Materials Today Communications
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2023
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IF 3.8
Shi Qiu,Fengdong Sun,Chen You,Chaokun Tang,Baoli Zhou,Shuquan Zhang,Jiangtao Feng,Aixian Tian,Minfang Chen
Through preparing the porous Zn-0.8Li scaffolds with 50–70 % porosity by using NaCl particles as pore-forming agents in the range of 150–350 µm and 350–550 µm with the infiltration casting method, the present study investigated the pore structure , mechanical properties and weight loss in simulated body fluids (SBF), and conducted the cellular activity and in vivo degradation experiments on porous Zn-0.8Li scaffolds before and after chitosan coating treatment. The results showed that the porous samples with small pore size had higher mechanical properties and lower degradation rate. However, with relatively higher average porosity and through-porosity, the porous samples with large pore size showed better pore connectivity, which provided channels for nutrient transport and promoted the lateral growth of internal tissues. In terms of cell experiments, chitosan coated Zn-0.8Li scaffolds with large pore size had better cell activity and adhesion. Since the coating of chitosan inhibited the release of Zn 2+ during the implantation of porous Zn-0.8Li scaffolds in vivo, it effectively promoted the growth of new bone tissue around the porous scaffolds, which provided an ideal microenvironment for the adhesion, proliferation and differentiation of MSCS. The results of this study demonstrated the great potential of chitosan coated porous biodegradable Zn-based scaffolds for bone tissue engineering.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Jiahao Zu,Weitao Jing,Xin Dai,Zheng Feng,Junjie Sun,Qiang Tan,Yuanzhen Chen,Yongning Liu
Lithium-sulfur (Li-S) batteries have attracted enormous attentions as new-generation energy storage devices due to their high theoretical energy density , high theoretical specific capacity, low cost and environmental friendliness. However, polysulfide shuttle and the growth of lithium dendrites significantly restrain the practical application of the Li-S batteries. In this work, a modified PP separator with nanoscale rod-like α-MnO 2 supported on carbon nanotubes was prepared. The α-MnO 2 @CNT modified separator can effectively inhibit the shuttle of polysulfide , enhance the electrochemical activity and accelerate the transfer of ions and electrons. The density functional theory (DFT) calculations demonstrate that α-MnO 2 @CNT can efficiently adsorb and catalyze the conversion of polysulfides. Due to these advantages, the α-MnO 2 @CNT-based Li-S battery delivers a initial discharge capacity of 1469 mAh g −1 at 0.05 C, 1039 mAh g −1 at 0.5 C and the capacity can still maintain 648 mAh g −1 over 500 cycles at 0.5 C (capacity decay rate of 0.075%). Expressly, the capacity decay rate is only 0.022% after 600 cycles at a high current density of 2 C. The excellent performance could be attributed to the α-MnO 2 @CNT modified separator not only accelerating the transmission of electrons but also effectively inhibiting the shuttle of polysulfides. Moreover, this work provides a better idea for practical applications of lithium-sulfur batteries in the future.
