Effect on the Characteristic and Properties of Carbon Coated LiFePO4/C Composite

LiFePO4/C composite with different types of organic carbon sources has been synthesized by carbon thermal reduction technique. The physical characteristics and electrochemical properties of LiFePO4/C composite have been studied compared with commercial products. It is shown that good carbon-coated LiFePO4/C composite can be obtained with 13wt.% glucose as carbon source, which has effected on the good processing performance due to its suitable specific surface area of 26.3m2/g and high tap density of 1.3g/cm3. Furthermore, it has contributed to the high-rate electrochemical property with discharge capacity of 128mAh/g at 1C (1C=170 mAh/g).

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Effects of Different Organic Carbon Sources on Properties of LiFePO4/C Synthesized by Spray-Drying

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.535.725 ◽

2014 ◽

Vol 535 ◽

pp. 725-728 ◽

Cited By ~ 3

Author(s):

Cheng Lu ◽

Lin Chen ◽

Yun Bo Chen ◽

Yi Jie Gu ◽

Meng Wang ◽

...

Keyword(s):

Particle Size ◽

Carbon Source ◽

Organic Carbon ◽

Specific Surface ◽

Surface Area ◽

Spray Drying ◽

Specific Surface Area ◽

Carbon Sources ◽

Tap Density ◽

Organic Carbon Sources

LiFePO4/C materials were synthesized by spray-drying using FePO4·2H2O, LiOH·H2O as raw materials, with three kinds of organic carbon sources: soluble starch, crystal sugar and glucose. The particle size, tap density, specific surface area, morphology, structure and electrochemical properties of the LiFePO4/C were tested and analyzed. The results indicate that the organic carbon source has no effect on the phase of LiFePO4, but has a remarkable influence on the tap density and specific surface area of LiFePO4. The LiFePO4/C synthesized with crystal sugar and glucose has higher tap density, smaller particle size and specific surface area. The LiFePO4/C synthesized with the glucose as the carbon source exhibited the most excellent electrochemical performance. The discharge capacities are 160.6, 148.5 and 114.1mAh/g respectively at 0.1C, 1C and 5C. Under low temperature 253K, the discharge capacity is 56.2% of that at 298K with 0.2C.

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The rate of iron corrosion for different organic carbon sources during biofilm formation

Water Science & Technology ◽

10.2166/wst.2007.295 ◽

2007 ◽

Vol 55 (8-9) ◽

pp. 489-497 ◽

Cited By ~ 1

Author(s):

S.-K. Park ◽

S.-C. Choi ◽

Y.-K. Kim

Keyword(s):

Carbon Source ◽

Organic Carbon ◽

Corrosion Rate ◽

Humic Substances ◽

Carbon Sources ◽

Biofilm Reactor ◽

Major Constituent ◽

Iron Corrosion ◽

Organic Carbon Sources ◽

Biofilm Bacteria

The effects of total organic carbon and biofilm on microbial corrosion were quantified using serum bottles in a 2×2 factorial design. Both organic carbon and biofilm bacteria had a significant effect on the iron corrosion rate, irrespective of the levels of the other variable (p=0.05). There was no evidence of interaction between organic carbon and biofilm bacteria. Within the tested levels, the addition of exogenous organic carbon increased the corrosion rate by an average of 3.838 mg dm−2 day−1 (mdd), but the presence of biofilm bacteria decreased the rate by an average of 2.305 mdd. More iron was released from the coupon in response to organic carbon. Powder x-ray diffractometry indicated that the scales deposited on the corroded iron surface consisted primarily of lepidocrocite (γ-FeOOH), magnetite (Fe3O4) and hematite (α-Fe2O3). Corrosion rates by different organic carbon sources, i.e. acetate, glucose and humic substances, were compared using an annular biofilm reactor. One-way ANOVA suggested that the effect of each carbon source on corrosion was not the same, with the iron corrosion rate highest for glucose, followed by acetate, humic substances and the control. Magnetite was a major constituent of the corrosion products scraped from iron slides. Examination of community-level physiological profile patterns on the biofilms indicated that acetate was a carbon source that could promote the metabolic and functional potentials of biofilm communities.

