CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xuting Li,Zhanghua Fu,Jing Wang,Xinhong Zhao,Yukun Zhang,Weizhe Liu,Qiong Cai,Cheng Hu
The application of Li metal anodes in high energy–density batteries is hindered by the uncontrolled dendrite growth and rapid capacity fading. Herein, we demonstrate that dilithium phthalocyanine (Li 2 Pc) is highly effective for the regulation of ion solvation and transport towards dendrite-free Li metal anodes. The strong interactions of Li 2 Pc with the solvents generate an apparent solvation sheath surrounding the large phthalocyanine ligand, where the dipole–dipole interactions of the solvents are weakened. This promotes the anion solvation in the outer solvation sheath, which suppresses the mobility of the anions for apparently increased Li + transference number and facilitates the dissociation of the solute for a higher ionic conductivity. The resulting uniform Li + flux alleviates the space charge to impede the growth of dendrites. Stable Li plating/stripping of 800 h (1 mA cm −2 , 1 mAh cm −2 ) and dendrite-free Li deposition up to 10 mA cm −2 , 10 mAh cm −2 are achieved in Li/Li cells and the Li/Cu cells exhibit a high average CE of 98.3% over 150 cycles at 1 mA cm −2 , 1 mAh cm −2 . Stable cycling of Li-S full cells at the condition of N:P = 2:1 are also demonstrated with high average CEs of 98.29%.
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
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Wenlong Huang,Yushi Ding,Ying Li,Zezhong Wang
Previously, complex perovskites barium strontium tantalate , i.e., Ba 3 Sr 1.4 T 1.6 O 8.4 (BST40), has exhibited excellent proton conductivity due to its high basicity and oxygen vacancy concentration. Herein, we report proton conduction mechanism of BST40 using brick-layer model and defect equilibria model. Briefly, BST40 is prepared by solid-state synthesis method, resulting in hexagonal perovskite structure with space group of P63/m. Interestingly, grain interior and grain boundary thickness of BST40 are almost equal and the grain boundary conduction mainly dominates the conductivity at T > 500 °C. Total standard molar hydration enthalpy of BST40 and grain interior is found to be −79.6 kJ/mol and −101.3 kJ/mol, respectively. Activation energy for BST40, protons, oxygen-ions, and holes in oxygen-containing humid atmosphere is found to be 0.63 eV, 0.51 eV, 0.92 eV, and 1.08 eV, respectively. These values are higher than corresponding values for the grain interior. At 700 °C, proton transport number of BST40 and grain interior is found to be 0.7 and 0.72, respectively, which is significantly higher than other congeneric complex perovskite-type proton conductors . Overall, these results confirm that BST40 possesses excellent proton conductivity.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zezhong Wang,Ying Li,Wenlong Huang,Yushi Ding
In this work, Ba 3 Ba 1+ x Ta 2- x O 9- δ ( x = 0, 0.1, 0.3, and 0.5) double perovskite proton conductors were prepared by solid-state reaction process. Phase compositions and microstructures were characterized by X-ray diffraction and field emission scanning electron microscope techniques. valence and semi-quantitative composition of components were identified by X-ray photoelectron spectroscopy. Conductivities of Ba 3 Ba 1+ x Ta 2- x O 9- δ were then measured under various vapor and oxygen pressures by AC impedance spectroscopy technique. Results revealed linear increase in total conductivities of Ba 3 Ba 1+ x Ta 2- x O 9- δ oxides as a function of temperature. Ba 3 Ba 1.3 Ta 1.7 O 8.55 exhibited the highest total conductivity of 8.41 × 10 −4 S cm −1 under humidity and 800 °C. The transport numbers calculated by defect equilibria model revealed. Ba 3 Ba 1+ x Ta 2- x O 9-δ oxides as pure proton conductors at 400–800 °C. Also, transport numbers of oxide ions and holes both increased with temperature. Ba 3 Ba 1.3 Ta 1.7 O 8.55 illustrated the highest protonic transport number of 0.60 at 800 °C. In sum, these results suggest that Ba 3 Ba 1+ x Ta 2- x O 9- δ oxides display excellent proton conductivity.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2020
·Vol. 7
·期 15
·3353-3360
·
IF 4.154
Ran Zhang,Zhaoyang Wei,Weiwei Lei,Tao Jiang,Qunchao Zhang,Dean Shi
