ACS Applied Energy Materials
·
2023
·
IF 6.4
Xin Li,Cancan Bian,Jun Zhang,Jian Hong,Rusheng Fu,Xufeng Zhou,Zhaoping Liu,Guangjie Shao
Silicon monoxide (SiOx, x ∼ 1) has emerged as a highly promising candidate for high-energy-density lithium-ion batteries due to its high specific capacity and suitable working potential. Nevertheless, the formation of a large quantity of irreversible products, such as Li2O and lithium silicates, during the initial lithiation process results in a low initial coulombic efficiency (ICE) of SiOx, which is a significant impediment to its commercial application. To overcome this limitation, two lithium aromatic complexes, namely, lithium-naphthalene-2-methyl-tetrahydrofuran (N-LAC) and lithium-biphenyl-2-methyl-tetrahydrofuran (B-LAC), with a low redox potential are used to pre-lithiate SiOx anodes. The differences in lithiation kinetics and efficacy of the two LAC solutions are identified and assessed by scrutinizing the pre-lithiation process of SiOx materials. It is revealed that both pre-lithiation agents produce solid electrolyte interphase (SEI) films on the material surface enriched with substances such as LiF, Li2CO3, and ROCO2Li, but the LiF content in the SEI of the N-LAC pre-lithiated electrode is significantly higher. Furthermore, the surface roughness of the N-LAC pre-lithiated electrode is lower, and the horizontal distribution of mechanical properties and surface potential tend to be more homogeneous, even during cycling, at approximately the same degree of lithiation. The results indicate that the N-LAC solutions not only improve the ICE of the SiOx material but also optimize the interfacial and structural stability of the SiOx electrode. When the pre-lithiated SiOx anode is paired with lithium-rich layered oxide cathode materials, the energy density and ICE are significantly improved compared to the cell using pristine SiOx anode.
研究领域:
材料科学
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电化学
·
电池技术
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xiaoyan Wang,Yonggao Xia,Xiuxia Zuo,Simon J. Schaper,Shanshan Yin,Qing Ji,Suzhe Liang,Zhaohui Yang,Senlin Xia,Ying Xiao,Jin Zhu,Peter Müller-Buschbaum,Ya-Jun Cheng
TiO 2 /SiO x /carbon nanohybrid consisting of super-small sized TiO 2 and SiO x nanoparticles is in situ formed within the in situ formed carbon matrix using difunctional methacrylate monomers as solvent and carbon source. The relative composition of TiO 2 and SiO x is systematically tuned by varying the feeding mass ratio of the precursors (TEOS/TTIP) and HF etching treatment after the carbonization process. The super-small sized TiO 2 and SiO x nanoparticles are well intermixed with each other and homogeneously dispersed throughout the carbon matrix, where a good control over crystallinity, morphology, and microstructure of the nanohybrids is achieved. Synergistic effects are demonstrated from both TiO 2 and SiO x regarding the increased reversible capacity from the SiO x phase and maintenance of good cyclic stability by the TiO 2 component when being used in lithium-ion batteries. A good balance is achieved in terms of reversible capacity, capacity retention, and rate performance in the TiO 2 /SiO 2 /C nanohybrid prepared with the TEOS/TTIP mass ratio of 1.0. The reversible capacities are improved by around two times compared to the SiO x free sample with a good capacity retention of 78 %, which exhibits good rate capability at the current densities up to 3350 mA g −1 as well.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jinyang Ma,Changsheng Song,Siyu Chen,Yanan Xu,Hongbin Du
Sub-valent silicon oxide (SiO x ) is a promising next-generation anode material in lithium-ion batteries. However, SiO x still suffers large volume expansion during the lithiation, resulting in deteriorated battery performance. Herein, we report a low-cost and easy-to-scale-up method to prepare a SiO x -based anode (named as SiO x @G-Ni) by drop-casting the slurry of asphalt , micron-sized SiO x powder, nickel salt and carbon nanotubes onto a Cu foil and subsequent thermal pyrolysis. The obtained electrode consists of a rigid graphenic carbon network that is embedded with micron-sized SiO x , nickel nanoparticles and carbon nanotubes. The SiO x @G-Ni electrode delivers a specific charge capacity of 1061 mA h g −1 at 0.08 A g −1 , and a capacity retention rate of 86.7 % after cycled 500 times at 1.6 A g −1 . The full battery SiO x @G-Ni||LiCoO 2 reaches a capacity retention rate of 79.3 % after 250 cycles at 0.5 C. The method employed in this work could be used for the preparation of the SiO x -based anode for high-performance lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 16
