JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Dehai Meng,Haozhi Duan,Shijie Wu,Xiaodan Ren,Shuxia Yuan
Lithium iron phosphate (LiFePO 4 ) is one of the most important cathode materials for high-performance lithium-ion batteries in the future due to its high safety, high reversibility, and good repeatability. However, high cost of lithium salt makes it difficult to large scale production in hydrothermal method . Therefore, it is urgent to reduce production costs of LiFePO 4 while maintaining the unique advantages of hydrothermal methods. In this work, the lithium iron phosphate powders (LFP-twi) with low Fe-Li anti-site defect concentration and inhibition along the direction [010] was constructed by hydrothermal reaction with low lithium usage. As a result, this allows the material to have an excellent reversible capacity (163.6 mAhg −1 at 0.1 C), ultra-high-rate capability (120 mAhg −1 at 10 C), and noticeable low-temperature performance (130 mAhg −1 at - 20 ℃ and 0.1 C). These findings open a new avenue for the development of high-density current and low-temperature resistant LiFePO 4 batteries.
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高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Zhaoyu Zhang,Yufei Zhang,Minghui Ye,Yongchao Tang,Xiaoqing Liu,Cheng Chao Li
SiO x /C composites are highly potential anode alternatives for next-generation lithium-ion batteries (LIBs) owing to their low cost and high theoretical capacity. However, the sluggish lithium-ion diffusion kinetics severely limit their practical capacity and rate performance. Herein, a high-capacity and high-rate anode based on commercial SiO x /C is facilely achieved by in situ constructing a Li + conductive interphase (LCI) to simultaneously boost the transport efficacy of Li + ions and buffer the volume expansion. The as-designed, LCI-protected SiO x /C anode delivers an exceptionally high capacity of 1420.9 mAh g −1 at 0.2 A g −1 , excellent rate performance (91.4% capacity retention from 0.2 A g −1 to 1 A g −1 ) and long cycling stability, substantially outstripping the pristine SiO x /C counterpart and most recently reported Si-based electrodes. More importantly, taking advantages of the fast and stable lithiation/delithiation processes, this electrode can also be adapted to further applications at large current densities (766.44 mAh g −1 at 5 A g −1 ) or high mass loadings (5.02 mAh cm −2 at 0.1 A g −1 , ∼3.5 mg cm −2 ). A full battery with satisfactory electrochemical performance is also demonstrated. The strategy of building ion conductive interphase to subtly tailor the transport behavior of Li + ions is anticipated to unlock the practical deployment of Si-based LIBs.
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高影响因子
Metals
·
2018
·Vol. 8
·期 4
·252
·
IF 1.704
Zhifeng Wang,Xiaomin Zhang,Yongguang Zhang,Man Li,Chunling Qin,Zhumabay Bakenov
CuS is a metal sulfide anode material used in constructing lithium ion batteries (LIBs) with great promise. However, its practical application is limited by rapid capacity decline, poor cycling, and rate performance. In this work, the CuS nanowire-on-nanoplate network is synthesized through an improved dealloying method under two contrasting reaction temperatures. When used as an LIB anode, the as-obtained CuS network exhibits superior cycling performance (420 mAh·g−1retained after 100 cycles at 0.2 C). When at 3 C, it still delivers a capacity of around 350 mAh·g−1. The improved electrochemical performances of the CuS anode should be attributed to the well-designed nanowire-on-nanoplate network structure in which the introduction of nanowires improves Li storage sites, shortens Li-ion diffusion distance, enhances the conductivity of active materials, and offers multiscale spaces for buffering the volume variation. The fabrication route adopted in this paper has an important significance for developing the dealloying technique and designing more suitable anode structures for LIBs.Keywords:dealloying;CuS;anode;Li-ion battery;metallic glass
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高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Zhiyi Wu,Shan Zhu,Xiangren Bai,Ming Liang,Xiang Zhang,Naiqin Zhao,Chunnian He
Benefiting from the unique chemical properties and the adjustable layered spacing, MXenes have been paid more attention to the field of energy storage and conversation, especially towards constructing hybrid structure for the use of Li-ion battery anodes. However, most MXene-based composites are achieved by the ex-situ mixing method on the basis of acid-etched MXene, which makes it extremely hard to maintain a good structural stability in the service process. Herein, we proposed a novel one-step in-situ strategy, i.e. SnCl 2 molten salt reaction with Ti 3 AlC 2 for synthesizing Sn-nanoconfined Ti 3 C 2 T x MXene composites. During the synthesis process, SnCl 2 not only executed as the Lewis acid to etch Ti 3 AlC 2 for obtaining Ti 3 C 2 T x MXene, but could also be in-situ transformed to Sn nanoparticles confined between the Ti 3 C 2 T x MXene layers. The 2D layer-confined effect inhibited the spontaneous coarsening of metal Sn at high temperature as well as the huge volume expansion during the electrochemical cycles. Meanwhile, the in-situ formed Sn nanoparticles as pillar played a decisive role in enlarging interlayered active spacing of Ti 3 C 2 T x MXene for Li-storage. As a result, the surprising enhancement of electrochemical Li-storage performances could be achieved during long-term cycling. This work provides a novel route to explore the application of MXene based on the molten salt methods.
