期刊
JOURNAL OF POWER SOURCES
卷 432, 期 -, 页码 8-15出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.05.069
关键词
Lithium-rich layered oxides; Oxygen vacancy; Cathode; Lithium-ion battery
资金
- National Key Research and Development Program of China [2016YFA0202603]
- National Natural Science Foundation of China [51672204]
Lithium-rich layered oxides are promising cathode materials for lithium-ion batteries due to their high reversible capacities (more than 250 mAh g(-1)). Nevertheless, in operation, the oxygen lattice would be transformed into O-2 gas with phase transformation. Thus, to suppress O-2 gas, it is necessary to pre-generate the oxygen vacancies in the surface of materials. Herein, for facile and scalable pre-generation of oxygen vacancies, pristine Li2MnO3 center dot LiNi1/3Co1/3Mn1/3O2 oxide (PLR-NCM) is treated directly by CO2 gas just at the room temperature. The modified material (MLR-NCM), with rich oxygen vacancies in the surface and no obvious structural change inside, shows a discharge capacity of 321 mAh g(-1) based on half-cells at 55 degrees C and 0.1 C (1.0 C = 250 mA g(-1)), and 240 mAh g(-1) as full cells at the room temperature. In addition, it also exhibits high cycling and rate performance owing to the significantly improved lithium ion and electron diffusion efficiencies. Importantly, by real-time monitoring of structural evolution using in situ XRD technique, we find that the O2 gas release of the modified material is successfully suppressed. This facile method proposed in our work provides a new strategy for greatly improving the performance of lithium-ion batteries.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据