scholarly journals Pore Microstructure Impacts on Lithium Ion Transport and Rate Capability of Thick Sintered Electrodes

2021 ◽  
Author(s):  
Ziyang Nie ◽  
Rohan Parai ◽  
Chen Cai ◽  
Charles Michaelis ◽  
Jacob Michael LaManna ◽  
...  
Keyword(s):  
Ion Transport ◽  
Rate Capability ◽  
Lithium Ion ◽  
Pore Microstructure

Rational design of oxide/carbon composites to achieve superior rate-capability via enhanced lithium-ion transport across carbon to oxide

2018 ◽  
Vol 6 (14) ◽  
pp. 6033-6044 ◽  
Author(s):  
Jun Hui Jeong ◽  
Myeong-Seong Kim ◽  
Yeon Jun Choi ◽  
Geon-Woo Lee ◽  
Byung Hoon Park ◽  
...  
Keyword(s):  
Ion Transport ◽  
Carbon Coating ◽  
Rational Design ◽  
Coating Layer ◽  
Rate Capability ◽  
Lithium Ion ◽  
Carbon Composites ◽  
Carbon Coated

The superior rate-capability of nano-perforated graphene wrapped Li4Ti5O12 composite indicate that lithium-ion transport across the carbon coating layer is critical to the rate capability of carbon-coated oxides.

scholarly journals Experimental and Modeling Analysis of Holey Graphene Electrodes for High-Power-Density Li-Ion Batteries

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1063
Author(s):  
Yu-Ren Huang ◽  
Cheng-Lung Chen ◽  
Nen-Wen Pu ◽  
Chia-Hung Wu ◽  
Yih-Ming Liu ◽  
...  
Keyword(s):  
Ion Transport ◽  
Ethylene Carbonate ◽  
Solid Electrolyte Interphase ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Md Simulations ◽  
Sei Layer ◽  
Uniform Dispersion ◽  
Li Ion

The performances of lithium-ion batteries (LIBs) using holey graphene (HGNS) as the anode material are compared with those using non-holey graphene (GNS). The effects of graphene holes on ion transport are analyzed with a combined experiment/modeling approach involving molecular dynamics (MD) simulations. The large aspect ratio of GNS leads to long transport paths for Li ions, and hence a poor rate capability. We demonstrate by both experiments and simulations that the holey structure can effectively improve the rate capability of LIBs by providing shortcuts for Li ion diffusion through the holes in fast charge/discharge processes. The HGNS anode exhibits a high specific capacity of 745 mAh/g at 0.1 A/g (after 80 cycles) and 141 mAh/g at a large current density of 10 A/g, which are higher than the capacity values of the GNS counterpart by 75% and 130%, respectively. MD simulations also reveal the difference in lithium ion transport between GNS and HGNS anodes. The calculations indicate that the HGNS system has a higher diffusion coefficient for lithium ions than the GNS system. In addition, it shows that the holey structure can improve the uniformity and quality of the solid electrolyte interphase (SEI) layer, which is important for Li ion conduction across this layer to access the electrode surface. Moreover, quantum chemistry (QC) computations show that ethylene carbonate (EC), a cyclic carbonate electrolyte with five-membered-ring molecules, has the lowest electron binding energy of 1.32 eV and is the most favorable for lithium-ion transport through the SEI layer. A holey structure facilitates uniform dispersion of EC on graphene sheets and thus enhances the Li ion transport kinetics.

Engineering edge-exposed MoS2 nanoflakes anchored on the 3D cross-linked carbon frameworks for enhanced lithium storage

2020 ◽  
Vol 13 (08) ◽  
pp. 2051050
Author(s):  
Peng Huang ◽  
Yang Wu ◽  
Xinxin Wang ◽  
Peng Chen ◽  
Shuigen Li ◽  
...  
Keyword(s):  
Ion Transport ◽  
High Power ◽  
High Efficiency ◽  
Mechanical Stability ◽  
Rate Capability ◽  
Lithium Ion ◽  
Transport Network ◽  
High Rate ◽  
Lithium Storage ◽  
Transport Pathway

High-rate capability and long cycle life are currently the two most major challenges for high-power rechargeable batteries such as lithium-ion batteries (LIBs), sodium-ion batteries (SIBs). Developing electroactive materials with high-efficiency electron/ion transport network and robust mechanical stability is a key. Herein, we have successfully designed and fabricated 3D cross-linked nitrogen-doped carbon nanosheet frameworks with good interconnection and hierarchical nanostructures, and simultaneously decorated edge-enriched molybdenum disulfide (MoS[Formula: see text] nanoflakes inside the whole carbon scaffold via a salt template assisted confinement pyrolysis strategy, yielding the unique 3D carbon scaffold/MoS2 hybrids. In such a design, such hybrids not only facilitate lithium diffusion kinetics and efficient utilization of MoS2nanoflakes owing to much exposed edges and well interconnection between active components and carbon frameworks, but also provide highly efficient electron/ion transport pathway. When evaluated as anode for lithium storage, the obtained products show superior rate capability of 284 mAh g[Formula: see text] up to 5 A g[Formula: see text] and long-term cycling stability. This work demonstrates an efficient solution to design and construct a high-efficiency electron/ion transport network for high-power applications for energy storage devices.

