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锂离子电池LiNiMnO正极材料的熵变特性

Entropy Change Characteristics of the LiNiMnO Cathode Material for Lithium-Ion Batteries.

作者信息

Mao Jing, Zhang Peng, Liu Xin, Liu Yanxia, Shao Guosheng, Dai Kehua

机构信息

School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China.

Zhengzhou Institute of Emerging Industrial Technology, Zhengzhou 450001, China.

出版信息

ACS Omega. 2020 Feb 20;5(8):4109-4114. doi: 10.1021/acsomega.9b03794. eCollection 2020 Mar 3.

DOI:10.1021/acsomega.9b03794
PMID:32149239
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7057695/
Abstract

Lithium-ion batteries are widely used in the field of new energy vehicles and energy storage. Understanding the electrode reaction of lithium-ion batteries is the key to improve their cycle life and safety. Direct measurement of thermodynamic data of the electrode reaction is a practical, economical, and nondestructive method for electrode characterization. In this paper, the open-circuit voltage of the LiNiMnO/Li half-cell is measured at different discharge states and different temperatures. The d/d-SOD (state of discharge) relation curves are fitted linearly by the least square method, and the entropy change values of different SODs are calculated. Finally, the Gibbs free energy and enthalpy change of different SODs are obtained. The electrode reaction of LiNiMnO in different SODs was discussed by the entropy change in different SODs. According to the evolution trend of Δ, the lithium intercalation reaction of LiNiMnO may be a single-phase solid solution reaction rather than a two-phase reaction. Finally, the reversible heat generation at different current values and SODs are calculated.

摘要

锂离子电池在新能源汽车和储能领域有着广泛应用。了解锂离子电池的电极反应是提高其循环寿命和安全性的关键。直接测量电极反应的热力学数据是一种用于电极表征的实用、经济且无损的方法。本文在不同放电状态和不同温度下测量了LiNiMnO/Li半电池的开路电压。通过最小二乘法对d/d-SOD（放电状态）关系曲线进行线性拟合，并计算不同SODs的熵变值。最终得到不同SODs的吉布斯自由能和焓变。通过不同SODs下的熵变讨论了LiNiMnO在不同SODs下的电极反应。根据Δ的演变趋势，LiNiMnO的锂嵌入反应可能是单相固溶体反应而非两相反应。最后计算了不同电流值和SODs下的可逆发热。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9686/7057695/794aaa84b2eb/ao9b03794_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9686/7057695/02e9e3598371/ao9b03794_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9686/7057695/e9595722cb8e/ao9b03794_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9686/7057695/0610711ba609/ao9b03794_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9686/7057695/be310e953b27/ao9b03794_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9686/7057695/ac68345daaa8/ao9b03794_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9686/7057695/794aaa84b2eb/ao9b03794_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9686/7057695/02e9e3598371/ao9b03794_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9686/7057695/e9595722cb8e/ao9b03794_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9686/7057695/0610711ba609/ao9b03794_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9686/7057695/be310e953b27/ao9b03794_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9686/7057695/ac68345daaa8/ao9b03794_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9686/7057695/794aaa84b2eb/ao9b03794_0006.jpg

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本文引用的文献

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Materials for lithium-ion battery safety.锂离子电池安全材料。
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