Charge capacity and nonuniformity limited performance

1992 ◽  
Author(s):  
J. D. Calvert
Keyword(s):  
Charge Capacity

Preparation and Performance of Si/Al/C Composites Anode Material Prepared by Glucose-Modified

2012 ◽  
Vol 164 ◽  
pp. 268-271
Author(s):  
Xu Ma ◽  
Ling Long Kong ◽  
Yu Ling Liu ◽  
Yan Hong Ding ◽  
Jie Zhao ◽  
...  
Keyword(s):  
Anode Material ◽  
Coulombic Efficiency ◽  
Test System ◽  
Cycling Stability ◽  
Charge Capacity ◽  
And Performance ◽  
Charge Discharge ◽  
Discharge Test

Si/Al/C composites were synthesized by the method of doping aluminum and glucose-modified. The samples were characterized by XRD, SEM, and the capacity and cycling stability of the composites were tested by electrochemical charge/discharge test system. After glucose was pyrolyzed, the first discharge and charge capacity of Si/Al/C composites were 1312 and 956.7mAh/g, and the first coulombic efficiency was 72.9%. After 50 cycles, the capacity of Si/Al/C composites was 440mAh /g and the coulombic efficiency remained over 98.1%

Study on Prelithiation Technology of Hard Carbon Electrode Using Stable Metal Lithium Powder

2018 ◽  
Vol 16 (2) ◽  
Author(s):  
Yan-Xian Sun ◽  
Hong-Min Guan ◽  
Zhao-Hua Jiang ◽  
Zhen-Bo Wang
Keyword(s):  
Protective Layer ◽  
Utilization Efficiency ◽  
Carbon Electrode ◽  
Lithium Insertion ◽  
Hard Carbon ◽  
Charge Capacity ◽  
Full Contact ◽  
Initial Charge ◽  
Powder Content ◽  
Lithium Powder

The prelithiation of hard carbon electrode using stable metal lithium powder to compensate the lithium loss during the first lithium insertion is studied in this work. The results show that when the pressure on lithium powder surface is 6 MPa, the Li2CO3 protective layer on the surface of stable metal lithium powder is completely squeezed, which is conducive due to the full contact between the metal lithium and the hard carbon. The prelithiation of hard carbon has little effect on the initial charge capacity and cycle life. Both the pre-lithium capacity and the utilization efficiency of lithium powder increase with the increasing of the lithium powder content, and when the amount of lithium powder is 3 g m−2, the utilization efficiency of lithium powder is 56%.

Preparation and Electrochemical Properties of Amorphous Tin-Copper Composite Oxide CuSnO3

2012 ◽  
Vol 535-537 ◽  
pp. 31-35
Author(s):  
Tao Liu ◽  
Rong Bin Du ◽  
Xue Jun Kong
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Anode Materials ◽  
Average Particle Size ◽  
Lithium Ion ◽  
Average Particle ◽  
Charge Capacity ◽  
Composite Oxides ◽  
Transmission Electron ◽  
Copper Composite

Composite oxides materials CuSnO3as anode materials for lithium-ion batteries were synthesized by chemical coprecipitation method using SnCl4•5H2O, NH3•H2O and Cu(NO3)2•3H2O as raw materials.The precursor CuSn(OH)6and CuSnO3powders were characterized by thermogravimertric(TG) analysis and differential thermal analysis(DTA), X-ray diffraction(XRD), and transmission electron microscope (TEM). The electrochemical properties of CuSnO3powders as anode materials of lithium ion batteries were investigated comparatively by galvanostatic charge-discharge experiments. The results show the average particle size of amorphous CuSnO3is 70nm. The initial capacity during the first lithium insertion is 1078 mA•h/g and the reversible charge capacity in first cycle is 775 mA•h/g. After 20 cycles, the charge capacity is 640 mA•h/g and this material shows moderate capacity fading with cycling. As a novel anode material for lithium ion batteries, amorphous CuSnO3demonstrates a large capacity and a low insertion potential with respect to Li metal.

scholarly journals Two-Electron Reaction without Structural Phase Transition in Nanoporous Cathode Material

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Tomoyuki Matsuda ◽  
Yutaka Moritomo
Keyword(s):  
Phase Transition ◽  
Cathode Material ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Discharge Process ◽  
Charge Capacity ◽  
High Charge ◽  
Valence States ◽  
X Ray Absorption ◽  
Charge Discharge

We investigated the charge/discharge properties, valence states, and structural properties of a nanoporous cathode materialLixMn[Fe(CN)6]0.83·3.5H2O. The film-type electrode ofLixMn[Fe(CN)6]0.83·3.5H2Oexhibited a high charge capacity(=128 mAh g-1)and a good cyclability (87% of the initial value after 100 cycles) and is one of the promising candidates for Li-ion battery cathode. X-ray absorption spectra near the Fe and Mn K-edges revealed that the charge/discharge process is a two-electron reaction; that is,MnII–NC–FeII,MnII–NC–FeIII, andMnIII–NC–FeIII. We further found that the crystal structure remains cubic throughout the charge/discharge process. The lattice constant slightly increased during the[FeII(CN)6]4-/[FeIII(CN)6]3-oxidization reaction while decreased during theMnII/MnIIIoxidization reaction. The two-electron reaction without structural phase transition is responsible for the high charge capacity and the good cyclability.

