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Doping of titania with manganese for improving cycling and rate performances in lithium-ion batteries
Chemical Physics ( IF 2.3 ) Pub Date : 2020-06-04 , DOI: 10.1016/j.chemphys.2020.110864
D.P. Opra , S.V. Gnedenkov , S.L. Sinebryukhov , A.B. Podgorbunsky , A.A. Sokolov , A.Yu. Ustinov , V.G. Kuryavyi , V.Yu. Mayorov , V.V. Zheleznov

Titanium dioxide have received a much attention for lithium-ion batteries due to safety as anode upon fast and low temperature cycling as well as appropriate stability during insertion and extraction of guest ions. However, TiO2 has low conductivity and sluggish diffusion of Li+. In order to eliminate these shortcomings, reducing of particle size and doping are considered as promising approaches. Herein, we investigate the effect of doping with manganese (atomic ratios of Mn/Ti = 0.05; 0.1; 0.2) on characteristics of anatase titania having nanoparticulate morphology. As found, Mn/Ti = 0.05 is optimal dopant concentration in terms of battery performance of titania: the capacity of 113 mAh g−1 was still maintained after 118 cycles at 1C that is rather higher as compared to undoped anatase. Such improved electrochemical behavior is associated with anatase lattice expansion due to Mn3+ incorporation and enhanced conductivity.



中文翻译:

锰掺杂二氧化钛可改善锂离子电池的循环性能和倍率性能

由于快速和低温循环时作为阳极的安全性以及在客体离子的插入和提取过程中的适当稳定性,二氧化钛已受到锂离子电池的广泛关注。但是,TiO 2的电导率低,Li +的扩散缓慢。为了消除这些缺点,减小粒径和掺杂被认为是有前途的方法。在本文中,我们研究了锰掺杂(Mn / Ti的原子比= 0.05; 0.1; 0.2)对具有纳米微粒形态的锐钛矿型二氧化钛特性的影响。如发现的那样,就二氧化钛的电池性能而言,Mn / Ti = 0.05是最佳掺杂剂浓度:在1 C进行118次循环后,仍保持113 mAh g -1的容量与未掺杂的锐钛矿相比,这要高得多。由于Mn 3+的引入和电导率的提高,这种改善的电化学行为与锐钛矿晶格膨胀有关。

更新日期:2020-07-14
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