Improved cycling properties of a Li-rich and Mn-based Li1.38Ni0.25Mn0.75O2.38 porous microspherical cathode material via micromorphological control

2020 ◽  
Vol 44 (30) ◽  
pp. 13074-13082
Author(s):  
Min Gao ◽  
Fengling Yun ◽  
Jinling Zhao ◽  
Wenjin Li ◽  
Fang Lian ◽  
...  
Keyword(s):  
Cathode Material ◽  
Discharge Rate ◽  
Cycling Performance ◽  
Side Reactions ◽  
Capacity Fading ◽  
High Discharge ◽  
High Discharge Rate ◽  
Primary Particles

The as-prepared LMNO-850 with 100–200 nm spherical-like shape primary particles exhibits superior cycling performance even at high discharge rate. The capacity fading in the first 50 cycles may be caused by interfacial side-reactions between electrode and electrolyte.

scholarly journals Aging Characteristics of Lithium Titanate Batteries under Ultrahigh Discharge Rate

2021 ◽  
Vol 252 ◽  
pp. 02003
Author(s):  
Zehui Liu ◽  
Chu Wang ◽  
Chen Miao ◽  
Yinghui Gao ◽  
Yaohong Sun
Keyword(s):  
Retention Rate ◽  
Discharge Rate ◽  
Active Material ◽  
Lithium Titanate ◽  
Temperature Dependent ◽  
Capacity Fading ◽  
High Discharge ◽  
High Discharge Rate ◽  
Incremental Capacity

The aging characteristics of lithium titanate batteries under ultra-high discharge rate were studied in this paper. The discharge characteristics is highly temperature-dependent under 55C discharge rate. The capacity retention rate is about 73% after 100 cycles of 55C discharge. The in-situ analysis incremental capacity analysis (ICA) was used to analyze the aging mechanism, and it was found that the main reason for the capacity fading was the loss of active material of the positive electrode, which leads to an increase of polarization resistance under 55C discharge rate.

scholarly journals Nanocomposite multilayer capacitors comprising BaTiO3@TiO2 and poly(vinylidene fluoride-hexafluoropropylene) for dielectric-based energy storage

2014 ◽  
Vol 04 (02) ◽  
pp. 1450009 ◽  
Author(s):  
Mojtaba Rahimabady ◽  
Li Lu ◽  
Kui Yao
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Vinylidene Fluoride ◽  
Discharge Rate ◽  
Low Cost ◽  
Breakdown Field ◽  
High Discharge ◽  
High Discharge Rate ◽  
Poly Vinylidene Fluoride ◽  
Multilayer Capacitors

Multilayer dielectric capacitors were fabricated from nanocomposite precursor comprised of BaTiO 3@ TiO 2 core–shell nanosized particles and poly(vinylidene fluoride–hexafluoropropylene) (P(VDF–HFP)) polymer matrix (20 vol%). The multilayer capacitors showed very high discharge speed and high discharged energy density of around 2.5 J/cm3 at its breakdown field (~ 166 MV/m). The energy density of the nanocomposite multilayer capacitors was substantially higher than the energy density of commercially used power capacitors. Low cost, flexible structure, high discharge rate and energy density suggest that the nanocomposite multilayer capacitors are promising for energy storage applications in many power devices and systems.

scholarly journals High Discharge Rate Lithium Ion Batteries with the Composite Cathode of LiFePO4/Mesocarbon Nanobead

2010 ◽  
Vol 177 ◽  
pp. 208-210
Author(s):  
Yi Jie Gu ◽  
Cui Song Zeng ◽  
Yu Bo Chen ◽  
Hui Kang Wu ◽  
Hong Quan Liu ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Room Temperature ◽  
Discharge Rate ◽  
Rate Capability ◽  
Lithium Ion ◽  
Composite Cathode ◽  
Rate Performance ◽  
High Discharge ◽  
High Discharge Rate ◽  
Lifepo4 Cathode

Olivine compounds LiFePO4 were prepared by the solid state reaction, and the electrochemical properties were studied with the composite cathode of LiFePO4/mesocarbon nanobead. High discharge rate performance can be achieved with the designed composite cathode of LiFePO4/mesocarbon nanobead. According to the experiment results, batteries with the composite cathode deliver discharge capacity of 1087mAh for 18650 type cell at 20C discharge rate at room temperature. The analysis shows that the uniformity of mesocarbon nanobead around LiFePO4 can supply enough change for electron transporting, which can enhance the rate capability for LiFePO4 cathode lithium ion batteries. It is confirmed that lithium ion batteries with LiFePO4 as cathode are suitable to electric vehicle application.

scholarly journals EAST RIVER BATTLE FOR SHEEN: SKIMMING AN OIL SHEEN IN A 3- TO 5-KNOT CURRENT

