2D Materials
·
2022
·Vol. 9
·期 2
·025028
·
IF 6.861
Meng Yuan,Haodong Shi,Cong Dong,Shuanghao Zheng,Kai Wang,Shaoxu Wang,Zhong-Shuai Wu
Some vital challenges are main obstacles for further development of lithium–sulfur (Li–S) batteries such as low capacity and poor cycle stability resulted from polysulfide shuttling behavior, the physical/chemical entrapment is regarded as an effective method to inhibit and catalyze polysulfides. Herein we design a cross-linked framework of reduced graphene oxide anchored with Cu2−xSe nanoparticles (Cu2−xSe@rGO) by building an electrolyte/Cu2−xSe/graphene triple-phase interface to be a high-efficiency electrocatalyst for Li–S batteries. Importantly, this three-dimensional conductive network possesses a large specific surface area with high ion transport capability, meanwhile providing strong physical constraint for efficient adsorption of soluble polysulfides. Further, this triple-phase catalytic interface provides strong chemical adsorption and abundant Cu2−xSe nanoparticle sulfiphilic active sites, effectively inhibiting the dissolution of polysulfides and guaranteeing the efficient polysulfide adsorption catalysis as well as rapidly uniform Li2S nucleation. Consequently, with the Cu2−xSe@rGO separator, a lower capacity decay rate about 0.059% per cycle after 500 cycles at 2 C is obtained. What's more, with a higher areal sulfur loading of 3.0 mg cm−2, the capacity is still maintained at 805 mAh g−1 over 100 cycles. Therefore, this work will open new avenue to construct 2D transition metal selenide for superior performance Li–S batteries.
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DOI
高影响因子
Energy & Environmental Materials
·
2023
·Vol. 7
·期 3
·e12648
·
IF 15
Yanan Li,Shunchao Ma,Yuehua Zhao,Silin Chen,Tingting Xiao,Hongxing Yin,Huiyu Song,Xiumei Pan,Lina Cong,Haiming Xie
High Li + transference number electrolytes have long been understood to provide attractive candidates for realizing uniform deposition of Li + . However, such electrolytes with immobilized anions would result in incomplete solid electrolyte interphase (SEI) formation on the Li anode because it suffers from the absence of appropriate inorganic components entirely derived from anions decomposition. Herein, a boron-rich hexagonal polymer structured all-solid-state polymer electrolyte (BSPE+10% LiBOB) with regulated intermolecular interaction is proposed to trade off a high Li + transference number against stable SEI properties. The Li + transference number of the as-prepared electrolyte is increased from 0.23 to 0.83 owing to the boron-rich cross-linker (BC) addition. More intriguingly, for the first time, the experiments combined with theoretical calculation results reveal that BOB − anions have stronger interaction with B atoms in polymer chain than TFSI − , which significantly induce the TFSI − decomposition and consequently increase the amount of LiF and Li 3 N in the SEI layer. Eventually, a LiFePO 4 |BSPE+10% LiBOB|Li cell retains 96.7% after 400 cycles while the cell without BC-resisted electrolyte only retains 40.8%. BSPE+10% LiBOB also facilitates stable electrochemical cycling of solid-state Li-S cells. This study blazes a new trail in controlling the Li + transport ability and SEI properties, synergistically.
