当前位置：
X-MOL 学术
›
J. Am. Chem. Soc.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Lithium Deficiencies Engineering in Li-Rich Layered Oxide Li1.098Mn0.533Ni0.113Co0.138O2 for High Stability Cathode
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2019-06-15 , DOI: 10.1021/jacs.9b04974 Pengfei Liu 1 , Hong Zhang 2 , Wei He 1 , Tengfei Xiong 3 , Yong Cheng 1 , Qingshui Xie 1 , Yating Ma 1 , Hongfei Zheng 1 , Laisen Wang 1 , Zi-Zhong Zhu 4 , Yong Peng 2 , Liqiang Mai 3 , Dong-Liang Peng 1
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2019-06-15 , DOI: 10.1021/jacs.9b04974 Pengfei Liu 1 , Hong Zhang 2 , Wei He 1 , Tengfei Xiong 3 , Yong Cheng 1 , Qingshui Xie 1 , Yating Ma 1 , Hongfei Zheng 1 , Laisen Wang 1 , Zi-Zhong Zhu 4 , Yong Peng 2 , Liqiang Mai 3 , Dong-Liang Peng 1
Affiliation
|
Li-rich layered oxides have been on focus because of their high specific capacity. However, they usually suffer from poor kinetics, severe voltage decay and capacity fading. Herein, a long-neglected Li-deficient method is demonstrated to address these problems by simply reducing the lithium content. Appropriate lithium vacancies can improve dynamics features, induce in-situ surface spinel coating and nickel doping in the bulk. Therefore, the elaborately designed Li1.098Mn0.533Ni0.113Co0.138O2 cathode possesses improved initial Coulombic efficiency, excellent rate capability, largely suppressed voltage decay and outstanding long-term cycling stability. Specifically, it shows a superior capacity retention of 93.1% after 500 cycles at 1 C (250 mA g-1) with respect to the initial discharge capacity (193.9 mA h g-1) and the average voltage still exceeds 3.1 V. In addition, the discharge capacity at 10 C can be as high as 132.9 mA h g-1. More importantly, Li-deficient cathode can also serve as a prototype for further performance enhancement as there are plenty of vacancies.
中文翻译：
用于高稳定性阴极的富锂层状氧化物 Li1.098Mn0.533Ni0.113Co0.138O2 中的锂缺陷工程
富锂层状氧化物因其高比容量而备受关注。然而，它们通常具有较差的动力学、严重的电压衰减和容量衰减。在此，证明了一种长期被忽视的缺锂方法可以通过简单地降低锂含量来解决这些问题。适当的锂空位可以改善动力学特征，诱导原位表面尖晶石涂层和镍掺杂。因此，精心设计的 Li1.098Mn0.533Ni0.113Co0.138O2 正极具有提高的初始库仑效率、优异的倍率性能、大幅抑制电压衰减和出色的长期循环稳定性。具体而言，它在 1 C (250 mA g-1) 下循环 500 次后显示出相对于初始放电容量 (193. 9 mAh g-1)，平均电压仍超过3.1 V。此外，10 C下的放电容量可高达132.9 mAh g-1。更重要的是，由于存在大量空位，缺锂正极也可以作为进一步提高性能的原型。
更新日期：2019-06-15
中文翻译：
用于高稳定性阴极的富锂层状氧化物 Li1.098Mn0.533Ni0.113Co0.138O2 中的锂缺陷工程
富锂层状氧化物因其高比容量而备受关注。然而，它们通常具有较差的动力学、严重的电压衰减和容量衰减。在此，证明了一种长期被忽视的缺锂方法可以通过简单地降低锂含量来解决这些问题。适当的锂空位可以改善动力学特征，诱导原位表面尖晶石涂层和镍掺杂。因此，精心设计的 Li1.098Mn0.533Ni0.113Co0.138O2 正极具有提高的初始库仑效率、优异的倍率性能、大幅抑制电压衰减和出色的长期循环稳定性。具体而言，它在 1 C (250 mA g-1) 下循环 500 次后显示出相对于初始放电容量 (193. 9 mAh g-1)，平均电压仍超过3.1 V。此外，10 C下的放电容量可高达132.9 mAh g-1。更重要的是，由于存在大量空位，缺锂正极也可以作为进一步提高性能的原型。
京公网安备 11010802027423号