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高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Chongyang Hao,Lina Chen,Yamin Zhang,Xiaowen Zheng,Linna Dai,Lijie Ci
Cations preintercalation is an effective way to optimize the crystal structure and improve the electrochemical behavior. An Ag + pre-intercalated Ag x MnO 2 material with ultrafine nanowire structure is prepared by a facile hydrothermal method . With optimized crystalline microstructure including expanded interlayer space and introduced multivalence of Mn, the as-prepared material exhibits superior performance as cathode for both Li-ion and Na-ion hybrid supercapacitors (HSCs). High specific capacitance of 424.7 F g −1 in Li 2 SO 4 electrolyte and 450.1 F g −1 in Na 2 SO 4 system are achieved. The assembled HSCs using Ag x MnO 2 and activated carbon (YEC-8A) as electrode materials deliver a wide operation potential window of 0–2.2 V and a high energy density of 204.30 Wh kg −1 at the power density of 167.15 W kg −1 for Li-ion HSCs and 131.08 Wh kg −1 at 107.25 W kg −1 for Na-ion HSCs. Furthermore, the as-fabricated HSCs deliver excellent cyclic stability. The capacitance retention is 79.4% after 20,000 cycles for Li-ion HSC and 84.9% after 10,000 cycles for Na-ion HCS .
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Zhiyi Gao,Zongjing Lu,Yining Zhang,Jing Xia,Xuejing Zhang,Chao Sun,Yijun Yang,Yong Xu,Ke Wang,Xi Wang,Jiannian Yao
Li-ion batteries (LIBs) suffer from severe capacity recession at subzero temperatures due to the dramatic increase in charge transfer resistance induced by the sluggish desolvation process. In this paper, we report on by using the weakly coordinating molecule as electrolyte (1 M LiPF 6 in EC: DMC: PC = 1:1:1 vol%), the cell with MoS 2 as the model electrode exhibits better cycling performance and rate capability than the cell using commercial electrolytes (1 M LiPF 6 in EC: DMC = 1:1 vol%). Theoretical calculations and infrared spectroscopy indicate that PC is a weakly coordinated electrolyte molecule to Li + . Further, the electrochemical kinetics indicates that more Li + in the as-made electrolyte can intercalate into the MoS 2 layer. The electrochemical impedance spectroscopy reveals that the weak interaction between Li + and solvent molecules reduces the activation energy of desolvation process. This novel design concept opens up new paths to exploit the advanced electrolyte for LIBs.
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yaqing Wei,Jiajun Chen,Siqi Wang,Xingguo Zhong,Rundi Xiong,Lin Gan,Ying Ma,Tianyou Zhai,Huiqiao Li
Many recent efforts on the electrode design for advanced Li-ion batteries (LIBs) are often devoted to increasing the gravimetric capacity, but little attention is paid to the volumetric capacity which is more critical for practical application. Though the alloying-type anode materials are quite attractive, the challenge is that they must be composited with a large amount of carbon materials (e.g., GO, rGO, CNT) to buffer their large volume change, which would undoubtedly sacrifice the volumetric energy density of the whole electrode due to the carbon’s low tap density (∼0.05 g/cm3). Herein, we propose the unique layered Sb2Te3, which possesses high conductivity and a large volumetric capacity (3419 mAh/cm3), to be served as the alternative anode for LIBs. Furthermore, we introduce natural graphite, which is low price and with high density (2.25 g/cm3), into Sb2Te3 to successfully build a novel Sb2Te3@Gra composite in which the Sb2Te3 particles are wrapped by graphite layers. Interestingly, this modified Sb2Te3@Gra exhibits much more superior cycle stability (570 mAh/g after 200 cycles, 96% retention) than pure Sb2Te3 (130 mAh/g after 200 cycles, 22% retention), while keeping its original large volumetric capacity output (∼3200 mAh/cm3) at the same time. More specially, it enables a reversible structure recovery of Sb2Te3, guaranteeing the electrode integrity and cyclability. These extraordinary phenomena are investigated in detail, whose results display that the outer graphite layer plays an important role by facilitating the intimate contact with Sb2Te3 particles and protecting them from pulverization. Besides, such graphite layer greatly promotes the electron-transfer during lithiation, helping to improve the rate capability (372 mAh/g at 2000 mA/g, 60% retention). Consequently, the assembled Sb2Te3//LiCoO2 full cell delivers a large capacity of 500 mAh/g, with stable discharge plateau and cycle stability, revealing its high potential for practical application.
