Energy Materials
·
2023
·Vol. 3
·期 1
·N
·
IF 0
Xin Liang,Dongqing Zhao,Lulu Wang,Qianqian Huang,Chonghai Deng,Lili Wang,Lei Hu,Sheng Liang,Huaxia Deng,Hongfa Xiang
A gelatin-based nanofiber separator doped with C60 and ZIF-67 was constructed by electrostatic spinning of two different solutions. It can be used as a multifunctional separator for Li-S batteries.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
·
高分子材料
✓ 已验证
DOI
RARE METALS
·
2020
·Vol. 40
·期 8
·2049-2058
·
IF 2.161
Fu Rong,Hu Yan-Yan,Qiao Hui-Na,Yang Chun-Lin,Yin Hao,Ou Mei-Gui
Gd 2 O 3 :Tb 3+ nanocrystal co-doped with Zn 2+ and Li + was prepared by the combination of polyol and solid-phase methods. The synthesized nanoparticles were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), photoluminescence (PL) spectra and magnetic resonance imaging (MRI). The results revealed that both Gd 2 O 3 :Tb 3+ /Zn 2+ and Gd 2 O 3 :Tb 3+ /Li + had cubic unit structures with a spherical shape, and the fluorescence intensity of the nanoparticles reached a maximum at a doping concentration of 0.050 mmol% for Zn 2+ and 2 mol% for Li + , respectively. In addition, the T 1 / T 2 (longitudinal/transverse relaxation time)-weighted MRI signals got enhanced due to the increased longitudinal relaxivity ( r 1 ) and transverse relaxivity ( r 2 ) after the doping by metal ions. Therefore, the materials reported here can be used for fluorescence and MR bimodal imaging, as tracers and for fluorescence detections. Graphic abstract
研究领域:
材料科学
·
纳米医学
·
生物影像学
·
分子探针
·
生物材料
✓ 已验证
DOI
高影响因子
SOLID STATE IONICS
·
2021
·
IF 3.785
Bo Fan,Zebo Guan,Hongjiao Wang,Lilin Wu,Wenzhi Li,Shibang Zhang,Bai Xue
Understanding the electrochemical processes in all-solid-state lithium‑sulfur batteries is essential for designing high-performance devices. Here, the evolution of the electrochemical impedance spectra of an all-solid-state lithium‑sulfur battery during one charge/discharge cycle was quantitatively investigated with a reasonably established equivalent circuit. The impedance spectra could be decomposed into several parts as follows: the bulk resistance of solid electrolyte and current collector at highest frequency, three semicircles from high to low frequency corresponding to the dynamic processes at different interfaces and a 45° straight line followed by an inclined small tail at low frequency. It is found that the middle frequency semicircle, corresponding to charge transfer at the cathode, varied obviously during the charge/discharge cycle. Moreover, the 45° straight line, which is attributed to the Li diffusion in the cathode material Li x S based on qualitative analysis, dominates the impedance spectra, revealing that the main kinetics-limiting factor is the Li diffusion in the active materials. Finally, an electrochemical model of the battery is proposed which provides insight for the designing of high-performance all-solid-state lithium‑sulfur batteries.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hang Che,Yuhao Wu,Xinhua Wang,Haizhen Liu,Mi Yan
The Mg(NH 2 ) 2 -2LiH system is considered as one of the most potential hydrogen storage materials due to its high hydrogen storage capacity (5.6 wt%) and excellent reversible hydrogen adsorption and desorption performance. However, its poor kinetic characteristics of hydrogen absorption and desorption limit its practical application. In this work, Li 3 VO 4 @LiVO 2 was synthesized by a hydrothermal method , and was then introduced into Mg(NH 2 ) 2 -2LiH system to enhance the hydrogen absorption and desorption kinetic characteristics. The results show that the hydrogen storage properties were greatly improved with addition of 10 wt% Li 3 VO 4 @LiVO 2 addition. As for the hydrogen absorption and desorption kinetics, the average hydrogen absorption rate of 10 wt% Li 3 VO 4 @LiVO 2 modified Li-Mg-N-H sample within 20 min at 200 ℃ increased by 95.2% compared with that of the pristine Li-Mg-N-H sample, and the average hydrogen desorption rate of 10 wt% Li 3 VO 4 @LiVO 2 modified sample within 30 min at 180 ℃ increased by 42% compared with that of the pristine sample. The E a of hydrogen desorption decreased from 117.86 kJ/mol to 99.43 kJ/mol, which also indicates that Li 3 VO 4 @LiVO 2 catalyst effectively improved the kinetic performance of hydrogen desorption and desorption of Li-Mg-N-H. Moreover, the hydrogen desorption capacity and hydrogen absorption capacity of 10 wt% Li 3 VO 4 @LiVO 2 modified Li-Mg-N-H increased by 18.4% and 13.8% compared with that of the pristine sample. The catalytic mechanism of Li 3 VO 4 @LiVO 2 was discussed based on XRD , XPS and FTIR analysis results.