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Materials Chemistry Frontiers
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2023
·Vol. 7
·期 6
·1072-1081
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IF 7
Yanan Zhu,Yuanfu Deng,Guohua Chen
Carbon materials with large exposed surfaces and heteroatom doping have great potential in suppressing the shuttle effect in Li–S batteries. In this study, crosslinked triazine frameworks were successfully utilized to synthesize heteroatom-doped carbon nanosheets utilizing g-C3N4 nanosheets as the hard template and porogen. Characterization studies show that the nanosheets were highly crinkled and interconnected with a large surface area (1060 m2 g−1) and pore volume (2.14 cm3 g−1), and with highly dispersed N, O and S. After coating them on commercial Celgard separators, batteries with the modified separators showed a low self-discharge and an improved rate performance even at 4 C. At 0.5 C, the initial discharge capacity was 1240 mA h g−1 with a capacity decay of 0.059% per cycle for over 1000 cycles. Moreover, excellent cycling performances at 2 C for 500 cycles were also achieved. The excellent performance can be attributed to the large surface area and porous structure of NOS-C, the superior wettability toward the electrolyte, enhanced Li+ diffusion, strong interactions between polysulfides and doped atoms, and the accelerated redox kinetics of polysulfides.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2023
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IF 4
Yitong Guo,Darong Liu,Bowen Huang,Libo Wang,Qixun Xia,Aiguo Zhou
In this study, highly pure Mo 2 CT x MXene was made from Mo 2 Ga 2 C by hydrothermal method in five different etching solutions (LiF, NaF, KF, NH 4 F or HF). The as-prepared multi-layer MXene samples were furthered delaminated by tetrabutyl-ammonium hydroxide (TBAOH) to increase the interlayer distance. The c -lattice parameter ( c -LP) was increased from 20.3 Å to 23.87 Å. Thereafter, the electrochemical properties of Mo 2 CT x MXene samples as anode of Li-ion batteries (LIBs) were investigated. The multilayer Mo 2 CT x MXene made by KF + HCl etching had some residual K + on the surface and had higher discharge specific capacity (32.7 mA h/g at the current density of 800 mA/g) than the samples made by other etchants. This is because that the residual K + on MXene surface pillar the multi-layer structure, which provides larger room for Li + storage and immigration. The Mo 2 CT x MXene after delamination with the c -LP of 23.87 Å presented a high discharge specific capacity of 239 mA h/g at the current density of 800 mA/g, which was 7.3 times higher than the discharge specific capacity of Mo 2 CT x MXene before delamination. The final discharge specific capacity was 118.83 mA h/g at 2000 mA/g after 100 cycles. The superior electrochemical performance of delaminated Mo 2 CT x MXene was attributed to the more easily accessible ion active sites between layers and the lower resistance. Therefore, the increasing of interlayer distance is the main direction to improve the performance of Mo 2 CT x as anode of LIBs.
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APPLIED ENERGY
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2023
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IF 11.2
Ali Reza Kamali,Siyuan Li
Polyethylene terephthalate (PET) is one of the most widely used plastic materials, and therefore, its clean, efficient and low-cost valorization into high-value materials is of substantial economic and environmental interest. Here, for the first time, the utilization of molten salts for the facile, scalable and fast depolymerization of PET into terephthalic acid (C 8 H 6 O 4 ) is reported. It is asserted that the simple heat-treatment of PET in molten KCl-LiCl containing SnCl 2 in air leads to the green preparation of nanocrystalline terephthalic acid embedded with SnO 2 nanocrystals, with an excellent performance as the anode of lithium ion batteries (LIBs). The structural, morphological, thermal, surface, electrical and electrochemical characteristics of plastic-derived nanocomposites are evaluated by various techniques. The sample prepared at 500 °C (PDN-500) contains 28.3 wt% SnO 2 , and exhibits an enhanced bulk electrical conductivity of 447.3 S m −1 , and an excellent Li-ion storage capacity of 498 mAh g -1 after 500 cycles, corresponding to 1657 mAh per gram of SnO 2 . This performance is accompanied by an enhanced lithium ions diffusion coefficient of 8.51 × 10 −10 cm 2 s −1 recorded after 300 cycles, and a capacitive storage contribution of above 42 %. The sustainability of the presented molten salt approach is discussed from two complementary points of view, in terms of the clean conversion of waste plastics into high-performance anode materials for LIBs, as well as the facile and scalable depolymerization of PET, reducing the waste plastics in our environment. This article proposes an efficient and green strategy for the valorization of waste plastics into nanostructured SnO 2 @terephthalic acid for energy storage applications .
