InfoMat
·
2021
·Vol. 3
·期 7
·790-803
·
IF 25.405
Yongshang Zhang,Peng Zhang,Shijie Zhang,Zheng Wang,Neng Li,S. Ravi P. Silva,Guosheng Shao
The realistic application of lithium–sulfur (Li–S) batteries has been severely hindered by the sluggish conversion kinetics of polysulfides (LiPS) and inhomogeneous deposition of Li 2 S at high sulfur loading and low electrolyte/sulfur ratio (E/S). Herein, a flexible Li–S battery architecture based on electrocatalyzed cathodes made of interfacial engineered TiC nanofibers and in situ grown vertical graphene are developed. Integrated 1D/2D heterostructured electrocatalysts are realized to enable highly improved Li + and electron transportation together with significantly enhanced affinity to LiPS, which effectively accelerate the conversion kinetics between sulfur species, and thus induce homogeneous deposition of Li 2 S in the catalyzed cathodes. Consequently, highly active electro-electrocatalysts-based cells exhibit remarkable rate capability at 2C with a high specific capacity of 971 mAh g −1 . Even at ultra-high sulfur loading and low E/S ratio, the battery still delivers a high areal capacity of 9.1 mAh cm −2 , with a flexible pouch cell being demonstrated to power a LED array at different bending angles with a high capacity over 100 cycles. This work puts forward a novel pathway for the rational design of effective nanofiber electrocatalysts for cathodes of high-performance Li–S batteries.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy and Sustainability Research
·
2021
·Vol. 2
·期 7
·2100020
·
IF 0
Ahmed A. Aboalhassan,Yuanyuan Zhang,Hui Zhang,Jianhua Yan,Jianyong Yu,Bin Ding
Freestanding carbon nanofiber (CNF) films are promising flexible battery electrodes because of their rich functionalities and the avoidance of the unnecessary usage of conductive additives and binders, which introduce additional interfacial resistance. However, most reported freestanding CNF electrodes have lower energy density than the metrics of practical usage. Herein, an in situ welding strategy is proposed to fabricate flexible CNF electrodes with both high packing density (0.343 g cm −3 ) and capacity (832.4 mA h g −1 @0.1 C) by electrospinning of a polyacrylonitrile (PAN) and poly(vinyl-butyral) (PVB) sol followed by pyrolysis. The addition of 20 wt% of low-thermal-stability PVB into PAN carbon precursors endows the CNFs with mixed amorphous/graphitic carbon domains and welded structures. The former enhances the capacity and long-cycling stability, and the latter improves the flexibility and packing density of the anodes. As a result, these flexible anodes display stable reversible capacities of 430 mA h g −1 @1 C over 1000 cycles and excellent rate performance from 0.1 to 5 C. The successful fabrication of high-capacity CNF anodes at commercial-level density opens a new avenue for their practical application.
