Light vs Heat: Dissecting the De-intercalation in Photo-rechargeable Batteries

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nano Letters Pub Date : 2025-01-06 DOI:10.1021/acs.nanolett.4c04013

Amar Kumar, Shuvadip Pradhan, Siddharth Pandya, Raheel Hammad, Soumya Ghosh, Tharangattu N. Narayanan

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Abstract

Does light or heat play a seminal role in photo-rechargeable batteries? This study unravels the effects of light in the exciton formation and separation processes in a photocathode, leading to the charging or de-intercalation of Li⁺ ions in a lithium-ion battery. Light induced oxidation of Ti³⁺ to Ti⁴⁺ in the Li_x(TiS₂–TiO₂) heterostructure cathode is shown here, while heating does not elicit such changes. With the aid of photogenerated electrons at the cathode, the de-lithiated Li⁺ ions from Li_x(TiS₂–TiO₂) get intercalated in the graphite anode during the photocharging process. Direct or passive heating leads to the degradation of the cathode electrolyte interface (CEI), instigating enhancement in open circuit potential. In contrast, photocharging leaves the organic electrolytes and CEI unaffected. Hence energy efficient photo-electrochemical energy systems can be built by carefully isolating the effects of heat and light in solar radiation, as dictated by this study.

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光与热：剖析光可充电电池的脱嵌现象

光或热在光充电电池中起着重要作用吗？本研究揭示了光在光电阴极激子形成和分离过程中的影响，从而导致锂离子电池中Li+离子的充电或脱插。在Lix（TiS2-TiO2）异质结构阴极中，光诱导Ti3+氧化为Ti4+，而加热不会引起这种变化。在阴极的光生电子的帮助下，Lix（TiS2-TiO2）的去锂化Li+离子在光充电过程中嵌入石墨阳极。直接加热或被动加热导致阴极电解质界面（CEI）的退化，引起开路电位的增强。相比之下，光充电不会影响有机电解质和CEI。因此，正如这项研究所指示的那样，通过仔细隔离太阳辐射中的热和光的影响，可以建立节能的光电化学能源系统。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.