NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 21
·17311-17316
·
IF 3.201
Changjin Li,Zhengyi Qian,Yulin Ma,Pengjian Zuo,Chunyu Du,Hua Huo,Geping Yin
Non-aqueous rechargeable Li–O2 batteries have attracted great attention owing to their ultra-high specific energy densities. However, the high charge overpotential and the interfacial instability of lithium anodes still need to be overcome before the practical application of Li–O2 batteries. Here, we use KI as a bifunctional electrolyte additive for Li–O2 batteries. The results demonstrate that I− could act as a redox mediator to effectively reduce the charge overpotential by 0.7 V. On the other hand, the introduction of K+ contributes to decreasing the polarization, optimizing the morphology, reducing the surface by-products of the lithium anode and dramatically improving the uniform distribution of discharge products on the cathode surface. The dual functions of KI additive thus successfully boost the electrochemical performances of Li–O2 batteries.
研究领域:
电化学
·
能源材料
·
锂离子电池
·
界面化学
·
储能技术
✓ 已验证
DOI
高影响因子
Silicon
·
2019
·Vol. 12
·期 9
·2259-2269
·
IF 1.21
Liu Wenping,Xu Huarui,Qin Haiqing,Lv Yanlu,Zhu Guisheng,Lin Feng,Lei Xiaoxu,Zhang Zhenjun,Wang Lihui
The monocrystalline silicon nanoparticles were prepared by induction plasma technology with micron silicon powder as raw material. The mean particle size is 70 and 15 nm silicon nanoparticles prepared with the quenching gas flow rate at 50 and 100 L min −1 , respectively. The particle size, crystallinity and morphology are mainly influenced by the quenching gas flow rate. The fine grit silicon nanoparticles can be formed under the condition of high quenching gas flow rate due to the inhibition of nucleation and growth. The silicon nanoparticles were used to synthesis Si@Graphite composites, the initial discharge capacity and coulombic efficiency of 70 nm Si@Graphite composites are 531.9 mAh g −1 and 83.4%, while 15 nm Si@Graphite composites are 510.6 mAh g −1 and 81.73%, respectively. The capacity retention of 70 nm Si@Graphite composites after 500 cycles is only 52.9%, while 15 nm Si@Graphite composites is 88%. It has been found the fracture of silicon nanoparticles and graphite along with the destruction of electrode structure lead to the capacity loss in the 70 nm Si@Graphite composites electrode. Because the forming of larger solid electrolyte interphase (SEI) film in 15 nm Si@Graphite composites electrode, the charge transfer on the electrode surface is hindered. However, the lithium-ion diffusion ability of 15 nm Si@Graphite composites is little higher than 70 nm Si@Graphite composites.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
无机非金属材料
✓ 已验证
DOI
高影响因子
RARE METALS
·
2024
·Vol. 43
·期 3
·1006-1016
·
IF 9.6
Chen Xin-Yang,Gao Xue-Jie,Wu Han-Yan,Liu Yu-Long,Yang Xiao-Fei,Sun Run-Cang
Quasi-solid-state lithium metal batteries (QSSLMBs) assembled with polyvinylidene fluoride (PVDF) are a promising class of next-generation rechargeable batteries due to their safety, high energy density, and superior interfacial properties. However, PVDF has a series of inherent drawbacks such as low ionic conductivity, ease of crystallization, and hydrophobic character that leading to poor cell properties. To tackle these issues, a lignin-reinforced PVDF electrolyte is proposed in this work to solve these drawbacks of PVDF and enhance the comprehensive performance of QSSBs. The lithophilic polar groups of lignin can promote uniform deposition of Li on the electrodes. Cooperating with the improved mechanical properties can efficiently prevent Li dendrites penetration through the separator. In addition, more active sites provided by lignin can also enhance Li + transport and lead to a faster electrochemical reaction kinetic. Benefitting from the ingenious design, Li symmetric cells with 5% lignin-PVDF quasi-solid-state electrolyte can operate for 900 h at a high current density/capacity of 5 mA·cm −2 /5 mAh·cm −2 , while short-circuiting occurs after 56 h for the counterpart (pure PVDF). Moreover, a full cell of Li/5% lignin-PVDF/LFP cell demonstrates a high capacity of 96.2 mAh·g −1 after 2000 cycles at 10 C. This work is expected to open up promising opportunities to develop other high-energy/power-density QSSLMBs. Graphical abstract
研究领域:
材料科学
·
电化学
·
储能
·
高分子科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Tianci Cao,Xiaopeng Cheng,Rui Wu,Mingming Wang,Jiajia Niu,Huan Liu,Xianqiang Liu,Junxia Lu,Yuefei Zhang
Li metal is the prospective candidate of next generation anode materials . However, the growth of dendritic Li during electrochemical cycling has severely hindered the practical application of rechargeable Li-metal batteries. Herein, “seaweed” graphene paper (SGP) is designed for 3D matrix of Li metal anode to address the growth of dendrites. SGP has abundantly exposed edges of graphene sheets and realizes ultrahigh density nucleation. Compared with nonuniform lithium deposition on parallelly stacked GP which has been observed by in-situ scanning electron microscopy, electrochemical deposition behavior of Li in SGP manifests as uniformly distributed granular lithium. Significant decrease of nucleation barrier can be observed during the dendrite-free deposition. With the elimination of dendritic Li growth and excellent stability of SGP host, the lithium anode based on SGP can run over 2500 cycles without short circuit and exhibits low voltage hysteresis. When matched with cathode LiCoO2, the full battery also presents stable cycling. There is no trace of lithium dendrite even after 1200 cycles which proves continuously regulating effect on lithium dendrites by SGP host. This work further develops potential application of graphene materials in the Li anode with high reversibility for stable cycling Li metal batteries .
