JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Xuelian Fu,Chaoqun Shang,Mingyang Yang,Eser Metin Akinoglu,Xin Wang,Guofu Zhou
Li metal anode is promising materials for high-energy-density Li metal batteries (LMBs) due to its large theoretical specific capacity and negative reduction potential. However, the poor safety and insufficient cyclability caused by the dendritic Li growth hinder the commercialization of LMBs. To alleviate the formation of Li dendrites and further improve the cycling stability of LMBs, an ion-conductive polyacrylonitrile (PAN)-based hybrid separator is proposed. The hybrid separator is composed of flexible PAN and high ionic conductive W-doped Li 6·3 La 3 Zr 1·65 W 0·35 O 12 (LLZWO) as the function of physical blocking to realize the Li dendrite-free. As a result, the hybrid separator with 20 wt% LLZWO (PLL-20) shows high ionic conductivity (6.89 × 10 −5 S cm −1 ) and high Li-ion transference number (0.58). The Li|PLL-20|Li symmetric cells exhibit long-term stability without Li dendrite growth at 0.2 mA cm −2 for over 350 h. Furthermore, the Li|PLL-20|LiFePO 4 battery delivers a high discharge specific capacity of 138.2 mAh g −1 at 0.2C under ambient conditions. This work highlights the ability of hybrid functional separators to protect Li metal anode in high-energy-density LMBs.
研究领域:
材料科学
·
能源存储
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高影响因子
Scientific Reports
·
2025
·Vol. 15
·期 1
·1-16
·
IF 3.9
Logrado Millena,Gaddam Anuraag,Zhuo Fangping,Zhao Changhao,Gao Shuang,Breitzke Hergen,Rosenstihl Markus,Vogel Michael,Rödel Jürgen,Buntkowsky Gerd
Thermal treatments play a crucial role in tuning the functional properties of lithium-based perovskites, which are of interest for applications in energy storage, actuation and sensing. In the present work, the impact of aging and quenching on the local structure and lithium mobility in lithium sodium niobate (LNN) ceramics was investigated using Density Functional Theory (DFT), transmission electron microscopy (TEM) and solid-state Nuclear Magnetic Resonance (NMR) techniques. Our results demonstrate that quenching inhibits the formation of a lithium-rich phase, leading to significant modifications in dipolar and quadrupolar interactions. Aging induces the formation of LiNbO 3 within the perovskite matrix, with no indication of lithium mobility at the boundaries of LiNbO 3 grains. The presence of multiple lithium environments in aged samples was indicated by transmission electron microscopy and confirmed through 7 Li Magic Angle Spinning (MAS) NMR, revealing distinct structural differences between aged and unaged samples. NMR parameters were also compared with parameters calculated by Density Functional Theory. The findings suggest the formation of LiNbO 3 and an additional lithium poor phase in aged LNN samples. These results indicate that the quenching effect reduces dipolar interactions and considerably sharpens the 7 Li NMR spectra, while structural modifications induced by thermal processing affect lithium ordering, providing new insights into the phase behavior of LNN ceramics.
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高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2018
·
IF 4.66
Fanyu Kong,Xiaodong He,Qianqian Liu,Xinxin Qi,Dongdong Sun,Yongting Zheng,Rongguo Wang,Yuelei Bai
The Si@Ti 3 C 2 MXene nanocomposite was prepared in this paper by simply ultrasonic mixing of commercially available nanosized Si and Ti 3 C 2 MXene. The introduction of Ti 3 C 2 makes the aggregation of silicon nanoparticles relieved. Electrochemical measurements show that the nanocomposite maintains a reversible capacity of 188 mAh·g −1 at 0.2 A·g −1 after 150 cycles and exhibits improved capacity retention, which are significantly better than those of pure Si. The enhanced cycling stability and rate capability are attributed to the good electrical connection between silicon and Ti 3 C 2 . This study provides a new available matrix and guidance for the applications of MXenes in Si-based anode LIBs.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
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高影响因子
Energy Storage Materials
·
2020
·
IF 16.28
Qingfeng Fu,Xiangzhen Zhu,Renjie Li,Guisheng Liang,Lijie Luo,Yongjun Chen,Yuanli Ding,Chunfu Lin,Kuikui Wang,Xiu Song Zhao
