scispace - formally typeset
Search or ask a question
Author

Xuan-Manh Pham

Bio: Xuan-Manh Pham is an academic researcher from Chonnam National University. The author has contributed to research in topics: Anode & Cathode. The author has an hindex of 5, co-authored 5 publications receiving 101 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: An outstanding electrochemical performance of Si@SiC-0.5 is attributed to the SiC phase, which acts as a buffer layer that stabilizes the nanostructure of the Si active phase and enhances the electrical conductivity of the electrode.
Abstract: Here, we propose a simple method for direct synthesis of a Si@SiC composite derived from a SiO2@C precursor via a Mg thermal reduction method as an anode material for Li-ion batteries. Owing to the extremely high exothermic reaction between SiO2 and Mg, along with the presence of carbon, SiC can be spontaneously produced with the formation of Si. The synthesized Si@SiC was composed of well-mixed SiC and Si nanocrystallites. The SiC content of the Si@SiC was adjusted by tuning the carbon content of the precursor. Among the resultant Si@SiC materials, the Si@SiC-0.5 sample, which was produced from a precursor containing 4.37 wt % of carbon, exhibits excellent electrochemical characteristics, such as a high first discharge capacity of 1642 mAh g–1 and 53.9% capacity retention following 200 cycles at a rate of 0.1C. Even at a high rate of 10C, a high reversible capacity of 454 mAh g–1 was obtained. Surprisingly, at a fixed discharge rate of C/20, the Si@SiC-0.5 electrode delivered a high capacity of 989 mAh g...

51 citations

Journal ArticleDOI
TL;DR: In this article, a simplified Mg-thermal-reduction method for the production of mass-scalable coral-like bulk-Si powder with a high surface area (38 m2 g−1), broad pore-size distribution (2-200 nm), and 3D interconnected Si structure for application in Li-ion batteries was introduced.
Abstract: Porous Si is considered a potential anode material for next-generation Li-ion batteries (LIBs) because of its high specific capacity, low lithiation/delithiation potential, low cost, and environmental friendliness. In this work, we introduce a simplified Mg-thermal-reduction method for the production of mass-scalable coral-like bulk-Si powder with a high surface area (38 m2 g−1), broad pore-size distribution (2–200 nm), and 3-dimensionally (3D) interconnected Si structure for application in LIBs. The porous, coral-like Si electrode delivered a high reversible capacity of 2451 mA h g−1, corresponding to ∼70% of the theoretical capacity of Si, at a rate of C/10. After 100 cycles, the porous, coral-like Si electrode maintained a capacity of 1956 mA h g−1, corresponding to 79.8% of the initial reversible capacity. Importantly, a reasonably high reversible capacity of 614 mA h g−1 was achieved even at a high rate of 10C. These outstanding results demonstrate that the 3D-networked, porous, coral-like Si powder, synthesized via a NaCl-assisted Mg-thermal-reduction process on a stainless-steel plate over a period of one minute, can be employed as a promising anode material for the next generation of high-energy LIBs.

31 citations

Journal ArticleDOI
TL;DR: The self-encapsulated Sb-C nanocomposite as an anode material for sodium-ion batteries (SIBs) was successfully synthesised using an SbCl3-citrate complex precursor, followed by a drying and calcination process under an inert N2 atmosphere, and exhibited good specific capacity and cyclability.
Abstract: In this study, a self-encapsulated Sb–C nanocomposite as an anode material for sodium-ion batteries (SIBs) was successfully synthesised using an SbCl3–citrate complex precursor, followed by a drying and calcination process under an inert N2 atmosphere When the molar ratio of SbCl3 to citric acid was varied from 1 : 1 to 1 : 4, the Sb–C nanocomposite with a molar ratio of 1 : 3 (Sb–C3) exhibited the highest specific surface area (26597 m2 g−1) and pore volume (0158 cm3 g−1) Furthermore, the Sb–C3 electrode showed a high reversible capacity of 559 mA h g−1 at a rate of C/10 and maintained a high reversible capacity of 430 mA h g−1 even after 195 cycles at a rate of 1C The Sb–C3 electrode exhibited an excellent rate capability of 603, 445, and 357 mA h g−1 at the rates of C/20, 5C, and 10C, respectively Furthermore, a full cell composed of an Sb–C3 anode and a Na3V2(PO4)3 cathode exhibited good specific capacity and cyclability, making the Sb–C composite a promising anode material for high-performance SIBs

31 citations

Journal ArticleDOI
TL;DR: In this article, the incorporation of ultrafine SnO2 particles inside N-doped ordered mesoporous carbon (N-CMK3) is suggested as a method to prepare an ultrastable anode material for Li-ion batteries.

19 citations

Journal ArticleDOI
TL;DR: In this article, a facile and simple synthesis of Sb@C nanosponges by a citrate sol-gel method, accompanied by conventional carbonization in an inert gas, is presented.
Abstract: In this study, we introduce a facile and simple synthesis of Sb@C nanosponges by a citrate sol–gel method, accompanied by conventional carbonization in an inert gas. The synthesized Sb@C nanosponges are comprised of Sb nanoparticles encapsulated by a carbon shell, interconnected to form a highly porous three-dimensional structure. The carbon content in the Sb@C composites is controllable by changing the ratio between the carbon source and the Sb-containing precursor. The resulting sponge-like Sb@C nanocomposites show promising potential as an anode active material for lithium-ion batteries with excellent electrochemical performance involving the specific discharge capacity and rate capability. The optimized Sb@C nanocomposite has a high reversible capacity of 634.4 mA h g−1 with a miniscule capacity loss of 0.0349% per cycle after 100 cycles at a discharge–charge rate of 0.1C. Moreover, even at a remarkably high current rate of 10C, the electrode delivers an impressive reversible capacity of 405.97 mA h g−1. The enhanced properties of the Sb@C nanocomposite, including remarkable lithium storage and outstanding cycling stability, are likely ascribed to the synergetic effect of its three-dimensional nano-architecture of interconnected Sb nanoparticles, which generates sufficient internal void space to accommodate the volume expansion of Sb in the alloying process, and the inclusion of the carbon buffer layer on the Sb nanoparticles.