✓ 已验证
DOI
高影响因子
Applied Materials Today
·
2022
·
IF 8.663
Yaxiong Yang,Shugang Liu,Zhe Dong,Zhenguo Huang,Cheng Lu,Yongjun Wu,Mingxia Gao,Yongfeng Liu,Hongge Pan
Microsized silicon powders have great potential for high capacity anode materials in next-generation lithium ion batteries, because of the high gravimetric and volumetric energy densities, ease of mass production and low costs. However, large volume change and consequently rapid capacity fading upon lithiation and delithiation prevent its practical applications. Herein, we demonstrate an effective hierarchical conformal coating strategy for high-performance microsized Si anodes. The Si-based composites consist of an amorphous Li-Si-O inner coating layer and a graphene outer encapsulation layer, which are prepared by coupling reactive milling with electrostatic self-assembly. This unique hierarchical conformal coating structure not only strengthens the mechanical property (31.8 GPa for the elastic modulus) and promotes the ionic diffusion (2.03 × 10 −10 cm 2 s −1 ) of Si anode, but also effectively stabilizes the electrode/electrolyte interfaces and increases the electronic conductivity. As a result, a high reversible capacity (1450 mA⋅h g −1 at 0.1 A g −1 ), good cycling stability (97.7% of capacity retention from the 2nd to the 310th cycle at 0.5 A g −1 ), and high rate capability (703 mA⋅h g −1 at 5 A g −1 ) have been successfully achieved. These findings provide new insights into the improvement of electrochemical properties of microsized Si composite anodes for high-performance Li-ion batteries.
✓ 已验证
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2021
·Vol. 32
·期 7
·2493-2501
·
IF 4.833
Hongling Yi,Lei Tan,Lingfeng Xia,Lingjun Li,Hongxing Li,Zengsheng Liu,Chu Wang,Zixiang Zhao,Junfei Duan,Zhaoyong Chen
The well-established LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) cathode materials possess a broad prospect for Li-ion batteries. However, the NCM523 still suffers severe capacity fading and structural instability. In this research, Ce-doped and CeO 2 -coated NCM523 cathode materials are synthesized by a smart one-step calcination process. It is found that the CeO 2 coating layer is formed during high-temperature calcination. The CeO 2 coating layers stop the electrode from being exposed to the electrolyte directly and promote the kinetics of lithium deintercalation. Besides, Ce doping could suppress the bulk cation-mixing degree. Electrochemical tests suggest that Ce-modification improves the capacity retention of cathode materials. The optimized Ce-modification cathode material, among 2.7 V and 4.6 V, not only shows the best capacity retention of 76.2%, but also delivers a discharge capacity of 178.2 mAh g −1 at 1 C. This smart modification strategy provides novel ideas for advanced LIBs.
✓ 已验证
DOI
高影响因子
APPLIED ENERGY
·
2016
·
IF 5.746
Dongbin Xiong,Xifei Li,Hui Shan,Bo Yan,Dejun Li,Craig Langford,Xueliang Sun
It is highly desirable to develop high-performance and cost-effective cathode materials for lithium-ion batteries (LIBs). In this work, functionalized graphene nanosheets (FGNS) were facilely synthesized utilizing ethylene glycol as both reducing agent and solvent. When employed as cathode materials for LIBs, FGNS were demonstrated to exhibit superior electrochemical performance when compared with traditional metal oxide-based cathodes. For instance, FGNS deliver outstanding cycle stability and high specific discharge capacity of 280 mA h g −1 at 0.05 A g −1 without obvious capacity fading after 300 cycles. Furthermore, FGNS reveal high rate capacity of 152 mA h g −1 at a high current density of 0.4 A g −1 . The excellent electrochemical performance is attributed to the oxygen-containing functional groups and specific poriferous structure of FGNS. The proposed FGNS are expected to be a simple, low-cost, efficient, and large-scale production of cathode materials for LIBs.
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 100
·56701-56706
·
IF 3.708
Wei Wei,Sen Gao,Zhao Yang,Lin Guo
In this work, we designed a novel cathode material, porous micro-spherical LiFePO4/graphene nanocomposites with low graphene content, via a hydrothermal route followed by a lithiation process. The nanocomposites consist of LiFePO4 microspheres (∼3 μm) with their primary particles (∼100 nm) sandwiched between layers of graphene nanosheets. Mesopores (∼25 nm) are widely present in the microspheres. TGA analysis indicates that only 2.65% graphene was loaded in the composites. When studied as a cathode material for Li-ion batteries, with the absence of a conductive agent, the nanocomposites can display a high capacity of 118.2 mA h g−1 at 20 C.