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Chao-Ying Fan,Si-Yu Liu,Huan-Huan Li,Hai-Feng Wang,Han-Chi Wang,Xing-Long Wu,Hai-Zhu Sun,Jing-Ping Zhang
The synergistic design of cathode region was conducted to minimize the shuttle effect of polysulfides and decrease the loading of inactive components in order to acquire high-energy-density lithium–sulfur (Li–S) batteries. The well-designed cathode region presented two special characteristics: one was the intertwined nanofibers interlayer based on ultrafine TiO2 nanocrystal uniformly embedded within N-doping porous carbon; the other was the lightweight and three-dimensional current collector of fibrous cellulose paper coated by reduced graphene oxide. In consequence, the decent reversible capacity of 874.8 mA h g–1 was acquired at 0.1 C with a capacity retention of 91.83% after 100 cycles. Besides, the satisfactory capacity of 670 mA h g–1 was delivered after 300 cycles at 1 C with the small decay rate of only 0.08%. Because of higher capacity and lower loading of inactive component in cathode region, the energy density of cell increased more than five times compared with unmodified cell. Moreover, to further enhance the energy density, the high-sulfur-loading electrode was fabricated. A good areal capacity of 4.27 mA h cm–2 was retained for the cell with the active material of 4 mg cm–2 and the cycle stability was also well-maintained. In addition, due to the flexibility of interlayer and current collector, Li–S full cell (in pouch cell format) was easily curved. Therefore, the synergistic design for cathode region, which combines the flexible and mass-produced interlayer and current collector together, provides an effective access to Li–S batteries with high energy density and flexibility for practical application.
研究领域:
储能
·
材料科学
·
电化学
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Libin Wang,Huiling Yang,Ting Shu,Yue Xin,Xue Chen,Yuyu Li,Heng Li,Xianluo Hu
Li-ion capacitors, comprising a battery anode and a supercapacitor cathode, have been expected to bridge the gap between batteries and supercapacitors. However, the kinetics mismatch between the anodic sluggish insertion and the cathodic capacitive process has impeded the energy-storage potential of devices. Developing pseudocapacitive anode materials is urgently needed in that pseudocapacitance can deliver energy in the same time scale as electrostatic adsorption and offer a comparable level of energy storage to that of battery-type materials. Here we demonstrate an inside and outside synergistic nanoengineering strategy to synthesize nanoporous carbon-modified S-TiO2 hybrid nanosheets, through which both the carbon layer and sulfur doping can be simultaneously generated in situ. Benefiting from the in situ S doping, the electronic and ionic conductivity of anatase TiO2 nanoparticles is enhanced. The carbon-modified S-TiO2 with dominant pseudocapacitance realizes an unprecedentedly high capacity of 550 mAh g–1 at 0.3 C and excellent rate capability, outperforming that of the ever-reported TiO2-based materials. Furthermore, a hybrid Li-ion capacitor based on the as-obtained carbon-modified S-TiO2 electrode has been assembled, delivering a high energy density of 92.7 Wh kg–1 and power density of 26 kW kg–1 with a stable cycling life (85.8% after 10 000 cycles). Our work offers a new avenue for achieving electrode materials with extrinsic pseudocapacitance that is kinetically comparable to capacitive materials.
