In-situ probing phase evolution and electrochemical mechanism of ZnMn2O4 nanoparticles anchored on porous carbon polyhedrons in high-performance aqueous Zn-ion batteries

2020 ◽  
Vol 452 ◽  
pp. 227826 ◽  
Author(s):  
Cheng Yang ◽  
Meina Han ◽  
Huihui Yan ◽  
Feng Li ◽  
Minjie Shi ◽  
...  
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Phase Evolution ◽  
Electrochemical Mechanism

In Situ One-Step Synthesis of Hierarchical Nitrogen-Doped Porous Carbon for High-Performance Supercapacitors

2014 ◽  
Vol 6 (10) ◽  
pp. 7214-7222 ◽  
Author(s):  
Ju-Won Jeon ◽  
Ronish Sharma ◽  
Praveen Meduri ◽  
Bruce W. Arey ◽  
Herbert T. Schaef ◽  
...  
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Nitrogen Doped ◽  
One Step

scholarly journals Mechanism of Li2S formation and dissolution in Lithium-Sulphur batteries

2021 ◽  
Author(s):  
Christian Prehal ◽  
Sara Drvarič Talian ◽  
Alen Vizintin ◽  
Heinz Amenitsch ◽  
Robert Dominko ◽  
...  
Keyword(s):  
High Performance ◽  
Surface Film ◽  
Rate Capability ◽  
Stochastic Modelling ◽  
Phase Evolution ◽  
Saxs Data ◽  
X Ray ◽  
X Ray Scattering ◽  
Chemical Phase

Abstract Insufficient understanding of the mechanism that reversibly converts sulphur into lithium sulphide (Li2S) via soluble polysulphides (PS) hampers the realization of high performance lithium-sulphur cells. Typically Li2S formation is explained by direct electroreduction of a PS to Li2S; however, this is not consistent with the size of the insulating Li2S deposits. Here, we use in situ small and wide angle X-ray scattering (SAXS/WAXS) to track the growth and dissolution of crystalline and amorphous deposits from atomic to sub-micron scales during charge and discharge. Stochastic modelling based on the SAXS data allows quantification of the chemical phase evolution during discharge and charge. We show that Li2S deposits predominantly via disproportionation of transient, solid Li2S2 to form primary Li2S crystallites and solid Li2S4 particles. We further demonstrate that this process happens in reverse during charge. These findings show that the discharge capacity and rate capability in Li-S battery cathodes are therefore limited by mass transport through the increasingly tortuous network of Li2S / Li2S4 / carbon pores rather than electron transport through a passivating surface film.

Template-assisted in situ confinement synthesis of nitrogen and oxygen co-doped 3D porous carbon network for high-performance sodium-ion battery anode

2018 ◽  
Vol 42 (17) ◽  
pp. 14410-14416 ◽  
Author(s):  
Dan Wang ◽  
Zhiyuan Wang ◽  
Yuan Li ◽  
Shaohua Luo ◽  
Kangze Dong ◽  
...  
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Sodium Ion ◽  
Sodium Ion Battery ◽  
Carbon Network ◽  
Co Doped ◽  
Battery Anode

Nitrogen and oxygen co-doped porous carbon network is synthesized by NaCl template-assisted in situ confinement method and used for a high-performance sodium-ion battery anode.

Chemical tailoring of one-dimensional polypyrene nanocapsules at a molecular level: towards ideal sulfur hosts for high-performance Li–S batteries

2019 ◽  
Vol 7 (5) ◽  
pp. 2009-2014 ◽  
Author(s):  
Zhichang Xiao ◽  
Xiaohui Xu ◽  
Debin Kong ◽  
Jiaxu Liang ◽  
Shanke Zhou ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Porous Carbon ◽  
High Performance ◽  
Molecular Level ◽  
Capsule Wall ◽  
One Dimensional ◽  
Sulfur Hosts

A novel 1D porous carbon nanocapsule (PCNC) has been successfully fabricated by heat treatment of the in situ synthesized polypyrene nanocapsule, where the diameter of the capsule wall can be easily tuned.

Sign in / Sign up

Export Citation Format

Share Document