Unveiling the aging memory effect in Lithium-ion batteries: A thermodynamic approach

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Solid State Ionics Pub Date : 2025-02-01 DOI:10.1016/j.ssi.2024.116767

Kenza Maher, Ameni Boumaiza

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引用次数: 0

Abstract

We discovered that lithium-ion batteries (LIBs) retain a thermodynamic trace of their aging process, a phenomenon referred to here as the “aging memory effect.” This memory effect can be revealed by measuring the entropy and enthalpy of aged cells at two well-defined open-circuit potentials (OCP):

E_{0}^{1}

= 3.87 V and

E_{0}^{2}

= 3.94 V.

The study examined LIB cells consisting of graphite anode and lithium cobalt oxide (LCO) cathode. We observed that the variation in entropy and enthalpy at

E_{0}^{1}

and

E_{0}^{2}

, strongly depends on the cells' aging history.

E_{0}^{1}

and

E_{0}^{2}

correspond to the potential onset of the phase transitions in the anode and cathode materials, respectively. These phase transitions serve as critical indicators that reflect the internal alterations and degradation mechanisms occurring within the battery over time. By meticulously monitoring the entropy and enthalpy changes at

E_{0}^{1}

and

E_{0}^{2},

we can retrace the battery's aging memory and identify the capacity-limiting electrode. Our findings indicate that these thermodynamic measurements can provide detailed insights into the electrodes' degradation pathways and phase transition behaviors. This knowledge is crucial for developing strategies to enhance the longevity and performance of LIBs.

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揭示锂离子电池的老化记忆效应：一个热力学方法

我们发现锂离子电池（lib）保留了其老化过程的热力学痕迹，这种现象在这里被称为“老化记忆效应”。这种记忆效应可以通过在两个明确的开路电位（OCP） E01 = 3.87 V和E02 = 3.94 V下测量老化细胞的熵和焓来揭示。该研究考察了由石墨阳极和锂钴氧化物（LCO）阴极组成的锂离子电池。我们观察到E01和E02的熵和焓的变化强烈依赖于细胞的老化历史。E01和E02分别对应于阳极和阴极材料中相变的电位开始。这些相变是反映电池内部随时间变化和降解机制的关键指标。通过对e01和E02处熵焓变化的细致监测，我们可以追溯电池的老化记忆，识别出容量限制电极。我们的研究结果表明，这些热力学测量可以为电极的降解途径和相变行为提供详细的见解。这些知识对于制定提高lib寿命和性能的策略至关重要。

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

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.