M–Nb–O compounds are regarded as advanced anode materials of lithium-ion batteries owing to their large capacities, high safety and fast Li + transport. However, challenges remain in the exploitation of new M–Nb–O compounds with low strains to enable superior cyclability. Here, we exploit V 3 Nb 17 O 50 as a low-strain M–Nb–O anode compound, and V 3 Nb 17 O 50 micron-sized particles (V 3 Nb 17 O 50 -MP) and submicron-sized rods (V 3 Nb 17 O 50 -SR) are demonstrated. V 3 Nb 17 O 50 owns an open and robust shear ReO 3 crystal structure, which is constructed by 3 × 3 × ∞ (V,Nb)O 6 octahedron-blocks linked by VO 4 tetrahedra. The resulting A–B–A layered structure with a large interlayer spacing enables the superior Li + diffusivity and significant intercalation-pseudocapacitive behavior in V 3 Nb 17 O 50 . The maximum unit-cell volume expansion of V 3 Nb 17 O 50 discharged to 0.8 V is only 3.46% (the smallest value among the known M–Nb–O anode compounds with shear ReO 3 structures), leading to the excellent cyclability of V 3 Nb 17 O 50 -MP/V 3 Nb 17 O 50 -SR with 90.0/91.8% capacity retention over 2000 cycles at 10C. V 3 Nb 17 O 50 -MP/V 3 Nb 17 O 50 -SR further exhibits a safe operating potential of 1.736/1.724 V, large reversible capacity of 207/254 mA h g −1 at 0.1C, and high rate performance with 68/123 mA h g −1 at 10C. A LiMn 2 O 4 //V 3 Nb 17 O 50 -SR full cell also exhibits comprehensively good electrochemical properties , including excellent cyclability with 85.7% capacity retention over 500 cycles at 5C. Therefore, V 3 Nb 17 O 50 can be a very promising anode compound for stable, safe, large-capacity and fast-charging Li + storage.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米结构材料
·
固态化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaoyu Zhao,Shuixin Xia,Xun Zhang,Yuepeng Pang,Fen Xu,Junhe Yang,Lixian Sun,Shiyou Zheng
Lithium (Li) metal is regarded as one of the most prospective electrodes for next-generation rechargeable batteries. However, its widespread usage has been fettered by low coulombic efficiency (CE), poor cycling stability, and serious safety concerns, mainly arising from huge volumetric variation, inhomogeneous Li deposition, and dendrite growth during repeated Li plating/stripping cycles. Herein, we propose a facile one-pot electrospinning-derived highly lithiophilic nanocopper-reinforced three-dimensional-structured carbon nanofiber (Cu-CNF) as functional scaffold to stabilize the Li metal. The Cu-CNF scaffolded Li metal demonstrates homogeneous nanoplate-like Li deposition, enhanced CE, and ultrastable long lifespan cycling. As coupled with LiNi0.8Co0.1Mn0.1O2 (NCM811), the cell possesses a remarkably stable high capacity retention of 93% over 300 cycles at 0.2 C. Furthermore, the cells paired with a thick LiFePO4 (LFP) electrode (∼12 mg cm–2) still can deliver a superior cycling performance even under the harsh conditions of an extremely low negative/positive electrode capacity (N/P) ratio (∼1.5) and lean electrolyte. Density functional theory calculations are performed to disclose the mechanism of the enhanced electrochemical performance of Cu-CNF scaffolded Li. This work provides a handy and cost-effective method to design superior performance Li metal anodes for practical applications.
研究领域:
材料科学
·
能源存储
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高影响因子
Nanoscale
·
2016
·Vol. 8
·期 46
·19263-19269
·
IF 7.76
Pengfei Zhou,Zhen Zhang,Huanju Meng,Yanying Lu,Jun Cao,Fangyi Cheng,Zhanliang Tao,Jun Chen
We reported a one-step dry coating of amorphous SiO2 on spherical Ni-rich layered LiNi0.915Co0.075Al0.01O2 (NCA) cathode materials. Combined characterization of XRD, EDS mapping, and TEM indicates that a SiO2 layer with an average thickness of ∼50 nm was uniformly coated on the surface of NCA microspheres, without inducing any change of the phase structure and morphology. Electrochemical tests show that the 0.2 wt% SiO2-coated NCA material exhibits enhanced cyclability and rate properties, combining with better thermal stability compared with those of pristine NCA. For example, 0.2 wt% SiO2-coated NCA delivers a high specific capacity of 181.3 mA h g−1 with a capacity retention of 90.7% after 50 cycles at 1 C rate and 25 °C. Moreover, the capacity retention of this composite at 60 °C is 12.5% higher than that of pristine NCA at 1 C rate after 50 cycles. The effects of SiO2 coating on the electrochemical performance of NCA are investigated by EIS, CV, and DSC tests, the improved performance is attributed to the surface coating layer of amorphous SiO2, which effectively suppresses side reactions between NCA and electrolytes, decreases the SEI layer resistance, and retards the growth of charge-transfer resistance, thus enhancing structural and cycling stability of NCA.
