scholarly journals Further Improving Coulombic Efficiency and Discharge Capacity in LiNiO2 Material by Activating Sluggish ∼3.5 V Discharge Reaction

2021 ◽  
Author(s):  
Changgeun Bae ◽  
Nicolas Dupre ◽  
Byoungwoo Kang
Keyword(s):  
Discharge Capacity ◽  
Coulombic Efficiency ◽  
Discharge Reaction

scholarly journals dual-ion charge-discharge behaviors of Na-NiNc and NiNc-NiNc batteries

2021 ◽  
Author(s):  
Jinkwang Hwang ◽  
Rika Hagiwara ◽  
Hiroshi Shinokubo ◽  
Ji-Young Shin
Keyword(s):  
Discharge Capacity ◽  
Electrode Material ◽  
High Stability ◽  
Coulombic Efficiency ◽  
Active Electrode ◽  
High Discharge ◽  
High Discharge Capacity ◽  
Charge Discharge ◽  
High Coulombic Efficiency

Dual-ion sodium-organic secondary batteries were provided with antiaromatic porphyrinoid, NiNc as an active electrode material, which implemented inherent charge-discharge behaviors with high discharge capacity, high stability, high Coulombic efficiency with...

NANOSTRUCTURED SnO2/C COMPOSITE ANODES IN LITHIUM-ION BATTERIES

2003 ◽  
Vol 02 (04n05) ◽  
pp. 299-306 ◽  
Author(s):  
CHIEN-TE HSIEH ◽  
JIN-MING CHEN ◽  
HSIU-WEN HUANG
Keyword(s):  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Coulombic Efficiency ◽  
Sol Gel ◽  
Lithium Ion ◽  
Surface Characteristics ◽  
Carbon Surface ◽  
Cyclic Voltammograms ◽  
Composite Anodes ◽  
Sol Gel Synthesis

Nanostructured SnO 2/ C composites used as anode materials were prepared by sol–gel synthesis to explore electrochemical properties in lithium-ion batteries. Surface characteristics of the SnO 2/ C nanocomposite were analyzed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that nanocrystalline SnO 2/ C with a grain size of 20–50 nm was uniformly dispersed on the carbon surface. After nanocrytalline SnO 2 coated onto carbon, the discharge capacity showed an increase up to 23%, i.e., from 300 to 370 mAh/g at a current density of 0.6 mA/cm2. The nanocomposite anode can achieve a fairly stable discharge capacity and excellent Coulombic efficiency (>99.5%) over 50 cycles. Cyclic voltammograms indicated that the improvements on capacity and cycleability were due to reversible alloying of nanosized Sn and Li on carbon surface.

scholarly journals Improved Electrochemical Performance of Li1.25Ni0.2Co0.333Fe0.133Mn0.333O2 Cathode Material Synthesized by the Polyvinyl Alcohol Auxiliary Sol-Gel Process for Lithium-Ion Batteries

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
He Wang ◽  
Mingning Chang ◽  
Yonglei Zheng ◽  
Ningning Li ◽  
Siheng Chen ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Cathode Material ◽  
Discharge Capacity ◽  
Electrochemical Impedance ◽  
Coulombic Efficiency ◽  
Sol Gel ◽  
Rate Capability ◽  
Lithium Ion ◽  
Transfer Resistance ◽  
Sol Gel Process

A lithium-rich manganese-based cathode material, Li1.25Ni0.2Co0.333Fe0.133Mn0.333O2, was prepared using a polyvinyl alcohol (PVA)-auxiliary sol-gel process using MnO2 as a template. The effect of the PVA content (0.0–15.0 wt%) on the electrochemical properties and morphology of Li1.25Ni0.2Co0.333Fe0.133Mn0.333O2 was investigated. Analysis of Li1.25Ni0.2Co0.333Fe0.133Mn0.333O2 X-ray diffraction patterns by RIETAN-FP program confirmed the layered α-NaFeO2 structure. The discharge capacity and coulombic efficiency of Li1.25Ni0.2Co0.333Fe0.133Mn0.333O2 in the first cycle were improved with increasing PVA content. In particular, the best material reached a first discharge capacity of 206.0 mAhg−1 and best rate capability (74.8 mAhg−1 at 5 C). Meanwhile, the highest capacity retention was 87.7% for 50 cycles. Finally, electrochemical impedance spectroscopy shows that as the PVA content increases, the charge-transfer resistance decreases.

