Carbon Nanotube Paper as Anode for Flexible Lithium-Ion Battery

In this investigation, multiwalled carbon nanotube (MWCNT) paper consists of MWCNTs and cellulose was fabricated by traditional paper-making method. It was applied directly as negative electrode in flexible lithium ion battery to replace ordinary electrode which is combined with anode material and current collector. The electrochemical performances of the as-produced MWCNT paper (AMP) and carbonized MWCNT paper (CMP) were evaluated in this study. The morphology and structure of the MWCNT papers were observed by scanning electron microscopy (SEM). The electrochemical performance of the battery was operated by cell test and electrochemical impedance spectroscopy (EIS) measurement. The charging and discharging results indicated that the CMP behaves with higher capacity than AMP. And the EIS analysis showed that a lower charge transfer resistance can be obtained in the CMP. The excellent electrochemical performance verifies the feasibility of MWCNT papers as a promising candidate for the anode in flexible lithium ion battery.

Download Full-text

Electrochemical Decomposition of Poly(Vinylidene Fluoride) Binder for a Graphite Negative Electrode in Lithium-Ion Batteries

Materials Science Forum ◽

10.4028/www.scientific.net/msf.893.127 ◽

2017 ◽

Vol 893 ◽

pp. 127-131 ◽

Cited By ~ 1

Author(s):

Min Ji Kim ◽

Chang Hee Lee ◽

Mun Hui Jo ◽

Soon Ki Jeong

Keyword(s):

Lithium Ion Batteries ◽

Vinylidene Fluoride ◽

Electrochemical Impedance ◽

Negative Electrode ◽

Reduction Process ◽

Lithium Ion ◽

Charge Transfer Resistance ◽

Transfer Resistance ◽

Electrode Resistance ◽

Poly Vinylidene Fluoride

To clarify the electrochemical decomposition of poly (vinylidene fluoride) (PVdF) used as a binder for lithium-ion batteries while simultaneously verifying the correlation between electrode resistance and the PVdF content in graphite negative electrodes, in this study, we applied lithium bis (trifluoromethanesulfonyl) imide, which suppresses graphite exfoliation, as a salt. As a result, the electrochemical decomposition of PVdF was observed at a higher potential than that at which the electrolyte was decomposed during the reduction process. Additionally, this study demonstrated (through electrochemical impedance spectroscopy analysis) that electrode resistances such as solid electrolyte interface and charge transfer resistance proportionally increased with the PVdF content.

Download Full-text

Preparation and Electrochemical Performance of Mg2 + Doped Li4Ti5O12 Anode Materials for Lithium-Ion Batteries

Materials Science Forum ◽

10.4028/www.scientific.net/msf.960.238 ◽

2019 ◽

Vol 960 ◽

pp. 238-243

Author(s):

Ming Wang ◽

Xue Ming Zhang ◽

Ying Bo Wang ◽

Li Li Cheng ◽

Xue Lei Wang ◽

...

Keyword(s):

Electrochemical Performance ◽

Electrochemical Impedance ◽

Solid Phase ◽

Retention Rate ◽

Specific Capacity ◽

Lithium Ion ◽

Charge Transfer Resistance ◽

Solid Phase Reaction ◽

Phase Reaction ◽

Transfer Resistance

Spinel Li4Ti5O12 (LTO) doped with Mg2+ was synthesized by solid-phase reaction method. The Mg2+ doping quantity was 3%, 6%, 9%, and 12%, respectively. The structure and electrochemical performance of the prepared LTO composites were investigated by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Electrochemical Impedance Spectroscopy (EIS), and galvanostatic charge-discharge tests. It was found that the doped Mg ion did not change the structure of Li4Ti5O12, and it was evenly distributed around Li4Ti5O12. When Mg2+ doping quantity increased from 3% to 12%, the internal resistance and charge transfer resistance of the composite both decreased. The first discharge specific capacity of 6%-Mg2+ doped LTO composite was 168 mAh/g, which was close to the theoretical capacity of pure lithium titanate (175 mAh/g), and the capacity retention rate was 98% after 100 cycles.

Download Full-text

Improved Electrochemical Performance of 0.5Li2MnO3·0.5LiNi0.5Mn0.5O2 Cathode Materials for Lithium Ion Batteries Synthesized by Ionic-Liquid-Assisted Hydrothermal Method

Frontiers in Chemistry ◽

10.3389/fchem.2020.00729 ◽

2020 ◽

Vol 8 ◽

Author(s):

Yanhong Xiang ◽

Youliang Jiang ◽

Saiqiu Liu ◽

Jianhua Wu ◽

Zhixiong Liu ◽

...

