Polyol Synthesis of Lithium Iron Phosphate with Carbon Nanotubes: Effect of Dispersion on Crystallinity and Electrochemical Performance

2014 ◽  
Vol 1678 ◽  
Author(s):  
Wesley D. Tennyson
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Black ◽  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
Polyol Synthesis ◽  
Battery Life ◽  
Unique Challenge ◽  
Weight Percentage ◽  
Conductive Additive ◽  
Power Capability

ABSTRACTCarbon nanotubes (CNTs) have been shown to be a viable conductive additive in Li-Ion batteries [1]. By using CNTs battery life, energy, and power capability can all be improved over carbon black, the traditional conductive additive. A significantly smaller weight percentage (5% CNTs) is needed to get the same conductivity as 20% carbon black. Many of the previous efforts found that a combination of conductive additives was most advantageous [2]. Unfortunately many of these efforts did not attend to the unique challenge that dispersing nanotubes presents and used non-optimal methods to disperse CNTs (e.g. ball milling) [3,4]. With poor dispersion a stable and resilient conductive network in the cathode is hard to form with CNTs alone. Here we investigate the formation of LiFePO₄ with CNTs using a polyol process synthesis.

The Hydrothermal Synthesis of Lithium Iron Phosphate

2006 ◽  
Vol 972 ◽  
Author(s):  
Jiajun Chen ◽  
M. Stanley Whittingham
Keyword(s):  
Carbon Nanotubes ◽  
Ascorbic Acid ◽  
High Temperature ◽  
Hydrothermal Synthesis ◽  
Lithium Iron Phosphate ◽  
Electronic Conductivity ◽  
Synthesis Method ◽  
Iron Phosphate ◽  
Cell Dimensions ◽  
Unit Cell Dimensions

AbstractWell-crystalline LiFePO4 particles were successfully prepared in the temperature range between 120 and 220°C, and complete ion ordering was obtained above 175°C where the unit cell dimensions were identical to high temperature material. The use of a soluble reductant, such as sugar or ascorbic acid, was found to minimize the oxidation of the iron to ferric. The electronic conductivity was enhanced by the deposition of carbon from the sugar, or by the addition of carbon nanotubes to the hydrothermal reactor when over 90% of the lithium could be de-intercalated electrochemically. We have extended the hydrothermal synthesis method to the Mn, Co and Ni analogs as well as to the mixed phosphates, such as LiMnyFe1-yPO4.

Effect of LiFePO4 Cathode Thickness on Lithium Battery Performance

2015 ◽  
Vol 827 ◽  
pp. 146-150
Author(s):  
Ariska Rinda Adityarini ◽  
Eka Yoga Ramadhan ◽  
Endah Retno Dyartanti ◽  
Agus Purwanto
Keyword(s):  
Lithium Ion Battery ◽  
Polyvinylidene Fluoride ◽  
Lithium Battery ◽  
Lithium Iron Phosphate ◽  
Active Material ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Structure Characterization ◽  
Cathode Layer ◽  
Conductive Additive

Lithium ion battery is composed of three main parts, i.e. cathode, anode and electrolyte. In this work, we investigated the effect of LiFePO4 cathode composite’s thickness on performances of lithium battery. LiFePO4 cathode was prepared in a slurry that consisted of lithium iron phosphate (LiFePO4) powder as active material, acetylene black as conductive additive, polyvinylidene fluoride (PVDF) as binder, and N-methyl-2-pyrrolidone (NMP) as solvent. The slurry was then deposited on the aluminum substrate using doctor blade method in different thickness. The cathode layers were deposited with the thickness of 150, 200, 250 & 300 μm. The structure characterization of the material was analyzed by XRD, while the material’s morphology was analyzed by Scanning Electron Microscope (SEM). Performances of lithium ion battery with LiFePO4 cathode were evaluated using charge-discharge cycle test. It is found that battery made of cathode layer with 250 μm thickness shows the best performances.

Preparation and Electrochemical Properties of Multicomponent Conductive-Nanocarbon Additives for LFP Battery

NANO ◽  
2020 ◽  
Vol 15 (07) ◽  
pp. 2050093
Author(s):  
Yang Zhou ◽  
Hui Chen ◽  
He Gan ◽  
Yuxi Chen ◽  
Run Li ◽  
...  
Keyword(s):  
Current Density ◽  
Lithium Iron Phosphate ◽  
Retention Rate ◽  
Specific Capacity ◽  
Iron Phosphate ◽  
Acetylene Black ◽  
Conductive Materials ◽  
Conductive Additive ◽  
Milling Method ◽  
Point Line

The conductive additives are often used to improve the conductivity of the electrode in lithium iron phosphate battery. In this work, a series of carbon-based conductive slurries of acetylene black, carbon nanotubes and graphene were obtained by the ball milling method and applied to the cathodes of lithium iron phosphate batteries. The conductivity of the ternary conductive slurry reaches 11.98[Formula: see text]S[Formula: see text]cm[Formula: see text] and the result of Zeta potential indicates that the ternary conductive slurry has the best deposit stability. The average discharge capacity of lithium batteries with ternary conductive additive is 111.3[Formula: see text]mAh[Formula: see text]g[Formula: see text] at the current density of 10C, which is 1.9 times higher than that of acetylene black conductive additive batteries widely used nowadays. The specific capacity of the battery is 129.2[Formula: see text]mAh[Formula: see text]g[Formula: see text] after 200 cycles at the current density of 5C, and the capacity retention rate is 99.7%. The ternary conductive materials can form a continuous “point-line-surface” conductive network, increase the contact sites between lithium iron phosphate particles and conductive materials and provide a more efficient transmission path.

Centrifugation based separation of lithium iron phosphate (LFP) and carbon black for lithium-ion battery recycling

2021 ◽  
Vol 160 ◽  
pp. 108310
Author(s):  
Andreas Wolf ◽  
Andreas Flegler ◽  
Johannes Prieschl ◽  
Thomas Stuebinger ◽  
Wolfgang Witt ◽  
...  
Keyword(s):  
Carbon Black ◽  
Lithium Ion Battery ◽  
Lithium Iron Phosphate ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Battery Recycling
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