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A Review: Carbon Additives in LiMnPO4- and LiCoO2-Based Cathode Composites for Lithium Ion Batteries

Batteries ◽

10.3390/batteries4040050 ◽

2018 ◽

Vol 4 (4) ◽

pp. 50 ◽

Cited By ~ 10

Author(s):

Nam Kwon ◽

Divine Mouck-Makanda ◽

Katharina Fromm

Keyword(s):

Organic Carbon ◽

Lithium Ion Batteries ◽

Critical Role ◽

Electronic Conductivity ◽

Carbon Sources ◽

Lithium Ion ◽

Preparation Methods ◽

Conductive Composites ◽

Tap Density ◽

Organic Carbon Sources

Carbon plays a critical role in improving the electronic conductivity of cathodes in lithium ion batteries. Particularly, the characteristics of carbon and its composite with electrode material strongly affect battery properties, governed by electron as well as Li+ ion transport. We have reviewed here various types of carbon materials and organic carbon sources in the production of conductive composites of nano-LiMnPO4 and LiCoO2. Various processes of making these composites with carbon or organic carbon sources and their characterization have been reviewed. Finally, the type and amount of carbon and the preparation methods of composites are summarized along with their battery performances and cathode materials. Among the different processes of making a composite, ball milling provided the benefit of dense and homogeneous nanostructured composites, leading to higher tap-density and thus increasing the volumetric energy densities of cathodes.

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Assimilation of various organic carbon sources by Haematococcus strains

Acta Agronomica Hungarica ◽

10.1556/aagr.57.2009.2.14 ◽

2009 ◽

Vol 57 (2) ◽

pp. 231-237

Author(s):

M. Zych ◽

A. Stolarczyk ◽

K. Maca ◽

A. Banaś ◽

K. Termińska-Pabis ◽

...

Keyword(s):

Organic Carbon ◽

Organic Compounds ◽

Present Experiment ◽

Carbon Sources ◽

Growth Conditions ◽

Mixotrophic Growth ◽

Naturally Occurring ◽

Organic Carbon Sources ◽

Secondary Carotenoids ◽

Colour Changes

Differences in the assimilation of individual organic compounds (5 mM sugars and L-asparagine) under mixotrophic growth conditions were described for three naturally occurring Haematococcus strains.The effects of assimilation were measured by the growth intensity and size of algal cells, and the effect of colour changes in the cultures was observed. Some compounds caused the cell colouration to change from green to yellow, being the result of chlorophyll disappearance and the accumulation of yellow secondary carotenoids. In the present experiment none of the cultures turned red, thus excluding the intense accumulation of the commercially interesting carotenoid, astaxanthin.

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Polyimide-Derived Carbon-Coated Li4Ti5O12 as High-Rate Anode Materials for Lithium Ion Batteries

Polymers ◽

10.3390/polym13111672 ◽

2021 ◽

Vol 13 (11) ◽

pp. 1672

Author(s):

Shih-Chieh Hsu ◽

Tzu-Ten Huang ◽

Yen-Ju Wu ◽

Cheng-Zhang Lu ◽

Huei Chu Weng ◽

...

Keyword(s):

Carbon Source ◽

Electrochemical Performance ◽

Anode Materials ◽

Lithium Ion ◽

High Rate ◽

Rate Performance ◽

Molecular Arrangement ◽

Thermal Imidization ◽

Carbon Coated ◽

Graphite Structure

Carbon-coated Li4Ti5O12 (LTO) has been prepared using polyimide (PI) as a carbon source via the thermal imidization of polyamic acid (PAA) followed by a carbonization process. In this study, the PI with different structures based on pyromellitic dianhydride (PMDA), 4,4′-oxydianiline (ODA), and p-phenylenediamine (p-PDA) moieties have been synthesized. The effect of the PI structure on the electrochemical performance of the carbon-coated LTO has been investigated. The results indicate that the molecular arrangement of PI can be improved when the rigid p-PDA units are introduced into the PI backbone. The carbons derived from the p-PDA-based PI show a more regular graphite structure with fewer defects and higher conductivity. As a result, the carbon-coated LTO exhibits a better rate performance with a discharge capacity of 137.5 mAh/g at 20 C, which is almost 1.5 times larger than that of bare LTO (94.4 mAh/g).

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