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Carbon Nanotubes Coupled with Metal Ion Diffusion Layers Stabilize Oxide Conversion Reactions in High-Voltage Lithium-Ion Batteries
journal contribution
posted on 2020-03-24, 12:36 authored by Qian Li, Yingqiang Wu, Zhaomin Wang, Hai Ming, Wenxi Wang, Dongming Yin, Limin Wang, Husam N. Alshareef, Jun MingCreating new architectures combined
with super diverse materials for achieving more excellent performances
has attracted great attention recently. Herein, we introduce a novel
dual metal (oxide) microsphere reinforced by vertically aligned carbon
nanotubes (CNTs) and covered with a titanium oxide metal ion-transfer
diffusion layer. The CNTs penetrate the oxide particles and buffer
structural volume change while enhancing electrical conductivity.
Meanwhile, the external TiO2–C shell serves as a
transport pathway for mobile metal ions (e.g., Li+) and
acts as a protective layer for the inner oxides by reducing the electrolyte/metal
oxide interfacial area and minimizing side reactions. The proposed
design is shown to significantly improve the stability and Coulombic
efficiency (CE) of metal (oxide) anodes. For example, the as-prepared
MnO–CNTs@TiO2–C microsphere demonstrates
an extremely high capacity of 967 mA h g–1 after
200 cycles, where a CE as high as 99% is maintained. Even at a harsh
rate of 5 A g–1 (ca. 5 C), a capacity of 389 mA
h g–1 can be maintained for thousands of cycles.
The proposed oxide anode design was combined with a nickel-rich cathode
to make a full-cell battery that works at high voltage and exhibits
impressive stability and life span.
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oxide anode designfull-cell batterymetal ionstransport pathwayvolume changeoxide particlesMetal Ion Diffusion Layers Stabilize Oxide Conversion ReactionsHigh-Voltage Lithium-Ion BatteriesCoulombic efficiencyside reactionscarbon nanotubesCEnickel-rich cathode200 cyclestitanium oxide metal ion-transfer diffusion layerCNTlife spancarbon Nanotubes
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