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 Silica template-assisted synthesis of SnO2@porous carbon composites as anode materials with excellent rate capability and cycling stability for lithium-ion batteries

RSC Advances ◽  
2017 ◽  
Vol 7 (48) ◽  
pp. 30070-30079 ◽  
Author(s):  
Jian Guo ◽  
Ping Li ◽  
Liying Chai ◽  
Yi Su ◽  
Jinxiang Diao ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Anode Materials ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Carbon Composites ◽  
High Specific Capacity ◽  
Carbon Coated ◽  
Silica Template ◽  
Template Assisted Synthesis

A kind of porous carbon coated SnO2-based composites was successfully produced under direction of a silica template. The prepared SnO2@PC anodes deliver high specific capacity, excellent cycling durability and remarkable rate capability in LIBs.

scholarly journals Structural and Electrochemical Characterization of PureLiFePO4and Nanocomposite C-LiFePO4Cathodes for Lithium Ion Rechargeable Batteries

2009 ◽  
Vol 2009 ◽  
pp. 1-10 ◽  
Author(s):  
Arun Kumar ◽  
R. Thomas ◽  
N. K. Karan ◽  
J. J. Saavedra-Arias ◽  
M. K. Singh ◽  
...  
Keyword(s):  
Carbon Coating ◽  
Lithium Iron Phosphate ◽  
Rate Capability ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Rechargeable Batteries ◽  
Ex Situ ◽  
Cyclic Voltammograms ◽  
Carbon Coated ◽  
Olivine Structure

Pure lithium iron phosphate (LiFePO4) and carbon-coatedLiFePO4(C-LiFePO4) cathode materials were synthesized for Li-ion batteries. Structural and electrochemical properties of these materials were compared. X-ray diffraction revealed orthorhombic olivine structure. Micro-Raman scattering analysis indicates amorphous carbon, and TEM micrographs show carbon coating onLiFePO4particles. Ex situ Raman spectrum of C-LiFePO4at various stages of charging and discharging showed reversibility upon electrochemical cycling. The cyclic voltammograms ofLiFePO4and C-LiFePO4showed only a pair of peaks corresponding to the anodic and cathodic reactions. The first discharge capacities were 63, 43, and 13 mAh/g for C/5, C/3, and C/2, respectively forLiFePO4where as in case of C-LiFePO4that were 163, 144, 118, and 70 mAh/g for C/5, C/3, C/2, and 1C, respectively. The capacity retention of pureLiFePO4was 69% after 25 cycles where as that of C-LiFePO4was around 97% after 50 cycles. These results indicate that the capacity and the rate capability improved significantly upon carbon coating.

Improved electrochemical performance of the Na3V2(PO4)3 cathode by B-doping of the carbon coating layer for sodium-ion batteries

2015 ◽  
Vol 3 (29) ◽  
pp. 15190-15201 ◽  
Author(s):  
Wei Shen ◽  
Hui Li ◽  
Cong Wang ◽  
Zhihong Li ◽  
Qunjie Xu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Carbon Coating ◽  
Coating Layer ◽  
Lithium Ion ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Boron Doped ◽  
Carbon Coated ◽  
B Doping

Boron-doped carbon coated Na3V2(PO4)3 is prepared, and different impacts of various carbon–boron species on the improvement of the electrochemical performance for sodium and lithium ion batteries are analyzed and discussed in this work.

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.

Carbon-coated porous silicon composites as high performance Li-ion battery anode materials: can the production process be cheaper and greener?

2016 ◽  
Vol 4 (2) ◽  
pp. 552-560 ◽  
Author(s):  
Wenfeng Ren ◽  
Yanhong Wang ◽  
Zailei Zhang ◽  
Qiangqiang Tan ◽  
Ziyi Zhong ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Anode Materials ◽  
High Performance ◽  
Lithium Ion ◽  
Solvothermal Reaction ◽  
Carbon Composites ◽  
Silicon Carbon ◽  
Excellent Electrochemical Performance ◽  
Carbon Coated ◽  
Li Ion

Porous silicon/carbon composites prepared by the solvothermal reaction show excellent electrochemical performance as anode materials for lithium ion batteries.