Keyword(s):

Electron Microscopy ◽

Ionic Liquid ◽

Electrochemical Performance ◽

Hydrothermal Method ◽

Cathode Materials ◽

Electrochemical Impedance ◽

Rate Capability ◽

Lithium Ion ◽

Charge Transfer Resistance ◽

Transfer Resistance

Well-dispersed Li-rich Mn-based 0.5Li2MnO3·0.5LiNi0.5Mn0.5O2 nanoparticles with diameter ranging from 50 to 100 nm are synthesized by a hydrothermal method in the presence of N-hexyl pyridinium tetrafluoroborate ionic liquid ([HPy][BF4]). The microstructures and electrochemical performance of the prepared cathode materials are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electrochemical measurements. The XRD results show that the sample prepared by ionic-liquid-assisted hydrothermal method exhibits a typical Li-rich Mn-based pure phase and lower cation mixing. SEM and TEM images indicate that the extent of particle agglomeration of the ionic-liquid-assisted sample is lower compared to the traditional hydrothermal sample. Electrochemical test results indicate that the materials synthesized by ionic-liquid-assisted hydrothermal method exhibit better rate capability and cyclability. Besides, electrochemical impedance spectroscopy (EIS) results suggest that the charge transfer resistance of 0.5Li2MnO3· 0.5LiNi0.5Mn0.5O2 synthesized by ionic-liquid-assisted hydrothermal method is much lower, which enhances the reaction kinetics.

Download Full-text

Synthesis of LiMn0.7Fe0.3PO4/C Composite Cathode Materials for Lithium-Ion Batteries

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.2617 ◽

2013 ◽

Vol 634-638 ◽

pp. 2617-2620

Author(s):

Na Chi ◽

Jian Gang Li ◽

Lei Wang ◽

Jie Si Fu

Keyword(s):

Electrochemical Performance ◽

Electrochemical Impedance ◽

Lithium Ion ◽

Solid State Reaction Method ◽

Composite Cathode ◽

Charge Transfer Resistance ◽

Electrochemical Impedance Spectra ◽

Transfer Resistance ◽

Cation Order ◽

Increasing Temperature

LiMn0.7Fe0.3PO4/C composite cathode material was prepared by using a solid state reaction method. The effects of annealing temperatures on the structural and electrochemical performance of LiMn0.7Fe0.3PO4/C were investigated by using X-ray diffraction (XRD), scanning electron microscope (SEM), charge–discharge tests and electrochemical impedance spectra (EIS). The results showed that all of samples have pure ordered olivine phase with orthorhombic Pnma structure. The electrochemical performance of LiMn0.7Fe0.3PO4/C can be improved remarkably with increasing temperature from 550oC to 650 oC due to increased crystallization, cation-order and decreased charge transfer resistance. However, increase temperature to 700 oC leads to bigger crystal particle size and decreased cation-order, thus higher resistance and deteriorated electrochemical properties. The sample prepared at optimized temperature of 650 oC presents a remarkable improved electrochemical performance. It delivers an initial capacity of 125.1 mAhg-1 at 0.2C, 95 mAhg-1 at 5C, and a capacity retention of 98.0% after 30 cycles.

Download Full-text

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

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.724.87 ◽

2016 ◽

Vol 724 ◽

pp. 87-91 ◽

Cited By ~ 3

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.

Download Full-text

A C-coated and Sb-doped SnO2 nanocompsite with high surface area and low charge transfer resistance as ultrahigh capacity lithium ion battery anode

Materials Today Energy ◽

10.1016/j.mtener.2019.05.006 ◽

2019 ◽

Vol 13 ◽

pp. 93-99 ◽

Cited By ~ 2

Author(s):

Qiang Zhang ◽

Qiuming Gao ◽

Weiwei Qian ◽

Hang Zhang ◽

Weiqian Tian ◽

...