研究领域:
材料科学
·
电化学
·
储能
·
电池技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jun Pan,Pei Zhao,Heliang Yao,Lulu Hu,Hong Jin Fan
The main role of inert fillers in polymer electrolytes is to enhance ionic conductivity. However, lithium ions in gel polymer electrolytes (GPEs) conduct in liquid solvent rather than along the polymer chains. So far, the main role of inert fillers in improving the electrochemical performance of GPEs is still unclear. Here, various low-cost and common inert fillers (Al2O3, SiO2, TiO2, ZrO2) are introduced into GPEs to study their effects on Li-ion polymer batteries. It is found that the addition of inert fillers has different effects on ionic conductivity, mechanical strength, thermal stability, and, dominantly, interfacial properties. Compared with other gel electrolytes containing SiO2, TiO2, or ZrO2 fillers, those with Al2O3 fillers exhibit the most favorable performance. The high performance is ascribed to the interaction between the surface functional groups of Al2O3 and LiNi0.8Co0.1Mn0.1O2, which alleviates the decomposition of the organic solvent by the cathode, resulting in the formation of a high-quality Li+ conductor interfacial layer. This study provides an important reference for the selection of fillers in GPEs, surface modification of separators, and cathode surface coating.
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PubMed
高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 34
·期 43
·2206020
·
IF 32.086
Chuangchao Sun,Xiao Ji,Suting Weng,Ruhong Li,Xiaoteng Huang,Chunnan Zhu,Xuezhang Xiao,Tao Deng,Liwu Fan,Lixin Chen,Xuefeng Wang,Chunsheng Wang,Xiulin Fan
Li-ion batteries have made inroads into the electric vehicle market with high energy densities, yet they still suffer from slow kinetics limited by the graphite anode. Here, electrolytes enabling extreme fast charging (XFC) of a microsized graphite anode without Li plating are designed. Comprehensive characterization and simulations on the diffusion of Li + in the bulk electrolyte, charge-transfer process, and the solid electrolyte interphase (SEI) demonstrate that high ionic conductivity, low desolvation energy of Li + , and protective SEI are essential for XFC. Based on the criterion, two fast-charging electrolytes are designed: low-voltage 1.8 m LiFSI in 1,3-dioxolane (for LiFePO 4 ||graphite cells) and high-voltage 1.0 m LiPF 6 in a mixture of 4-fluoroethylene carbonate and acetonitrile (7:3 by vol) (for LiNi 0.8 Co 0.1 Mn 0.1 O 2 ||graphite cells). The former electrolyte enables the graphite electrode to achieve 180 mAh g −1 at 50C (1C = 370 mAh g −1 ), which is 10 times higher than that of a conventional electrolyte. The latter electrolyte enables LiNi 0.8 Co 0.1 Mn 0.1 O 2 ||graphite cells (2 mAh cm −2 , N/P ratio = 1) to provide a record-breaking reversible capacity of 170 mAh g −1 at 4C charge and 0.3C discharge. This work unveils the key mechanisms for XFC and provides instructive electrolyte design principles for practical fast-charging LIBs with graphite anodes.