2001 ◽  
Vol 2001 (2) ◽  
pp. 1431-1434
Author(s):  
Dennis E. Connelly ◽  
Dennis J. McCarthy ◽  
John E. Westerlind
Keyword(s):  
New York ◽  
Current Flow ◽  
Discharge Rate ◽  
Water Discharge ◽  
Cooling Water ◽  
High Discharge ◽  
East River ◽  
Discharge Canal ◽  
High Discharge Rate ◽  
Set Up

ABSTRACT This paper explores the challenges involved with the recovery of oil from a discharge canal with limited access and high relative currents. In March 1999, a sheen was observed in the cooling water discharge canal of Consolidated Edison's 2.5-million kilowatt generating station in Queens (New York City), New York At the time the sheen was discovered, the entire station had been shut down for several months for a maintenance outage. As the tide rose and fell in the East River, into which the discharge canal emptied, the oil sheen moved in and out of a 1,000-foot long tunnel connecting the generating station to the canal. The major challenges to the recovery and removal of the oil sheen were: (1) the low over head of the discharge tunnel and canal support girders, which prevented getting a skimmer into the tunnel and canal; (2) the high discharge rate of the station's cooling water pump; and (3) skimming the sheen in a 3-to 5-knot current. Consolidated Edison is a member of Clean Harbors Cooperative, L.L.C, which was brought in to remove the sheen. This was accomplished utilizing two JBF Scientific DIP Belt Skimmers, which were set up parallel to the current flow, and deflection booming.

Characteristic of novel composition Nax[Ni0.6Co0.2Mn0.2]O2 as Cathode Materials for So-dium Ion-Batteries

2017 ◽  
Vol 20 (1) ◽  
pp. 021-024 ◽  
Author(s):  
Byeong-Chan Jang ◽  
Ji-Woong Shin ◽  
Jin-Joo Bae ◽  
Jong-Tae Son
Keyword(s):  
Cathode Material ◽  
Calcination Temperature ◽  
Cathode Materials ◽  
Cycling Performance ◽  
Sodium Content ◽  
High Discharge ◽  
High Discharge Capacity ◽  
Layered Cathode Materials ◽  
Co Precipitation

In this work, novel composition of Nax[Ni0.6Co0.2Mn0.2]O2 (x = 0.5 and 1.0) layered cathode materials were synthesized by using hydroxide co-precipitation and calcined at 850, 900 and 950 °C. We studied the effects of different sodium contents and calcination temperature on the structural and electrochemical properties of this novel cathode material. The change of calcination temperature and sodium content led to different P2-type, P2/P3-type, P2/O3-type, or O3-type structures. The results indicate better electrochemical perfor-mance of the P2-type cathode materials in terms of high discharge capacity and good cycling performance, when compared to P2/P3, P2/O3, and O3-type cathode materials. Na0.5[Ni0.6Co0.2Mn0.2]O2 electrode calcined at 900 °C exhibited a good capacity of 107.15 mAhg-1 and ca-pacity retention over 73 % after 20 cycle. Characterization of this material will help to develop cathode materials for the Na-ion battery cathode.

scholarly journals Estimating the State of Health of Lithium-Ion Batteries with a High Discharge Rate through Impedance

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4833
Author(s):  
Shida Jiang ◽  
Zhengxiang Song
Keyword(s):  
Lithium Ion Batteries ◽  
Relative Error ◽  
Discharge Rate ◽  
Lithium Ion ◽  
Impedance Spectrum ◽  
State Of Health ◽  
High Discharge ◽  
Characteristic Frequencies ◽  
Battery Model ◽  
High Discharge Rate

Lithium-ion batteries are an attractive power source in many scenarios. In some particular cases, including providing backup power for drones, frequency modulation, and powering electric tools, lithium-ion batteries are required to discharge at a high rate (2~20 C). In this work, we present a method to estimate the state of health (SOH) of lithium-ion batteries with a high discharge rate using the battery’s impedance at three characteristic frequencies. Firstly, a battery model is used to fit the impedance spectrum of twelve LiFePO4 batteries. Secondly, a basic estimation model is built to estimate the SOH of the batteries via the parameters of the battery model. The model is trained using the data of six batteries and is tested on another six. The RMS of relative error of the model is lower than 4.2% at 10 C and lower than 2.8% at 15 C, even when the low-frequency feature of the impedance spectrum is ignored. Thirdly, we adapt the basic model so that the SOH estimation can be performed only using the battery’s impedance at three characteristic frequencies without having to measure the entire impedance spectrum. The RMS of relative error of this adapted model at 10 C and 15 C is 3.11% and 4.25%, respectively.

scholarly journals High Discharge Rate Electrodeposited Zinc Electrode for Use in Alkaline Microbattery

2012 ◽  
Vol 12 (5) ◽  
Author(s):  
A. L. Nor Hairin ◽  
Raihan Othman ◽  
Mohd Hanafi Ani ◽  
Hens Saputra
Keyword(s):  
Zinc Chloride ◽  
Discharge Rate ◽  
Supporting Electrolyte ◽  
Active Material ◽  
Bet Surface Area ◽  
Zinc Electrode ◽  
Electrolytic Bath ◽  
High Discharge ◽  
High Discharge Rate ◽  
Mcm 41