✓ 已验证
产品关联
DOI
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2020
·Vol. 646
·期 15
·1285-1291
·
IF 1.24
Siyuan Li,Jiapeng Ji,Zeheng Li,Lijing Yan,Wei Jiang,Min Ling,Zhan Lin,Chengdu Liang
The application of Li-rich and Mn-based layered cathode materials is impeded by the discharge voltage decay and capacity fading upon cycling, despite their high specific capacity. Here, we combine pre-activation and nanoscale defects modification of lithium rich and manganese based layered materials to mitigate the above two serious problems through improved anionic redox activity and Li + conductivity. The optimum constructed nanoscale defects rich cathode material delivers a reduced voltage fading rate of 1.27 mV per cycle compared to 3.7 mV per cycle for the pristine material after 200 cycles at 1 C rate. Moreover, the nanoscale defects rich material delivers a high specific discharge capacity of 173.1 mAh · g –1 with a high capacity retention of 99.5 % after 200 cycles at 1 C rate superior than the pristine material (89.3 mAh · g –1 and 53.4 %, respectively). This study highlights the reversibility of oxygen redox in electrochemical stability and effectiveness of nanoscale defects in stabilize voltage.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xianwei Geng,Ruowei Yi,Xiangfei Lin,Chenguang Liu,Yi Sun,Yingchao Zhao,Yinqing Li,Ivona Mitrovic,Rui Liu,Li Yang,Cezhou Zhao
Lithium-sulfur (Li–S) batteries have attracted more and more attention in recent years, as their theoretical capacity is several times larger than conventional lithium-ion batteries and they have a high energy density in secondary battery systems. In our work, a titanium carbide - titanium dioxide/single-walled carbon nanotube/sulfur (TiC–TiO 2 /SWCNT/S) cathode with high conductivity and effective polysulfides adsorption is prepared by a facile method for fabricating Li–S batteries. The batteries with this composite cathode show a good performance at 0.1 C due to relatively high utilization of sulfur, reaching 1338.6 mAh·g −1 specific capacity at first cycle and retaining 802.5 mAh·g −1 after 100 cycles. Meanwhile, it presents an excellent rate performance with 711.2 mAh·g −1 at 4 C, and recovers to 1006.9 mAh·g −1 when the current returns to 0.1 C. Also a slow capacity decay (0.045% decay rate per cycle) is observed at 1 C. These results suggest that a small amount of SWCNT can increase the conductivity of the whole composite to a great extent, and the strong adsorption ability of TiO 2 increases the cycle life. This work offers an efficient and low-cost strategy to obtain high performance batteries with great potential for commercial applications.
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 9
·1633
·
IF 4.324
Zhi Zhang,Zichuan Yi,Liming Liu,Jianjun Yang,Chongfu Zhang,Xinjian Pan,Feng Chi
Lithium-sulfur battery (LSB) will become the next generation energy storage device if its severe shuttle effect and sluggish redox kinetics can be effectively addressed. Here, a unique three-dimensional hollow reduced graphene oxide microsphere decorated with ZnO nanoparticles (3D-ZnO/rGO) is synthesized to decrease the dissolution of lithium polysulfide (LiPS) into the electrolyte. The chemical adsorption of ZnO on LiPS is combined with the physical adsorption of 3D-rGO microsphere to synergistically suppress the shuttle effect. The obtained 3D-ZnO/rGO can provide sufficient space for sulfur storage, and effectively alleviate the repeated volume changes of sulfur during the cycle. When the prepared S-3D-ZnO/rGO was used as the cathode in LSB, an initial discharge specific capacity of 1277 mAh g−1was achieved at 0.1 C. After 100 cycles, 949 mAh g−1can still be maintained. Even at 1 C, a reversible discharge specific capacity of 726 mAh g−1was delivered.Keywords:ZnO;graphene;spray drying;hollow structure;lithium-sulfur battery
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 39
·20604-20611
·
IF 11.301
Liang-Liang Gu,Jian Gao,Chuang Wang,Sheng-You Qiu,Ke-Xin Wang,Xiao-Tian Gao,Ke-Ning Sun,Peng-Jian Zuo,Xiao-Dong Zhu
Lithium–sulfur (Li–S) batteries are regarded as one of the most promising candidates for next-generation energy storage systems due to their advantages of its high specific capacity and low material cost. Regrettably, the electrical insulation nature of sulfur, the volume expansion during lithiation, and the internal shuttle effect aroused by the polysulfides dissolution are the central issues for sulfur cathodes. Here, CoFe2O4@C nanocages derived from Prussian blue analogues and polydopamine were utilized as a sulfur host to address these problems. The polar Co–Fe oxide afforded chemical adsorption sites for anchoring polysulfides to reduce the shuttling effect. The hollow core structure of the nanocages could withstand the large volume change during lithiation and delithiation processes. The conductive carbon layer on the nanocages could ameliorate the extremely low electrical conductivity of S and Li2S. The S/CoFe2O4@C cathode demonstrated high capacity and excellent cyclability (821 mA h g−1 after 100 cycles at 0.5C). More importantly, the combinational strategies of good conductivity, physical space encapsulation, and chemical adsorption provide a means of resolving the current cathode issues in Li–S batteries.
