulk heterojunction Carrier dynamics TiO2 nanofiber Plasmonic metal nanocrystals
Ma, Zelin, Shiyao Wang, Zhuangzhuang Ma, Juan Li, Luomeng Zhao, Zhihuan Li, Shiyuan Wang, Yazhou Shuang, Jiulong Wang, Fang Wang, Weiwei Xia, Jie Jian, Yibo He, Junjie Wang, Pengfei Guo, and Hongqiang Wang. 2024. “Efficient and Stable Photoassisted Lithium-Ion Battery Enabled by Photocathode With Synergistically Boosted Carriers Dynamics”. Nano-Micro Letters 17 (November):74. https://doi.org/10.1007/s40820-024-01570-7.
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