TY  - JOUR
A1  - Sun, Fu
A1  - Osenberg, Markus
A1  - Dong, Kang
A1  - Zhou, Dong
A1  - Hilger, Andre
A1  - Jafta, Charl J.
A1  - Risse, Sebastian
A1  - Lu, Yan
A1  - Markoetter, Henning
A1  - Manke, Ingo
T1  - Correlating Morphological Evolution of Li Electrodes with Degrading Electrochemical Performance of Li/LiCoO2 and Li/S Battery Systems
BT  - Investigated by Synchrotron X-ray Phase Contrast Tomography
JF  - ACS energy letters / American Chemical Society
N2  - Efficient Li utilization is generally considered to be a prerequisite for developing next-generation energy storage systems (ESSs). However, uncontrolled growth of Li microstructures (LmSs) during electrochemical cycling has prevented its practical commercialization. Herein, we attempt to understand the correlation of morphological evolution of Li electrodes with degrading electrochemical performances of Li/LiCoO2 and Li/S systems by synchrotron X-ray phase contrast tomography technique. It was found that the continuous transformation of the initial dense Li bulk to a porous lithium interface (PL1) structure intimately correlates with the gradually degrading overall cell performance of these two systems. Additionally, the formation mechanism of the PLI and its correlation with previously reported inwardly growing LmS and the lithium-reacted region have been intensively discussed. The information that we gain herein is complementary to previous investigations and may provide general insights into understanding of degradation mechanisms of Li metal anodes and also provide highly needed guidelines for effective design of reliable next-generation Li metal-based ESSs.
Y1  - 2018
U6  - https://doi.org/10.1021/acsenergylett.7b01254
SN  - 2380-8195
VL  - 3
IS  - 2
SP  - 356
EP  - 365
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Mei, Shilin
A1  - Jafta, Charl J.
A1  - Lauermann, Iver
A1  - Ran, Qidi
A1  - Kaergell, Martin
A1  - Ballauff, Matthias
A1  - Lu, Yan
T1  - Porous Ti4O7 Particles with Interconnected-Pore Structure as a High-Efficiency Polysulfide Mediator for Lithium-Sulfur Batteries
JF  - Advanced functional materials
N2  - Multifunctional Ti4O7 particles with interconnected-pore structure are designed and synthesized using porous poly(styrene-b-2-vinylpyridine) particles as a template. The particles can work efficiently as a sulfur-host material for lithium-sulfur batteries. Specifically, the well-defined porous Ti4O7 particles exhibit interconnected pores in the interior and have a high-surface area of 592 m(2) g(-1); this shows the advantage of mesopores for encapsulating of sulfur and provides a polar surface for chemical binding with polysulfides to suppress their dissolution. Moreover, in order to improve the conductivity of the electrode, a thin layer of carbon is coated on the Ti4O7 surface without destroying its porous structure. The porous Ti4O7 and carbon-coated Ti4O7 particles show significantly improved electrochemical performances as cathode materials for Li-S batteries as compared with those of TiO2 particles.
KW  - lithium-sulfur batteries
KW  - porous particles
KW  - poly(styrene-b-2-vinylpyridine) (PS-P2VP)
KW  - Ti4O7
Y1  - 2017
U6  - https://doi.org/10.1002/adfm.201701176
SN  - 1616-301X
SN  - 1616-3028
VL  - 27
PB  - Wiley-VCH
CY  - Weinheim
ER  -