ELECTROCHIMICA ACTA
·
2011
·
IF 3.65
Qin Hao,Houyi Ma,Zhicheng Ju,Guangda Li,Xiaowei Li,Liqiang Xu,Yitai Qian
LiCoO 2 nanoparticles were prepared through a sol–gel method, and then appropriate amount of CuO nanoparticles were deposited onto their surfaces to improve their cycling performances. It is found that the CuO coated sample has the capacity retention higher than 90% at the rates below 30 C after 10 cycles, which also has the highest capacities of 135 and 123 mAh g −1 at 40 C (5480 mA g −1 ) and 50 C (6850 mA g −1 ), respectively. The cyclic voltammograms result reveals that the CuO coating reduces the polarization and improves the electrochemical activity of cathode. In addition, experimental results indicate that CuO coating plays an important role in reducing the charge transfer resistance of the cell during cycling, which has been demonstrated by the electrochemistry impedance spectroscopy analysis. The above data indicate the potential application of CuO coated LiCoO 2 in high power field.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
J.P. Mwizerwa,K. Xu,C. Liu,N. Zhao,Y. Li,P. Ndagijimana,Z. Chen,J. Shen
Currently, the development of high-performance lithium-ion batteries (LIBs) with improved areal capacity is still challenging. The common strategy to improve areal capacity is to increase the thickness of electrode materials. However, the application of thick electrodes remains challenge due to poor mechanical properties , slow charge and ion transport, and poor electrolyte infiltration . In this study, thick electrodes are constructed by 3D printing a Li 4 Ti 5 O 12 @VSe 2 -based ink. The highly electrical conductor VSe 2 on the Li 4 Ti 5 O 12 surface improves the ion and charge transport and eases the internal resistance of the 3D-printed electrode during charge and discharge. As a result, LIBs employing these thick electrodes show a high-rate capability of 128.9 mAh/g at 10 C, improved areal capacities up to 6.2 mAh/cm 2 , and ultrastable cycling capability (84.5% of capacity retention after 1700 cycles). Moreover, full cells utilizing 3D-Li 4 Ti 5 O 12 @VSe 2 as the anode and 3D-LiFePO 4 @AC/rGO as the cathode with 1.81 V potential yield a high specific capacity of 152.5 mAh/g at 0.1C, a high specific energy density of 276.025 Wh/kg, and a power density of 30.5 W/kg at 0.1C. This work paves the way to designing thick electrodes for high-performance LIBs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zunbin Duan,Xiaoxiao Feng,Gengchang Lai,Danni Liu,Xiaoyi Zhang,Haoyu Wang,Shuen Chen,Xingchen He,Zihui Liu,Liping Tong,Huaiyu Wang,Xue-Feng Yu,Jiahong Wang
Phosphorus anode has shown great potential for the high-rate and high-energy–density lithium-ion batteries. Nevertheless, it still suffers from possible electrode cracking, ion-transport restrictions, and active-particle decomposition resulting from repeated alloying/de-alloying. To address the aforementioned issues, a nitrogen-doped flower-like porous phosphorus (f-P) sphere has been developed. The abundant micro-mesopores facilitate ion diffusion and enhance the internal bonding strength of the electrode. Concurrently, the doped nitrogen promotes the generation of a favorable solid electrolyte interphase constructed by fast-ion-conductors. As a result, the f-P exhibits a high-rate capacity of 735mAh g −1 at 20 A g −1 and maintains high Coulombic efficiencies over 900 cycles at 10 A g −1 . Furthermore, coin full-cells comprising the f-P anode and lithium cobalt oxide cathode demonstrate stable operation at a high current density of 6 mA cm −2 . The combination of a porous structure and doping strategy represents a viable approach for strengthening the durability of electrodes and optimizing the ion transport kinetics of advanced alloy anode materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 3
·1148-1156
·
IF 3.442
Chen He,Yu Lanyong,Lin Zifeng,Zhu Qizhen,Zhang Peng,Qiao Ning,Xu Bin
MXenes are 2D transition metal carbides or nitrides with high electrical conductivity that have attracted great attention as promising electrode materials that supersede carbon-based material designed for supercapacitors. However, the aggregation and self-restacking of MXene 2D nanosheets limit their high-rate performance. In this work, flexible and conductive Ti 3 C 2 T x MXene/carbon nanotubes (CNTs) composite film was prepared through a simple vacuum filtration of the Ti 3 C 2 T x MXene and CNTs suspension mixture. The CNTs integrated MXene nanosheets can effectively prevent the restacking while creating fast ion transport channels for enhanced capacitance. The designed films exhibit excellent performance as supercapacitor electrodes with high capacitance of 300 F g −1 at 1 A g −1 with superior rate performance of 199 F g −1 even at 500 A g −1 , together with excellent cyclic stability of 92% capacitance retention after 10000 cycles at 20 A g −1 . The excellent workability demonstrates potential application of the system for flexible, portable and highly integrated supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 8