High discharge rate zinc electrode is prepared from electrodeposition process. The electrolytic bath consists of zinc chloride as the metal source and ammonium chloride as the supporting electrolyte. The concentration of the supporting electrolyte is varied from zero until 4 M, while the concentration of zinc chloride is fixed at 2 M. The aim is to produce a porous zinc coating with an enhanced and intimate interfacial area per unit volume. These characteristics shall contribute towards reduced ohmic losses, improved active material utilization, and subsequently producing high rate capacity electrochemical cell. Nitrogen physisorption at 77 K is used to measure the BET surface area and pore volume density of the zinc electrodeposits. The electrodeposited zinc electrodes are then fabricated into alkaline zinc-air microbattery measuring 1 cm2 area x ca. 305 µm thick. The use of inorganic MCM-41 membrane separator enables the fabrication of a compact cell design. The quality of the electrodeposited zinc electrodes is gauged directly from the electrochemical performance of zinc-air cell. Zinc electrodeposits prepared from electrolytic bath of 2 M NH4Cl produces the highest discharge capacity.ABSTRAK: Elektrod zink dengan kadar discas tinggi telah dihasilkan dengan proses saduran elektrokimia. Takungan elektrolit terdiri daripada zink klorida sebagai sumber logam dan ammonium klorida sebagai elektrolit sokongan. Kepekatan elektrolit sokongan diubah daripada sifar hingga 4 M, sementara kepekatan zink klorida ditetapkan pada 2 M. Ini bertujuan untuk mendapatkan saduran zink yang poros dengan luas permukaan per unit isipadu dan sentuhan antaramuka yang dipertingkatkan. Ciri-ciri ini akan menyumbang terhadap pengurangan kehilangan disebabkan kerintangan, pertambahan dalam gunapakai bahan aktif dan akhirnya menghasilkan sel elektrokimia berprestasi tinggi. Physisorpsi nitrogen pada 77 K telah digunakan untuk mengukur luas permukaan BET dan isipadu liang saduran zink. Saduran zink kemudiannya dijadikan elektrod bagi bateri mikro zink-udara beralkali dengan saiz 1 cm2 luas x ca. 305 µm tebal. Penggunaan membran tak organik MCM-41 membolehkan pembuatan sel dengan rekabentuk padat. Kualiti elektrod saduran zink telah dinilai secara lansung daraipada prestasi elektrokimia sel zink-udara. Saduran zink yang disediakan daripada takungan elektrolit 2 M NH4Cl menghasilkan kapasiti discas tertinggi.KEY WORDS (keyword)):  Zinc electrodeposition, High discharge rate electrode, MCM-41 separator, Zinc-air cell and Alkaline microbattery.

scholarly journals Comparative Study of Weekly Discharge Rate of Two Solar Batteries Commonly Used in Anambra State

2019 ◽  
pp. 1-13
Author(s):  
Ugbaja, Chikodiri Marymartha ◽  
C. U. Ikeh ◽  
G. N. Egwuonwu
Keyword(s):  
Discharge Rate ◽  
Physical Sciences ◽  
Initial Current ◽  
High Discharge ◽  
Anambra State ◽  
High Discharge Rate ◽  
Solar Battery ◽  
Technical Assessment ◽  
Solar Application ◽  
Solar Batteries

The purpose of this study is to compare the weekly discharge rate of two solar batteries commonly used in Anambra State. The batteries considered were the Indian made battery with specification Luminous, Deep cycle sealed maintenance free batteries solar application, Lum 12V 100Ah 20hr and 3DGP161433 and Chinese made battery with specification Sun-Test std gel battery, 12V-100Ah, 010716w, Cycle use 14.4-15.0V, Stand by use; 13.5-13.8V and Initial current: less than 30A were used to power 2 stand-alone security lights at the Faculty of Physical Sciences, Nnamdi Azikiwe University, Awka. The technical assessment was based on measuring their output voltages bihourly from 19.00 hr to 7.00 hr and estimation of weekly discharge rate of these batteries for a period of two months (eight weeks). From the analysis, the Indian made solar battery has insignificant discharge tendency for the first eight weeks of its use having its discharge rate of -0.034, -0.038, -0.042, -0.037, -0.039, -0.038, -0.039 and -0.036 Volts/hr per week from week one to week eight respectively whereas the Chinese made solar battery has a relatively high discharge rate of Voltage/hr per week within the first eight weeks of its use having its rate at  -0.095, -0.213, -0.103, -0.1, -0.104, -0.1, -0.083 and -0.109Volt/hr per week from week one to week eight. Also, while the Indian made battery is observed to be relatively stable, the Chinese made battery was observed to be very erratic and highly susceptible to discharge within the first eight weeks (two months) of its use. Hence, it is concluded that Indian made battery is preferred to that of Chinese made battery for optimal performance of stand-alone PV syste.

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