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高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-14
·
IF 16.6
Zhang Junbo,Zhang Haikuo,Weng Suting,Li Ruhong,Lu Di,Deng Tao,Zhang Shuoqing,Lv Ling,Qi Jiacheng,Xiao Xuezhang,Fan Liwu,Geng Shujiang,Wang Fuhui,Chen Lixin,Noked Malachi,Wang Xuefeng,Fan Xiulin
Elevating the charging cut-off voltage is one of the efficient approaches to boost the energy density of Li-ion batteries (LIBs). However, this method is limited by the occurrence of severe parasitic reactions at the electrolyte/electrode interfaces. Herein, to address this issue, we design a non-flammable fluorinated sulfonate electrolyte by multifunctional solvent molecule design, which enables the formation of an inorganic-rich cathode electrolyte interphase (CEI) on high-voltage cathodes and a hybrid organic/inorganic solid electrolyte interphase (SEI) on the graphite anode. The electrolyte, consisting of 1.9 M LiFSI in a 1:2 v / v mixture of 2,2,2-trifluoroethyl trifluoromethanesulfonate and 2,2,2-trifluoroethyl methanesulfonate, endows 4.55 V-charged graphite||LiCoO 2 and 4.6 V-charged graphite||NCM811 batteries with capacity retentions of 89% over 5329 cycles and 85% over 2002 cycles, respectively, thus resulting in energy density increases of 33% and 16% compared to those charged to 4.3 V. This work demonstrates a practical strategy for upgrading the commercial LIBs.
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高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2021
·
IF 4.724
Liang Zhu,Yingbing Zhang,Xiaoyu Zhao,Yaoxin Jiao,Zijian Zhao,Yanfei Wang,Nianjun Yang
LiMn 2 O 4 (LMO) is a promising cathode material for the assembly of lithium ion batteries in that it satisfies the requirement for a high specific capacity, but it lacks structural stability during long-term cycling. To overcome this challenge, Al 2 O 3 and PPy are coated onto LiMn 2 O 4 (PPy/Al 2 O 3 /LMO) using a sol–gel method followed by oxidative chemical polymerization. The discharge capacity of PPy/Al 2 O 3 /LMO reaches 121.73 mAh g −1 at a rate of 1C. The retention is as high as 95.81% even after 100 charge/discharge cycles. The enhanced performance of PPy/Al 2 O 3 /LMO for Li ion storage results from improved electron conductivity, a more rapid ion migration rate, and reduced Mn ion dissolution. This strategy could be further utilized for the synthesis of other cathode materials for use in lithium ion batteries.
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高影响因子
Energy Storage Materials
·
2021
·
IF 17.789
Zhong Fang,Yang Yang,Tianle Zheng,Nan Wang,Congxiao Wang,Xiaoli Dong,Yonggang Wang,Yongyao Xia
High-energy-density CF x /Li batteries have attracted wide applications, but encountered poor environmental adaptability at high/low temperatures. Guided with unique electrolyte-involved reaction mechanism, propylene carbonate (PC)/methyl butyrate (MB) co-solvent formulation was optimized to tune the desolvation barrier and stability for wide temperature operation. Weak affinity of Li + -MB and unique solvation structure of electrolyte, which facilitated easy desolvation at both high rate and low temperature, were uncovered with theoretical calculations and spectra characterizations. Desolvation process from intermediate and percolation-type reaction were clearly revealed with in-situ FT-IR and ex-situ TEM. The synergistic effect of handy desolvation with fast kinetics at the interface enabled excellent rate performance (1C, 834 mAh g −1 ) at +25°C and high capacity (240 mAh g −1 ) at low temperature of -70°C. Simultaneously, the stability of electrolyte assisted to realize high-temperature tolerance up to +95°C. The mechanism-guided electrolyte design offers deep understanding and novel strategy to improve CF x /Li batteries for wide temperature applications.
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高影响因子
JOM
·
2020
·Vol. 72
·期 8
·3003-3010
·
IF 2.054
Zou Jingyi,Sun Xiaogang,Li Rui,He Qiang
The electrochemical performance of fluorinated multiwalled carbon nanotubes (F-MWCNTs) as a new type of conductive agent for Li–SnO 2 batteries has been studied. Multiwalled carbon nanotubes (MWCNTs) were fluorinated to obtain F-MWCNTs with core–shell structure (fluorocarbon atomic ratio C/F = 1:1). The unique tubular structure of the F-MWCNTs allows more Li + ions and electrons to enter the channel around the active material CF 1 , which increases the electrochemical reaction effect and reduces the polarization effect of the batteries, thereby improving the utilization of the active material, and the capacity as well as the stability of the discharge plateau of the resulting batteries. The F-MWCNTs are an excellent alternative to the traditional conductive graphite. The SnO 2 @F-MWCNTs battery showed high specific capacity (1588.71 mAh g −1 at 100 mA g −1 ), excellent cycle performance (962.92 mAh g −1 after 100 cycles), excellent coulombic efficiency (99.89%), and low internal resistance in repeated electrochemical tests.
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高影响因子
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