·3001-3012
·
IF 2.8
Tang Haoqing,Zhao Siying,Weng Qiang,Liu Tao,Tang Zhiyuan,Liu Xiaotong
A novel strategy to improve the ionic conductivity of the Li 2 ZnTi 3 O 8 (LZTO) anode is proposed by embedding exfoliation and exchange of Li + montmorillonite (MMT) in LZTO particles. Li 2 ZnTi 3 O 8 and montmorillonite (LZTO-MMT) composites are shown to induce not only a high concentration of Li + in the interlamellar channel of MMT but also a reduction in the distance for Li + migration to ensure fast and stable Li + diffusion kinetics. Furthermore, the thus obtained LZTO and 6 wt% MMT (LZTO-6MMT), composed of fast Li + conductor MMT, exhibits increased Li + conductivities, excellent high-rate Li + storage capacities, and significant improvement in cycle reversibility. The LZTO-6MMT electrode delivers 219.6 mAh g −1 at a current density of 1.0 A g −1 after 500 cycles and shows an excellent high-rate performance of 127.8 and 112.0 mAh g −1 over 2000 cycles at 5.0 and 10.0 A g −1 , respectively. X-ray photoelectron spectroscopy and ex situ Raman spectrum analyses suggest that the chemical bonds and crystal structure remain stable after multiple Li + intercalation/deintercalation processes. To the best of our knowledge, this is the first report on the introduction of fast-ion conductor MMT into LZTO and its application to lithium-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Kaite Peng,Xiaoyan Wang,Zhiyong Wang,Xianbo Jin
Advanced thermal batteries require new cathode materials with high thermal stability, high capacity, high voltage, and high-rate performance. Although antimony sulfide (Sb 2 S 3 ) has a high theoretical capacity, its low melting point characteristic hinders the application in thermal batteries. Here, we demonstrate that modifying with a small amount of graphite can effectively immobilize liquid Sb 2 S 3 to form a pellet electrode, which allows us to use cathodes made of this liquid active material just like traditional solid-state electrodes. The formation of such a solid-like liquid cathode can be attributed to graphite's affinity for Sb 2 S 3 while repelling the molten electrolyte. The electrochemical testing in LiCl-KCl eutectic at 560 °C and 600 °C indicates that, the performance of the graphite modified Sb 2 S 3 (gra@Sb 2 S 3 ) of optimized proportions far surpasses that of traditional FeS 2 , both in terms of discharge capacity and thermal stability. This study provides a strategy for developing new kind of liquid cathode materials for high-performance thermal batteries.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Gaobang Chen,Yong Fan,Tianhui Yu,Muhammad Shoaib,Azim Khan,Yifan Liu,Xian Jian
The practical application of high-rate lithium/fluorinated carbon (Li/CF x ) primary batteries faces challenge of relatively slow electrode reaction kinetics limited by inert C-F bond and strong polarity. Herein, an effective microwave-induction strategy was developed to regulate C-F bond for 80C high-rate Li/CF x battery with suppressed polarization. The as-mentioned microwave method was carried out in the alcohol-based solvent for uniformly modify CF x , including precise defluorination, C-F bond regulation, surface functional groups and carbon quantum dots. Precise defluorination contains the conversion of C-F bond to semi-ionic C-F bond while preserving C-F 2 and C-F 3 . During the process of C-F bond regulation, hydroxyl groups is grafted onto the surface of CF x to increase the wettability and electronegativity of the electrode. Compared with raw CF x , the Li/CF x batteries using microwave-modified CF x achieved high discharge rate of 80C possessing a high power density of 134.091 kW/kg. In addition, the optimal Li/CF x battery possesses a large specific capacity increase ratio of 142.6 % at 50C. This microwave-induction approach for modifying CF x in ethanol-based solvent provides a facile and effective pathway to design high-rate Li/CF x battery.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Yifei Chen,Meng Li,Qin Zhu,Wei Bai,Xiaofang Liu,Mingwu Xiang,Junming Guo,Jintao Liu
The Jahn-Teller effect and Mn dissolution always restrict the practical electrochemical properties of spinel LiMn 2 O 4 cathode material. Herein, a low-temperature solid-state combustion method is employed to synthesize various truncated octahedral LiZn 0.03 Al x Mn 1.97- x O 4 ( x ≤ 0.08) with submicron structure. The Zn/Al dual-doping is conducive to forming {110} and {100} planes, and is also beneficial to the crystal development of LiMn 2 O 4 . It is found that as the amount of Al doping increases, the average particle size gradually decreases from 188 nm to 113 nm. In addition, the Zn/Al co-doping integrated with small particles can improve the high-rate performance. The optimal LiZn 0.03 Al 0.03 Mn 1.94 O 4 exhibits submicron truncated octahedral morphology, high crystallinity , and good particles dispersibility . Benefiting from these structure merits, the