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PubMed
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2018
·
IF 4.66
Wenfei Wei,Long Li,Lei Zhang,Jianhe Hong,Gang He
Despite having promising Li storage properties such as multielectron reactions and fast kinetics, organic electrode materials exhibit poor cycling stability, which is partly caused by their tendency to dissolve in liquid electrolytes . In this work, an all-solid-state Li-organic battery with excellent cycling stability and high discharge voltage was designed, in which poly(2-chloro-3,5,6-trisulfide-1,4-benzoquinone) (PCTB) and poly(ethylene glycol) (PEO)-based composite polymer electrolyte (CPE) served as the cathode and electrolyte respectively. The PEO-LiClO 4 -10 wt% Li 0.3 La 0.566 TiO 3 (LLTO) electrolyte has an excellent ionic conductivity of 7.99 × 10 −4 S cm −1 at 343 K. Furthermore, the all-solid-state battery exhibited a high discharge capacity of 104 mAh g −1 with an average potential of 2.72 V at 343 K. After 300 cycles, 90% of the maximum capacity was retained. These results shed light on the application of carbonyl compounds in conjunction with PEO-based electrolytes for Li-ion batteries.
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高影响因子
Batteries-Basel
·
2023
·Vol. 9
·期 6
·320
·
IF 4
Zhenghang Zhang,Rongzheng Fan,Saifang Huang,Jie Zhao,Yudong Zhang,Weiji Dai,Cuijiao Zhao,Xin Song,Peng Cao
Solid composite electrolytes exhibit tremendous potential for practical all-solid-state lithium metal batteries (ASSLMBs), whereas the interfacial contact between cathode and electrolyte remains a long-standing problem. Herein, we demonstrate an integrated design of a double-layer functional composite electrolyte and cathode (ID-FCC), which effectively improves interfacial contact and increases cycle stability. One composite electrolyte layer, PVDFLiFSI@LLZNTO (PL1@L), comes into contact with the LLZNTO (Li6.5La3Zr1.5Nb0.4Ta0.1O12)-containing cathode, while the other layer, PEOLiTFSI@LLZNTO (PL2@L) with a Li anode, is introduced in each. Such a design establishes a continuous network for the transport of Li+on the interface, and includes the advantages of both PEO and PVDF for improving stability with the electrodes. The Li symmetric cells Li/PL2@L-PL1@L-PL2@L/Li steadily cycled for more than 3800 h under the current density of 0.05 mA cm−2at 60 °C. Outstandingly, the all-solid-state batteries of LiFePO4-ID-FCC/Li showed an initial specific capacity of 161.5 mA h g−1at 60 °C, demonstrating a remaining capacity ratio of 56.1% after 1000 cycles at 0.1 C and 74.5% after 400 cycles at 0.5 C, respectively. This work provides an effective strategy for solid-state electrolyte and interface design towards ASSLMBs with high electrochemical performance.Keywords:all-solid-state lithium batteries;inorganic-polymer hybrid electrolyte;double-layer integrated design;garnet oxide (LLZNTO);cycle stability
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高影响因子
Energy Technology
·
2020
·Vol. 8
·期 9
·2000361
·
IF 3.404
Yihua Tang,Xinxin Wang,Jingjing Chen,Xiao Wang,Dajian Wang,Zhiyong Mao
Defects engineering is recognized as one promising strategy to enhance the electrochemical performance of carbon materials applied in energy storage field. Different from the commonly used methods, high-level N-doped carbon nanosheets are synthesized in this work via controllable removal of nitrogen atoms from nitrogen-rich graphite carbon nitride (g-C 3 N 4 ). The nitrogen doping levels and the relative amount of variable nitrogen types, including pyridinic-, pyrrolic-, and graphitic-N, are easily engineered for the obtained carbon nanosheets. Ultrahigh pyridinic-N content as high as 19.1 at% is achieved, closing to the highest values among the reported nitrogen-doped carbon materials. Extraordinary initial discharging capacity of 5190 mAh g −1 at a current density of 50 mA g −1 and excellent cycling stability (1639 mAh g −1 after 200 cycles) as well as promising rate performance (517 mAh g −1 at 2 A g −1 ) are demonstrated when serving as Li-ion battery anodes. The high nitrogen doping level, especially for the high pyridinic-N doping content in materials, is responsible for these outstanding electrochemical Li-ion storage performances. This work opens a new gateway to develop promising nitrogen-doped carbon materials for the practical application in energy storage devices.