·e202300233
·
IF 2.1
Yang Ling,Yan Peng,Shiyou Guan
Graphical Herein, a series of SiO x /C composites with uniform carbon distribution were prepared by sol-gel method and subsequent pyrolysis process, the carbon content can be easily adjusted just by selecting different organosilanes. Particularly, when BTEB was used as the raw materials, due to the uniformly dispersed of carbon at nanoscale and the appropriate carbon content, the SiO x /C−B exhibited excellent electrochemical performance in LIBs. SiO x /C composites with uniform distribution of silicon oxide (SiO x ) and carbon are promising anodes for lithium-ion batteries. However, designing the SiO x /C composites with uniformly dispersed of carbon at nanoscale and controllable carbon content is still a challenge. Herein, a series of SiO x /C composites with uniform carbon distribution were prepared by sol-gel method and subsequent pyrolysis process, the carbon content can be easily adjusted just by selecting different organosilanes. Due to the uniformly dispersed of carbon at nanoscale, the obtained products showed the excellent energy storage performance. Particularly, when Bis(triethoxysilyl)benzene (BTEB) was used as the raw materials, due to the appropriate carbon content, the SiO x /C−B exhibited a high reversible capacity of 535 mAh g −1 at 0.1 A g −1 over 100 cycles. The cycle stability is preserved even after 300 cycles at a high current density of 1.0 A g −1 , where the electrodes still supply a specific capacity of 389.7 mAh g −1 .
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 7
·7265-7273
·
IF 1.798
Zhang Dongjiu,Cheng Haifeng,Zhang Zhaoyang,Kang Yue
This paper introduced a general method of etching suspended graphene by nonmetallic SiO x nanoparticles (SiO x NPs) in graphene synthesis. Effects of etching time, concentration of silica gel and type of graphene on the etching mode of graphene have been systematically considered with using as-grown graphene film on a silica gel coating copper as model system. Nonmetallic SiO x NPs acted as etchant plays important role in the in situ etching process during the fabrication of graphene. The etched multilayer graphene pattern can be modulated from large area films to a rectangle pattern by varying the Si concentration and etching time, while single layer graphene pattern alters little. The morphology and critical structure of SiO x etched graphene were characterized by Raman spectra, transmission electron microscopy, scanning electron microscope and X-ray photoelectron spectrum. The process and mechanism described here open the way for tailoring graphene via nanoparticles instead of metal, which show significant influence of the electrical properties of graphene.
研究领域:
纳米材料学
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表面科学
·
凝聚态物理
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材料化学
·
电子显微学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qing Sun,Jing Li,Chongyang Hao,Lijie Ci
SiOx-based anode materials are considered to be promising and have been gradually commercialized due to their high specific capacity as well as the acceptable volume change during lithiation/delithiation and preferable cycling stability compared to that of Si. Nevertheless, their inherently low Coulombic efficiency hinders the large-scale application. Up to now, researchers have paid much attention to the initial Coulombic efficiency and developed a series of effective prelithiation strategies. However, the subsequent cycles (focusing on the 2nd to 10th), during which the SiOx anode suffers great lithium consumption as well, have received scarcely any concerns. In this work, a strategy of high-temperature (50 °C) initial charge after an overcapacity prelithiation for a SiOx-based full-cell battery is proposed. As high temperature can promote the reaction between lithium and the SiO2 matrix of SiOx, SiO2 will experience a one-step thorough reduction rather than gradual conversion in subsequent cycles, improving the subsequent Coulombic efficiencies (SCEs) accordingly. Overcapacity prelithiation can be achieved safely at 50 °C without Li metal depositon, just enough to meet the more initial lithium demand of anode at 50 °C. Furthermore, the initial deeper reduction of SiO2 will release extra Si, improving the reversible capacity consequently. With the 50 °C initial charge after an overcapacity prelithiation, the full-cell battery exhibits considerable capacity retention as expected. This work raises concerns on SCEs of SiOx-based anode innovatively, providing a feasible avenue for improving the capacity retention of a SiOx-based full-cell battery.
