Carbon Loaded Nano-Designed Spherically High Symmetric Lithium Iron Orthosilicate Cathode Materials for Lithium Secondary Batteries

Diwakar, K.; Rajkumar, P.; Subadevi, R.; Liu, Wei‐Ren; Huang, Chia-Hung

doi:10.3390/polym11101703

Cited by 7 publications

(2 citation statements)

References 63 publications

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“…In this reaction, diethylene glycol serves as a reducing agent and as a carbon source. After homogeneous mixing, lithium acetate (Alfa Aesar, 98.0% purity, 20.5 mmol), and tetraethyl orthosilicate (Alfa Aesar, 98.0% purity, 10.0 mmol) were added dropwise Energies 2020, 13, 786 3 of 13 into the above solution and the mixture was stirred well at 245 • C for 18 h. Then the obtained LFS materials were washed using isopropanol for five times followed by drying at 120 • C overnight [32].…”

Section: Polyolmentioning

confidence: 99%

Eggshell-Membrane-Derived Carbon Coated on Li2FeSiO4 Cathode Material for Li-Ion Batteries

et al. 2020

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Lithium iron orthosilicate (LFS) cathode can be prepared via the polyol-assisted ball milling method with the incorporation of carbon derived from eggshell membrane (ESM) for improving inherent poor electronic conduction. The powder X-ray diffraction (XRD) pattern confirmed the diffraction peaks without any presence of further impure phase. Overall, 9 wt.% of carbon was loaded on the LFS, which was identified using thermogravimetric analysis. The nature of carbon was described using parameters such as monolayer, and average surface area was 53.5 and 24 m 2 g −1 with the aid of Langmuir and Brunauer-Emmett-Teller (BET) surface area respectively. The binding energy was observed at 285.66 eV for C-N owing to the nitrogen content in eggshell membrane, which provides more charge carriers for conduction. Transmission electron microscopy (TEM) images clearly show the carbon coating on the LFS, the porous nature of carbon, and the atom arrangements. From the cyclic voltammetry (CV) curve, the ratio of the anodic to the cathodic peak current was calculated as 1.03, which reveals that the materials possess good reversibility. Due to the reversibility of the redox mechanism, the material exhibits discharge specific capacity of 194 mAh g −1 for the first cycle, with capacity retention and an average coulombic efficiency of 94.7% and 98.5% up to 50 cycles.Energies 2020, 13, 786 2 of 13 iron silicate (Li 2 FeSiO 4 ) arrived in 2005 with the theoretical capacity twice the time of LiFePO 4 . It is also a safer and environmentally benign cathode material for energy storage applications [17]. Physical and electrochemical factors such as structural imperfection, ion diffusion, and low electronic conduction inhibit the utilization of theoretical capacity [18]. The inherent poor electronic conduction and ionic diffusion must be resolved by adopting some approaches such as particle size reduction [19], metal doping [20], and carbon coating on the surface of LFS [21]. The reduced particle size of LFS paved a way to shorten the Li + diffusion path. Hence, nanosized materials are still emerging in Li-ion batteries [22]. Cation doping is an effective strategy for widening the Li + diffusion channel and increases the output voltage of LFS-based Li-ion batteries [23]. Carbon coating is another effective approach to improve the electronic conductivity of cathodes made from Li 2 FeSiO 4 . Not only does it display excellent conduction behavior, carbon established an ideal matrix for cathode LFS which is due to the high dispersal over the surface. Besides, carbon coating prevents the decomposition of the electrolyte and integrates the particles within the volume. In this LFS, different carbon sources have been used to enhance the conductivity of LFS [24]. In the sol-gel method, sorbitanlaurat was used as carbon source by Qu et al. [25] and obtained the specific discharge capacity of 187 mAh g −1 at 0.1 C. Yen et al. [26] reveals that carbon derived from L-ascorbic acid on LFS exhibits the capacity of 137 mAh g −1 at slow rate (C/16). The biolo...

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Section: Polyolmentioning

confidence: 99%

Eggshell-Membrane-Derived Carbon Coated on Li2FeSiO4 Cathode Material for Li-Ion Batteries

et al. 2020

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“…12)14) Among the all, the rate performance of LFSO can be improved considerably by tailoring the size from micrometer to nanoscale, increasing surface area and by applying particle-level in-situ carbon coating, which both depend upon selection of suitable synthesis techniques. 15), 16) For these reasons, many researchers have attempted to synthesize LFSO using various synthesis methods, including solgel, 19)22) solid-state reaction, 23) hydrothermal methods, 24), 25) molten salt, 26) spay freeze drying, 27) combustion 28) and polyol 18) synthesis. Among all, the solgel has the unique advantage of producing highly phase-pure LFSO nano crystalline powders with an in-situ carbon layer at low temperatures and atmospheric pressure conditions.…”

Section: Introductionmentioning

confidence: 99%

Copolymerization effect on the synthesis of Li<sub>2</sub>FeSiO<sub>4</sub>/C nanocomposites by chemical solution deposition

Padarti

Jupalli

Iimura

et al. 2022

J. Ceram. Soc. Japan

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Olivine-structured lithium iron silicate is one of the promising cathodes for the development of high energy lithium ion batteries. This article describes the synthesis of phase-pure mesoporous Li 2 FeSiO 4 /C nanocomposite particles by a modified solgel processing via the alkoxide route. Controlled polymerization of Si alkoxide mediated partial hydrolysis in conjunction with copolymerization of Fe precursors chelated with citric acid minimized the formation of impurity phases and lowered the crystallization temperature. This approach resulted in high-purity, mesoporous Li 2 FeSiO 4 /C nanoparticles aggregated in the submicrometer range (382 nm on average) and comprising primary nanocrystallites with an average diameter of 20 nm. The residual carbon appears to be coated on Li 2 FeSiO 4 particles with an average thickness of about 2 nm and resembles a graphenelike surface layer. The material exhibits stable electrochemical performance with a reversible capacity of about 164.5 mAh•g ¹1 at a rate of 0.1 C. The good cycling stability is attributed to synergistic effects in our synthesis mechanism that produces in-situ carbon coated Li 2 FeSiO 4 nanocomposites.

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Lithium Transition Metal Orthosilicates‐Based Nanostructured Materials for Rechargeable Lithium‐Ion Batteries

Malakar,

Banaspati,

Sarmah

et al. 2024

Nanostructured Materials for Energy Storage

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Carbon Loaded Nano-Designed Spherically High Symmetric Lithium Iron Orthosilicate Cathode Materials for Lithium Secondary Batteries

Cited by 7 publications

References 63 publications

Eggshell-Membrane-Derived Carbon Coated on Li2FeSiO4 Cathode Material for Li-Ion Batteries

Eggshell-Membrane-Derived Carbon Coated on Li2FeSiO4 Cathode Material for Li-Ion Batteries

Copolymerization effect on the synthesis of Li<sub>2</sub>FeSiO<sub>4</sub>/C nanocomposites by chemical solution deposition

Lithium Transition Metal Orthosilicates‐Based Nanostructured Materials for Rechargeable Lithium‐Ion Batteries

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