期刊
APPLIED SURFACE SCIENCE
卷 539, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148034
关键词
Solvo/hydrothermal synthesis; LiNi0.8Co0.1Mn0.1O2 cathode material; Ethylene glycol (EG) and polyvinylpyrrolidone (PVP); Lithium-ion batteries
类别
资金
- National Natural Science Foundation of China [51202179, 51702256]
- National Natural Science Foundation of Shaanxi Province [2013KJXX-57, 2018GY-166, 2019TD-019, 2019TSLGY07-04]
- Natural Science Foundation of Shaanxi Provincial Department of Education [201805033YD11CG17 (7)]
- Science Foundation of Shaanxi Provincial Department of Education [12JS060, 18JS058]
- Xi'an Key Laboratory of Clean Energy [2019219914SYS014CG036]
The Ni2+/Li+ disorder is a key issue in the application of LiNi0.8Co0.1Mn0.1O2 cathode material. In this study, a novel hollow porous LiNi0.8Co0.1Mn0.1O2 material was synthesized using ammonium bicarbonate-assisted solvo/hydrothermal method with ethylene glycol (EG) and surfactant polyvinylpyrrolidone (PVP). The material showed a unique spherical-like hollow structure, expanded electrochemical active region, and inhibited Ni2+/Li+ disorder.
The Ni2+/Li+ disorder has become one of the core problems limiting the application of LiNi0.8Co0.1Mn0.1O2 cathode material. Herein, an ammonium bicarbonate (NH4HCO3)-assisted solvo/hydrothermal method has been effectively applied to synthesize a novel hollow porous LiNi0.8Co0.1Mn0.1O2 material through adding ethylene glycol (EG) and surfactant polyvinylpyrrolidone (PVP) for the first time in this paper. The obtained cathode materials were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The as-prepared material with unique spherical-like hollow structure is self assembled from nanoblock primary particles into secondary micro-architectures. The results indicate that the addition of EG and PVP not only expands the electrochemical active region of LiNi0.8Co0.1Mn0.1O2 material, but also inhibits the Ni2+/Li+ disorder and the pulverization of the as-prepared sample. The practical application indicates that the material after adding EG and PVP delivers the highest discharge capacity of 220.18 mAh g(-1) for the initial circle, and the capacity retention rate of the spherical-like cathode material is 82.36% at 20 mA g(-1) after 100 cycles. In particular, this unique micro/nano-layered architecture effectively withstands high-rate charging and discharging process and maintains the integrity of the original structure after fast Li+ extraction and diffusion.
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