研究领域:
材料科学
·
能量存储与转换
·
纳米技术
·
电化学
✓ 已验证
DOI
ACS Nano
·
2017
·
IF 13.942
Wenshu Chen,Jiajun Gu,Qinglei Liu,Ruichun Luo,Lulu Yao,Boya Sun,Wang Zhang,Huilan Su,Bin Chen,Pan Liu,Di Zhang
We prepare group VI transitional metal dichalcogenides (TMDs, or MX2) from the 1T phase with quantum-sized and monolayer features via a quasi-full electrochemical process. The resulting two-dimensional (2D) MX2 (M = W, Mo; X = S, Se) quantum dots (QDs) are ca. 3.0–5.4 nm in size with a high 1T phase fraction of ca. 92%–97%. We attribute this to the high Li content intercalated in the 1T-MX2 lattice (mole ratio of Li:M is over 2:1), which is achieved by an increased lithiation driving force and a reduced electrochemical lithiation rate (0.001 A/g). The high Li content not only promotes the 2H → 1T phase transition but also generates significant inner stress that facilitates lattice breaking for MX2 crystals. Because of their high proportion of metallic 1T phase and sufficient active sites induced by the small lateral size, the 2D 1T-MoS2 QDs show excellent hydrogen evolution reactivity (with a typical η10 of 92 mV, Tafel slope of 44 mV/dec, and J0 of 4.16 × 10–4 A/cm2). This electrochemical route toward 2D QDs might help boost the development of 2D materials in energy-related areas.
研究领域:
材料科学
·
纳米技术
·
电化学
·
能量存储与转换
·
催化
✓ 已验证
DOI
高影响因子
Journal of the American Chemical Society
·
2024
·
IF 14.4
Jing-Chang Li,Jiayi Tang,Jiaming Tian,Chen Cheng,Yuxin Liao,Bingwen Hu,Tao Yu,Haoyu Li,Zhaoguo Liu,Yuan Rao,Yu Deng,Liang Zhang,Xiaoyu Zhang,Shaohua Guo,Haoshen Zhou
The utilization of anionic redox chemistry provides an opportunity to further improve the energy density of Li-ion batteries, particularly for Li-rich layered oxides. However, oxygen-based hosts still suffer from unfavorable structural rearrangement, including the oxygen release and transition metal (TM)-ion migration, in association with the tenuous framework rooted in the ionicity of the TM–O bonding. An intrinsic solution, by using a sulfur-based host with strong TM–S covalency, is proposed here to buffer the lattice distortion upon the highly activating sulfur redox process, and it achieves howling success in stabilizing the host frameworks. Experimental results demonstrate the prolonged preservation of the layered sulfur lattice, especially the honeycomb superlattice, during the Li+ extraction/insertion process in contrast to the large structural degeneration in Li-rich oxides. Moreover, the Li-rich sulfide cathodes exhibited a negligible overpotential of 0.08 V and a voltage drop of 0.13 mV/cycle, while maintaining a substantial reversible capacity upon cycling. These superior electrochemical performances can be unambiguously ascribed to the much shorter trajectories of sulfur in comparison to those of oxygen revealed by molecular dynamics simulations at a large scale (∼30 nm) and a long time scale (∼300 ps) via high-dimensional neural network potentials during the delithiation process. Our findings highlight the importance of stabilizing host frameworks and establish general guidance for designing Li-rich cathodes with durable anionic redox chemistry.
研究领域:
材料科学
·
电化学
·
储能技术
·
锂离子电池
·
计算材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 7
·5115-5126
·
IF 3.5
Chao Pan,Aiyang Wang,Wenwen Zhang,Jinyong Zhang,Weimin Wang,Fan Zhang,Zhengyi Fu
Lithium (Li)-doped boron carbide (B 4 C) has generated widespread attention for its potential to enhance mechanical properties. Nevertheless, the influence of the Li solid solution on the microstructure and mechanical properties of B 4 C ceramics remain unclear. In this research, the microstructure of Li-doped B 4 C was investigated in meticulous detail. Through X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy analysis, it was confirmed that Li successfully solubilized in B 4 C at 1 500°C under 50 MPa for an 8 min, resulting in lattice expansion. Further insights from electron energy loss spectroscopy revealed the integration of Li into the crystal lattice and alterations in the C–B–C chains. Furthermore, the Li 2 O content significantly affected the densification and microstructure of B 4 C. Relative density increased from 91.2% (B 4 C) to 99.2% (9 wt.% Li 2 O–B 4 C), accompanied by a transition from a few intragranular planar defects to high-density twins. Mechanical property tests demonstrated that 9 wt.% Li 2 O–B 4 C exhibited optimal comprehensive mechanical performance, with a flexural strength of 533 ± 27 MPa, fracture toughness of 3.71 ± 0.29 MPa∙m 1/2 , hardness of 33.3 ± 0.6 GPa, and a density of just 2.45 g/cm 3 , surpassing that of pure B 4 C.