HIGH POWER PERFORMANCE OF MULTICOMPONENT OLIVINE CATHODE MATERIAL FOR LITHIUM-ION BATTERIES

2011 ◽  
Vol 04 (03) ◽  
pp. 299-303 ◽  
Author(s):  
ZHUO TAN ◽  
PING GAO ◽  
FUQUAN CHENG ◽  
HONGJUN LUO ◽  
JITAO CHEN ◽  
...  
Keyword(s):  
Transition Metal ◽  
Cathode Material ◽  
High Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Coprecipitation Method ◽  
Homogeneous Distribution ◽  
Power Performance ◽  
X Ray ◽  
Carbon Coated

A multicomponent olivine cathode material, LiMn0.4Fe0.6PO4 , was synthesized via a novel coprecipitation method of the mixed transition metal oxalate. X-ray diffraction patterns indicate that carbon-coated LiMn0.4Fe0.6PO4 has been prepared successfully and that LiMn0.4Fe0.6PO4/C is crystallized in an orthorhombic structure without noticeable impurity. Homogeneous distribution of Mn and Fe in LiMn0.4Fe0.6PO4/C can be observed from the scanning electron microscopy (SEM) and the corresponding energy dispersive X-ray spectrometry (EDS) analysis. Hence, the electrochemical activity of each transition metal in the olivine synthesized via coprecipitation method was enhanced remarkably, as indicated by the galvanostatic charge/discharge measurement. The synthesized LiMn0.4Fe0.6PO4/C exhibits a high capacity of 158.6 ± 3 mAhg-1 at 0.1 C, delivering an excellent rate capability of 122.6 ± 3 mAhg-1 at 10 C and 114.9 ± 3 mAhg-1 at 20 C.

Graphene-templated formation of 3D tin-based foams for lithium ion storage applications with a long lifespan

2016 ◽  
Vol 4 (2) ◽  
pp. 362-367 ◽  
Author(s):  
Bin Luo ◽  
Tengfei Qiu ◽  
Long Hao ◽  
Bin Wang ◽  
Meihua Jin ◽  
...  
Keyword(s):  
Carbon Coating ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycling Stability ◽  
3D Graphene ◽  
Pore Structures ◽  
Ion Storage ◽  
Superior Cycling Stability

3D graphene-templated tin-based foams with tunable pore structures and uniform carbon coating have been successfully developed, achieving superior cycling stability and rate capability for lithium ion storage.

Electrochemical Properties of Carbon-Coated NbO2 as a Negative Electrode for Lithium-Ion Batteries

2016 ◽  
Vol 724 ◽  
pp. 87-91 ◽  
Author(s):  
Chang Su Kim ◽  
Yong Hoon Cho ◽  
Kyoung Soo Park ◽  
Soon Ki Jeong ◽  
Yang Soo Kim
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Ball Milling ◽  
Carbon Coating ◽  
Electrochemical Impedance ◽  
Active Material ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Transfer Resistance ◽  
Carbon Coated

We investigated the electrochemical properties of carbon-coated niobium dioxide (NbO2) as a negative electrode material for lithium-ion batteries. Carbon-coated NbO2 powders were synthesized by ball-milling using carbon nanotubes as the carbon source. The carbon-coated NbO2 samples were of smaller particle size compared to the pristine NbO2 samples. The carbon layers were coated non-uniformly on the NbO2 surface. The X-ray diffraction patterns confirmed that the inter-layer distances increased after carbon coating by ball-milling. This lead to decreased charge-transfer resistance, confirmed by electrochemical impedance spectroscopy, allowing electrons and lithium-ions to quickly transfer between the active material and electrolyte. Electrochemical performance, including capacity and initial coulombic efficiency, was therefore improved by carbon coating by ball-milling.

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