JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xin Wu,Jie Zhong,Houji Liu,Yuxi Ren,Haiquan Zhang,Zijing Liu,Ning Wang
Based on the large extraction efficiency of 10–200 μg cm −2 h −1 , the electrolysis-based technology is one of the most promising methods for large-scale extraction of lithium resources from natural seawater. The high potential safety hazard is the inherent defect of the conventional two-electrode electrolytic cell because of the threshold voltage of 3.9 V, which is very close to the decomposition voltage of carbonate electrolytes (4.5–5.0 V). Herein, we designed a novel triple-electrode device, using spinel Li 4 Ti 5 O 12 and 1 M LiPF 6 /FEC + FEMC + HFE respectively as a temporary carrier for storing Li-ions and perfluorinated electrolyte. The threshold voltage of the multi-electrode device is lowered to 2.3 V, which expands the electrochemical window for lithium resource extraction from 1.1 V to 2.7 V. LTO electrode carrier is impossible to electrocatalyze the as-prepared fluoride electrolyte; the compound electrolyte is chemically stable to Li metal as well, avoiding the formation of lithium dendrites . Therefore, the Li 4 Ti 5 O 12 /Li battery exhibits outstanding cycle performances of 99.3% Coulombic efficiency and 95% capacity retention during 250 cycles. Multi-electrode electrochemical devices have shown high safety, stability and extraction efficiency in the practice of extracting Li metal from natural seawater, which is very beneficial to the development of marine mineral resources.
研究领域:
材料科学
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电化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Dalu Li,Xiangxin Zhang,Xiaofei Miao,Yongchuan Liu,Sujing Chen,Yuanqiang Chen,Wei Wang,Yining Zhang
We synthesize the size-tailored Ce:Li 4 Ti 5 O 12 via a facile solid-state method. During the synthesis, a carbon-coating forms in-situ on the Ce:Li 4 Ti 5 O 12 particles to limit their grain growth. The coating is later removed to facilitate the Li + diffusion during charge/discharge. The composition, structure, and morphology of the obtained samples are characterized by powder X-ray diffraction, X-ray photoelectron spectroscopy, inductively coupled plasma elemental analysis , thermal gravimetric analysis , scanning electron microscopy, and transmission electron microscopy . The results confirm the particle-size tailoring effect induced by the carbon-coating. The size-tailored Ce:Li 4 Ti 5 O 12 electrode demonstrates high reversible capacity of 164, 161, 158, 149, 136, and 116 mAh g −1 at 0.5C, 1C, 2C, 5C, 10C, and 20C, respectively, which are significantly improved from the pristine Li 4 Ti 5 O 12 . Moreover, it is also capable of maintaining 96% and 92% of the initial capacity at the high rate of 10C and 20C after 1000 cycles, exhibiting excellent cycling stability. Finally, we fabricate a full cell with LiFePO 4 cathode, which delivers reversible capacity of 110 mAh g −1 at 5C with little capacity fading after 1200 cycles, confirming the outstanding electrochemical performance of size-tailored Ce:Li 4 Ti 5 O 12 anode.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Weikang Mei,Nan Chen,Boyu Wang,Guobao Xu,Hongyu Wang
Methyl acetate (MA) is a suitable solvent for low-temperature electrolyte solutions, but its poor stability against lithium metal is a big problem. Herein, a simple and cheap solution of LiPF6 dissolved in MA was successfully employed for Li4Ti5O12/graphite dual-ion batteries (DIBs). This cell has a long cycle life with 93.1% capacity retention after 1000 cycles. Moreover, it has superior performance at low temperatures (−40 °C) compared to other reported DIBs. The storage behavior of PF6– solvated by MA in graphite cathode has been investigated in detail by in situ X-ray diffraction (XRD) in combination with electrochemical dilatometry (ECD).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Rui Wang,Xiaoyu Cao,Dexing Zhao,Limin Zhu,Lingling Xie,Jingjing Li,Yongxia Miao
