Light-Motivated SnO2/TiO2 Heterojunctions Enabling the Breakthrough in Energy Density for Lithium-Ion Batteries

被引：106

作者：

Hu, Chen ^{[1
]}

Chen, Ling ^{[2
]}

Hu, Yanjie ^{[1
]}

Chen, Aiping ^{[1
]}

Chen, Long ^{[2
]}

Jiang, Hao ^{[1
]}

Li, Chunzhong ^{[1
,2
]}

机构：

[1] East China Univ Sci & Technol, Frontiers Sci Ctr Materiobiol & Dynam Chem, Sch Mat Sci & Engn, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

[2] East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Chem Engn, Shanghai 200237, Peoples R China

来源：

ADVANCED MATERIALS | 2021年 / 33卷 / 49期

基金：

中国国家自然科学基金;

关键词：

cycling stability; energy density; light-irradiation; lithium-ion batteries; SnO; (2); RECHARGEABLE LITHIUM;

D O I：

10.1002/adma.202103558

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Powering lithium-ion batteries (LIBs) by light-irradiation will bring a paradigm shift in energy-storage technologies. Herein, a photoaccelerated rechargeable LIB employing SnO2/TiO2 heterojunction nanoarrays as a multifunctional anode is developed. The electron-hole pairs generated by the LixTiO2 (x >= 0) under light irradiation synergistically enhance the lithiation kinetics and electrochemical reversibility of both SnO2 and TiO2. Specifically, the electrons can quickly pour into the SnO2 and the generated Sn due to the more positive conduction band potentials (vs TiO2), and mean while the holes also promote the intercalation of Li+ into TiO2 by reaching charge balance. A remarkable increase in areal specific capacity is therefore achieved from 1.91 to 3.47 mAh cm(-2) at 5 mA cm(-2). More impressively, there is no capacity loss even through 100 cycles, which is the best report for photorechargeable LIBs to date, owing to the strong and stable photoresponse current. This finding exhibits a feasible pathway to break the limitation in the energy density of LIBs by the efficient conversion and storage of solar energy.

引用

页数：8

共 49 条

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