CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhengren Tao,Fangrui Cheng,Yinghan Wang,Sijie Su,Enhai Song,Jiulin Gan,Shi Ye
The arrangement of lithium and niobium in the LiNbO 3 lattice is crucial to its notable ferroelectric, piezoelectric, ion conductive, and nonlinear optical properties. However, the synthesis of Li concentration-gradient nanocrystals remains a significant challenge. In this paper, we report a reliable method for synthesizing LiNbO 3 : Yb/Er nanocrystals with a Li-gradient through topochemical molten salt synthesis. We elucidate the Li-gradient characteristics using various analytical techniques, including depth-dependent elemental analysis. Variable-temperature upconversion luminescence spectroscopy provided insights into thermally induced surface and interior Li + diffusion. Our findings demonstrate that Li-gradient nanocrystals exhibit enhanced ferroelectric behavior and increased sensitivity to mechanical force in upconversion emission response. This study proposes a feasible universal strategy for synthesizing alkali metal niobate materials with controlled polarization, offering promising candidates for flexible, low-power optoelectronic devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shuzhang Niu,Si-Wei Zhang,Donyang Li,Xin Wang,Xiaomei Chen,Run Shi,Nan Shen,Mengtian Jin,Xian Zhang,Qing Lian,Runqing Huang,Abbas Amini,Yusheng Zhao,Chun Cheng
Constructing a multi-functionally artificial interphase layer is an emerging strategy to possibly address the issues of inhomogeneous Lithium (Li) nucleation and dendrite growth. In this study, a silver@fullerene (Ag@C 60 ) interphase layer with lithiophilic-lithiophobic gradient was designed, which was fabricated by series of deposition of silver and fullerene (Ag@C 60 ) on Cu foam current collector (ACCF). In this way, the typically uncontrolled Li deposition process will become a highly nucleation-guided process, due to the preferentially induced Li nucleation of Ag nanoparticles, which will guide the Li deposition sandwiched in C 60 and Ag layers. While the top lithiophobic fullerene layer is beneficial for regulating uniform Li-ion flux and facilitating the formation of LiF-rich SEI layer, finally suppressing the top deposition of Li metal, due to the high nucleation energy barrier on fullerene. Consequently, Li@ACCF exhibits a low overpotential of 14 mV and an ultra-stable cyclic life for more than 2500 h in symmetric cells. Besides, it also displays excellent long-term cycle life and high-rate performance in lithium-metal full cells. This deliberate design of the “push–pull” Li could ensure the uniform Li deposition sandwiched fullerene and silver layers and provide a feasible and efficient approach to advance the practical use of lithium-metal anodes for high-energy–density batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
界面工程
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Jiahui Zhou,Feng Wu,Guangling Wei,Yutong Hao,Yang Mei,Li Li,Man Xie,Renjie Chen
Metallic lithium (Li) is a promising anode candidate for high-energy-density Li batteries . The problems of dendrite growth and volume expansion caused by Li metal cycling can be suppressed by the introduction of a 3D conductive skeleton. However, as the cycle progresses, the Li metal deposits on the upper surface of the skeleton structure, making the host ineffective. Herein, a 3D porous host is designed comprising ZnO nanoparticles having lithiophilic gradients assemble on an interconnected 3D carbon nanotube/graphene skeleton. The 3D porous carbon nanotube/graphene structure exhibits excellent conductivity and a large specific surface area, which reduces the local current density and provides ample space for Li deposition. More importantly, the lithiophilic gradient ZnO nanoparticles anchored on the graphene sheets enable hierarchical induction of Li-ion nucleation and guide Li deposition into the host, preventing preferential deposition at the top surface of the host even during prolonged Li stripping/plating. The host delivers a high Coulombic efficiency of up to 98.2% for at least 500 cycles, and the symmetrical cell comprising the host operates smoothly for >920 h (<20 mV). The as-prepared full cell, paired with a LiFePO 4 cathode, exhibits an excellent rate capability and flat surface morphology.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
·
表面工程
·
固态离子学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2018
·Vol. 9
·期 1
·1-11
·
IF 12.353
Zhang Huimin,Liao Xiaobin,Guan Yuepeng,Xiang Yu,Li Meng,Zhang Wenfeng,Zhu Xiayu,Ming Hai,Lu Lin,Qiu Jingyi,Huang Yaqin,Cao Gaoping,Yang Yusheng,Mai Liqiang,Zhao Yan,Zhang Hao
The long-standing issue of lithium dendrite growth during repeated deposition or dissolution processes hinders the practical use of lithium-metal anodes for high-energy density batteries. Here, we demonstrate a promising lithiophilic–lithiophobic gradient interfacial layer strategy in which the bottom lithiophilic zinc oxide/carbon nanotube sublayer tightly anchors the whole layer onto the lithium foil, facilitating the formation of a stable solid electrolyte interphase, and prevents the formation of an intermediate mossy lithium corrosion layer. Together with the top lithiophobic carbon nanotube sublayer, this gradient interfacial layer can effectively suppress dendrite growth and ensure ultralong-term stable lithium stripping/plating. This strategy is further demonstrated to provide substantially improved cycle performance in copper current collector, 10 cm 2 pouch cell and lithium–sulfur batteries, which, coupled with a simple fabrication process and wide applicability in various materials for lithium-metal protection, makes the lithiophilic–lithiophobic gradient interfacial layer a favored strategy for next-generation lithium-metal batteries.
研究领域:
材料科学
·
电化学
·
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）