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高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 33
·335403
·
IF 3.551
Yong Wu,Tianli Han,Ting Zhou,Xue Qiao,Xi Chen,Ping Zhou,Jinyun Liu
Conventional approaches for preparing yolk-shell nanostructures require complicated procedures such as multi-step coatings and template removal. Herein, we present a new and general strategy for making yolk-shell nanocomposites based on an oil-in-water emulsion system. As a demonstrating case, silicon nanoparticles were dispersed in an oil phase which was in an oil-in-water emulsion; then the oil/water interface was in-situ polymerized to form microcapsules. After carbonization, the shell of microcapsules was formed. The Li-ion battery anodes based on the microcapsules exhibit a good electrochemical performance including stable capacity and high rate-performance. The capacity remains 1100 mAh g−1 after 500 cycles at a current density of 1.9 A g−1, along with a Coulombic efficiency of ≈ 99.9%. In addition, the method presented here is general, which is applicable for the synthesis of many yolk shell-structured nanocomposites.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 7
·5584-5594
·
IF 3.442
Lv Tingjian,Guan Li,Xiao Peng,Zhang Dongyun,Chang Chengkang
In this work, we report the preparation and the enhanced electrochemical performance of P2-type Na 0.67 Li x (Mn 0.5 Fe 0.25 Co 0.25 ) 1− x O 2 layered cathode materials with different Li substitutions via a nanomilling-assisted solid-state method. The experimental results show that the introduced lithium ions can greatly improve the performance of the material after entering the transition metal layer. Among these synthesized samples, the Na 0.67 Li 0.03 (Mn 0.5 Fe 0.25 Co 0.25 ) 0.97 O 2 electrode exhibits an exceptionally high specific capacity of 190.6 mAh g −1 at 0.1 C rate and a capacity retention of 89.5% after 30 cycles. Obviously, the specific capacity retention is improved by 15.3% compared with the pristine Na 0.67 (Mn 0.5 Fe 0.25 Co 0.25 )O 2 without Li incorporation (the specific capacity retention is only 74.2% after 30 cycles). Simultaneously, the sample also shows a large increase in rate performance compared to the pristine material. All of the enhancement can be explained by the fact that the introduced Li ions suppress the phase transition during the charge–discharge process and avoid the volume expansion of the electrode, which significantly reduce the occurrence of micro-cracks within the electrode. The reduced polarization, the decreased internal resistance of the prepared electrodes and the increased sodium ion diffusion coefficient, as confirmed from the CV and EIS measurements, can be regarded as the three major reasons for the enhanced electrochemical performance of the Li ion-substituted materials.
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Small
·
2021
·Vol. 17
·期 47
·2103830
·
IF 13.281
Xiaohua Li,Zhao Jiang,Dan Cai,Xiuli Wang,Xinhui Xia,Changdong Gu,Jiangping Tu
All-solid-state lithium batteries (ASSLBs) adopting sulfide electrolytes and high-voltage layered oxide cathodes have moved into the mainstream owing to their superior safety and immense potential in high energy density. However, the poor electrochemical compatibility between oxide cathodes and sulfide electrolytes remains a challenge for high-performance ASSLBs. In this study, a nanoscale Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 (LATP) phosphate coating is reasonably constructed on the surface of single-crystal LiNi 0.6 Co 0.2 Mn 0.2 O 2 particles to achieve cathode/electrolyte interfacial stability. The conformal LATP layer with inherent high-voltage stability can effectively suppress the oxidation decomposition of the electrolyte and demonstrate chemical inertness to both the oxide cathode and Li 10 SnP 2 S 12 electrolyte. ASSLBs with an LATP-modified cathode exhibited a high initial discharge capacity (152.1 mAh g −1 ), acceptable rate capability, and superior cycling performance with a capacity retention of 87.6% after 100 cycles at 0.1 C. Interfacial modification is an effective approach for achieving high-performance sulfide-based ASSLBs with superior interfacial stability.
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高影响因子
RSC Advances
·
2013
·Vol. 3
·期 32
·13149-13155
·
IF 2.562
Kunlei Zhu,Jianhua Tian,Yiping Liu,Na Lin,Qiwei Tang,Xiangmei Yu,Yingming Zhu,Zhongqiang Shan
The effect of reaction temperature and aging time on TiO2 precursor beads synthesized using a sol–gel method was studied. The size of the precursor beads decreased and deformed spheres appeared with increasing temperature. Meanwhile, TiO2 precursor beads grew with the aging time up to a reaction time of 18 h. Using a solvothermal process for the precursor beads, submicron-sized mesoporous anatase TiO2 beads (SMATBs) with a specific surface of 153.2 m2 g−1, much higher than initially reported, were synthesized by controlling the reaction conditions and were successfully employed as negative electrode for Li-ion batteries. The specific capacities of the submicron-sized mesoporous TiO2 beads are much higher than those of their counterparts at high charge–discharge rates. In the first cycle, the TiO2 beads showed discharge capacities of 172.0 mA h g−1, 129.6 mA h g−1, 117.1 mA h g−1 and 56.7 mA h g−1 at charge–discharge rates of 1 C (1 C = 170 mA g−1), 5 C, 10 C and 30 C, respectively. 85.1% discharge capacities were retained after 200 cycles at 1 C charge–discharge rate. After 600 cycles, there is still 81.8% discharge capacity retained at 5 C charge–discharge rate. Moreover, the TiO2 beads also exhibitied 86.9 mA h g−1 and 34.0 mA h g−1 discharge capacities at 10 C and 30 C charge–discharge rates over 600 cycles, respectively. In addition, the Coulombic efficiency is nearly 100% at each cycle at various charge–discharge rates.
