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SI-induced insertion of Li into SIC to form Li-rich SIC twin crystal

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Particuology 2023年第3期74卷 56-63页

作者： Di Zhang Chenxi Zhang Feng Lu Hairong Jiang Fei Wei Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing100084China

The energy denSIty of Li-ion batteries is closely related to the capacity and average voltage of cathode materials.Unfortunately,current cathode materials either have low capacity or voltage,which limits the development of high-energy-denSIty Li-ion batteries.This has given challenge to many attempts to develop new cathode materials with high capacity and voltage.In this study,we find that Li eaSIly inserts into the(111)plane of SIC in the presence of SI,and a well-organized Li-rich SIC twin crystal is formed.Ultraviolet-viSIble diffuse reflectance spectra and electrochemical test results suggest that this Li-rich SIC twin crystal possesses the band gap energy of 3.5 eV and charging capacity of 1979 mAh/g at the current denSIty of 200 mA/g,making it a promiSIng candidate for the cathode material in high-capacity Li-ion batteries.X-ray photoelectron spectroscopy and high-resolution transmisSIon electron microscopy results reveal that SI-induced Li insertion contributes to the changes in the surface species and structure of pristine SIC.These findings suggest that the Li-rich SIC twin crystal raises new posSIbilities for the development of high-capacity cathode materials and merits further investigation to expand its application scope.

关键词： SI Li insertion SIC Li-rich twin crystal CathodeLi-ion batteries

Constructing the bonding between conductive agents and active materials/binders stabilizes SIlicon anode in Lithium-ion batteries

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Journal of Energy Chemistry 2023年第5期80卷 23-31,I0002页

作者： Jie Tang Jiawang Zhou Xingyu Duan Yujie Yang Xinyi Dai Fuzhong Wu Guizhou High-level Institution Key Laboratory of High-Performance Battery Materials Guizhou UniversityGuiyang 550025GuizhouChina

SIlicon(SI)anode has been conSIdered a promiSIng candidate due to its remarkable theoretical capacity but it was plagued by severe pulverization because of the inherent huge volume variation.Enhancing electrode stability is an effective approach to improve electrochemical performance.Herein,a stable SI anode was established by an innovative construction of the bonding between conductive agents and active materials/binders.As a result,the strong interaction of electrode components not only effectively alleviates the volume expanSIon of SI but also achieves a stable interface by generating the beneficial solid electrolyte interphase(SEI)compoSItion.Attributed to the deliberate scheme of the electrode,the SI anode exhibits sterling electrochemical performance.BeSIdes,the device of the electrode is not only effective for other binders but also for other anode materials with high volume variation,thus shedding light on the rational deSIgn of electrodes for high-energy-denSIty lithium-ion batteries.

关键词： Lithium-ion batteries SI MXene SEI Structural stability

SI对Al⁃1.5Cu⁃0.7Mg合金组织和性能的影响

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金属热处理 2024年第2期49卷 53-59页

作者：谭鑫禹刘静静刘东雨华北电力大学能源动力与机械工程学院北京102206

通过力学性能测试、20℃电阻率测试及显微组织观察,研究了SI加入量为0.3wt%时对Al⁃1.5Cu⁃0.7Mg合金组织和性能的影响。结果表明,当SI加入量为0.3wt%时,Al⁃1.5Cu⁃0.7Mg合金时效态的强度明显提高,经473~493 K峰时效后,其20℃电阻率为3.638... 详细信息

通过力学性能测试、20℃电阻率测试及显微组织观察,研究了SI加入量为0.3wt%时对Al⁃1.5Cu⁃0.7Mg合金组织和性能的影响。结果表明,当SI加入量为0.3wt%时,Al⁃1.5Cu⁃0.7Mg合金时效态的强度明显提高,经473~493 K峰时效后,其20℃电阻率为3.638~3.667μΩ·cm,抗拉强度为370~380 MPa。根据马蒂森定律建立了20℃电阻率与时效析出第二相相对体积分数之间的关系式。利用JMA(Johnson⁃Mehl⁃Avrami)方程得出Al⁃1.5Cu⁃0.7Mg和Al⁃1.5Cu⁃0.7Mg⁃0.3SI合金的时效析出激活能分别为135 kJ/mol和204 kJ/mol,由此可判定,Al⁃1.5Cu⁃0.7Mg合金以S″相为主,Al⁃1.5Cu⁃0.7Mg⁃0.3SI合金以S相为主。由JMA方程对其他时效参数下的电阻率进行预测,预测模型的准确性在99%以上。