The low electronic conductivity of spinel-structured Li4Ti5O12 could be improved by introducing CuV2O6. Herein, several Li4Ti5O12/CuV2O6 composites with different CuV2O6 contents have been successfully prepared by a facile liquid-phase dispersion technique. The amount of CuV2O6 in composites is shown to affect the particle size and electrochemical performances of Li4Ti5O12. The Li4Ti5O12/CuV2O6 composite prepared with a 5 wt % CuV2O6 content (referred to as 5 wt % Li4Ti5O12/CuV2O6) exhibits the best electrochemical performances among all the Li4Ti5O12/CuV2O6 composites. The initial discharge/charge capacities of the 5 wt % Li4Ti5O12/CuV2O6 composite reach 241.1/199.8 mAh g–1 and retain at 136.8/135.7 mAh g–1 over 500 cycles at 30 mA g–1 between 1.0 and 3.0 V. In addition, initial discharge/charge capacities of the 5 wt % Li4Ti5O12/CuV2O6 composite amount to 129.8/90.5 mAh g–1 even at 1200 mA g–1 with maintained discharge/charge capacities of 71.1/71.1 mAh g–1 over 2500 cycles, which are superior to the pristine Li4Ti5O12 in all cases. The detailed electrode kinetic analysis reveals that the introduction of the CuV2O6 phase can enhance the lithium-ion transferring rate and cycling stability of Li4Ti5O12. The enhanced lithium-storage mechanism of the 5 wt % Li4Ti5O12/CuV2O6 composite is clarified by in situ X-ray diffraction (XRD) analysis. The acquired data confirms that in situ formation of small amounts of metallic Cu during discharge/charge processes highly enhance the electronic conductivity and decreases the charge–transfer resistance of Li4Ti5O12. In sum, the as-obtained 5 wt % Li4Ti5O12/CuV2O6 composite has potential for future construction of high-rate and long-lifespan anode materials for Li-ion batteries. The work also provides an innovative route to improve electrochemical performances of Li4Ti5O12.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 5
·6682-6687
·
IF 2.478
Liu Zhenjie,Huang Yudai,Wang Xingchao,Zhang Yue,Ding Juan,Guo Yong,Tang Xincun
High performance and low process cost are two contradictory issues, which limited the commercial application of Li 4 Ti 5 O 12 (LTO). Here, defects and TiO 2 co-enhanced LTO have been synthesized by a simple solid-state method. The crystal structure and morphology of the as-synthesized samples were characterized. The results show that the uniform nanoparticles with spinel structure contained defects and TiO 2 . Defects and TiO 2 co-enhanced LTO shows outstanding reversible discharge capacity of 168.2 mAh g −1 at 1 C after 500 cycles. Further, it presents a stability discharge ability of 155 mAh g −1 at 55 °C at 1 C after 500 cycles. The advanced electrochemical performance could be attributed to the defects and TiO 2 in LTO, which enhance conductivity and produce rich reaction interface, facilitating Li + ion diffusion kinetics. The as-synthesized LTO shows high performance in conjunction with low process cost.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Chengyi Zhu,Jianxiong Liu,Xiaohua Yu,Yingjie Zhang,Xiaodong Jiang,Peng Dong,Yannan Zhang
Spinel LiMn2O4 has attracted increasing interest as promising cathode material owing to its low cost, high safety, and environmental friendliness. But the further development of LiMn2O4 is restricted by fast capacity fading upon cycling, especially at high temperatures. Herein, the one-dimensional (1D) Li4Ti5O12 coated LiMn2O4 nanorods (LMO-LTO) are successfully prepared by combining sol-gel and solid-state calcination method and ultimately enhance the cathode utilization in high-temperature and long-cycling conditions. The as-prepared LMO-LTO cathode delivers a high initial discharge capacity of 128.5 mAh g -1 at 0.1 C rate and exhibits a promising discharge capacity over 74.5 mAh g -1 at 10 C rate. Even under an elevated temperature of 55 O C, it still maintains 74.8% of its initial capacity at 1 C rate. Furthermore, the electrochemical impedance spectra (EIS) measurement confirm that compared with the pure LiMn2O4 nanorod, lower the charge transfer resistance (Rct) and enhanced Li + diffusion coefficient are also strong evidences of the improved electrochemical performance of LiMn2O4 nanorods after Li4Ti5O12 coating.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 6
·060535
·
IF 3.1
Tianzi Liang,Yagang Yang,Hanqing Dong,Kai Yu,Qiushi Song,Zhiqiang Ning,Hongwei Xie
A simple synthesis for the Ti3+-doped, small Li4Ti5O12 is favorable for its application as an anode material of lithium-ion batteries. This study presents a direct synthesis method of high-performance Li4Ti5O12 (LTO-Ti) with the Ti3+ self-doped and uniformly small in size. It is carried out by the redox of an electrochemical electrode pair of Ti and Fe2O3 at a constant potential in molten KCl-LiCl salt with Li2CO3. The synthesis mechanism and the effect of synthesis conditions on the formation and properties of LTO-Ti were investigated in detail. The LTO-Ti with an average size of approximately 400 nm is prepared by the ionic level synthesis method, and exhibits a superior specific capacity of 130.5 mAh·g−1 at 10 C current density, which is 73.6% of its average specific capacity at 1 C. Moreover, it also shows good cycling stability with a specific capacity of 127.2 mAh·g−1 after 1000 cycles at 5 C (capacity retention of 96.9%). This synthesis is secure and prospective.