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DOI
高影响因子
Science China-Chemistry
·
2014
·Vol. 57
·期 5
·662-668
·
IF 1.516
Chai YunFeng,Pan YuanJiang
Protonation and alkali-metal cation adduction are the most important ionization processes in soft-ionization mass spectrometry. Studies on the fragmentation mechanism of protonated and alkali-metal-cationized compounds in tandem mass spectrometry are essential and helpful for structural analysis. In some cases, it was often observed that a compound attached by different alkali-metal cations (or proton) exhibits similar fragmentation patterns but the relative abundances of product ions are different. This difference was considered to derive from the different electrostatic interactions of alkali-metal cations (or the bonded effect of proton) with the analyte. The alkali-metal cation with a smaller ionic radius shows stronger electrostatic interaction with the molecule because of its higher charge density. In addition, the bonded effect of the proton is stronger than the electrostatic interaction of the alkali-metal cation. In the present study, which used McLafferty-type rearrangements of even-electron ions ([M + Cat] + , Cat = H, Li, Na, K) as model reactions, the effect of cation size in mass spectrometric fragmentation reactions is highlighted. These considerations were also successfully applied to interpret the similar but distinct fragmentation behavior of proton and alkali-metal cation adducts of a synthetic compound (2-(acetamido(phenyl)methyl)-3-oxobutanoate) and a drug (entecavir).
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DOI
高影响因子
Frontiers in Materials
·
2018
·
IF 2.008
Zhimin Zou,Limin Wu,Jianwei Chen,Chunhai Jiang
Graphene is not an ideal anode material of Li-ion batteries because of its low packing density and low initial Coulombic Efficiency although it shows much higher specific capacity than graphite. Herein, we report a sandwich-structured hybrid anode material which integrates the nitrogen-doped amorphous carbon nanoarrays on both sides of graphene nanoplatelets. The former provides high capacity and excellent rate capability, while the latter stabilizes the cycle performance, both of them brought out outstanding electrochemical properties to the hybrid anode. High discharge capacities of 562 and 217 mA h g−1 are obtained at current densities of 0.1 and 3 A g−1, respectively, which are much higher than those of the starting graphene nanoplatelets (404 and 81 mA h g−1, respectively). Moreover, a discharge capacity of 540 mA h g−1 is maintained after 300 cycles at 0.5 A g−1, demonstrating an excellent cycle stability. This study provides a facile process to prop up the 2 D graphene nanoplatelets with vertically aligned carbon nanoarrays, which may push forward the application of graphene as anode material of Li-ion batteries because of the avoided aggregation and additional Li storage capacity contributed by the N-doped amorphous carbon.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xiaohui Tian,Yanbin Zhu,Zhihao Tang,Pengfei Xie,Angulakshmi Natarajan,Yingke Zhou
A unique 3D porous graphene aerogel wrapped LiNi 0.6 Co 0.2 Mn 0.2 O 2 nanoparticle composite (NCM@GA) was prepared via a facile coprecipitation followed with a hydrothermal treatment . The morphological and structural characterizations reveal that the graphene nanosheets adhere tightly to the NCM nanoparticle surface and randomly intertwine to form a three-dimensional porous conductive aerogel network. The galvanostatic charge/discharge tests imply that the NCM@GA composite displays a high initial discharge capacity of 189.9 mAh g −1 (0.1 C), an excellent rate capability of 130.9 mAh g −1 (5 C) and 106.8 mAh g −1 (10 C), and an outstanding cyclic stability (an average decay rate of approximately 0.04% over 200 cycles at 1 C). The outstanding electrochemical performance is due to the synergy between the porous GA framework and the well-dispersed NCM nanoparticles, which facilitates the rapid diffusion of both Li + and electrons and accommodates the volumetric change during the Li + insertion/deinsertion process. The novel electrode design strategy described here is promising for constructing other advanced composite cathodes used in power Li-ion batteries.