关键词： Al⁃1.5Cu⁃0.7Mg合金 SI 电阻率抗拉强度第二相析出激活能

Evolution of MnO-SIO2-Al2O3-MgO incluSIons during heat treatment at 1100 degree celSIus

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JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL 2024年第5期31卷 1221-1231页

作者： Lei, Xu-bo Li, Jian-li Zeng, Qiang Zhu, Hang-yu Yu, Yue Wuhan Univ Sci & Technol State Key Lab Refractories & Met Wuhan 430081 Hubei Peoples R China Wuhan Univ Sci & Technol Hubei Prov Key Lab New Proc Ironmaking & Steelmaki Wuhan 430081 Hubei Peoples R China Wuhan Univ Sci & Technol Minist Educ Key Lab Ferrous Met & Resources Utilizat Wuhan 430081 Hubei Peoples R China

To investigate the evolutionary behavior of the MnO-SIO2-Al2O3-MgO incluSIons during heat treatment, water quenched samples were isothermally held at 1100 degree celSIus for 120 min in Ar and air atmosphere, and the obtaining samples were analyzed by X-ray diffraction, scanning electron microscopy and energy disperSIve spectrometer. It showed that 3MnO center dot Al2O3 center dot 3SIO(2) and MnO center dot SIO2 were detected in the 5 wt.% MgO system after isothermal holding in Ar atmosphere, while MgO center dot Al2O3, MnO center dot SIO2 and Mn7O8 center dot SIO4 were detected in air atmosphere. The evolutionary behavior of the 10, 15 and 20 wt.% MgO systems after isothermal holding in different atmosphere were conSIstent. Oxygen affected the solid phase transformation of the low MgO content systems. The calculation results of FactSage 8.1 showed that MgO center dot Al2O3 was formed in the 5 wt.% MgO system with air atmosphere. The solid phase transformation was accompanied by grain coarsening during the isothermal holding process. The differences in the solid phase transformation in different atmosphere of the 5 wt.% MgO system indicated that it was a gas-phase transport grain coarsening mechanism. The enrichment of Al element in the liquid phase region at the grain edges, the homogeneous distribution of Mg element and the disappearance of the liquid phase within the crystal revealed that other MgO content systems were liquid-solid transport grain coarsening mechanism.

关键词： Evolution Glassy phase IncluSIon Heat treatment MgO center dot Al2O3 MN-KILLED STEEL OXIDE INCLUSIONS FORMATION MECHANISM LOW BASICITY TOP SLAG SI

Ti-Al共掺杂SI薄膜的光电性能增强机理研究

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功能材料 2023年第10期54卷 10021-10029,10038页

作者：陈玉杰杨洪旺林宇蓓邝向军温才西南科技大学数理学院四川绵阳621010 西南科技大学材料与化学学院四川绵阳621010

Ti超掺杂SI(SI:Ti)薄膜是通过脉冲激光的非平衡作用,在SI中掺入超固溶度3个数量级以上的高浓度Ti杂质形成。它摆脱了SI禁带宽度的限制,具有优异的亚带隙近红外(λ=1100~2500 nm)光吸收性能。通过真空电子束蒸发结合紫外纳秒激光熔融的方... 详细信息

Ti超掺杂SI(SI:Ti)薄膜是通过脉冲激光的非平衡作用,在SI中掺入超固溶度3个数量级以上的高浓度Ti杂质形成。它摆脱了SI禁带宽度的限制,具有优异的亚带隙近红外(λ=1100~2500 nm)光吸收性能。通过真空电子束蒸发结合紫外纳秒激光熔融的方式,制备了Ti-Al共掺杂SI(SI:(Ti-Al))薄膜,以进一步提高薄膜的亚带隙近红外光吸收性能,更好地满足近红外器件的需求。研究结果表明,SI:(Ti-Al)薄膜的薄层电阻,由本征单晶SI衬底的10^(4)Ω/square量级降低至10^(2)Ω/square量级,与SI:Ti薄膜一致。但是,SI:(Ti-Al)薄膜在亚带隙近红外波段的吸光度,较本征单晶SI衬底平均提高了7倍,最大提高了一个数量级(λ=1800 nm处);较SI:Ti薄膜平均提高了33%,最大提高了57.2%(λ=1200 nm处)。表面形貌分析表明,SI:(Ti-Al)薄膜的二次激光加工降低了表面光反射。薄膜成分分析表明,SI:(Ti-Al)薄膜中存在TiSI_(2)和AlTi。TiSI_(2)的存在表明,Ti杂质被激活后与SI原子键合。AlTi的存在并结合能带结构分析表明,SI:(Ti-Al)薄膜中通过改变Al补偿杂质浓度,调节费米能级位置,从而增强了亚带隙近红外光吸收性能。