LiZn 0.03 Al 0.03 Mn 1.94 O 4 delivers the first discharge capacity of 113.1 mAh⋅g −1 and low capacity fade of 9.9 % after 300 cycles at 1C. It also shows the high first discharge capacity of 86.6 mAh⋅g −1 at 10C and the high capacity retention of 72.1 % after 2000 cycles. Even at ultrahigh current density of 15C and 20C, the ultralong cycling lifespans over 2000 cycles are also achieved in LiZn 0.03 Al 0.03 Mn 1.94 O 4 cathode material. The excellent electrochemical properties are ascribed to its relatively high Li + diffusion coefficient (1.60 × 10 −11 cm 2 ⋅s −1 ) and low apparent activation energy (25.45 kJ⋅mol −1 ) during the de-intercalation process. The Zn/Al dual-doping and submicron truncated octahedron designs of the LiMn 2 O 4 provide a scientific reference to prepare high-performance cathode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Suwei Mou,Kai Huang,Min Guan,Xiang Ma,Jun song Chen,Yong Xiang,Xiaokun Zhang
LiCoO 2 is the dominantly used cathode material in lithium-ion batteries. However, its high-rate capacity and cyclability are limited, especially under high charging voltages, mainly due to the high Li + diffusion barrier . To solve it, we purpose a doping scheme based on two foreign elements: one is with tremendously large ionic radius and weak electronegativity , and the other one has an ionic radius slightly larger than Co, an electronegativity a little weaker than Co, and a high binding energy with O. Ba and Ga are chosen according to this criterion, and their doping effects are compared with that of La and Al. Briefly, Ba is superior to La in weakening the attraction of O 2- to Li + because of its weaker electronegativity and larger ionic radius. Meanwhile, Ga is more capable of enhancing the structural stability at high voltages than Al mainly due to its higher binding energy with O. LiCo 0.998 Ba 0.001 Ga 0.001 O 2 increases Li + diffusivity from 0.77 × 10 -14 to 1.06 × 10 –13 cm 2 ∙s -1 , resulting in a significantly enhanced rate capacity of 114.3 mAh g -1 at 10 C, much better than pristine counterpart (1.6 mAh∙g -1 ). Additionally, it exhibits a particularly high capacity of 199.3 mAh g -1 , and 85% capacity retention over 100 cycles at 0.5 C in 3.0–4.5 V.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Bo Long,Youlan Zou,Zhaoyang Li,Haiyan Zou,Hengyue Chen
Silicon (Si) with high energy density is identified as the most promising candidate for commercial lithium-ion batteries anodes. Unfortunately, the volume expansion severely damages the battery cycle life during cycling, resulting in fast capacity fading during the battery operation. Herein, a facile design was proposed for the preparation of novel tailored mesoporous Si cages (TMSC) to mitigate this issue. The TMSC material, with mesoporous anamorphic spherical shells and nano-sized Si cores, consists of numerous interconnected channels and forms a half open three-dimensional network. When evaluated as electrode material for lithium-ion batteries, it exhibits the reversible capacity of 931.1 mAh/g after 200 cycles at 1 A/g, which is more stable than that of Si pomegranates with intact shells. Moreover, it displays a high rechargeable capacity of 552.3 mA h/g over 500 cycles at 4 A/g and the capacity decay ratio is only 0.11% for each cycle.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2022
·Vol. 15
·期 4
·1669-1675
·
IF 8.307
Xiao Liu,Shuai Zhang,Peng Zhang,Zongmin Zheng,Feng Bai,Qi Li
Tin dioxide (SnO2) with a high theoretical capacity of 1494 mA h g−1 has great potential to break through the capacity limitation of the conventional graphite anode (372 mA h g−1) in lithium-ion batteries. However, its practical application still faces several obstacles such as high volumetric expansion and poor electrical conductivity. To solve these problems, innovative design and synthesis of SnO2-based nanocomposite structures are necessary. Herein, we demonstrate an integrated design of a hierarchical pitaya-like P-SnO2/C@NC core–shell nanostructure which includes the core of SnO2 nanoparticles (∼4–12 nm) uniformly embedded in the porous carbon sphere and the shell of a continuous nitrogen-doped carbon (NC) layer. Specifically, during repetitive lithiation and delithiation processes, the ultrasmall SnO2 nanoparticles reduce the internal stress greatly, the porous carbon matrix provides buffer space for a large volume change, and the N-doped carbon shell further guarantees the whole structure unit sufficient electrical conductivity and structural stability. Consequently, the resultant battery exhibits a reversible capacity of 936.8 mA h g−1 after 100 cycles at 100 mA g−1 and even an average capacity of 460.0 mA h g−1 at a high current density of 3.2 A g−1. The excellent electrochemical performance of pitaya-like SnO2/C@NC proves the efficacy of this structure design and thus provides significant reference for the construction of other electrode materials in rechargeable alkali metal ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）