journal article·2020-10-26

Tailoring Submicron Cobblestone-Like Carbon-Free CoSe2 with High Energy Density for Sodium-Ion Batteries

Tiezhong Liu, Shuang Hou, Youpeng Li, Yayun Guo, Chenghao Yang, Lingzhi Zhao

ACS Applied Energy Materials· Volume 3· Issue 10
Publisher page

Abstract

CoSe2 with high theoretical capacity has drawn massive attention as an ideal anode material for sodium-ion batteries (SIBs). However, developing a CoSe2 anode with high energy density to satisfy the practical application remains a very intractable challenge. Here, a carbon-free and compact submicron cobblestone-like CoSe2 anode material was designed and synthesized, which can promote tap density via eliminating the introduction of carbon species, nanostructure, and hollow construction. Benefiting from the contribution of partial pseudocapacitive contributes, CoSe2 displays high reversible capacity, outstanding rate property, and durable cycling stability (414.6 mAh g–1 after 700 loops at 0.2 A g–1 and 416.5 mAh g–1 after 1350 loops even at 2 A g–1). The enhanced tap density and remarkable sodium storage capability greatly improved volumetric energy density and gravimetric energy density and, subsequently, energy density. Meanwhile, ex situ XRD and Raman measurements were utilized to further understand the sodium storage mechanism of as-prepared CoSe2. This work opens up a new opportunity regarding the practical application of the CoSe2 anode with high energy density in SIBs.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Supercapacitor Materials and Fabrication

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Guangdong Provincial Engineering Technology Research Center for Low Carbon and Advanced Energy Materials, Institute of Semiconductor Science and Technology, South China Normal University, Guangzhou 510631, P. R. China

Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China

Institute of Science and Technology Innovation, South China Normal University, Qingyuan 511517, P. R. China

SCNU Qingyuan Institute of Science and Technology Innovation Co., Ltd., Qingyuan 511517, P. R. China

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · Sino-Singapore International Joint Research Institute · Science and Technological plan of Guangdong Province, Guangzhou and Qingyuan City

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