Fabrication of layered Ti3C2 with an accordion-like structure as a potential cathode material for high performance lithium–sulfur batteries

2015 ◽  
Vol 3 (15) ◽  
pp. 7870-7876 ◽  
Author(s):  
Xiaoqin Zhao ◽  
Min Liu ◽  
Yong Chen ◽  
Bo Hou ◽  
Na Zhang ◽  
...  
Keyword(s):  
Cathode Material ◽  
Discharge Capacity ◽  
High Performance ◽  
Coulombic Efficiency ◽  
Initial Discharge Capacity ◽  
Capacity Retention ◽  
Initial Discharge ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

L-Ti3C2 was prepared by exfoliating Ti3AlC2 in 40% HF. With sulfur-loaded L-Ti3C2 as cathodes, Li–S batteries deliver a high initial discharge capacity of 1291 mA h g−1, an excellent capacity retention of 970 mA h g−1 and coulombic efficiency of 99% after 100 cycles.

scholarly journals A Stable, Non-corrosive Perfluorinated Pinacolatoborate Mg Electrolyte for Rechargeable Mg Batteries

2019 ◽  
Author(s):  
Jian Luo ◽  
Yujing Bi ◽  
Liping Zhang ◽  
Xiaoyin zhang ◽  
Tianbiao Liu
Keyword(s):  
Energy Storage ◽  
Electrochemical Performance ◽  
Anode Material ◽  
Discharge Capacity ◽  
High Voltage ◽  
Coulombic Efficiency ◽  
Storage System ◽  
Energy Storage System ◽  
Free Magnesium

Mg batteries are a promising energy storage system because of physicochemical merits of Mg metal as an anode material. However, the lack of electrochemically and chemically stable magnesium electrolytes impedes the development of Mg batteries. In this study, a newly designed chloride-free magnesium fluorinated pinacolatoborate, Mg[B((CF<sub>3</sub>)<sub>4</sub>C<sub>2</sub>O<sub>2</sub>)<sub>2</sub>]<sub>2</sub>(abbreviated as <b>Mg-FPB</b>), was synthesized by convenient methods from commercially available reagents and fully characterized. The <b>Mg-FPB</b>electrolyte delivered outstanding electrochemical performance, specifically, 95% coulombic efficiency and 197 mV overpotential for reversible Mg deposition, and anodic stability up to 4.0 V vs Mg. The <b>Mg-FPB</b>electrolyte was applied to demonstrate a high voltage rechargeable Mg/MnO<sub>2</sub>battery with a discharge capacity of 150 mAh/g.

Integrated Thin-Film Rechargeable Battery on α-Si Thin-Film Solar Cell

2013 ◽  
Vol 788 ◽  
pp. 685-688 ◽  
Author(s):  
Rong Bin Ye ◽  
Ken Yoshida ◽  
Koji Ohta ◽  
Mamoru Baba
Keyword(s):  
Thin Film ◽  
Solar Cell ◽  
Discharge Capacity ◽  
Thin Film Solar Cell ◽  
Coulombic Efficiency ◽  
Short Circuit ◽  
Open Circuit ◽  
Rechargeable Battery ◽  
Dry Process ◽  
Si Thin Film

In this paper we reported on fabrication and characterization of a composite harvesting device integrated thin-film rechargeable battery on α-Si thin-film solar cell. The α-Si thin-film solar cell typically presented open-circuit voltage of 4.3 V, short-circuit current of 15.4 mA/cm2 and efficiency of 7.4%. The thin-film rechargeable battery composed of Nb2O5/LiPON/LiMn2O4 systems fabricated using dry process, which showed the initial discharge capacity of about 215 μAh (or 12.4 μAh/cm2), the cycleabilty for discharge was good at keeping about 12.3 μAh/cm2 with a small decreasing ratio of 0.1% per cycle and the coulombic efficiency was all over 95% for the 100 cycles. On the other hand, the discharge capacity of approximately 80% was provided by the self-charging of the solar cell for 10 min, and the coulombic efficiency was also over 95%.

Electrochemical Performance of SiO/C Composites as Anode Material for Li-Ion Batteries

2015 ◽  
Vol 1092-1093 ◽  
pp. 185-190 ◽  
Author(s):  
Jing Wang ◽  
Mei Juan Zhou ◽  
Feng Wu ◽  
Shi Chen
Keyword(s):  
Discharge Capacity ◽  
Coulombic Efficiency ◽  
Weight Ratio ◽  
Heat Treating ◽  
Li Ion Batteries ◽  
X Ray Diffraction ◽  
Galvanostatic Discharge ◽  
Improved Stability ◽  
Li Ion ◽  
Initial Coulombic Efficiency

Dopamine was used as the carbon precursor to prepare SiO/C composite. Dopamine achieved self-polymerization and covered on the surface of the SiO particles in Tris-buffer, and the SiO/C composites were gained after heat-treating in the tube furnace under Argon. X-ray diffraction ( XRD ) , scanning electron microscope ( SEM ) were used to determine the phases obtained and to observe the morphologies of the composite. The galvanostatic discharge/charge test was carried out to characterize the electrochemical properties of the composite. When the sample of the mixed SiO and dopamine at a weight ratio of 1 : 3, the composite showed the best cycle ability with the discharge capacity of 1362 mAh g−1 in the first cycle, and the initial coulombic efficiency is 55.6%, after 50 cycles, the discharge capacity is 442 mAh g−1. The improved stability of the composite is attributed to carbon-coating forming during heat-treatment process.