Graphical Take cover : The shielding effects of ether oxygen atoms in Poly(ethylene glycol) (PEG) molecular chains on the B atoms can be alleviated by introducing siloxane oxygens in between them (B-Si x -PEGs). The deshielding effects of siloxane spacing groups on B atoms increase along with the increase of x in the B-Si x -PEGs polymer electrolytes. Doping boron (B) atoms into poly(ethylene glycol) (PEG)-based solid polymer electrolytes (B-PEG) is believed to be an attractive method to increase the lithium-ion transference number ( ) because of the interaction between the electropositive B atoms and the anions of lithium salts. However, this effect can be largely impeded by the interaction between B and the electronegative ether oxygen atoms in the attached PEG molecular chains, which is referred to as a shielding effect. Enlarging the distance between the center B atoms and the electronegative ether oxygens is believed to be an effective way to reduce such shielding effect. In this work, different number of siloxane spacing groups (Si x ) are introduced in between the B atom and ether oxygen in the B-PEG macromolecules (B-Si x -PEGs x =0,1,3,5). As the siloxane oxygen has less electronegativity to ether oxygen, the shielding effects should be weakened and the ability of B atoms to trap the anions of lithium salt will increase. As the introduction of siloxane groups into the B-Si x -PEGs polymer electrolytes will also reduce the neat contents of both B and PEG, which has the opposite effect on the whole ionic conductivities and values, both the ionic conductivities and values of B-Si x -PEGs electrolytes first increase then decrease along with x increases from 0 to 5 when the [Li + ]:[EO] mole ratio is fixed at 1 : 10. The peak value exists at x =1. Meanwhile, both the mobilities of Li + ions (confirmed via 7 Li nuclear magnetic resonance (NMR) results) and bis(trifluoromethane) sulfonimide (TFSI − ) anions (confirmed from Raman spectra analysis) get their maximum values when x =1. However, if both the concentrations of TFSI − and B atoms in B-Si x -PEGs electrolytes are taken into consideration, the normalized diffusion coefficient of TFSI − anions obtained by molecular dynamic (MD) simulation decrease monotonically when x increases from 0 to 5. As the diffusion coefficient of TFSI − anions is determined by the interaction probability and strength of TFSI − and B atoms; these results confirm that the interaction between the B atoms and TFSI − anions increase with x . Namely, the deshielding effects of siloxane spacing groups on B atoms increase along with the increase of x in the B-Si x -PEGs polymer electrolytes, while it levels off when x exceeds 3.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 32
·2203336
·
IF 19.924
Yuzhen Hu,Linge Li,Haifeng Tu,Xiaohong Yi,Jian Wang,Jingjing Xu,Wenbin Gong,Hongzhen Lin,Xiaodong Wu,Meinan Liu
Solid-state lithium-metal batteries attract great attention due to their high energy density and superior safety. However, the sluggish Li + kinetics of solid electrolyte and poor interface compatibility between electrolyte and lithium anode lead to unsatisfied performance at room temperature, which severely limit their practical application. Herein, a Janus quasi-solid electrolyte (JSE) design is reported, which modifies the Li + solvation environment in succinonitrile (SN) plastic crystal electrolyte and creates 1D Li + transportation channels. Density functional theory calculations and Raman results reveal that Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 changes the Li + solvation environment from SN units to aggregated ion pairs, which accelerates the diffusion rate of Li + . As a result, JSE presents excellent ionic conductivity (0.73 mS cm −1 ) and high lithium transference number (0.72). With this efficient JSE, Li symmetric cells deliver excellent cycle stability over 600 h with a low over potential of 60 mV. LiFePO 4 |JSE|Li solid-state battery delivers an impressive performance with a specific discharge capacity of 152 mAh g −1 after 100 cycles at room temperature under 0.5 C. Moreover, the corresponding pouch cell also shows outstanding performance (140 mAh g −1 under 0.5 C) and withstands abuse tests such as bending and cutting, demonstrating its superior safety for future utilization.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SOLID STATE IONICS
·
2024
·
IF 3
Hai Yan Xu,Guang Tao Fei,Shao Hui Xu,Wen Chao Chen,Shi Jia Li,Xin Feng Li,Hao Miao Ouyang