✓ 已验证
产品关联
DOI
高影响因子
BULLETIN OF MATERIALS SCIENCE
·
2020
·Vol. 43
·期 1
·1-7
·
IF 1.392
Zhou Lu,Yang Yue,Yan Xiang-Hui,Wang Bei-Ping,Zou Zhong-Li,Han Feng-Lan,Xue Tong
In this study, the performance of manganese oxide nanorods/reduced graphene oxide (MnO x /rGO) composite papers as anode for lithium-ion battery is investigated. The self-supporting and flexible composite papers are fabricated via traditional vacuum filtration. The crystal structure, chemical state and morphology are determined by XRD, XPS and SEM, respectively. And the electrochemical performance is measured by means of cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD) techniques. It is proved that the MnO x /rGO papers exhibit layer-by-layer structure in which rod-shaped MnO x is sandwiched among the rGO sheets. As anode for lithium-ion batteries, the capacity of MnO x /rGO paper can be stabilized at 518 mAh g −1 for 1500 charge/discharge cycles.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Zhihao Yang,Zeyu Sun,Chong Liu,Yinghua Li,Gouli Zhou,Shengwu Zuo,Jingtao Wang,Wenjia Wu
Solid-state electrolyte is a key component of high-energy-density and security all-solid-state lithium metal battery . However, the present solid polymer electrolyte (SPE) often suffers from the trade-off between ionic conductivity and mechanical stability. To this end, lithiated polydopamine-modified graphene oxide nanosheets (LiDGO) are fabricated, and incorporated into the representative poly(ethylene oxide) (PEO) matrix to prepare hybrid solid polymer electrolyte (HSPE). Despite the decreased crystallinity of PEO, the intrinsic advantage of organic-inorganic hybridization affords PEO-based HSPE highly improved mechanical stability. The tensile strength and elongation at break of HSPE are, respectively, 237% and 133% higher than those of blank PEO. The constructed long-range conduction pathways with locally concentrated Li + at PEO-LiDGO interfaces impart HSPE highly enhanced ionic conductivity . The ionic conductivity reaches 3.4 × 10 −5 S cm −1 at 30 °C, 10 times higher than that of blank PEO. These then bring excellent battery performances. The assembled battery achieves a discharge capacity of ~156 mAh g −1 after 200 cycles with ultra-high capacity retention of 98.7%. The strategy of utilizing lithiated nanosheets to address the trade-off between ionic conductivity and mechanical stability of SPE may pave the way for the development of high performance all-solid-state lithium metal batteries.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Zhen Sun,Yanqing Lai,Na Lv,Liangxing Jiang,Ming Jia,Jie Li,Weizhai Bao,Fangyang Liu
Solid-state batteries (SSBs) exhibit a promising prospect due to their potential in terms of safety and energy densities . As an oxide electrolyte, cubic garnet solid electrolyte (cubic-Li 7 La 3 Zr 2 O 12 ) attracts wide attention due to the high ionic conductivity . However, the problem of poor contact between garnet solid electrolyte and lithium impairs the development of solid electrolytes. Herein, we demonstrate an effective modification method to cope with the interface issue between electrolyte and Li metal by introducing an Ag@WSe 2 composite layer. By applying this method, the interfacial resistance between the garnet electrolyte and Li metal is reduced to ~12.5 Ω cm 2 , which is nearly 150 times lower than the value of 1900 Ω cm 2 before modification. The WSe 2 acts as a framework to immobilize Ag, while Ag forms an Ag–Li alloy with lithium for lithium ions transportation. And other Ag@TMDs (transition metal dichalcogenides) composites have also been proven to have similar effects. In addition, the Li | Ag@WSe 2 -LLZO | LFP full cell demonstrates a satisfactory capacity and excellent cycle stability (500 cycles with 90% capacity retention rate) at room temperature .