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2021
·Vol. 64
·期 6
·1378-1385
·
IF 8.273
Fu Yuanyuan,Ma Cheng
The interplay between solid electrolytes and electrodes is of vital importance to the performance of all-solid-state Li batteries. Recently, halide superionic conductors have emerged as a new family of high-performance solid electrolytes, but their compatibility with Li metal, i.e., the anode with the highest theoretical capacity, has not been systematically studied. Here, we investigate the interaction between Li metal and two representative halide solid electrolytes: Li 3 YCl 6 and Li 3 YBr 6 . Both materials are found to form interphases with Li, similar to most solid electrolytes. However, the interphases observed here contain electronic conducting components, which are detrimental to their compatibility with Li. By elucidating this phenomenon, the present study provides guiding principles for improving the Li compatibility of halide solid electrolytes.
研究领域:
材料科学
·
电化学
·
固态离子学
·
能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
Energy & Environmental Materials
·
2022
·Vol. 6
·期 5
·e12415
·
IF 13.443
Lin Chen,Jingwen Zhou,Junxiang Zhang,Guicai Qi,Bin Wang,Jianli Cheng
High energy density Li-CO 2 batteries have attracted much attention owing to the “two birds with one stone” feature in fixing greenhouse gas CO 2 and providing renewable energy. However, poor reversibility of the discharge product Li 2 CO 3 is one of the main problems that limit its application, resulting in poor cycling stability and severe polarization. Herein, copper indium sulfide (CIS), a semiconducting non-precious metal sulfide, is fabricated as cathode catalysts for high-performance Li-CO 2 batteries. Combined with the synergistic effect of bimetallic valence bonding and coordinated electron transfer, Li-CO 2 batteries using CIS cathodes exhibit high full specific discharge capacity, excellent rate capability and cycle stability, namely it delivers a high specific full discharge capacity of 8878 μAh cm −2 , runs steadily from 10 to 100 μA cm −2 , and performs a stable long-term cycling behavior (>1050 h) under a high energy efficiency of 84% and a low charge voltage of approximately 3.4 V at 20 μA cm −2 within 100 μAh cm −2 . In addition, a flexible Li-CO 2 pouch cell is constructed to reveal the potential of employing CIS to fabricate flexible high energy storage devices in practical applications. This work shows a promising development pathway toward next-generation sustainable energy storage devices.
研究领域:
电化学
·
能源材料
·
纳米催化
·
可持续能源存储
·
金属-气体电池
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·Vol. 45
·期 8
·10633-10639
·
IF 3.45
Guorong Hu,Zhichen Xue,Zhongyuan Luo,Zhongdong Peng,Yanbing Cao,Weigang Wang,Yuexi Zeng,Yong Huang,Yong Tao,Tianfan Li,Zhiyong Zhang,Ke Du
The Li-rich cathode material for long cycle performance and long-term storage performance is a challenge for next-generation lithium-ion batteries due to the rapid capacity degradation over cycling and the formation of residual lithium on the surface during long-term storage. Herein, an elevated performance of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 materials via CeO 2 inlay is reported, which was prepared from Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 by sol-gel inlay with CeO 2 . It was proved by scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy that cerium oxide cladding not only covered the surface of the material but also diffused into the interior of the material change crystal structure. Cerium oxide on the cladding not only reduces the material's contact with water and carbon dioxide in the air, but also prevents the material from being corroded by electrolyte during electrochemical test. The position of the transition metal atom is replaced Ce atoms, which increases the unit cell volume and the stability of the Li-rich material during the cycling. The results show that the storage property and the electrochemical cycling property of the material have been improved obviously. The CeO 2 inlaid lithium rich material discharged 204.6 mAh/g for the first time at the current of 1C, and 164.4 mAh/g after 150 charge and discharge cycles with corresponding capacity retention rate of 80.35%, compared with the retention rate of 57.26% for pristine Li-rich material capacity. After being stored in humid air for 40 days, the CeO 2 inlaid lithium-rich material showed better electrochemical performance than the pristine one. It is powerfully demonstrated that the CeO 2 inlay strategy here holds huge promise for surface modification of electrode materials for lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
锂离子电池
·
能源存储
·
无机非金属材料
✓ 已验证
DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 11
·4943-4947
·
IF 2.961
Li Ze,Li Yonghua,Xie Huan,Zuo Zhaoyang,Chu Peng
As a kind of anode materials, iron matrix oxide cannot be widely used in the lithium-ion batteries due to their poor electrical conductivity and huge volume change during the electrochemical cycles. Herein, the porous carbon@Fe 2 O 3 composites are prepared by hydrothermal method. Due to the porous structure and introduction of carbon, the electrical conductivity can be greatly improved. Additionally, the porous structure could buffer the volume change during electrochemical cycles. As a result, the as-prepared carbon@Fe 2 O 3 composites deliver a high initial specific capacity of 1168 mAh/g at 0.1 C. Moreover, the carbon@Fe 2 O 3 composites show outstanding rate performance and superior cycling stability. This work provides a potential anode material for high electrochemical performance Li-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）