The separator is crucial to the performance and safety of the battery. This study prepared a polypropylene (PP) /solid electrolyte Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) /SiO 2 composite separator (PP/LATP/SiO 2 ). The experimental results demonstrate significant enhancements in the electrolyte wettability and thermal stability of the separator. Furthermore, the lithium-ion transference number ( t + ) has been raised from 0.22 to 0.56. In electrochemical performance tests, the lithium symmetric battery assembled with the PP/LATP/SiO 2 composite separator exhibits an exceptionally long cycle life, sustaining stable cycling for 900 h at a current density of 0.5 mA cm −2 . This composite separator, combining the solid electrolyte and SiO 2 layer, effectively facilitates lithium-ion transport and reduces the occurrence of electrode side reactions, thereby enhancing the performance and safety of the battery.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2020
·Vol. 8
·期 5
·1901429
·
IF 3.404
Qingtong Wang,Jian Yang,Zhuyi Wang,Liyi Shi,Yin Zhao,Shuai Yuan
Herein, the polyethylene (PE) separators are coated by micro/nanoalumina particles. The alumina particles with different sizes play different roles. The microalumina mainly enhances the thermal stability of the polyolefin separator and provides large channels for lithium-ion diffusion. The nanoalumina particles are helpful in improving the lithium-ion transference number by increasing the contact interface area of electrolyte/alumina. The lithium-ion transference number of the separators with different coatings increases from 0.32 to 0.40, mainly due to the ratio of micro/nanoalumina particles. Meanwhile, ion conductivity increases from 0.30 to 0.40 mS cm −1 . As a result, the cycling stability of the lithium metal anode is greatly improved by the synergetic effect of microsized alumina particles and nanosized alumina particles.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2024
·
IF 3
Jianling Tian,Ruiyang Li,Xueying Yang,Pengbin Lai,Jiaxiang Liu,Ruilai Ye,Yi Deng,Qichen Chen,Peng Zhang,Jinbao Zhao
Polyethylene oxide (PEO) is considered as the most promising and widely studies polymer matrix . However, its practical application is limited for its low ionic conductivity at room temperature . Here, a novel fluorinated branched (2,2,2-Trifluoroethyl methacrylate (TFEMA)) ether polymer (PFP) was synthesized through thiol-Michael addition click reaction and blended with PEO to obtained PEO-based polymer electrolyte . The introduction of PFP could reduce the crystallinity and hinder the migration of anions, resulting in a double increase in ionic conductivity and lithium-ion transference number. More importantly, the symmetric Li/Li employing blended polymer shows stable cycle more than 1700 h and the Li/LiFePO 4 cell shows the superior performance of both cycling and rating at 60 °C. Even at lower temperature (28 °C), the Li/LiFePO 4 cell exhibits encouraging cycling performance with 88.6% capacity retention at 0.2C after 100 cycles. This study provides a novel strategy for structural design and synthesis progress of solid polymer electrolyte .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Zhenyuan Hu,Yaying Wang,Shikang Huo,Wei Bao,Weizhen Fan,Yi Zhang,Xiao Jing,Niaz Ahmad,Hansong Cheng,Yunfeng Zhang
Gel polymer electrolytes (GPEs) are highly worthwhile for constructing high-energy-density lithium metal batteries (LMBs) because of their good flexibility and manufacturability. But, it is still challenging to prepare GPEs with excellent electrochemical performance, good flame retardancy, and good compatibility with electrodes for safe and dendrite-free LMBs application. Herein, a well-designed GPE with three-dimensional (3D) crosslinking network containing –C N and -PO(OC 2 H 5 ) 2 functional groups ( 3D -ADCL) with synergistic effect is prepared via thermal-initiated in-situ polymerization. Concretely, the -PO(OC 2 H 5 ) 2 segment enhances the flame resistance of polymer electrolyte, and the –C N segment grants improved Li-ion conductivity. In addition, the 3D crosslinking networks in the whole LMBs are incredibly favorable for improving the physical stability of both polymer electrolyte membrane/electrode bulks and electrolyte/electrode interface. Furthermore, the 3D -ADCL-based polymer electrolyte ( 3D -ADCL-PE) demonstrates an enhanced Li-ion transference number ( t L i + ) of 0.58 because the –C N groups possess strong coordination with Li-ion and electrostatic repulsion with PF 6 − anion. It is also confirmed that the –C N group can enable the formation of stable Li 3 N-rich solid electrolyte interphase (SEI) and high-quality cathode electrolyte interphase (CEI) layers to inhibit Li dendrite growth and stabilize the LiFePO 4 cathode, respectively. Consequently, the 3D -ADCL-PE based LiFePO 4 /Li cells exhibit a remarkable capacity of 106.4 mA h g −1 at 6 C-rate with a high capacity retention of 90.3% after long 1000 cycles.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Ce Xuan,Shuyu Gao,Yanqing Wang,Qingliang You,Xueqing Liu,Jiyan Liu,Rui Xu,Kun Yang,Shaokai Cheng,Zhihong Liu,Qingzhong Guo