Chloride functionalized carbon nanotube sponge: High charge capacity and high magnetic saturation

Carbon ◽  
2020 ◽  
Vol 164 ◽  
pp. 324-336 ◽  
Author(s):  
Juan L. Fajardo-Díaz ◽  
Florentino López-Urías ◽  
Emilio Muñoz-Sandoval
Keyword(s):  
Carbon Nanotube ◽  
Magnetic Saturation ◽  
Charge Capacity ◽  
High Charge ◽  
Functionalized Carbon Nanotube

scholarly journals In Situ SEM Observation of Structured Si/C Anodes Reactions in an Ionic-Liquid-Based Lithium-Ion Battery

2019 ◽  
Vol 9 (5) ◽  
pp. 956 ◽  
Author(s):  
Huifeng Shi ◽  
Xianqiang Liu ◽  
Rui Wu ◽  
Yijing Zheng ◽  
Yonghe Li ◽  
...  
Keyword(s):  
Morphological Evolution ◽  
Structural Evolution ◽  
Lithium Ion ◽  
Composite Electrodes ◽  
Charge Capacity ◽  
Shed Light ◽  
3D Electrode ◽  
Large Charge ◽  
Scanning Electron

In situ scanning electron microscopy (SEM) offers a good way to investigate the structural evolution during lithiation and delithiation processes. In this paper, the dynamical morphological evolution of 3D-line-structured/unstructured Si/C composite electrodes was observed by in situ SEM. The investigation revealed the microstructural origin of large charge capacity for 3D-line-structured anodes. Based on this proposed mechanism, a coarse optimization of 3D-line-structured anodes was proposed. These results shed light on the unique advantages of using an in situ SEM technique when studying realistic bulk batteries and designing 3D electrode structures.

scholarly journals Soil chemical fertility in dairy farms of the Guanacaste volcanic mountain range, Costa Rica

2015 ◽  
Vol 7 (2) ◽  
pp. 157-163
Author(s):  
Alejandro Saborío-Montero ◽  
Osvaldo Marín-Taylor ◽  
Randall Arguedas-Sánchez ◽  
Sinaí Ramírez-Fallas
Keyword(s):  
Cation Exchange Capacity ◽  
Dairy Farms ◽  
Exchange Capacity ◽  
Soil Samples ◽  
Mountain Range ◽  
Critical Levels ◽  
Mineral Deficiency ◽  
Charge Capacity ◽  
Soil Nutrition ◽  
Nutritional Needs

The aim of this research was to determine the fertility of soils of dairy farms at four zones of the Guanacaste volcanic mountain range. The study was conducted during a two-year period (2009-2010) in farms of Guayabo (Bagaces) and Nubes, San Ramón and Florida (Quebrada Grande, Tilarán). A total of 40 soil samples were collected, each one was composed by 20 sub- samples. The results revealed that soil pH in Guayabo tended to be lower (p=0.0539) than in Nubes, San Ramón and Florida. Guayabo soils showed higher concentrations (p<0.01) of magnesium (Mg), cupper (Cu), iron (Fe) and manganese (Mn) than the soils of the three zones of Tilarán. The soils of Guayabo and San Ramón showed higher values of effective cation exchange capacity (ECEC) (p<0.01) than Nubes and Florida soils. According to the general critical levels for the extracting solution used, none of the soils of the analyzed zones reach a pH higher than 5.5, the Tilarán and Guayabo soils were deficient in Mg and P respectively and no zone was deficient in Zn, Cu, Fe and Mn. These results revealed that the soils of all the zones had some mineral deficiency and low values of pH, therefore fertilizers and amendments should be applied according to nutritional needs of each farm. Adequate soil nutrition could improve productivity of forage and allowed a higher animal charge capacity per unit of area.

Battery Management for Small Hydroponic Systems and Cultivation Experiments

2021 ◽  
Vol 11 (3) ◽  
pp. 21-36
Author(s):  
Satoru Yamaguchi ◽  
Takuya Motosugi ◽  
Yoshihiko Takahashi
Keyword(s):  
Open Circuit Voltage ◽  
Low Cost ◽  
Open Circuit ◽  
State Of Charge ◽  
Battery Management ◽  
Charge Capacity ◽  
Hydroponic System ◽  
Soc Estimation ◽  
Hydroponic Systems ◽  
Electronic Load

A small hydroponic system that can use sustainable energy such as solar power has been developed. However, the amount of power generated is not constant, and in the case of unstable weather, enough power cannot be obtained. Therefore, it is necessary to store the generated energy in a battery. In order to design low-cost charging equipment, it is necessary to use a smaller battery and to estimate the remaining charge capacity (state of charge: SOC) accurately. To provide an accurate SOC estimation for such systems, a fusion of CI (current integral) and OCV (open circuit voltage) methods is proposed. When using this method, it is necessary to frequently disconnect the electronic load. In these experiments, the optimum disconnection duration, the effects on plants of frequent battery disconnection, and cutting off of the lighting were investigated.

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