Graphite–Si@TiO2 Core–Shell Nanoparticles as Composite Anode for Li‐Ion Batteries: Postcycling Analysis

IF 3.6 4区工程技术 Q3 ENERGY & FUELS

Energy technology Pub Date : 2024-08-01 DOI:10.1002/ente.202400874

Bhavya Nidhi Vats, Raghvendra Gupta, Amit Gupta, Shahab Fatima, Deepak Kumar

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Abstract

The present work deals with the postcycling analysis of the graphite‐based composite anodes, graphite reinforced with bare silicon nanoparticles (GrSi), and Si@TiO2 core–shell nanoparticles (GrCS), for lithium‐ion batteries. The electrochemical behavior is recorded through galvanostatic charge–discharge and electrochemical impedance spectroscopy (EIS) tests. The postcyclic analysis is done using material and structural characterization. The GrSi anode demonstrates a higher initial specific capacity but lower cyclic stability relative to the GrCS anode. The capacity retention for the GrSi anode is ≈57%, while for the GrCS anode it is ≈75%. After cycling, the EIS analysis indicates that GrSi anode exhibits higher resistance than GrCS anodes. The cross‐sectional appearance of cycled anodes reveals minimal changes in the surface morphology of the GrCS anode, with a ≈75% thickness increase for the GrSi anode and ≈35% for the GrCS anode. The changed electrochemical behavior is attributed to the change in the composition of the solid–electrolyte interphase layer, as confirmed by X‐ray photo spectroscopy, and minor loss in crystallinity of GrCS anode material, as confirmed by X‐ray diffraction. The study provides insights into the mechanisms governing material degradation during the electrochemical processes in the composite anodes.

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石墨-硅@二氧化钛核壳纳米粒子作为锂离子电池的复合负极：循环后分析

本研究涉及锂离子电池用石墨基复合阳极、裸硅纳米颗粒增强石墨（GrSi）和 Si@TiO2 核壳纳米颗粒（GrCS）的循环后分析。电化学行为通过电静态充放电和电化学阻抗谱（EIS）测试进行记录。循环后分析则通过材料和结构表征完成。与 GrCS 阳极相比，GrSi 阳极显示出更高的初始比容量，但循环稳定性较低。GrSi 阳极的容量保持率≈57%，而 GrCS 阳极的容量保持率≈75%。循环后的 EIS 分析表明，GrSi 阳极的电阻高于 GrCS 阳极。循环阳极的横截面外观显示，GrCS 阳极的表面形态变化极小，GrSi 阳极的厚度增加了 ≈75%，而 GrCS 阳极的厚度增加了 ≈35%。电化学行为的变化归因于固体-电解质相间层成分的变化（X 射线光光谱证实了这一点），以及 GrCS 阳极材料结晶度的轻微损失（X 射线衍射证实了这一点）。这项研究有助于深入了解复合阳极电化学过程中的材料降解机制。

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来源期刊

Energy technology ENERGY & FUELS-

CiteScore

7.00

自引率

5.30%

发文量

审稿时长

1.3 months

期刊介绍： Energy Technology provides a forum for researchers and engineers from all relevant disciplines concerned with the generation, conversion, storage, and distribution of energy. This new journal shall publish articles covering all technical aspects of energy process engineering from different perspectives, e.g., new concepts of energy generation and conversion; design, operation, control, and optimization of processes for energy generation (e.g., carbon capture) and conversion of energy carriers; improvement of existing processes; combination of single components to systems for energy generation; design of systems for energy storage; production processes of fuels, e.g., hydrogen, electricity, petroleum, biobased fuels; concepts and design of devices for energy distribution.