A kind of high performance thiol-conjugated solid polymer electrolytes is in situ generated via a facile thiol-acrylate Michael addition reaction between ethylene glycol dimethacrylate (EGDMA) and 3,6-dioxa-1,8-octane dithiol (DODT) without UV irradiation or thermal initiation. The resulting amorphous linear polymer P(EGDMA-DODT) has a high average molecular weight of 47,000 Da with a low glass transition temperature of −50 °C. The in-situ generated P(EGDMA-DODT) solid polymer electrolyte exhibits room temperature ionic conductivity up to 2.7 × 10 −5 S cm −1 with a high lithium ion transference number above 0.40 and electrochemical stability window up to 4.3 V vs. Li/Li + . Advantages of longer C–S bond length (1.81 Å), lower electronegativity (2.58) and moderate coordination facilitate the segment motion and contribute to higher room temperature ionic conductivity . It is demonstrated that the all-solid-state LiFePO 4 /Li cells using the in-situ generated P(EGDMA-DODT) electrolytes delivers considerable specific capacities, rate capability and excellent cyclic performance at room temperature. These results demonstrate that this thiol-acrylate click chemistry without UV irradiation or thermal initiation is a facile and intriguing strategy for in-situ preparing high performance solid polymer electrolytes .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·Vol. 43
·期 1
·177-187
·
IF 4.1
Wu Hao-Min,Ma Wen-Can,Cai Yi-Feng,Huang Xin,Li Jun-Heng,Kai Xi,Zhang Qiu-Hong,Jia Xu-Dong
Solid-state electrolytes are considered to be the vital part of the next-generation solid-state batteries (SSBs), due to their high safety and long operation life span. However, the two major factors that impede the expected performance of batteries are: the easy formation of lithium dendrites due to the concentration gradient of anions, and the low ionic conductivity at room temperature, which prevents reaching ideal electrochemical performance. Single-ion quasi-solid-state electrolytes (SIQSSEs) could provide higher safety and energy density, owing to absence of anion concentration gradient and solvent, as well as good lithium-ion transport ability. The porous covalent organic frameworks (COFs) are beneficial for con-structing appropriate lithium-ion transport pathway, due to the ordered 1D channel. In addition, the boroxine COFs (COF-5) offers strong ability of withdrawing anion part of lithium salt. Last but not the least, boron atom could play the role of coordinate site due to its electron deficiency. These advantages afford an opportunity to obtain a SIQSSE with high ionic conductivity and high lithium transference number (LTN) simultaneously. The COF-5 based SIQSSEs delivered a high ionic conductivity of 6.3×10 −4 S·cm −1 , with a high LTN of 0.92 and a wide electrochemical stable window (ESW) of 4.7 V at room temperature. The LiFePO 4 (LFP)/Li cells, which was assembled with COF-5 based SIQSSE, exhibited outstanding long cycle stability, high initial capacity and favorable rate performance. The results indicated COFs could be an ideal material for single-ion solid-state electrolytes in next-generation batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Weisheng He,Zili Cui,Xiaochen Liu,Yanyan Cui,Jingchao Chai,Xinhong Zhou,Zhihong Liu,Guanglei Cui
The classic poly(ethylene oxide) (PEO) based solid polymer electrolyte suffers from poor ionic conductivity of ambient temperature, low lithium ion transference number and relatively narrow electrochemical window (<4.0 V vs. Li + /Li). Herein, the carbonate-linked PEO solid polymer such as poly(diethylene glycol carbonate) (PDEC) and poly(triethylene glycol carbonate) (PTEC) were explored to find out the feasibility of resolving above issues. It was proven that the optimized ionic conductivity of PTEC based electrolyte reached up to 1.12 × 10 −5 S cm −1 at 25 °C with a decent lithium ion transference number of 0.39 and a wide electrochemical window about 4.5 V vs. Li + /Li. In addition, the PTEC based Li/LiFePO 4 cell could be reversibly charged and discharged at 0.05 C -rates at ambient temperature. Moreover, the higher voltage Li/LiFe 0.2 Mn 0.8 PO 4 cell (cutoff voltage 4.35 V) possessed considerable rate capability and excellent cycling performance even at ambient temperature. Therefore, these carbonate-linked PEO electrolytes were demonstrated to be fascinating candidates for the next generation solid state lithium batteries simultaneously with high energy and high safety.
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
危险品化学品经营许可证（带存储）