研究领域:
材料科学
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储能技术
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电化学
·
锂离子电池
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Wei Wu,Man Wang,Ruo Wang,Dongwei Xu,Hongbo Zeng,Chaoyang Wang,Yuliang Cao,Yonghong Deng
SiO x has emerged as an important alternative to silicon as the high capacity anode host to store lithium due to its smaller volume change upon lithiation . However, conventional synthesis methods generally require harsh reaction conditions, making its production in industrial scale much challenging. Herein, a safe, economical and scalable approach is developed for SiO x using highly abundant natural silica as starting material via a magnesio-mechanochemical reduction process induced by ball-milling. The as-prepared SiO x is intrinsically porous and comprised of mixed nano clusters of SiO 2 and Si. Upon lithiation, SiO 2 nano domains convert into lithium silicates and Li 2 O, which help to absorb Si volume expansion and participate in the formation of a stable solid electrolyte interface. Such synergistic effect leads to exceptional cycling stability up to 2000 cycles with 71.3% capacity retention under 4 A g −1 . After blending with graphite, a high areal capacity of 2.64 mAh cm −2 demonstrates stable cycling of 89.7% retention over 200 cycles with an high initial Coulombic efficiency of 82.3%, implying the feasibility for practical applications. Structural and compositional characterizations reveal the involved chemistry and evolution mechanism of the formed solid electrolyte interface upon cycling, providing guidelines of designing future silicon-based materials for future Li-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Wei Wu,Yuanyuan Kang,Man Wang,Dongwei Xu,Jun Wang,Yuliang Cao,Chaoyang Wang,Yonghong Deng
Constructing a stable microstructure is highly crucial in promoting the practical applications of Si-based negative electrodes , addressing the issues of huge volume change and unstable solid electrolyte interface (SEI). Herein, an integrated electrode structure is developed based on micro-sized SiO x particles by bilayers coating of carbon and poly(3,4-ethylene dioxythiophene) (PEDOT) with carbon nanotube/Super P conductive network in-situ embedded (SiO x @C@P_CS). The as-prepared SiO x @C@P_CS negative electrode exhibits high Coulombic efficiency reaching 99.9% and capacity retentions of 86.7% (1019 mAh g −1 ) after 1000 cycles at 750 mA g −1 and 98.4% (973 mAh g −1 ) after 400 cycles at 1500 mA g −1 (with a commercial-level areal capacity of 2.57 mAh cm −2 ). The excellent long cycling capability is further evidenced both in half cell with ultrahigh areal capacity up to 11.75 mAh cm −2 at the mass loading of 8.66 mg cm −2 and Li[Ni 0.8 Co 0.1 Mn 0.1 ]O 2 (NCM811)||SiO x @C@P_CS full cell with commercial loading. The improved electrochemical performance is attributed to the synergistic effects of the bilayers. This study offers a facile solution to the challenges facing alloying-type negative electrode materials with huge volume changes by confining volume change, enhancing electric conductivity , and isolating the growth of SEI to promote their practical uses.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Small
·
2023
·
IF 13.3
Shuyang Peng,Di Liu,Keyu An,Zhiqin Ying,Mingpeng Chen,Jinxian Feng,Kin Ho Lo,Hui Pan
Green hydrogen is considered to be the key for solving the emerging energy and environmental issues. The photoelectrochemical (PEC) process for the production of green hydrogen has been widely investigated because solar power is clean and renewable. However, mass production in this way is still far away from reality. Here, a Si photoanode is reported with CoO x as co-catalyst for efficient water oxidation. It is found that a high photovoltage of 350 mV can be achieved in 1.0 m K 3 BO 3 . Importantly, the photovoltage can be further increased to 650 mV and the fill factor of 0.62 is obtained in 1.0 m K 3 BO 3 by incorporating Mo into CoO x . The Mo-incorporated photoanode is also highly stable. It is shown that the incorporation of Mo can reduce the particle size of co-catalyst on the Si surface, improve the particle-distribution uniformity, and increase the density of particles, which can effectively enhance the light absorption and the electrochemical active surface area. Importantly, the Mo-incorporation results in high energy barrier in the heterojunction. All of these factors are attributed to improved the PEC performance. These findings may provide new strategies to maximize the solar-to-fuel efficiency by tuning the co-catalysts on the Si surface.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Chenchen Wu,Caixin Zuo,Zhongxi Wu,Ting Yang,Yafeng Li,Nae-Lih Wu,Mingdeng Wei