关键词：纳秒激光共掺杂 SI 电学性能光吸收性能费米能级

SI含量对高碳贝氏体钢微观组织与性能的影响

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金属热处理 2023年第9期48卷 165-173页

作者：戴钊郭智龙晓燕冯晓勇刘伟张福成李艳国燕山大学亚稳材料制备技术与科学国家重点实验室河北秦皇岛066004 秦皇岛港股份有限公司第七港务分公司河北秦皇岛066004 广州航海学院轮机工程学院广东广州510725 华北理工大学冶金与能源学院河北唐山063210

以4种不同SI含量的高碳贝氏体轴承钢为研究对象,在相同热处理条件下,通过热膨胀相变仪、X射线衍射仪、扫描电镜和透射电镜等技术研究SI含量对高碳贝氏体轴承钢相变、组织特征及力学性能的影响。结果表明,SI能够延长高碳贝氏体轴承钢贝... 详细信息

以4种不同SI含量的高碳贝氏体轴承钢为研究对象,在相同热处理条件下,通过热膨胀相变仪、X射线衍射仪、扫描电镜和透射电镜等技术研究SI含量对高碳贝氏体轴承钢相变、组织特征及力学性能的影响。结果表明,SI能够延长高碳贝氏体轴承钢贝氏体转变孕育期,降低贝氏体转变速率并提高Ac_(1)、Ac_(cm)温度。随着钢中SI含量的增加,高碳贝氏体轴承钢中残留奥氏体体积分数增大,但贝氏体铁素体板条尺寸减小;当SI含量达到1.4%时,贝氏体铁素体板条尺寸达到纳米级且板条内无碳化物析出。力学性能结果表明,高碳贝氏体轴承钢硬度随SI含量的增加而降低,冲击性能随SI含量的增加而升高,SI含量为1.4%时高碳贝氏体轴承钢具有最佳的综合力学性能。

关键词： SI 高碳贝氏体钢显微组织硬度冲击吸收能量

Improving open-circuit voltage and short-circuit current of high-efficiency SIlicon-based planar heterojunction solar cells by combining V_(2)O_(5)with PEDOT:PSS

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Journal of Materiomics 2023年第3期9卷 438-446页

作者： Zhiting Luo Chen Yang Xiuhua Chen Wenhui Ma Shaoyuan Li Kaixin Fu School of Materials and Energy Yunnan UniversityYunnan650500China Yunnan SIlicon Materials Engineering Technology Research Center Kunming University of Science and Technology650093China National Joint International Research Center for Optoelectronic Energy Materials Yunnan UniversityYunnan650500China

In recent years,a novel PEDOT:PSS/n-SI planar heterojunction solar cell has been extenSIvely studied in the photovoltaic field.Different V_(2)O_(5)-IPA concentrations mixed in PEDOT:PSS samples as hole transport layer were prepared by means of spin coating technique and mechanical mixing of organic and inorganic materials.V_(2)O_(5)was studied for its effects on the surface morphology,chemical compoSItion,and optical transmittance of PEDOT:PSS films.The findings of the study show that the addition of V_(2)O_(5)particles changes the surface morphology of PEDOT:PSS films and promotes its superior ohmic contact with the SI interface.Furthermore,PEDOT:PSS incorporated with V_(2)O_(5)particles that have outstanding optical and semiconductor properties reduces the rate of carrier recombination at the device interface and blocks electron transport to the anode in the fabricated SI-based solar cells.When compared to conventional PEDOT:PSS/SI planar heterojunction solar cells,the fill factor,photoelectric converSIon efficiency,open-circuit voltage,and short-circuit current denSIty of the devices prepared in this study can be SIgnificantly improved,reaching up to 70.98%,15.17%,652 mV and 32.8 mA/cm^(2),respectively.This research provides a promiSIng and effective method for improving the photoelectric converSIon performance of PEDOT:PSS/SI heterojunction solar cells,which enables the application of V_(2)O_(5)in SI solar cells.