A SnO2@carbon nanocluster anode material with superior cyclability and rate capability for lithium-ion batteries

Nanoscale ◽  
2013 ◽  
Vol 5 (8) ◽  
pp. 3298 ◽  
Author(s):  
Min He ◽  
Lixia Yuan ◽  
Xianluo Hu ◽  
Wuxing Zhang ◽  
Jie Shu ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Rate Capability ◽  
Lithium Ion

scholarly journals Achieving High-Performance Spherical Natural Graphite Anode through a Modified Carbon Coating for Lithium-Ion Batteries

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1946 ◽  
Author(s):  
Hae-Jun Kwon ◽  
Sang-Wook Woo ◽  
Yong-Ju Lee ◽  
Je-Young Kim ◽  
Sung-Man Lee
Keyword(s):  
High Performance ◽  
Carbon Coating ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Lithium Ion ◽  
Rate Performance ◽  
Natural Graphite ◽  
Artificial Graphite ◽  
Ag Electrodes ◽  
Natural Graphite Anode

The electrochemical performance of modified natural graphite (MNG) and artificial graphite (AG) was investigated as a function of electrode density ranging from 1.55 to 1.7 g∙cm−3. The best performance was obtained at 1.55 g∙cm−3 and 1.60 g∙cm−3 for the AG and MNG electrodes, respectively. Both AG, at a density of 1.55 g∙cm−3, and MNG, at a density of 1.60 g∙cm−3, showed quite similar performance with regard to cycling stability and coulombic efficiency during cycling at 30 and 45 °C, while the MNG electrodes at a density of 1.60 g∙cm−3 and 1.7 g∙cm−3 showed better rate performance than the AG electrodes at a density of 1.55 g∙cm−3. The superior rate capability of MNG electrodes can be explained by the following effects: first, their spherical morphology and higher electrode density led to enhanced electrical conductivity. Second, for the MNG sample, favorable electrode tortuosity was retained and thus Li+ transport in the electrode pore was not significantly affected, even at high electrode densities of 1.60 g∙cm−3 and 1.7 g∙cm−3. MNG electrodes also exhibited a similar electrochemical swelling behavior to the AG electrodes.

scholarly journals Nano-channel-based physical and chemical synergic regulation for dendrite-free lithium plating

Nano Research ◽  
2021 ◽  
Author(s):  
Qiang Guo ◽  
Wei Deng ◽  
Shengjie Xia ◽  
Zibo Zhang ◽  
Fei Zhao ◽  
...  
Keyword(s):  
Carbon Materials ◽  
Coating Layer ◽  
Effective Interaction ◽  
Debye Length ◽  
Rate Capability ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Positive Electrode ◽  
Lithium Metal ◽  
Interaction Distance

AbstractUncontrollable dendrite growth resulting from the non-uniform lithium ion (Li+) flux and volume expansion in lithium metal (Li) negative electrode leads to rapid performance degradation and serious safety problems of lithium metal batteries. Although N-containing functional groups in carbon materials are reported to be effective to homogenize the Li+ flux, the effective interaction distance between lithium ions and N-containing groups should be relatively small (down to nanometer scale) according to the Debye length law. Thus, it is necessary to carefully design the microstructure of N-containing carbon materials to make the most of their roles in regulating the Li+ flux. In this work, porous carbon nitride microspheres (PCNMs) with abundant nanopores have been synthesized and utilized to fabricate a uniform lithiophilic coating layer having hybrid pores of both the nano- and micrometer scales on the Cu/Li foil. Physically, the three-dimensional (3D) porous framework is favorable for absorbing volume changes and guiding Li growth. Chemically, this coating layer can render a suitable interaction distance to effectively homogenize the Li+ flux and contribute to establishing a robust and stable solid electrolyte interphase (SEI) layer with Li-F, Li-N, and Li-O-rich contents based on the Debye length law. Such a physical-chemical synergic regulation strategy using PCNMs can lead to dendrite-free Li plating, resulting in a low nucleation overpotential and stable Li plating/stripping cycling performance in both the Li‖Cu and the Li‖Li symmetric cells. Meanwhile, a full cell using the PCNM coated Li foil negative electrode and a LiFePO4 positive electrode has delivered a high capacity retention of ∼ 80% after more than 200 cycles at 1 C and achieved a remarkable rate capability. The pouch cell fabricated by pairing the PCNM coated Li foil negative electrode with a NCM 811 positive electrode has retained ∼ 73% of the initial capacity after 150 cycles at 0.2 C.

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