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Optimized activation of Li2MnO3 effectively boosting rate capability of xLi2MnO3∙(1-x)LiMO2 cathode
Nano Energy ( IF 16.8 ) Pub Date : 2021-06-10 , DOI: 10.1016/j.nanoen.2021.106240
Youchen Hao , Wen Liu , Qianyu Zhang , Xianyou Wang , Hong Yang , Liang Kou , Zhanyuan Tian , Le Shao , Hirbod Maleki Kheimeh Sari , Jingjing Wang , Hui Shan , Xifei Li

Poor rate capability and voltage decaying have been challenging for high energy/power density Li-rich Mn-based oxide (LMO) cathodes, restricting their application to a certain extent. Herein, a trace Bi-doping is introduced to mediate the release of O2 and ameliorate the transmission of electrons. As a result of appropriate Bi-doping, voltage fading is mitigated and cyclability is considerably enhanced. However, the common drawbacks between pristine and modified materials revealed the residual issues of cathode. That is, the slow kinetic Li2MnO3 phase is account for the poor rate capability of LMO and further restricted the capacity contribution of LMO due to the sandwiched position of LiMO2 phase in the two phase system. As further activation on the Li2MnO3 phase exhibited enhanced cyclability, this research can be a guideline for optimized LMO via focusing on the properties of Li2MnO3 component.



中文翻译:

Li 2 MnO 3 的优化活化有效提高了xLi 2 MnO 3 ∙(1-x)LiMO 2正极的倍率性能

对于高能量/功率密度的富锂锰基氧化物(LMO)正极而言,较差的倍率能力和电压衰减一直是一个挑战,在一定程度上限制了它们的应用。在此,微量Bi掺杂被引入以介导O 2的释放并改善电子的传输。由于适当的 Bi 掺杂,电压衰减得到缓解,循环能力得到显着增强。然而,原始材料和改性材料之间的共同缺点揭示了阴极的残留问题。也就是说,缓慢动力学的 Li 2 MnO 3相是 LMO 较差倍率能力的原因,并且由于 LiMO 2的夹层位置而进一步限制了 LMO 的容量贡献两相系统中的相。由于 Li 2 MnO 3相的进一步活化表现出增强的循环性,该研究可以通过关注 Li 2 MnO 3组分的性质来优化 LMO 。

更新日期:2021-06-19
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