Keyword(s):

Charge Transfer ◽

Lithium Ion Battery ◽

Surface Area ◽

High Surface ◽

High Surface Area ◽

Lithium Ion ◽

Charge Transfer Resistance ◽

Transfer Resistance ◽

Low Charge ◽

Battery Anode

Download Full-text

Electrochemical Performance of Lithium-Ion Hybrid Supercapacitors based on Activated Carbon and Nanoplatelet Li4Ti5O12 Insertion Electrode Synthesized by Nanoscission Technique

MRS Proceedings ◽

10.1557/opl.2015.280 ◽

2015 ◽

Vol 1740 ◽

Author(s):

Sandeep Singh ◽

Alok C Rastogi ◽

Fredrick Omenya ◽

M Stanley Whittingham ◽

Archit Lal ◽

...

Keyword(s):

Activated Carbon ◽

Electrochemical Performance ◽

Lithium Ion ◽

Charge Transfer Resistance ◽

Electrode Polarization ◽

Hybrid Supercapacitor ◽

Transfer Resistance ◽

Hybrid Supercapacitors ◽

Current Change ◽

Kinetic Effects

ABSTRACTElectrochemical performance of hybrid supercapacitor (HSC) utilizing surface sculpted Li4Ti5O12 (LTO) insertion electrode having nanoplatelet-like morphology and activated carbon (AC) electrode is investigated for energy storage application. Cyclic voltammetry (CV) at variable scan rates 0.5 to 60 mV.s-1 in the 0-3.2 V range show pseusocapacitive behavior and fast rate of current change indicating rapid Faradaic kinetics. Nyquist impedance study show charge transfer resistance due to kinetic effects of electron transfer and Li+ de-intercalation process at the LTO anode. Low capacity (0.2 C-1C) charge-discharge (CD) curves show high Coulomb efficiency with marginal reduction at high 5-10 C rates due to irreversibility of adsorbed PF6 anions at the electrolyte-AC interface. Galvanostatic CD cycling tests over 50 cycles at different C-rates show decline in storage capacity due to electrode polarization effects. Reduction, broadening and shift of the Raman line at 678 cm-1 from Ti-O bonds in TiO6 octahedra after cycling indicates Li insertion reactions in functioning of hybrid supercapacitor. The hybrid supercapacitor cells have shown energy density, 29 Wh.kg-1 and power density, 350 W.kg-1.

Download Full-text

Improved electrochemical performance of SnO2–mesoporous carbon hybrid as a negative electrode for lithium ion battery applications

Physical Chemistry Chemical Physics ◽

10.1039/c3cp54492c ◽

2014 ◽

Vol 16 (14) ◽

pp. 6630 ◽

Cited By ~ 66

Author(s):

N. R. Srinivasan ◽

Sagar Mitra ◽

Rajdip Bandyopadhyaya

Keyword(s):

Electrochemical Performance ◽

Lithium Ion Battery ◽

Mesoporous Carbon ◽

Negative Electrode ◽

Lithium Ion

Download Full-text

Electrochemical Impedance Spectroscopy on the Performance Degradation of LiFePO4/Graphite Lithium-Ion Battery Due to Charge-Discharge Cycling under Different C-Rates

Energies ◽

10.3390/en12234507 ◽

2019 ◽

Vol 12 (23) ◽

pp. 4507 ◽

Cited By ~ 11

Author(s):

Yusuke Abe ◽

Natsuki Hori ◽

Seiji Kumagai

Keyword(s):

Charge Transfer ◽

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Electrochemical Impedance ◽

Specific Capacity ◽

Lithium Ion ◽

Performance Degradation ◽

Charge Transfer Resistance ◽

Transfer Resistance ◽

Charge Discharge

Lithium-ion batteries (LIBs) using a LiFePO4 cathode and graphite anode were assembled in coin cell form and subjected to 1000 charge-discharge cycles at 1, 2, and 5 C at 25 °C. The performance degradation of the LIB cells under different C-rates was analyzed by electrochemical impedance spectroscopy (EIS) and scanning electron microscopy. The most severe degradation occurred at 2 C while degradation was mitigated at the highest C-rate of 5 C. EIS data of the equivalent circuit model provided information on the changes in the internal resistance. The charge-transfer resistance within all the cells increased after the cycle test, with the cell cycled at 2 C presenting the greatest increment in the charge-transfer resistance. Agglomerates were observed on the graphite anodes of the cells cycled at 2 and 5 C; these were more abundantly produced in the former cell. The lower degradation of the cell cycled at 5 C was attributed to the lowered capacity utilization of the anode. The larger cell voltage drop caused by the increased C-rate reduced the electrode potential variation allocated to the net electrochemical reactions, contributing to the charge-discharge specific capacity of the cells.

Download Full-text