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Boron Nitride Nanotube-Based Separator for High-Performance Lithium-Sulfur Batteries

Authors :
Hong-Sik Kim
Hui-Ju Kang
Hongjin Lim
Hyun Jin Hwang
Jae-Woo Park
Tae-Gyu Lee
Sung Yong Cho
Se Gyu Jang
Young-Si Jun
Source :
Nanomaterials, Vol 12, Iss 1, p 11 (2021)
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

To prevent global warming, ESS development is in progress along with the development of electric vehicles and renewable energy. However, the state-of-the-art technology, i.e., lithium-ion batteries, has reached its limitation, and thus the need for high-performance batteries with improved energy and power density is increasing. Lithium-sulfur batteries (LSBs) are attracting enormous attention because of their high theoretical energy density. However, there are technical barriers to its commercialization such as the formation of dendrites on the anode and the shuttle effect of the cathode. To resolve these issues, a boron nitride nanotube (BNNT)-based separator is developed. The BNNT is physically purified so that the purified BNNT (p−BNNT) has a homogeneous pore structure because of random stacking and partial charge on the surface due to the difference of electronegativity between B and N. Compared to the conventional polypropylene (PP) separator, the p−BNNT loaded PP separator prevents the dendrite formation on the Li metal anode, facilitates the ion transfer through the separator, and alleviates the shuttle effect at the cathode. With these effects, the p−BNNT loaded PP separators enable the LSB cells to achieve a specific capacity of 1429 mAh/g, and long-term stability over 200 cycles.

Details

Language :
English
ISSN :
20794991
Volume :
12
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Nanomaterials
Publication Type :
Academic Journal
Accession number :
edsdoj.9d36182ac545b792eeb8ba2f02ae82
Document Type :
article
Full Text :
https://doi.org/10.3390/nano12010011