关键词： SI PEDOT:PSS Heterojunction photovoltaic devices V_(2)O_(5)-IPA High conductivity Semiconductor film

SI衬底Cu_(2)ZnSnS_(4)太阳能电池的数值分析

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物理学报 2021年第10期70卷 340-348页

作者：刘辉城许佳雄林俊辉广东工业大学材料与能源学院广州510006

在SI衬底上制备的Cu_(2)ZnSnS_(4)(CZTS)太阳能电池具有CZTS与SI衬底的晶格失配低的优点,但目前其转换效率仍较低.本文采用异质结太阳能电池仿真软件Afors-het对SI衬底CZTS太阳能电池进行数值计算.对现有的p-CZTS/n-SI太阳能电池的计算... 详细信息

在SI衬底上制备的Cu_(2)ZnSnS_(4)(CZTS)太阳能电池具有CZTS与SI衬底的晶格失配低的优点,但目前其转换效率仍较低.本文采用异质结太阳能电池仿真软件Afors-het对SI衬底CZTS太阳能电池进行数值计算.对现有的p-CZTS/n-SI太阳能电池的计算结果表明,在该电池结构中p-CZTS和n-SI分别起窗口层和吸收层的作用,但p-CZTS具有高光吸收系数,使大部分入射光无法透过p-CZTS层进而被n-SI吸收,限制了电池的转换效率.本文提出以p-SI作为衬底的n-ZnO:Al/i-ZnO/n-CdS/p-CZTS/p-SI太阳能电池结构.计算得到的p-CZTS/p-SI结构的暗态电流密度-电压(J–V)特性曲线均为线性曲线,表明p-CZTS与p-SI为欧姆接触以及p-SI作为p-CZTS的背电极的可行性.进一步计算了p-SI的厚度与掺杂浓度、p-CZTS的厚度与掺杂浓度对n-ZnO:Al/i-ZnO/n-CdS/p-CZTS/p-SI太阳能电池光伏特性的影响,在不考虑寄生串并联电阻效应和缺陷态的理想情况下,电池的最高转换效率为28.41%.本文计算结果表明,n-ZnO:Al/i-ZnO/n-CdS/p-CZTS/p-SI太阳能电池可解决现有p-CZTS/n-SI结构存在的问题,是一种合适的SI衬底CZTS太阳能电池结构.

关键词： Cu_(2)ZnSnS_(4) SI 背电极光伏特性

Exciton polaritons based on planar dielectric SI asymmetric nanogratings coupled with J-aggregated dyes film

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Frontiers of Optoelectronics 2020年第1期13卷 4-11页

作者： Zhen CHAI Xiaoyong HU Qihuang GONG State Key Laboratory for Mesoscopic PhySIcs&Department of PhySIcs Collaborative Innovation Center of Quantum MatterBeijing Academy of Quantum Information SciencesNano-optoelectronics Frontier Center of Ministry of EducationPeking UniversityBeijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Optical cavity polaritons,originated from strong coupling between the excitons in materials and photons in the confined cavities field,have recently emerged as their applications in the high-speed lowpower polaritons devices,low-threshold laSIng and so on.However,the traditional exciton polaritons based on metal plasmonic structures or Fabry-Perot cavities suffer from the disadvantages of large intrinSIc losses or hard to integrate and nanofabricate.This greatly limits the applications of exciton poalritons.Thus,here we implement a compact low-loss dielectric photonic–organic nanostructure by placing a 2-nm-thick PVA doped with TDBC film on top of a planar SI asymmetric nanogratings to reveal the exciton polaritons modes.We find a distinct anti-crosSIng disperSIon behavior appears with a 117.16 meV Rabi splitting when varying the period of SI nanogratings.Polaritons disperSIon and mode anti-crosSIng behaviors are also observed when conSIdering the independence of the height of SI,width of SI nanowire B,and distance between the two SI nanowires in one period.This work offers an opportunity to realize low-loss novel polaritons applications.

关键词： exciton polaritons dielectric SI asymmetric nanogratings TDBC J-aggregated dyes film