JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Jiawei Ge,Tao Guo,Honglie Shen,Fei Zhou,Yufang Li,Ningyi Yuan,Wangyang Yang,Zehui Wang,Yajun Xu,Jinzhe Zhang,Yimin A. Wu
The charge/ion transfer and structural stability of silicon suboxide (SiO X ) for lithium-ion batteries (LIBs) are plaguing. Titanate oxide (TiO 2 ) shows zero strain and high ion diffusion for lithiation , promising for improving its electrochemical properties . Herein, hybrid TiO X /SiO X @C (local reduction of TiO 2 for TiO X ) was prepared via magnesiothermic reaction and self-assembled as hierarchical microspheres . The embedded TiO X and hierarchical structures buffer the volume-expansion-induced strain of TiO X /SiO X @C for high structural integrity. Oxygen-vacancy sites around Ti and Si atoms for charge transfer tunnel and the heterostructure for fast interfacial charge response improve its electronic conductivity . The introduction of locally reduced Ti atoms alters oxygen structural dispersion, further reducing Li diffusion barriers . Even, the inevitable crack of TiO X /SiO X induces its exposure to the electrolyte, facilitating a compact solid electrolyte interphase layer for stable electrochemical performance. Thus, its open-circuit voltage curve displays a low lithiation platform due to its low polarization for Si-based anodes. These synergetic findings deliver the optimal TiO X /SiO X @C with high cycling stability (951.6 mAh g −1 at 1A g −1 after 1000 cycles with a capacity retention of ∼87.7%) and superb rate capability (516.5 mAh g −1 at 4 A g −1 ). This work provides a deep understanding of charge/ion kinetics for SiO X -based anodes of LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2026
·
IF 5.8
Yawen Qiao,Hao Pan,Mengyao Gao,Guanhua Jin,Qin Guo,Oleg Viktorovich Tolochko,Mirtemir Shodievich Kurbanov,Puguang Ji,Chengwei Zhang,Gongkai Wang
Silicon suboxide (SiOx, 0 < x < 2) is a promising anode material for lithium-ion (Li-ion) batteries due to its high theoretical capacity, yet the application of SiOx anodes is limited by their low electrical conductivity and drastic volume expansion. Although integrating SiOx nanoparticles with carbon materials can mitigate these issues, achieving both uniform dispersion of SiOx nanoparticles within the carbon matrix and structural stability remains a significant challenge when using only conventional mechanical mixing, surface coating, and sol–gel methods. Herein, a combined sol–gel and soft-templating method is employed to encapsulate mesoporous SiOx@carbon (SiOx@C) spheres (m-SiOx@CS) within a three-dimensionally ordered macroporous carbon (3DOMC) framework, yielding a nanocomposite (3DOMC/m-SiOx@CS). In m-SiOx@CS, the uniformly dispersed SiOx nanoparticles and carbon provide abundant conductive interfaces to enhance reaction kinetics, and the mesoporous structure enables rapid mass transfer. Meanwhile, 3DOMC provides a stable skeleton to ensure the structural stability of the electrode during cycling. As a result, the 3DOMC/m-SiOx@CS electrode exhibits excellent electrochemical performance and cycling stability, maintaining a high reversible capacity of 488.1 mAh g–1 after 2000 cycles at 1 A g–1. Furthermore, the assembled 3DOMC/m-SiOx@CS||LiFePO4 Li-ion full batteries can maintain a high capacity of 82.5 mAh g–1 after 1000 cycles at 1 C. This study offers a broadly applicable structural design strategy for high-performance SiOx-based anodes.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Rongrong Miao,Jinhui Zhu,Shimin Kang,Jun Yang,Jiulin Wang,Jinxia Fu,Minggui Li,Cansheng Shi
Micrometer silicon (MSi) particles are prospective anode material for high energy-density lithium-ion batteries. Aiming at the scale-up production and the improvement in rate capability, a novel sub-micro Si/Sn@SiO x -C (SSSC) composite via a facile two-step process of milling and annealing is designed and synthesized. With the structural uniqueness including in-situ introduction of metallic tin (Sn) originated from mechano-reduction of nano tin dioxide (nano-SnO 2 ) with MSi, dual-buffering of inner SiO x matrix and uniform surface carbon layer , SSSC electrodes exhibit impressive rate capability and stable cyclability. The optimum architecture of SSSC-73 ( i.e. weight ratio of precursor MSi-to-SnO 2 is 7:3) delivers stable cycling with 1102 mAh g − 1 (at 0.5 A g − 1 ) over 100 cycles and exceptional rate performance with a high capacity retention of 95% over 500 cycles at 2 A g − 1 . Particularly, this facile and cost-effective preparation of SSSC composites has no by-products, making it competitive in practical application.
