Dissecting the chemical strain in inactive components of sodium-ion battery cathodes

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-07-21 DOI:10.1016/j.scriptamat.2025.116880

Xiuling Shi , Jiaqi Zhu , Bingxu Chen , Bin Cao , Binfeng Lv , Zihan Wang , Sheng Sun , Kaikai Li , Tong-Yi Zhang

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Abstract

While chemical strain in the active material of sodium-ion battery (SIB) cathodes during ion insertion/extraction is minimal, inactive components can induce substantial overall strain, compromising stability and performance. This work takes NaNi_1/3Fe_1/3Mn_1/3O₂ (NFM) as a model cathode and dissects the chemical strain in inactive components by combining operando XRD and digital image correlation techniques to simultaneously measure the chemically induced phase transformation strain and overall strain. Results reveal considerable negative strain during initial charge and positive strain after discharge, and the positive residual strain accumulates over cycles. A mechanochemical model reveals that the chemical strain in inactive components far exceeds those in active materials, contributing to the large overall strain. This work introduces an innovative approach to quantify the chemical strain in the inactive components, enhances our understanding of electrochemical-mechanical coupling, and guides the development of mechanically robust SIB cathodes.

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剖析钠离子电池阴极非活性组分的化学应变

虽然在离子插入/提取过程中，钠离子电池（SIB）阴极活性材料中的化学应变很小，但非活性成分会引起大量的总应变，从而影响稳定性和性能。本文以NaNi1/3Fe1/3Mn1/3O2 （NFM）为模型阴极，结合operando XRD和数字图像相关技术，解剖非活性组分的化学应变，同时测量化学诱导相变应变和总应变。结果表明，在初始充电时存在较大的负应变，放电后存在较大的正应变，且正残余应变在循环过程中不断累积。力学化学模型表明，非活性组分中的化学应变远远超过活性组分中的化学应变，导致总应变较大。这项工作引入了一种创新的方法来量化非活性组分中的化学应变，增强了我们对电化学-机械耦合的理解，并指导了机械坚固SIB阴极的开发。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.