scholarly journals Cracks Formation in Lithium-Rich Cathode Materials for Lithium-Ion Batteries during the Electrochemical Process

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2712 ◽  
Author(s):  
Tao Cheng ◽  
Zhongtao Ma ◽  
Run Gu ◽  
Riming Chen ◽  
Yingchun Lyu ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Cathode Materials ◽  
Particle Surface ◽  
Lithium Ion ◽  
Electrochemical Process ◽  
Molten Salt Method ◽  
Transmission Electron ◽  
Future Work ◽  
Capacity Decay

The lithium-rich Li[Li0.2Ni0.13Mn0.54Co0.13]O2 nanoplates were synthesized using a molten-salt method. The nanoplates showed an initial reversible discharge capacity of 233 mA·h·g−1, with a fast capacity decay. The morphology and micro-structural change, after different cycles, were studied by a scanning electron microscope (SEM) and transmission electron microscopy (TEM) to understand the mechanism of the capacity decay. Our results showed that the cracks generated from both the particle surface and the inner, and increased with long-term cycling at 0.1 C rate (C = 250 mA·g−1), together with the layered to spinel and rock-salt phase transitions. These results show that the cracks and phase transitions could be responsible for the capacity decay. The results will help us to understand capacity decay mechanisms, and to guide our future work to improve the electrochemical performance of lithium-rich cathode materials.

Excellent long-term electrochemical performance of graphite oxide as cathode materials for lithium-ion batteries

Ionics ◽  
2017 ◽  
Vol 23 (11) ◽  
pp. 3023-3029 ◽  
Author(s):  
Chunmiao Yan ◽  
Zhen Zhang ◽  
Zongze Liu ◽  
Yameng Liu ◽  
Songping Wu
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Graphite Oxide ◽  
Cathode Materials ◽  
Lithium Ion

A novel nanoporous Fe-doped lithium manganese phosphate material with superior long-term cycling stability for lithium-ion batteries

Nanoscale ◽  
2015 ◽  
Vol 7 (27) ◽  
pp. 11509-11514 ◽  
Author(s):  
Pengjian Zuo ◽  
Liguang Wang ◽  
Wei Zhang ◽  
Geping Yin ◽  
Yulin Ma ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Cycling Stability ◽  
Manganese Phosphate ◽  
Phosphate Material ◽  
Lithium Manganese ◽  
Lithium Manganese Phosphate ◽  
Capacity Decay

LiMn0.8Fe0.2PO4 exhibits an ultralong cycling ability exceeding 1000 cycles with a capacity decay of 0.0068 mA h g−1 loss per cycle.

Facile Synthesis of Tremella-Like Li3V2(PO4)3/C Composite Cathode Materials Based on Oroxylum for Use in Lithium-Ion Batteries

2020 ◽  
Vol 20 (3) ◽  
pp. 1962-1967
Author(s):  
Zhen Liu ◽  
Wei Zhou ◽  
Guilin Zeng ◽  
Yuling Zhang ◽  
Zebin Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Cathode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Composite Cathode ◽  
Potential Range ◽  
X Ray Diffraction ◽  
Immersion Method ◽  
X Ray ◽  
Transmission Electron

Oroxylum as a traditional Chinese medicine, was used as a green and novel bio-template to synthesize tremella-like Li3V2(PO4)3/C composite (LVPC) cathode materials by adopting a facile immersion method. The microstructures were analyzed by X-ray diffraction analysis, scanning electron microscopy, and transmission electron microscopy. The electrochemical properties were investigated by galvanostatic charge–discharge experiments. The LVPC revealed specific capacity of 95 mAh·g-1 at 1 C rate within potential range of 3.0–4.3 V. After 100 cycles at 0.2 C, the retention of discharge capacity was 96%. The modified electrochemical performance is mainly resulted from the distinct tremella-like structure.

scholarly journals Transformation of SnS Nanocompisites to Sn and S Nanoparticles during Lithiation

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 145
Author(s):  
Haokun Deng ◽  
Thapanee Sarakonsri ◽  
Tao Huang ◽  
Aishui Yu ◽  
Katerina Aifantis
Keyword(s):  
Interface Layer ◽  
Free Standing ◽  
Artificial Graphite ◽  
Transmission Electron ◽  
Carbon Substrates ◽  
Electrochemical Cycling ◽  
Insight Into ◽  
Initial Capacity ◽  
Capacity Decay

SnS nanomaterials have a high initial capacity of 1000 mAh g−1; however, this cannot be retained throughout electrochemical cycling. The present study provides insight into this capacity decay by examining the effect that Li intercalation has on SnS “nanoflowers” attached on carbon substrates’ such as artificial graphite. Scanning and transmission electron microscopy reveal that lithiation of such materials disrupts their initial morphology and produces free-standing Sn and SnS nanoparticles that dissolve in the electrolyte and disperse uniformly over the entire electrode surface. As a result, the SnS is rendered inactive after initial cycling and contributes to the formation of the solid electrolyte interface layer, resulting in continuous capacity decay during long term cycling. This is the first study that illustrates the morphological effects that the conversion mechanism has on SnS anodes. In order to fully utilize SnS materials, it is necessary to isolate them from the electrolyte by fully encapsulating them in a matrix.

Mechanistic Study of Electrode Materials for Rechargeable Batteries beyond Lithium Ion by In-situ Transmission Electron Microscopy

2021 ◽  
Author(s):  
Shaojun Guo ◽  
yousaf Muhammad ◽  
Ufra Naseer ◽  
Yiju Li ◽  
Zeeshan Ali ◽  
...  
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Lithium Ion ◽  
Rechargeable Batteries ◽  
Electrochemical Process ◽  
Atomic Scale ◽  
Mechanistic Study ◽  
Electrochemical Reactions ◽  
Transmission Electron

Understanding the fundamental mechanisms of advanced electrode materials at the atomic scale during the electrochemical process is condemnatory to develop the high-performance rechargeable batteries. The complex electrochemical reactions involved inside...

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