研究领域:
材料科学
·
陶瓷
·
固态化学
·
微观结构分析
·
力学性能
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Qiuyan Bi,Shiai Xu
A positively charged PI/PDA/PEI nanofiltration membrane was prepared in this study by crosslinking between polyethyleneimine (PEI) and poly(dopamine) (PDA) on the polyimide (PI) support membrane for separating Mg 2+ and Li + from MgCl 2 /LiCl mixed solution, and its chemical structure, surface properties, and separation performance were investigated. The results indicate that the PI/PDA/PEI membrane has a thin positively charged layer and shows excellent rejections against many inorganic salts [MgCl 2 (93.1%) > MgSO 4 (86.5%) > Na 2 SO 4 (74.7%) > LiCl (37.6%)]. More importantly, the membrane exhibits long-term stability and good separation of Mg 2+ and Li + , and the Mg/Li ratio of the permeate of brine obtained from West Taijnar salt lake can be reduced from 65.3 to 5.0 at pH 6.5 by filtration.
研究领域:
膜科学
·
分离技术
·
纳滤技术
·
离子分离
·
表面改性
·
材料科学
✓ 已验证
DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 10
·4127-4134
·
IF 2.817
Guan Dichang,Huang Yong,He Meimei,Hu Guorong,Peng Zhongdong,Cao Yanbing,Du Ke
All-solid-state Li-ion batteries (ASSLBs) are promising systems to power electronic devices and electric vehicles for their high-energy density and safety. PEO-based composite electrolytes containing lithium salts and various fillers have been regarded as the most attractive solid electrolytes for ASSLBs due to their high interfacial compatibility with electrodes, high mechanical flexibility, and easy fabrication. For PEO/lithium salt/ceramic composite electrolytes, both “ceramic-in-polymer” and “polymer in ceramic” can be applied to solid-state batteries. “Ceramic-in-polymer” can provide high ionic conductivity but narrow electrochemical window; “polymer in ceramic” can provide wide electrochemical window but low ionic conductivity. In order to combine the high conductivity of “ceramic in polymer” with the wide electrochemical window of “polymer in ceramic,” we designed multilayer PEO/ Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) composite electrolytes with low content of LLZTO (10wt %) in the inside layer and high content of LLZTO (40wt %) in the surface layer (PCEs-40–10-40) by a simple solution casting method. The PCEs-40–10-40 showed high ionic conductivity(4.61 × 10 –4 \({\mathrm{S}\cdot \mathrm{cm}}^{-1}\) ) and a wide electrochemical window(> 5.1 V) at 60 ℃. Compared with monolayer composite electrolytes, solid-state LiFePO 4 |Li batteries with multilayer composite electrolytes showed much better cycling stability (capacity retention of 98.8% after 200 cycles) at 0.5C and 60 ℃. This work shall give practical insights for the applications of PEO-based composite electrolytes.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米技术
·
高分子科学
✓ 已验证
DOI
高影响因子
Materials
·
2017
·Vol. 10
·期 5
·535
·
IF 2.654
Min Yin,Fang Yang,Zhaojie Wang,Miao Zhu,Ming Liu,Xiuru Xu,Zhenyu Li
One-dimensional SnO2- and Li+-doped SnO2porous nanofibers were easily fabricated via electrospinning and a subsequent calcination procedure for ultrafast humidity sensing. Different Li dopant concentrations were introduced to investigate the dopant’s role in sensing performance. The response properties were studied under different relative humidity levels by both statistic and dynamic tests. The best response was obtained with respect to the optimal doping of Li+into SnO2porous nanofibers with a maximum 15 times higher response than that of pristine SnO2porous nanofibers, at a relative humidity level of 85%. Most importantly, the ultrafast response and recovery time within 1 s was also obtained with the 1.0 wt % doping of Li+into SnO2porous nanofibers at 5 V and at room temperature, benefiting from the co-contributions of Li-doping and the one-dimensional porous structure. This work provides an effective method of developing ultrafast sensors for practical applications—especially fast breathing sensors.Keywords:humidity sensor;electrospun porous nanofibers;lithium doping;response-recovery behavior
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）