Effect of Heat Treatment on Charge-Discharge Property of Fluoride Cathode Materials for Li Ion Secondary Batteries

2013 ◽  
Vol 566 ◽  
pp. 131-134 ◽  
Author(s):  
Yasumasa Tomita ◽  
Jinta Kato ◽  
Yoshiumi Kohno ◽  
Yasuhisa Maeda ◽  
Kenkichiro Kobayashi
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Cathode Materials ◽  
Mechanical Milling ◽  
Fine Particle ◽  
Discharge Rate ◽  
Milling Process ◽  
Li Ion ◽  
Discharge Measurements ◽  
Charge Discharge

ron fluoride (III) anhydrate fine particle was prepared by drying in vacuum from FeF3·3H2O, a mechanical milling process and a calcination at 473 773 K. Particle size of FeF3·3H2O was ca. 3 5 μm and that of FeF3 anhydrate was 100 500 nm after drying and milling. FeF3 sample only after drying and milling was hygroscopic and became FeF3·3H2O under atmosphere. FeF3 became stable under atmosphere after oxidation at 673 K for more than 20 minutes. It was found that Fe2O3 was produced by calcination and covered the surface of FeF3 particles. In Charge-discharge measurements, the discharge capacity of these FeF3 samples was 150 - 200 mAh/g at a discharge rate of 0.1 C. The oxidation could improve the discharge properties of FeF3 cathode.

Overlithiation of LiNi0.8Co0.2O2 for Increased Performance in Li-Ion Batteries

2014 ◽  
Vol 938 ◽  
pp. 253-256
Author(s):  
Hashlina Rusdi ◽  
Norlida Kamarulzaman ◽  
Rusdi Roshidah ◽  
Kelimah Elong ◽  
Abd Rahman Azilah
Keyword(s):  
Cathode Materials ◽  
Structural Instability ◽  
Cation Ordering ◽  
Capacity Fading ◽  
Capacity Retention ◽  
Battery Capacity ◽  
Li Ion ◽  
Battery Application ◽  
Charge Discharge ◽  
Better Than

Layered LiNi1-xCoxO2 is one of the promising cathode materials for Li-ion battery application. However, the Ni rich cathode materials exhibit low capacity and bad capacity retention. This is due to factors such as disorder and structural instability when Li is removed during charge-discharge. Overlithiation of cathode materials is expected to improve the cation ordering and structural stability. Good cation ordering will increase the battery capacity. During charge-discharge, the irreversible Li+ loss can be replaced to a certain extent by the interstitial Li+ ions in the lattice of the LixNi0.8Co0.2O2 material. This helps reduce capacity fading of the cathode materials. In this work the overlithiation of LiNi0.8Co0.2O2 is done by interstitially doping Li+ in the LiNi0.8Co0.2O2 materials producing Li1.05Ni0.8Co0.2O2 and Li1.1Ni0.8Co0.2O2. Results showthat the performance of the overlithiated LiNi0.8Co0.2O2 materials is better than pure LiNi0.8Co0.2O2.

MoS2/Graphene Heterostructure Anode for Li-Ion Battery Application: A First-Principles Study

2021 ◽  
Vol 896 ◽  
pp. 53-59
Author(s):  
Yi Yang Shen
Keyword(s):  
Density Of States ◽  
First Principles ◽  
Open Circuit Voltage ◽  
Discharge Rate ◽  
Open Circuit ◽  
Crystal Formation ◽  
Li Ion Battery ◽  
Li Ion ◽  
Battery Anode ◽  
Charge Discharge

The development of next generation Li ion battery has attracted many attentions of researchers due to the rapidly increasing demands to portable energy storage devices. General Li metal/alloy anodes are confronted with challenges of dendritic crystal formation and slow charge/discharge rate. Recently, the prosperity of two-dimensional materials opens a new window for the design of battery anode. In the present study, MoS2/graphene heterostructure is investigate for the anode application of Li ion battery using first-principles calculations. The Li binding energy, open-circuit voltage, and electronic band structures are acquired for various Li concentrations. We found the open-circuit voltage decreases from ~2.28 to ~0.4 V for concentration from 0 to 1. Density of states show the electrical conductivity of the intercalated heterostructures can be significantly enhanced. The charge density differences are used to explain the variations of voltage and density of states. Last, ~0.43 eV diffusion energy barrier of Li implies the possible fast charge/discharge rate. Our study indicate MoS2/graphene heterostructure is promising material as Li ion battery anode.