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Materials Today Energy
·
2022
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IF 9.257
Yun Zhao,Hualin Ye,Huanyu Zhang,Dan Zhao,Limin Huang,Jim Yang Lee
Li–S batteries assembled without a lithium metal anode can significantly increase the battery specific energy and obviate the safety issue of excess Li metal in the battery. In this study we found that a black phosphorous (BP) modified cooper foil current collector could provide a beneficial anode solid-electrolyte-interface (SEI) to enable the charging and discharging of Li-metal free Li 2 S-based batteries at higher C rates. The BP modification is effective in several aspects: the lithiophilicity of BP reduces the energy barrier in Li metal deposition and stripping during battery charge and discharge. The reactions between BP and lithium polysulfides also form Li 7 PS 6 in the anode SEI layer. Since Li 7 PS 6 has a high ionic conductivity for Li + diffusion, the Li plating/stripping efficiency is improved. The synergy of the lithiophilicity of BP and a Li 7 PS 6 -rich anode interphase layer was demonstrated in Li-metal free Li 2 S batteries, where the capacity retention over 100 cycles is 64.8% at the 0.2 C rate. The findings here show that current collector modifications should attend to multiple functionalities in order to be effective for the Li-metal free Li 2 S batteries.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Jing Xu,Yinbing Liu,Peilong Chen,Ao Wang,Ke-jing Huang,Linxia Fang,Xu Wu
Currently, the development of polyvalent ions battery systems are still restricted by lacking suitable cathode materials with high energy density and long cycle life attributing to sluggish kinetic mechanism and of polyvalent ions. Herein, an effective inter-layer scaling strategy is proposed by using a simple hydrothermal method . The super layer spacing VS 2 (∼1 nm) cathode dramatically improves electrochemical performance of zinc-ion batteries (ZIBs) and magnesium/lithium hybrid ion batteries (MLIBs). The specific discharge capacities of ZIBs and MLIBs are 450.7 and 488.8 mA h g −1 at current density of 0.1 A g −1 which are much higher than the same type of battery systems. Finally, the diffusion mechanism and the corresponding theoretical model is established by adopting first principles . In brief, the work provides an effective strategy for the large scale application of multivalent and hybrid batteries systems.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Pengfei Wu,Xiaoxin Guo,Zhiming Su,Chao Liu,Shaohong Chen,Zhicheng Zheng,Anhua Liu
SiOC anode is considered as a candidate for the next generation of lithium ion batteries, because of its appealing specific capacity and relative small volume expansion. However, the inherent inferior electron conductivity blocks its development. Recently, controlling the amount of free carbon domains is adopted to modify the performance, ignoring the influence of free C on the SiOC phases change and their synergistic effect on the performance. The crosslinking and polymerization competition between divinylbenzene and polymethylsilsesquioxane was coordinated to regulate the free carbon and phase composition of SiOC ceramics, and a durable SiOC anode with high ceramic yield was prepared. The result is that, keeping the proportion of free C about 10% and increasing the SiO 3 C and SiO 2 C 2 phases ratios can obtain good anode within limited cycle life (440 cycle in this work), and increasing free C amount further is necessary for durable long cycle life. Herein, S-DVB-2 anode with 12% free C delivers 698.7 mAh g −1 at a current density of 100 mA g −1 after 100 cycles, and S-DVB-1 anode with 20.6% free C shows excellent stable long cycle performance at the current density of 0.5 A g −1 , the remaining capacity is 476 mAh g −1 after 500 cycles.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Xueying Fan,Wen Zhang,Yongsheng Xu,Jie Zheng,Yang Li,Xiaobin Fan,Fengbao Zhang,Junyi Ji,Wenchao Peng
Tailoring the porous structure of carbon materials is one essential approach to improve the energy storage performance of carbon-based electrode materials . Herein, hierarchical porous carbons (HPCs) with different meso -structure are synthesized via a one-pot pyrolysis process with SiO 2 and ZnCl 2 as template and activator, respectively. The energy storage capacities of the obtained HPC samples are investigated as bi-functional electrode both for supercapacitor and LIBs . The results show that different meso -structure of HPCs can effectively affect the energy storage performance. In the range of 15 ∼ 50 nm, smaller size of mesopore can result better electrochemical performance of HPCs. And the optimized HPC sample (HPC-15) manifests high specific capacitance of 432F g −1 and good cyclic stability in the supercapacitor application. When used as anode of LIBs, the HPC-15 presents a high capacity of 820 mAh g −1 . In addition, COMSOL simulation is employed to study the effect of pore structure on mass transfer during electrochemical process. The HPC-15 is calculated to have the highest total porosity (ε p ) and effective diffusivity of K + (D e = 6.776 × 10 -10 m 2 s −1 ), thus leading to its best electrochemical performance.