研究领域:
材料科学
·
储能技术
·
电化学
·
纳米材料
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Xiang Li,Li Wang,Zhengguo Gu,Xuanhao Wu,Feiyue Tu,Naiwen Liang,Xiaofan Liu,Wenqing Ma,Zhongchang Wang,Lezhi Yang,Lishan Yang
The prelithiated SiO x anode showcases markedly improved Li-storage capabilities compared to its unlithiated counterparts, yet it faces hurdles such as slurry gassing, electrolyte deterioration, and capacity fade attributed to residual alkali and an unstable electrolyte/anode interface. To tackle these challenges, we propose a strategic utilization of residual alkali by creating an in-situ γ -LiAlO 2 functional layer on the prelithiated SiO x @C anode material. This is accomplished by incorporating a minor amount of Al 2 O 3 into the SiO x @C/LiH precursor mixture before the solid-phase prelithiation process. The resulting modified prelithiated SiO x @C anode with in-situ formed electrolyte-isolating γ -LiAlO 2 layer exhibits no discernible slurry gas generation within 7 days and substantially mitigates side reactions with the electrolyte, thereby boosting the initial coulombic efficiency and cycling stability of the SiO x @C anode. In half-cell evaluations, the prelithiated SiO x @C anode demonstrates a high Li-storage capacity of 1323 mAh g −1 and an impressive initial coulombic efficiency of 91.09%. When assessed in a 3.2 Ah 18650 cylindrical battery, the prelithiated SiO x @C anode showcases exceptional cyclability, retaining 81% of its capacity after 1000 cycles, underscoring its potential for practical applications. This study introduces a scalable and cost-effective prelithiation technique that propels the development and practical deployment of Si-based anodes by resolving persistent scientific challenges with the use of inexpensive additives.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 58
·36697-36704
·
IF 3.108
Lingzhi Qian,Jin-Le Lan,Mengyao Xue,Yunhua Yu,Xiaoping Yang
SiOx-based anodes have attracted tremendous attention owing to their low cost, higher theoretical capacity than graphite and lower volume expansion than pure silicon. In this work, a simple and cost-effective two-step ball-milling method was proposed to fabricate Si/SiOx/C composites by using commercial SiO and graphite carbon as raw materials. The two-step ball-milling synthesis of the Si/SiOx/C composites can avoid the generation of an inert SiC phase and realize the uniform dispersion of Si/SiOx in graphite carbon, which offers good electrical conductivity and relieves the volume expansion of the Si/SiOx phase. Owing to the synergistic effect of the Si/SiOx phase and the graphite carbon, the typical Si/SiOx/C electrode exhibits a stable and high capacity of 726 mA h g−1 after 500 cycles at a current density of 0.1 A g−1 with a capacity retention of 82%. The two-step ball-milling preparation of the Si/SiOx/C composite provides a facile approach to fabricate high-performance SiOx-based anode materials.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Detao Kong,Qinghua Yang,Yaolong He,Hongjiu Hu
Solvent-free electrode fabrication technologies present a promising alternative to conventional wet processes, lowering lithium-ion battery production costs while improving the energy density and manufacturing efficiency. In this study, solvent-free SiOx/C composite electrodes were prepared via polytetrafluoroethylene (PTFE) fibrillation to explore their potential for high-energy-density lithium-ion battery applications. The impact of the PTFE content on the mechanical properties, morphological characteristics, and electrochemical performances of the composite electrodes was systematically investigated. The experimental results demonstrate that PTFE-based SiOx/C electrodes with 5% binder content exhibit optimal fracture elongation and cycling stability. Comparative analysis shows that at equal binder content, solvent-free PTFE-based electrodes exhibit over 20 times higher fracture elongation than conventional wet-processed electrodes and maintain superior structural integrity during charge/discharge cycling. Additionally, the solvent-free process yields a denser microstructure, achieving up to 117.6% higher volumetric capacity compared to wet-processed electrodes.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 15
·7026-7034
·
IF 8.867
Min Zhu,Jie Yang,Zhihao Yu,Haibiao Chen,Feng Pan
Silicon (Si) is a promising anode material for lithium-ion batteries (LIBs) owing to its very high lithium storage capacity; however, fragmentation of Si caused by drastic volume change during lithium insertion and extraction leads to serious capacity decay during cycling. In this work, we report a novel method to synthesize an in situ nanocomposite containing Si nanoparticles evenly embedded in an electrically conductive SiOx@C network (Si/SiOx@C) from one single polysiloxane precursor. In our process, Si nanocrystals were reduced from the polysiloxane precursor using a low temperature molten salt reduction method, and carbon segregated out in the SiOx@C phase which evolved during the subsequent pyrolysis. As an anode material for LIBs, the Si/SiOx@C nanocomposite showed a specific capacity up to 1292 mA h g−1 at a current density of 0.4 A g−1 and 81.84% capacity retention after 200 cycles. The high capacity and stable performance of Si/SiOx@C as an anode material can be attributed to the continuous SiOx@C matrix which provides reliable mechanical support, electronic and ionic conductivity, and a stable solid–electrolyte interphase (SEI). This work demonstrated the viability of deriving a homogenous nanocomposite from a single polymeric precursor, which creates a promising anode material for next-generation LIBs.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）