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高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Xueqian Ji,Yuxing Xu,Yuncheng Zhou,Jiechen Song,Hailan Feng,Pengfei Wang,Jun Yang,Fuchang Zhuge,Haijiao Xie,Qiangqiang Tan
Because of high energy density and work voltage, the Li-rich materials are considered to be one of the most promising next-generation lithium-ion batteries. However, the commercial applications are limited by the capacity loss, poor rate capability, and voltage decay during cycling. Herein, functionalizing the surface of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 by Ca 0.95 Bi 0.05 MnO 3 is proposed, which suppresses the formation of the oxygen vacancies and maintains structural stability by high oxygen affinity and alleviative electrolyte corrosion. Electrochemical tests demonstrate that this admirable electrode delivers excellent cycling stability. The Li-rich electrode decorated with 5 wt.% Ca 0.95 Bi 0.05 MnO 3 exhibits a stable capacity retention of 86.5% at 0.1C after 200 cycles and an excellent full cell performance with the energy retention of 95.4% at 0.1C after 100 cycles. Moreover, the voltage decay of the modified material is restrained from 5.02 to 3.07 mV per cycle over 200 cycles. The finding here sheds new light on the development of the better Li-rich cathodes for improving electrochemical performance of electrode materials.
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高影响因子
Materials Today Nano
·
2022
·
IF 13.364
Q. Sun,X. Chen,J. Xie,C. Huang,X. Xu,J. Tu,C. Shen,Y. Jin,K. Zhang,F. Chen,T. Zhu,X. Zhao,J. Cheng
Garnet-type Li 7 La 3 Zr 2 O 12 (LLZO) ceramics has been considered as an ideal solid-state electrolyte for Li metal cells because of its high ionic conductivity and relatively stable interface with Li. However, it is electrochemically incompatible with some high-voltage cathodes, e.g. LiCoO 2 . In this work, a nanoscale Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) fast ion conductor was coated on LiCoO 2 (only 1 wt% LATP), bringing obviously enhanced interfacial compatibility with a composite electrolyte composed of Al, Nb-codoped LLZO and polyethylene oxide (PEO). A free-standing, flexible and ultrathin (20 μm) electrolyte membrane was successfully fabricated by a facile and scalable route, even though with a high ceramics content (67 wt%). Quasi-solid-state coin and pouch-type Li cells were assembled with the LATP-coated LiCoO 2 cathode, free-standing composite electrolyte and Li anode, together with soft interface modification by in-situ polymerization. The cells show stable cycling due to combined factors of enhanced electrode/electrolyte compatibility, ultrathin nature of the electrolyte membrane and the in-situ built soft interface. The pouch cells can be cycled for 300 cycles at 0.3 C and 60 °C with 80% retention. The pouch cells can endure abuse tests of bending, cutting and nail penetration. At a practical LiCoO 2 loading of 3 mAh cm −2 , the Li|LiCoO 2 pouch cell still shows stable cycling with 90% retention after 100 cycles at 60 °C (0.2 C charge/0.5 C discharge). This work provides a practical method to fabricate high-performance solid-state Li cells.
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DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Qi Ye,Haoyue Liang,Shuhao Wang,Can Cui,Cheng Zeng,Tianyou Zhai,Huiqiao Li
Poly (ethylene oxide) (PEO)-based solid polymer electrolyte is always the most promising candidate for preparing thinner, lighter and safer lithium-ion batteries. However, the lithium dendrites growth of lithium anode and the high-voltage oxidation of cathode are easy to cause the PEO-based battery failure. The way to deal with the different challenges on both sides of the anode and cathode is pursued all the time. In this study, we reported a new strategy to construct the PVDF/PEO/PVDF three-layer structure for solid polymer electrolyte (marked as PVDF@PEO) using PVDF as the functional “skin”. The PVDF@PEO electrolyte can effectively prevent from the lithium dendrites, and shows a stable cycling life over 1000 h in the Li/PVDF@PEO/Li cell. In addition, the PVDF@PEO electrolyte exhibits higher oxidation resistance and can be matched with high-voltage LiCoO 2 cathode. The Li/PVDF@PEO/ LiCoO 2 cell delivered a specific capacity of about 150 mAh g −1 over 150 cycles and maintained good cycling stability. Our research provides insights that the polymer electrolytes constructed with PVDF functional “skin” can simultaneously meet the challenges of both anode and cathode in solid-state lithium-ion batteries (SSLIBs).
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高影响因子
危险品化学品经营许可证（带存储）