Li Storage of Calcium Niobates for Lithium Ion Batteries

2015 ◽  
Vol 15 (10) ◽  
pp. 8103-8107
Author(s):  
Haena Yim ◽  
Seung-Ho Yu ◽  
So Yeon Yoo ◽  
Yung-Eun Sung ◽  
Ji-Won Choi
Keyword(s):  
Thin Film ◽  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Coulombic Efficiency ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Potassium Cation ◽  
Layered Perovskite ◽  
Perovskite Layer ◽  
Negative Material

New types of niobates negative electrode were studied for using in lithium-ion batteries in order to alternate metallic lithium anodes. The potassium intercalated compound KCa2Nb3O10 and proton intercalated compound HCa2Nb3O10 were studied, and the electrochemical results showed a reversible cyclic voltammetry profile with acceptable discharge capacity. The as-prepared KCa2Nb3O10 negative electrode had a low discharge capacity caused by high overpotential, but the reversible intercalation and deintercalation reaction of lithium ions was activated after exchanging H+ ions for intercalated K+ ions. The initial discharge capacity of HCa2Nb3O10 was 54.2 mAh/g with 92.1% of coulombic efficiency, compared with 10.4 mAh/g with 70.2% of coulombic efficiency for KCa2Nb3O10 at 1 C rate. The improved electrochemical performance of the HCa2Nb3O10 was related to the lower bonding energy between proton cation and perovskite layer, which facilitate Li+ ions intercalating into the cation site, unlike potassium cation and perovskite layer. Also, this negative material can be easily exfoliated to Ca2Nb3O10 layer by using cation exchange process. Then, obtained two-dimensional nanosheets layer, which recently expected to be an advanced electrode material because of its flexibility, chemical stable, and thin film fabricable, can allow Li+ ions to diffuse between the each perovskite layer. Therefore, this new type layered perovskite niobates can be used not only bulk-type lithium ion batteries but also thin film batteries as a negative material.

scholarly journals Micron-Sized Monodisperse Particle LiNi0.6Co0.2Mn0.2O2 Derived by Oxalate Solvothermal Process Combined with Calcination as Cathode Material for Lithium-Ion Batteries

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2576
Author(s):  
Zhuo Chen ◽  
Fangya Guo ◽  
Youxiang Zhang
Keyword(s):  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Coulombic Efficiency ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
Commercial Application ◽  
Side Reactions ◽  
Monodisperse Particles ◽  
Voltage Range

Ni-rich cathode LiNixCoyMn1-x-yO2 (NCM, x ≥ 0.5) materials are promising cathodes for lithium-ion batteries due to their high energy density and low cost. However, several issues, such as their complex preparation and electrochemical instability have hindered their commercial application. Herein, a simple solvothermal method combined with calcination was employed to synthesize LiNi0.6Co0.2Mn0.2O2 with micron-sized monodisperse particles, and the influence of the sintering temperature on the structures, morphologies, and electrochemical properties was investigated. The material sintered at 800 °C formed micron-sized particles with monodisperse characteristics, and a well-order layered structure. When charged–discharged in the voltage range of 2.8–4.3 V, it delivered an initial discharge capacity of 175.5 mAh g−1 with a Coulombic efficiency of 80.3% at 0.1 C, and a superior discharge capacity of 135.4 mAh g−1 with a capacity retention of 84.4% after 100 cycles at 1 C. The reliable electrochemical performance is probably attributable to the micron-sized monodisperse particles, which ensured stable crystal structure and fewer side reactions. This work is expected to provide a facile approach to preparing monodisperse particles of different scales, and improve the performance of Ni-rich NCM or other cathode materials for lithium-ion batteries.

scholarly journals High Energy Density Single Crystal NMC/Li6PS5Cl Cathodes for All-Solid-State Lithium Metal Batteries

2021 ◽  
Author(s):  
Christopher Doerrer ◽  
Isaac Capone ◽  
Sudarshan Narayanan ◽  
Junliang Liu ◽  
Christopher Grovenor ◽  
...  
Keyword(s):  
Solid State ◽  
Energy Density ◽  
Single Crystal ◽  
Discharge Capacity ◽  
Coulombic Efficiency ◽  
High Capacity ◽  
Composite Cathode ◽  
High Energy ◽  
High Energy Density ◽  
Composite Cathodes

<div><div><div><p>To match the high capacity of metallic anodes, all-solid-state batteries (ASSBs) re- quire high energy density, long-lasting composite cathodes such as Ni-Mn-Co (NMC)- based lithium oxides mixed with a solid-state electrolyte (SSE). However in practice, cathode capacity typically fades due to NMC cracking and increasing NMC/SSE in- terface debonding because of NMC pulverization, which is only partially mitigated by the application of a high cell pressure during cycling. Using smart processing proto- cols we report a single crystal particulate LiNi0.83Mn0.06Co0.11O2 and Li6PS5Cl SSE composite cathode with outstanding discharge capacity of 210 mAh g−1 at 30 °C. A first cycle coulombic efficiency of >85%, and >99% thereafter, was achieved despite a 5.5% volume change during cycling. A near-practical discharge capacity at a high areal capacity of 8.7 mAh cm−2 was obtained using a novel asymmetric anode/cathode cycling pressure of only 2.5 MPa/0.2 MPa.</p></div></div></div>

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