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2022
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IF 7.926
Chuan-Zhu Zhang,Jun-Cheng Jiang,An-Chi Huang,Yan Tang,Lin-Jie Xie,Juan Zhai,Zhi-Xiang Xing
SiO/C anode materials for high-energy-density lithium-ion batteries (LIBs) have attracted considerable attention. However, battery capacity degradation and thermal safety problems caused by the large volume variation in the SiO/C anode during the long cycle limit its application. We propose the use of two composite additives to overcome the limitations of the current SiO/C anode materials. The electrochemical performance and thermal stability of the blank electrolyte (BE) and two composite additives were systematically compared using electrochemical, characterisation, and thermokinetic methods. The results revealed the synergistic effect of (2-cyanoethyl) triethoxysilane (TEOSCN) and 4, 5–difluoro‑1, 3–dioxolan‑2–one (DFEC) improved the cycling and thermal stability of the cells. The use of the additives resulted in the formation of a dense and thin SEI layer with LiF as the main material on the surface of the anode, which significantly improved the cycling stability of Li/SiO@C batteries. In addition, differential scanning calorimetry (DSC) measurements and thermokinetic analysis indicated that the addition of TEOSCN/DFEC significantly enhanced the thermal stability of the cells, which was mainly manifested as the delay of the exothermic peak and the increase in the activation energy of the mixture of the SiO/C anode and electrolyte. Our results suggested that the multifunctional additive offers a viable approach for developing LiBs with high energy density and excellent safety.
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Journal of Energy Chemistry
·
2022
·
IF 13.599
Shan Yi,Zhe Su,Wanyu Zhang,Hongli Chen,Yayun Zhang,Bo Niu,Donghui Long
Lithium metal batteries are among the strong contenders to satisfy the ever-increasing needs of energy storage systems, which however suffer from poor composition of the solid electrolyte interphase (SEI) layer and uncontrolled Li dendrites formation. In this regard, we report on the design of an ion-released MgI 2 -doped polyacrylonitrile (PAN) based nanofiber (MPANF) separator, which can lead to conducive SEI layer and dendrite-free Li anode. The combination of the lithophilic MgI 2 nanoparticles with polarized PAN matrix comprehensively functions as a high-compatible interpenetrating network to homogenize ionic transportation and confront dendrite growth. The released I ions introduce the high-ion-conductivity LiI into SEI layer, which could induce the formation of favorable and protective interface layer in the early stage, as embodied in the enrichment of advantageous components such as LiN x O y , Li 2 O, LiF, and Li 3 N. Profited from the high-affinity MPANF separator, the Li||Li symmetric cell achieves an ultra-low voltage hysteresis of 46 mV with an extended lifespan of 580 h. And a prolonged lifetime of 590 cycles with an enhanced specific capacity of 140.1 mAh g −1 and the Coulombic efficiency of 96.2% at 1 C can be obtained in full cells. This work may offer a facile and high-affinity alternative to traditional polymeric separators for high-performance and dendrite-free Li metal batteries.
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ELECTROCHIMICA ACTA
·
2022
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IF 7.336
Ling Yang,Lei Sheng,Xingxu Gao,Xin Xie,Yaozong Bai,Gaojun Liu,Haoyu Dong,Tao Wang,Xianli Huang,Jianping He
Lithium metal batteries (LMBs) with ultra-high theoretical energy density are a prospective candidate to replace current lithium-ion batteries (LIBs). However, there are still two non-negligible problems of lithium dendrites and the volume expansion effect of LMBs. In this study, reduced graphene oxide (rGO)/Li-Al-LDH composite nanosheets were firstly prepared via a hydrothermal method and then vacuum filtered onto commercial polypropylene (PP) separator. This kind of rGO/Li-Al-LDH nanosheets layer is expected to improve the wettability of liquid electrolytes and thermal stability. Furthermore, rich- Li-Al LDH can promote more ionic carriers and channels, which exhibits higher-efficiency lithium-ion transport properties. Meanwhile, rGO with a graphitic-like structure is able to disperse the concentration of electrons at the sharp point when lithium dendrites arise. As a result, the discharge capacity of the Li||LiFePO 4 cells based on the rGO/Li-Al-LDH@PP separator is still 1.852 mAh after 250 cycles and the capacity decay rate is just 4.24%. It is demonstrated that a feasible and effective strategy for the modified separator can enhance the electrochemical performance of LMBs.
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