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Evidence for the influence of polaron delocalization on the electrical transport in LiNi0.4+xMn0.4-xCo0.2O2.
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2020-01-06 , DOI: 10.1039/c9cp05768d Tao Feng 1 , Liping Li 1 , Quan Shi 2 , Shengde Dong 3 , Baoyun Li 1 , Ke Li 1 , Guangshe Li 1
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2020-01-06 , DOI: 10.1039/c9cp05768d Tao Feng 1 , Liping Li 1 , Quan Shi 2 , Shengde Dong 3 , Baoyun Li 1 , Ke Li 1 , Guangshe Li 1
Affiliation
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Polaron delocalization in layered transition-metal oxides can considerably impact their physical properties and technological applications. Herein, we present the evidence for the influence of polaron delocalization on the electrical transport of layered oxides LiNi0.4+xMn0.4-xCo0.2O2, an active cathode material, by controlling the chemical compositions. We find that the chemical composition at x = 0.3 exhibits a sharp increment in electronic conductivity of four orders of magnitude at room temperature with respect to that at x = 0. We attribute the increased electronic conductivity to a low hopping energy in addition to a weak electron-phonon interaction. The weakened electron-phonon interaction is the source of polaron delocalization in LiNi0.4+xMn0.4-xCo0.2O2, which became improved with increasing x due to the increased polaron sizes. Moreover, it is also suggested that the polaron delocalization may have a relationship with the strong Jahn-Teller distortion induced by Ni3+. The analysis of temperature dependent electrical transport within the framework of the small polaron hopping conduction model enables us to comprehend the influence of polaron delocalization on the electrical transport pertinent to the applications of layered oxide materials.
中文翻译：
极化子离域对LiNi0.4 + xMn0.4-xCo0.2O2中电输运的影响的证据。
层状过渡金属氧化物中的极化子离域化会极大地影响其物理性质和技术应用。在这里，我们通过控制化学成分，提供了极化子离域对层状氧化物LiNi0.4 + xMn0.4-xCo0.2O2（一种活性阴极材料）的电传输的影响的证据。我们发现，x = 0.3时的化学成分在室温下相对于x = 0时的化学电导率显示出四个数量级的急剧增加。我们将增加的电子电导率归因于弱的跳变能量和弱的跃迁能。电子-声子相互作用。电子-声子相互作用减弱是LiNi0.4 + xMn0.4-xCo0.2O2中极化子离域的根源，由于极化子尺寸的增加，随着x的增加，极化子离域化得到了改善。而且，也表明极化子离域可能与Ni3 +引起的强Jahn-Teller畸变有关。在小极化子跳跃传导模型的框架内对温度相关的电传输的分析使我们能够理解极化子离域化对与层状氧化物材料的应用有关的电传输的影响。
更新日期：2020-01-06
中文翻译：
极化子离域对LiNi0.4 + xMn0.4-xCo0.2O2中电输运的影响的证据。
层状过渡金属氧化物中的极化子离域化会极大地影响其物理性质和技术应用。在这里，我们通过控制化学成分，提供了极化子离域对层状氧化物LiNi0.4 + xMn0.4-xCo0.2O2（一种活性阴极材料）的电传输的影响的证据。我们发现，x = 0.3时的化学成分在室温下相对于x = 0时的化学电导率显示出四个数量级的急剧增加。我们将增加的电子电导率归因于弱的跳变能量和弱的跃迁能。电子-声子相互作用。电子-声子相互作用减弱是LiNi0.4 + xMn0.4-xCo0.2O2中极化子离域的根源，由于极化子尺寸的增加，随着x的增加，极化子离域化得到了改善。而且，也表明极化子离域可能与Ni3 +引起的强Jahn-Teller畸变有关。在小极化子跳跃传导模型的框架内对温度相关的电传输的分析使我们能够理解极化子离域化对与层状氧化物材料的应用有关的电传输的影响。
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