Journal
CHEMICAL ENGINEERING JOURNAL
Volume 418, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129227
Keywords
Pomegranate-inspired nanospheres; Anode materials; Pseudocapacitive effect; Lithium-ion batteries
Categories
Funding
- National Natural Science Foundation of China [51702095]
- Natural Science Foundation of Hunan Province, China [2018JJ3041]
- Fundamental Research Funds for the Central Universities [531118010016]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515110999]
- High-Level Talent's Research Funding of Foshan University [Gg07295]
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A novel strategy was developed to prepare pomegranate-inspired nanospheres in which ultrafine Zn2Ti3O8/TiO2 nanoparticles are embedded in a hierarchical carbon framework (Zn2Ti3O8/TiO2@C). This structure effectively reduces Li+ diffusion distance, relieves volume expansion, and induces additional pseudocapacitive effect, leading to a high capacity and remarkable cycling life of the Zn2Ti3O8/TiO2@C electrode. This work provides beneficial enlightenment for novel material structure design and accelerates the application of Zn2Ti3O8 in lithium-ion batteries.
As a new-type anode material for lithium-ion batteries, Zn2Ti3O8 has attracted enormous attention because of the low cost, excellent safety, and high theoretical capacity of 466 mAh g-1. However, the practical capacity and cycling stability are always suppressed by poor intrinsic conductivity, sluggish reaction kinetics, and serious volume change during electrochemical reaction. To tackle the aforementioned issues, a facile and scalable strategy is developed to prepare pomegranate-inspired nanospheres, in which ultrafine Zn2Ti3O8/TiO2 nanoparticles are embedded in a hierarchical carbon framework (Zn2Ti3O8/TiO2@C). The nanoscale spherical structure constructed by ultrafine nanoparticles enables to reduce Li+ diffusion distance, relieve volume expansion, and induce additional pseudocapacitive effect. The favorable dispersion of ultrafine Zn2Ti3O8/TiO2 nanoparticles in the conductive carbon framework prevents the agglomeration of the active nanoparticles, guaranteeing a rapid electron transfer path. Benefiting from these unique structural properties, the as-prepared Zn2Ti3O8/TiO2@C electrode exhibits a high capacity of 380 mAh g-1 at 100 mA g-1 and remarkable cycling life up to 1800 cycles even at 1000 mA g-1. Therefore, this work will provide beneficial enlightenment for novel material structure design and accelerate the application of Zn2Ti3O8 in lithium-ion batteries.
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