10 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: The unique structure of this anode solves the swelling problem and enables impressive performance and provides insights into the rational design of alloy anodes for high-energy batteries.
Abstract: Although silicon is a promising anode material for lithium-ion batteries, scalable synthesis of silicon anodes with good cyclability and low electrode swelling remains a significant challenge. Herein, we report a scalable top-down technique to produce ant-nest-like porous silicon from magnesium-silicon alloy. The ant-nest-like porous silicon comprising three-dimensional interconnected silicon nanoligaments and bicontinuous nanopores can prevent pulverization and accommodate volume expansion during cycling resulting in negligible particle-level outward expansion. The carbon-coated porous silicon anode delivers a high capacity of 1,271 mAh g−1 at 2,100 mA g−1 with 90% capacity retention after 1,000 cycles and has a low electrode swelling of 17.8% at a high areal capacity of 5.1 mAh cm−2. The full cell with the prelithiated silicon anode and Li(Ni1/3Co1/3Mn1/3)O2 cathode boasts a high energy density of 502 Wh Kg−1 and 84% capacity retention after 400 cycles. This work provides insights into the rational design of alloy anodes for high-energy batteries. Silicon is a promising anode material for lithium-ion batteries but experiences large volume changes during cycling. Here the authors report a scalable method to synthesize porous ant-nest-like silicons. The unique structure of this anode solves the swelling problem and enables impressive performance.

452 citations

Journal ArticleDOI
TL;DR: This review paper overviews the progress of BCP-templated mesoporous materials over the past 10 years, with an emphasis on the discussions of synthetic methodologies, the control of materials structures (including morphology and pore size/shape), and potential applications particularly in rechargeable batteries, supercapacitors, electro-/photocatalysis, solar cells, etc.
Abstract: Self-assembly of block copolymers (BCPs) provides a versatile strategy for controllable preparation of a broad range of functional materials with different ordered structures. In recent decades, this soft-templating strategy has been widely utilized for preparing a wide range of mesoporous materials. These porous materials have attracted tremendous interest in energy storage and conversion (ESC) applications in view of their ability to absorb, store, and interact with guest species on their exterior/interior surfaces and in the pore space. Compared with other synthetic approaches, such as template-free and hard-templating methods, BCP soft-templating protocols show great advantages in the construction of large mesopores with diameters between 10-60 nm, which are suitable for applications requiring the storage or hosting of large-sized species/molecules. In addition, this strategy shows incomparable merits in the flexible control of pore size/architecture/wall thickness, which determines the final performance of mesoporous materials in ESC devices. In the last decade, rapid development has been witnessed in the area of BCP-templated mesoporous materials. In this review paper, we overview the progress of this field over the past 10 years, with an emphasis on the discussions of synthetic methodologies, the control of materials structures (including morphology and pore size/shape), and potential applications particularly in rechargeable batteries, supercapacitors, electro-/photocatalysis, solar cells, etc.

231 citations

Journal ArticleDOI
TL;DR: A comprehensive review of the recent progresses made in NVP fabrication has been presented, mainly including the strategies of developing NVP/carbon hybrid materials and elemental doping to improve the electronic conductivity of NVP cathodes and designing 3D porous architectures to enhance Na-ion transportation.
Abstract: Sodium-ion batteries (SIBs) are considered to be the most promising electrochemical energy storage devices for large-scale grid and electric vehicle applications due to the advantages of resource abundance and cost-effectiveness. The electrochemical performance of SIBs largely relies on the intrinsic chemical properties of the cathodic materials. Among the various cathodes, rhombohedral Na3V2(PO4)3 (NVP), a typical sodium super ionic conductor (NASICON) compound, is very popular owing to its high Na+ mobility and firm structural stability. However, the relatively low electronic conductivity makes the theoretical capacity of NVP cathodes unviable even at low rates, not to mention the high rate of charging/discharging. This is a major drawback of NVPs, limiting their future large-scale applications. Herein, a comprehensive review of the recent progresses made in NVP fabrication has been presented, mainly including the strategies of developing NVP/carbon hybrid materials and elemental doping to improve the electronic conductivity of NVP cathodes and designing 3D porous architectures to enhance Na-ion transportation. Moreover, the application of NVP cathodic materials in Na-ion full batteries is summarized, too. Finally, some remarks are made on the challenges and perspectives for the future development of NVP cathodes.

186 citations

Journal ArticleDOI
TL;DR: In this paper, the microstructure and electrochemical performance of hard carbon materials pyrolyzed from different parts of plants at different temperatures is summarized. And a full scope of plant-derived hard carbon anode materials and a guideline for the design of high performance hard carbon for sodium ion anodes for SIBs is provided.

101 citations