Structural developments of artificial graphite scraps in further graphitization and its relationships with discharge capacity

2012 ◽  
Vol 75 ◽  
pp. 311-315 ◽  
Author(s):  
Chang-ling Fan ◽  
Huan He ◽  
Ke-he Zhang ◽  
Shao-chang Han
Keyword(s):  
Discharge Capacity ◽  
Artificial Graphite

Effect of Nitric Acid Modification on LiMn2O4 Prepared by Solution Combustion Synthesis

2011 ◽  
Vol 80-81 ◽  
pp. 332-336 ◽  
Author(s):  
Yan Xia ◽  
Mei Huang ◽  
Jun Ming Guo ◽  
Ying Jie Zhang
Keyword(s):  
Nitric Acid ◽  
Combustion Synthesis ◽  
Discharge Capacity ◽  
Retention Rate ◽  
Solution Combustion Synthesis ◽  
Manganese Acetate ◽  
Solution Combustion ◽  
Acid Modification ◽  
Capacity Retention ◽  
Liquid Combustion

Effect of nitric acid and the burning time on the liquid combustion synthesis of spinel LiMn2O4 has been studied, using lithium nitrite and Manganese acetate as raw a material. The results show that the main phases are all LiMn2O4, which can be obtained at 400-600 oC. Before modified, the impurity is Mn3O4 or Mn2O3. After modified, the impurity is only Mn3O4. The aggregation obviously reduced after adding nitric acid, it is indicated that the crystalline increased. With the increasing temperatures, the modified particle size was increased and the aggregation reduced. The initial discharge capacity and cycle stability improved at some extent too. Its first discharge capacity was 104.6, 112.8 and 117.7mAh/g synthesized at 400, 500, 600 oC, respectively, and the 30th capacity retention rate were 84.89%, 80.67% and 73.24%.

scholarly journals Na0.76V6O15/Activated Carbon Hybrid Cathode for High-Performance Lithium-Ion Capacitors

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 122
Author(s):  
Renwei Lu ◽  
Xiaolong Ren ◽  
Chong Wang ◽  
Changzhen Zhan ◽  
Ding Nan ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Energy Density ◽  
Power Density ◽  
Cathode Materials ◽  
Low Cost ◽  
Lithium Ion ◽  
High Energy ◽  
Cycling Stability ◽  
High Energy Density ◽  
Artificial Graphite

Lithium-ion hybrid capacitors (LICs) are regarded as one of the most promising next generation energy storage devices. Commercial activated carbon materials with low cost and excellent cycling stability are widely used as cathode materials for LICs, however, their low energy density remains a significant challenge for the practical applications of LICs. Herein, Na0.76V6O15 nanobelts (NaVO) were prepared and combined with commercial activated carbon YP50D to form hybrid cathode materials. Credit to the synergism of its capacitive effect and diffusion-controlled faradaic effect, NaVO/C hybrid cathode displays both superior cyclability and enhanced capacity. LICs were assembled with the as-prepared NaVO/C hybrid cathode and artificial graphite anode which was pre-lithiated. Furthermore, 10-NaVO/C//AG LIC delivers a high energy density of 118.9 Wh kg−1 at a power density of 220.6 W kg−1 and retains 43.7 Wh kg−1 even at a high power density of 21,793.0 W kg−1. The LIC can also maintain long-term cycling stability with capacitance retention of approximately 70% after 5000 cycles at 1 A g−1. Accordingly, hybrid cathodes composed of commercial activated carbon and a small amount of high energy battery-type materials are expected to be a candidate for low-cost advanced LICs with both high energy density and power density.

Electrospun graphene-wrapped Na6.24Fe4.88(P2O7)4 nanofibers as a high-performance cathode for sodium-ion batteries

2017 ◽  
Vol 19 (26) ◽  
pp. 17270-17277 ◽  
Author(s):  
Yubin Niu ◽  
Maowen Xu ◽  
Chunlong Dai ◽  
Bolei Shen ◽  
Chang Ming Li
Keyword(s):  
Discharge Capacity ◽  
High Performance ◽  
Electronic Conductivity ◽  
Sodium Ion ◽  
High Rate ◽  
Sodium Ion Batteries ◽  
Rate Discharge ◽  
High Rate Discharge

Na6.24Fe4.88(P2O7)4 is one of the intensively investigated polyanionic compounds and has shown high rate discharge capacity, but its relatively low electronic conductivity hampers the high performance of the batteries.

scholarly journals Microwave-Assisted Synthesis of Ge/GeO2-Reduced Graphene Oxide Nanocomposite with Enhanced Discharge Capacity for Lithium-Ion Batteries

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 319
Author(s):  
Ji-Hye Koo ◽  
Seung-Min Paek
Keyword(s):  
Discharge Capacity ◽  
Graphene Nanosheets ◽  
Lithium Ion ◽  
Microwave Assisted Synthesis ◽  
Graphene Composite ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Significant Research ◽  
Long Term Performance ◽  
Term Performance

Germanium/germanium oxide nanoparticles with theoretically high discharge capacities of 1624 and 2152 mAh/g have attracted significant research interest for their potential application as anode materials in Li-ion batteries. However, these materials exhibit poor long-term performance due to the large volume change of 370% during charge/discharge cycles. In the present study, to overcome this shortcoming, a Ge/GeO2/graphene composite material was synthesized. Ge/GeO2 nanoparticles were trapped between matrices of graphene nanosheets to offset the volume expansion effect. Transmission electron microscopy images revealed that the Ge/GeO2 nanoparticles were distributed on the graphene nanosheets. Discharge/charge experiments were performed to evaluate the Li storage properties of the samples. The discharge capacity of the bare Ge/GeO2 nanoparticles in the first discharge cycle was considerably large; however, the value decreased rapidly with successive cycles. Conversely, the present Ge/GeO2/graphene composite exhibited superior cycling stability.

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 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...

Discharge capacity estimation for Li-ion batteries based on particle filter under multi-operating conditions

Energy ◽  
2015 ◽  
Vol 86 ◽  
pp. 638-648 ◽  
Author(s):  
Junfu Li ◽  
Lixin Wang ◽  
Chao Lyu ◽  
Liqiang Zhang ◽  
Han Wang
Keyword(s):  
Particle Filter ◽  
Discharge Capacity ◽  
Operating Conditions ◽  
Li Ion Batteries ◽  
Capacity Estimation ◽  
Li Ion

Effect of sulfur doping on structural reversibility and cycling stability of a Li2MnSiO4 cathode material

2018 ◽  
Vol 47 (35) ◽  
pp. 12337-12344 ◽  
Author(s):  
Xia Wu ◽  
Shi-Xi Zhao ◽  
Lü-Qiang Yu ◽  
Jin-Lin Yang ◽  
Ce-Wen Nan
Keyword(s):  
Cathode Material ◽  
Discharge Capacity ◽  
Cycling Stability ◽  
Initial Discharge Capacity ◽  
Sulfur Doping ◽  
Initial Discharge ◽  
Excellent Cycling Stability

Sulfur has been successfully employed into Li2MnSiO4 and results in a high initial discharge capacity and excellent cycling stability.

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