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yu Rao,Kongjun Zhu,Guoliang Zhang,Feng Dang,Jiatao Chen,Penghua Liang,Zhihan Kong,Jun Guo,Hongjuan Zheng,Jie Zhang,Kang Yan,Jinsong Liu,Jing Wang
Molybdenum sulfide has been widely investigated as a prospective anode material for Li+/Na+ storage because of its unique layered structure and high theoretical capacity. However, the enormous volume variation and poor conductivity limit the development of molybdenum sulfide. The rational design of a heterogeneous interface is of great importance to improve the structure stability and electrical conductivity of electrode materials. Herein, a high-temperature mixing method is implemented in the hydrothermal process to synthesize the hybrid structure of MoS2/V2O3@carbon-graphene (MoS2/V2O3@C-rGO). The MoS2/V2O3@C-rGO composites exhibit superior Li+/Na+ storage performance due to the construction of the interface between the MoS2 and V2O3 components and the introduction of carbon materials, delivering a prominent reversible capacity of 564 mAh g–1 at 1 A g–1 after 600 cycles for lithium-ion batteries and 376.3 mAh g–1 at 1 A g–1 after 450 cycles for sodium-ion batteries. Theoretical calculations confirm that the construction of the interface between the MoS2 and V2O3 components can accelerate the reaction kinetics and enhance the charge-ionic transport of molybdenum sulfide. The results illustrate that interfacial engineering may be an effective guide to obtain high-performance electrode materials for Li+/Na+ storage.
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高影响因子
ChemSusChem
·
2019
·Vol. 12
·期 16
·3817-3826
·
IF 7.804
Hao Yang,Jingyuan Liu,Xiaofei Wang,Chengcheng Zhao,Lina Wang,Yonggang Wang,Yongyao Xia,Tianxi Liu
Graphical Lithium storage : One-dimensional (1D) LiMnPO 4 @C nanofibers with in situ-created 3D mesoporous architecture are reported, and the charge-storage behavior is addressed. Remarkably, the hierarchical construction promotes the pseudocapacitive contributions. The diffusion-controlled battery-type and surface-controlled capacitive faradaic redox processes act synergistically, giving new insights into Li-storage cathode materials to reach the goal of high energy and power densities simultaneously. Olivine-structured LiMnPO 4 (LMP) is an efficient Li + host owing to its high theoretical energy density and thermal stability. However, its poor ionic and electronic conductivity severely hinder its practical application. Herein, one-dimensional (1D) LMP@C nanofibers with in situ created 3D mesoporous architecture are reported and the charge-storage behavior is addressed. Ultrafine LMP nanoparticles are homogeneously confined in the nanofibers with interconnected and exposed mesoporous intersections, facilitating the electronic/ionic transportation and retarding the pulverization/fracture of electrodes. Remarkably, the hierarchical construction promotes a certain degree of pseudocapacitive contribution. The diffusion-controlled battery-type and surface-controlled capacitive faradaic redox processes act synergistically, giving new insights into Li-ion storage cathode materials to reach the common goal of high energy density and power density simultaneously. The current separation technique suggests surface-dominated pseudocapacitance as the major Li + storage mechanism at high rates, which is regarded as an efficient way to improve the rate performance. Hence, the as-prepared LMP@C nanofibers could deliver a high reversible capacity of 149.8 mAh g −1 with 92 % charge retention over 300 cycles at 0.2 C (1 C=171 mA g −1 ). Even at a high rate of 5 C, a capacity of 63.1 mAh g −1 is retained after 2000 cycles with an exceptional cyclic stability.
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高影响因子
危险品化学品经营许可证（带存储）