arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.3428cond-mat.mtrl-sci
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Li(x)Mn(2)O(4)(100)表面上有机溶剂分解初始阶段的第一性原理模拟

First Principles Modeling of the Initial Stages of Organic Solvent Decomposition on Li(x)Mn(2)O(4) (100) Surfaces

Kevin Leung

摘要:

采用密度泛函理论和从头算分子动力学模拟研究了碳酸乙烯酯(EC)在尖晶石Li(0.6)Mn(2)O(4)(100)表面上分解的初始步骤. EC是锂离子电池中使用的电解质的关键组分。我们预测轻微放热EC键断裂事件在此氧化物方面,这有利于随后的EC氧化和质子转移到氧化物表面。质子和部分分解的EC片段都削弱了Mn-O离子键合网络。讨论了电解质在阴极表面分解形成的界面膜和Li(x)Mn(2)O(4)在功率循环过程中的溶解。

英文摘要:

Density functional theory and ab initio molecular dynamics simulations are applied to investigate the initial steps of ethylene carbonate (EC) decomposition on spinel Li(0.6)Mn(2)O(4) (100) surfaces. EC is a key component of the electrolyte used in lithium ion batteries. We predict an slightly exothermic EC bond breaking event on this oxide facet, which facilitates subsequent EC oxidation and proton transfer to the oxide surface. Both the proton and the partially decomposed EC fragment weaken the Mn-O ionic bonding network. Implications for interfacial film made of decomposed electrolyte on cathode surfaces, and Li(x)Mn(2)O(4) dissolution during power cycling, are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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