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Denghu Wei,Jie Yin,Zhicheng Ju,Suyuan Zeng,Haibo Li,Wei Zhao,Yanyan Wei,Huaiyong Li
Phosphorus sulfide cage molecule based on P 4 S 3 was investigated for the first time as anode material for the storage of alkali metal ions (Li + , Na + , K + ). Such P 4 S 3 sample was obtained in a large scale by a simple heating reaction of low-cost rep P and S. X-ray diffraction refinement analysis indicates that P 4 S 3 sample possesses a defect rich molecule crystal structure with S/P atom ratio of 0.74. The P 4 S 3 anode delivered a high reversible capacity of 1266 mAh g −1 for lithium-ion batteries at 0.1 A g −1 and good cycling performance. Experimental results demonstrated that the P 4 S 3 anode undergoes a reversible Li-storage reaction of P 4 S 3 + 11 Li + + 11 e − ↔ 0.5 Li 4 P 2 S 6 + 3 Li 3 P during cycling. It also exhibited a high capacity of 1002 and 378 mAh g −1 at 0.1 A g −1 for Na + and K + storage, respectively. These properties suggest the promising application of P 4 S 3 anode in high energy batteries.
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2020
·
IF 16.28
Xiaohong Zou,Kaiming Liao,Di Wang,Qian Lu,Chuan Zhou,Ping He,Ran Ran,Wei Zhou,Wanqin Jin,Zongping Shao
Although aprotic Li-air batteries offer an attractive option for achieving ultrahigh energy density of electrochemical energy storage devices, the now-established system has so far fallen short of its potential due to a daunting challenge related to its open configuration, which results in not only the rapid corrosion of Li metal anodes but also the gradual evaporation of organic liquid electrolytes. Here, we show that these issues can be well addressed by protecting the Li-air battery with a new O 2 -permeable silica-aerogel-reinforced polydimethylsiloxane external membrane (OPSP). The highly flexible OPSP basically benefiting from hydrogen-bond cross-linking can be constructed in situ on any substrate with particularly desirable properties such as being water-/electrolyte-proof, O 2 -permeable, high thermotolerance, and transparent, which allows stable cycling of coin-type and flexible Li-air batteries under harsh conditions, such as a highly volatile DMSO electrolyte (over 660 h), a humid air (O 2 ) atmosphere (over 700 h) or circumstances in air (O 2 )-saturated liquid water (over 25 h). This work could potentially open a new research direction in developing O 2 -permeable membranes through hydrogen-bond cross-linking for the unfettered design of metal-air batteries.
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 8
·4264-4272
·
IF 5.503
Wen Huang,Daqian Ruan,Hui Chen,Kai Hu,Juan Wen,Wenqi Yan,Yusong Zhu,Yi Zhang,Nengfei Yu,Yuping Wu
Suppressing rapid capacity decay caused by the shuttle effect of dissolved lithium polysulfides between two electrodes is crucial to the realization of a practical lithium–sulfur (Li–S) batteries. Herein, the shuttle effect of polysulfides was efficiently inhibited by using a lightweight and thin functional separator in the form of coating three-dimensional interconnected nitrogen-doped graphene-like porous carbon nanosheets on one surface of a commercial polypropylene separator. This structure for a thin functional separator heightens the reversible capacity and cycle performance by doping nitrogen to chemically bond with polysulfides and the porous carbon layer to physically block polysulfides. As a result, the Li–S batteries based on the functional separators deliver an initial capacity of 1169.0 mA h g−1 at current rate of 1C and a substantial capacity of 845.3 mA h g−1 after 500 cycles, corresponding to a low capacity decay of only 0.055% per cycle. Even at a high rate of 3C, the batteries can still deliver a high reversible capacity of 743.6 mA h g−1 with good cycle performance.
✓ 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）