Effect of Particle Size on Heating Time in Synthesis of Cathode Materials for Li-ion Battery

2011 ◽  
Vol 48 (6) ◽  
pp. 412-416
Author(s):  
Akihiro Kinoshita ◽  
Satoshi Akiyama ◽  
Hiromitsu Suzuki ◽  
Tetsuo Sakai
Keyword(s):  
Particle Size ◽  
Cathode Materials ◽  
Heating Time ◽  
Li Ion Battery ◽  
Effect Of Particle Size ◽  
Li Ion

VO2(B)/Graphene Forest for High-Rate Li-Ion Battery

2015 ◽  
Vol 1773 ◽  
pp. 7-14
Author(s):  
Guofeng Ren ◽  
Zhaoyang Fan
Keyword(s):  
Forest Structure ◽  
High Current Density ◽  
Discharge Rate ◽  
High Rate ◽  
Li Ion Batteries ◽  
3D Scaffold ◽  
Vertically Aligned ◽  
Li Ion ◽  
2D Nanomaterials ◽  
Charge Discharge

ABSTRACT2D nanomaterials, when assembled into an ordered macrostructure, will present many great opportunities, including for Li-ion batteries (LIBs). We report densely-packed vertically-aligned VO2(B) nanobelts (NBs)-based forest structure synthesized on edge-oriented graphene (EOG) network. Using a EOG/Ni foam as a 3D scaffold, aligned VO2(B) NBs can be further synthesized into a folded 3D forest structure to construct a freestanding electrode for LIBs. Electrochemical studies found that such a freestanding VO2(B)/EOG electrode, which combines the unique merits of 2D VO2(B) NBs and 2D graphene sheets, has excellent charge-discharge rate performance. A discharge capacity of 178 mAh g-1 at a rate of 59 C and 100 mAh g-1 at 300 C was measured. A good charge-discharge cycling stability under a high current density was also demonstrated. The results indicate VO2(B)/EOG forest based freestanding electrode is very promising for developing high-rate LIBs.

Mechanical Milling Prepared Ultrafine Al2O3 Particles Utilized in Brush Plating Ni-P-Al2O3 Coatings and Influence of Heat Treatment to the Performance of the Coatings

2013 ◽  
Vol 395-396 ◽  
pp. 755-758
Author(s):  
Ai Zhi Yu ◽  
Lian Wang ◽  
Mao Dong Li ◽  
Jin Mei Lin ◽  
Wen Yu
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Abrasion Resistance ◽  
Mechanical Milling ◽  
Erosion Resistance ◽  
Composite Coatings ◽  
Brush Plating ◽  
Steel Substrates

In this paper, ultrafine Al2O3 particles were prepared by mechanical milling, and Ni-P-Al2O3 composite coatings were plated on Q235 steel substrates by brush-plating, which plating solutions were containing different concentrations Al2O3 particles. The morphology, phase and particle size distribution of the as-prepared Al2O3 particles, and the properties of the coatings after heat treatment were investigated. The results show that, the morphology of the as-prepared Al2O3 particles were spherical and almost size under 200nm, the coatings were uniformly thickness and the Al2O3 particles were uniformly dispersed in the coatings. Heat treatment could improve the performances of the brush-plating Ni-P-Al2O3 layers. After 1 hour heat treatment in 400°C, the layer which phosphoric content about 2.3wt% had high rigidity, good abrasion-resistance and adhesion strength, and the layer which phosphoric content about 10.1wt% has good erosion-resistance after 1h heat treatment in 600°C.

scholarly journals Effect of the Charge Process and Discharge Rate on the Lithium Stripping Process Visibility in LiFePO4-Graphite Li-ion Cells during Charge-Discharge Cycling at 0°C

2020 ◽  
Vol 88 (4) ◽  
pp. 340-342 ◽  
Author(s):  
Omar Samuel MENDOZA-HERNANDEZ ◽  
Eiji HOSONO ◽  
Daisuke ASAKURA ◽  
Hirofumi MATSUDA ◽  
Minoru UMEDA ◽  
...  
Keyword(s):  
Discharge Rate ◽  
Charge Process ◽  
Process Visibility ◽  
Li Ion ◽  
Charge Discharge

scholarly journals Fe–Si networks and charge/discharge-induced phase transitions in Li2FeSiO4 cathode materials

2018 ◽  
Vol 20 (21) ◽  
pp. 14557-14563 ◽  
Author(s):  
Xiaobao Lv ◽  
Xin Zhao ◽  
Shunqing Wu ◽  
Manh Cuong Nguyen ◽  
Zizhong Zhu ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Cathode Materials ◽  
Electrode Materials ◽  
Structural Phase ◽  
Li Ion Batteries ◽  
Structural Phase Transitions ◽  
Li Ion ◽  
Charge Discharge

Structural phase transitions of electrode materials are responsible for poor reversibility during charge/discharge cycling in Li-ion batteries.

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