Enabling the ability of Li storage at high rate as anodes by utilizing natural rice husks-based hierarchically porous SiO2/N-doped carbon composites

Feng, Yi; Liu, Li; Liu, Xiaoyang; Teng, Yifei; Li, Yixin; Guo, Yutong; Zhu, Yanchao; Chao, Yimin

doi:10.1016/j.electacta.2020.136933

Cited by 33 publications

(7 citation statements)

References 59 publications

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“…Researchers assigned this to their arranged nano and porous structure after removing inorganic salts and carbonization. For example, ball-milling of carbonized rice husks gave capacity >500 mA h/g at 0.1 A/g after the 100th cycle . As Figure S3 presents, in our research, there is no silicon oxide powder observed, just silicon–oxygen enrichment areas with nanosizes (about 10 nm, according to Figure ).…”

Section: Results and Discussionsupporting

confidence: 46%

“…For example, ball-milling of carbonized rice husks gave capacity >500 mA h/g at 0.1 A/g after the 100th cycle. 50 As Figure S3 presents, in our research, there is no silicon oxide powder observed, just silicon−oxygen enrichment areas with nanosizes (about 10 nm, according to Figure 3). The nanosize would be helpful for alleviation of the volume expansion as reported.…”

Section: Resultsmentioning

confidence: 46%

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Porous, Encapsulated Si–O–C Lithium-Ion Battery Anode Materials from Silicone-Containing Polyesters: Influences of Graphene Oxides

Wang

Bie

Dong

et al. 2022

ACS Appl. Energy Mater.

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Hydrophilic silicone-modified polyester (Si-PETs) were cured and thermally carbonized to give lithium-ion battery (LIB) anode materials (Si–O–C). Graphene oxides (GOs) were added to Si-PETs, and their effects were analyzed. A preloaded reductant, ascorbic acid, was also added for the purpose of transforming GO to reduced GO (rGO) after Si-PETs were cured. With the cured Si-PET matrix as the barrier, no rGO agglomeration was observed. It is interesting that during carbonization, the insolubility of rGO in Si-PET led to a porous structure, and the well-flexible rGO sheets could be crimped and could encapsulate silicon oxides. Well-dispersed rGO induced a homogeneous porous structure. As LIB anode materials, Si–O–C containing rGO (rGO/Si–O–C) presented higher specific capacities, more stable solid interface films (SEIs), and better cyclabilities. It is suggested that during the charge–discharge process, the porous structure alleviated the volume expansion of Si–O–C, and the encapsulation stabilized the SEI film, thus leading to better performances.

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Section: Results and Discussionsupporting

confidence: 46%

Section: Resultsmentioning

confidence: 46%

Porous, Encapsulated Si–O–C Lithium-Ion Battery Anode Materials from Silicone-Containing Polyesters: Influences of Graphene Oxides

Wang

Bie

Dong

et al. 2022

ACS Appl. Energy Mater.

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“…The broad diffraction peak at 23°o f RH-char is the superimposed reflection from amorphous silica and disordered carbon, indicating the presence of the silica template. 44,45 The narrow peak at 26°of SP-char corresponds to the graphitic carbon structure. 45 The difference in the diffraction peak proves that the pitch offers the soft carbon for the graphitic structure and rice husks offer hard carbon for disordered structure.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Synthesis of Hierarchically Porous Carbon with Tailored Porosity and Electrical Conductivity Derived from Hard–Soft Carbon Precursors for Enhanced Capacitive Performance

Xue

Xiao

2021

ACS Sustainable Chem. Eng.

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Porous carbon has been one of the most promising electrode materials for supercapacitors, and the carbon precursor has a significant impact on the properties of final products. Herein, we report an efficient method to prepare hierarchically porous carbon (HPC) using a hard–soft carbon precursor by mixing biomass and pitch, following with carbonization and KOH activation. Combining the advantages of each single precursor, the resultant RH1SP1-HPC presents a high surface area of 2996 m2 g–1 with the fabrication of a 3D interconnected porous structure and good conductivity. Benefiting from these features, RH1SP1-HPC exhibits a superior electrochemical performance compared with the samples derived from a single precursor with a high specific capacitance of 340 F g–1 at 0.5 A g–1 in a two-electrode system and outstanding rate capability of 87.6% capacitance retention at 20 A g–1. The enhanced capacitive performance demonstrates that the hard–soft carbon precursor is desirable to synthesize porous carbons for energy storage.

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“…Pyridine N and quaternary N are sp 2 hybridized while pyrrole N is sp 3 hybridized. Graphite N, pyridine N, and pyrrole N improve the conductivity of a material, determine the electrochemical activity, and improve the charge transfer, respectively 20 – 23 . Studies have shown that N atoms with two lone pair electrons are more electronegative than C atoms.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional network of nitrogen-doped carbon matrix-encapsulated Si nanoparticles/carbon nanofibers hybrids for lithium-ion battery anodes with excellent capability

Cong

Martino

et al. 2022

Sci Rep

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Three-dimensionally structured silicon (Si)–carbon (C) nanocomposites have great potential as anodes in lithium-ion batteries (LIBs). Here, we report a Nitrogen-doped graphene/carbon-encapsulated Si nanoparticle/carbon nanofiber composite (NG/C@Si/CNF) prepared by methods of surface modification, electrostatic self-assembly, cross-linking with heat treatment, and further carbonization as a potential high-performance anode for LIBs. The N-doped C matrix wrapped around Si nanoparticles improved the electrical conductivity of the composites and buffered the volume change of Si nanoparticles during lithiation/delithiation. Uniformly dispersed CNF in composites acted as conductive networks for the fast transport of ions and electrons. The entire tightly connected organic material of NG/C@Si and CNF prevented the crushing and shedding of particles and maintained the integrity of the electrode structure. The NG/C@Si/CNF composite exhibited better rate capability and cycling performance compared with the other electrode materials. After 100 cycles, the electrode maintained a high reversible specific capacity of 1371.4 mAh/g.

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Enabling the ability of Li storage at high rate as anodes by utilizing natural rice husks-based hierarchically porous SiO2/N-doped carbon composites

Abstract: Enabling the ability of Li storage at high rate as anodes by utilizing natural rice husks-based hierarchically porous SiO 2 /N-doped carbon composites,

Cited by 33 publications

References 59 publications

Porous, Encapsulated Si–O–C Lithium-Ion Battery Anode Materials from Silicone-Containing Polyesters: Influences of Graphene Oxides

Porous, Encapsulated Si–O–C Lithium-Ion Battery Anode Materials from Silicone-Containing Polyesters: Influences of Graphene Oxides

Synthesis of Hierarchically Porous Carbon with Tailored Porosity and Electrical Conductivity Derived from Hard–Soft Carbon Precursors for Enhanced Capacitive Performance

Three-dimensional network of nitrogen-doped carbon matrix-encapsulated Si nanoparticles/carbon nanofibers hybrids for lithium-ion battery anodes with excellent capability

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