The development of new high-performance binders is an effective strategy for lithium-ion batteries to cope with the volume expansion of SiO x anodes during cycling. In this study, a strategy is adopted for utilizing pre-lithiated sodium alginate (SA-LiCl 40 ) as a high-performance SiO x anode binder. The addition of LiCl not only enables the linear SA binder to link into a three-dimensional network structure but also enriches a large number of lithium carboxylate groups, improving the Li + transport rate within the anode. As a result, the mechanical properties of the binder increase, and interfacial adhesion between the copper current collector and the SiO x anode stabilizes, efficiently inhibiting volume expansion while enhancing cycling stability and initial Coulombic efficiency (ICE). When SA-LiCl 40 serves as the binder for the SiO x anode, the ICE significantly improves by 13.5 %. A discharge capacity of 918.2 mA h g −1 is obtained after 100 cycles, and a high reversible capacity of 791.9 mA h g −1 is achieved after 300 cycles at 1 A g −1 . Therefore, this work provides novel insights into developing new binders for high-performance SiO x anodes in lithium-ion batteries.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Fangbao Fu,Zhou Huang,Shuoyang Qiu
The low-cost and high-capacity SiOx is widely recognized as an ideal anode material for lithium storage; however, the challenges of low conductivity and significant volume expansion still need to be addressed. In this work, we incorporated SiOx into a lignin-derived carbon material with an elevated nitrogen content through a step-by-step carbonization strategy. Initially, the electrostatic assembly facilitated the formation of a complex comprising modified lignin and SiO2, which was subsequently subjected to carbonization and etching steps. Finally, due to zinc species inhibiting nitrogen decomposition, the cocarbonization of the lignin porous carbon/SiOx complex, zinc oxalate, and melamine enabled the construction of a nitrogen-enriched carbon/SiOx composite. The resulting carbon/SiOx composite exhibited a moderate specific surface area, abundant mesoporous channels, and an exceptionally high nitrogen doping content of 17.91 at. %. These characteristics effectively enhanced the storage and transportation of lithium ions while mitigating the volume expansion. As anodes in half batteries, the reversible specific capacity of the optimized carbon/SiOx reached 894 mAh/g during stable cycles, which was attributed to the enhanced ion diffusion rate and storage kinetics resulting from the high nitrogen content as well as the improved structural stability due to the encapsulated structure. Furthermore, the assembled lithium-ion capacitor demonstrated an energy density of 82 Wh/kg and maintained a capacity retention rate of 93.1% after undergoing 15,000 cycles. This work presents a novel concept for the synthesis of nitrogen-rich carbon matrixes but also offers insights into the structural optimization of silicon-based negative electrodes using green biomass.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Xiaoyong Yang,Changzhen Zhan,Deping Xu,Ding Nan,Ruitao Lv,Wanci Shen,Feiyu Kang,Zheng-Hong Huang
The practical application of silicon (Si) anode with high theoretical capacity has not yet satisfied the commercial requirements of lithium-ion batteries (LIBs) due to serious degradation electrochemical properties arising from large volume expansion and deteriorated electrode architecture during cycling. Co-utilization of Si and graphite has become a commercially feasible method for realizing high-energy LIBs. Herein, we have synthesized a nitrogen-doped Si-graphite composite microspheres enhanced by three-dimensional carbon network by spray drying method. The three-dimensional network carbon structure generated by sodium alginate carbonization can further enhance the structural stability of the material and be favorable to the rapid transfer of electrons. The Si particle surface is partial converted into silicon oxide (SiO x ) phase during sodium alginate carbonation process, which is beneficial to restrain the volume expansion effect of Si and enhance the electrochemical performance of the material. The fabricated SiO x @Si-graphite composite microspheres enhanced by three-dimensional carbon network is prospective for practical application in high-performance LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）