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 THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 11
·5934-5945
·
IF 3.784
Zhenya Wang,Hao Guo,De Ning,Xiaobai Ma,Lirong Zheng,Dmitry Smirnov,Kai Sun,Dongfeng Chen,Limei Sun,Xiangfeng Liu
Li 4 T i5 O 12 (LTO) attracts great interest due to the “zero strain” during cycles but the poor electronic and ionic conductivity critically impede the practical application. Herein, we report a synergy strategy of tuning localized electrons to shift Fermi level and band gap by Mg/Zr co-doping and oxygen vacancy incorporation, which significantly improves Li + and electronic transport. More importantly, the intrinsic synergistic mechanism has been revealed by neutron diffraction, X-ray absorption spectra, and first-principles calculations. The “elastic effect” of lattice induced by Mg/Zr co-doping allows LTO to accommodate more oxygen vacancies to a certain degree without a severe lattice distortion, which largely improves the electronic conductivity. Mg/Zr co-doping and oxygen vacancy incorporation effectively enhanced the dynamic characteristics of LTO electrode, achieving the excellent rate performance (90 mAh/g at 20C) and cycle stability (96.9% after 500 cycles at 10C). First-principles calculations confirm Fermi level shifts to the conduction band, and the band gap becomes narrowed due to the synergistic modulation, and the intrinsic mechanism of the enhanced electronic and Li-ion conductivity is clarified. This study offers some insights into achieving the fast Li + insertion/extraction by tuning the crystal and electronic structure with lattice doping and oxygen vacancy engineering.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Tianyu Zhu,Cuiping Yu,Yang Li,Rui Cai,Jiewu Cui,Hongmei Zheng,Dong Chen,Yong Zhang,Yucheng Wu,Yan Wang
Li 2 O-2B 2 O 3 (LBO) ionic conductor with high conductivity plays an important role in boosting the rate performance and cycling stability of Li 4 Ti 5 O 12 (LTO) anode for lithium-ion batteries by preventing direct exposure of LTO to the electrolyte. Herein, the effect of LBO coating layer on lithium ion (Li + ) storage performance is investigated in detail by adjusting the adding amount of LBO precursor dispersion. LTO coated with 2 wt% LBO achieves an optimum performance with a specific capacity of 172.9 mA h g −1 at a current density of 0.1 A g −1 , an improved rate capability (specific capacity of 127.9 mA h g −1 is maintained when the current density is 20 times than 0.1 A g −1 ) and a remarkable cycling stability (capacity retention of 94.2% after 4000 cycles at 2.0 A g −1 ). These LBO-LTO composites are competitive and promising candidates for electrochemical energy storage and other applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Ying Zhang,Jun Li,Fan Zhang,Xiao Li,Baige Yuan,Manman Xia,Peng Zhao,Ruyan Lei
Doping elements play an important role in improving the conductivity of Li 4 Ti 5 O 12 used as anode materials for lithium ion batteries . In this work, nanoparticles of Li 4-X Ca x Ti 5 O 12 (x = 0, 0.03, 0.05 and 0.07) were successfully synthesized through a facile hydrothermal method followed by calcination . The evolution in microstructure as well as electrochemical performance of the modified samples with the doped Ca content were investigated in details. It was found that modified Li 4-x Ca x Ti 5 O 12 (x = 0.05) exhibited the best electrochemical performances in terms of the highest initial specific discharge capacity (158.55 mA h g −1 at 160 mA g -1 ), best cycling stability with a retained specific charge capacity of 104.76 mAh g −1 at 160 mA g -1 after 100 cycles and rating capability with a retained rate of 64.55 %/88.56 % with the current density drastically increased 1600 mA⋅ g −1 and dropped to initial value. The excessive introduction of Ca (x = 0.07) caused the sharp decrease in electrochemical performance due to the formation of inert and insulating CaCO 3 . Li 4-x Ca x Ti 5 O 12 (x = 0.05) also demonstrated a lowest ohmic resistance (2.35 Ω) and charge transfer resistance (95.42 Ω).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Fuyun Li,Min Zeng,Jing Li,Hui Xu
Mg-doped Li4Ti5O12 nanoparticles with a grain size of around 200 nm were synthesized successfully using a simple solid-state reaction route. The effects of Mg 2+ doping on Li4Ti5O12 were systematically investigated by XRD, XPS, TEM, HRTEM and EDS. These indicated that Mg ions were uniformly dispersed into Li4Ti5O12 lattice and Mg 2+ doping during sintering can effectively inhibit the growth of Mg-doped Li4Ti5O 12 particles without changing the structure of Li4Ti5O 12 . The charge-discharge cycling tests and EIS analysis were conducted to study their electrochemical performance. The initial discharge capacity of the Mg-doped Li4Ti5O12 electrodes was 190mAhg -1 at 1 C and the discharge capcity of 179mAhg -1 was retained after 100 cycles. Moreover, the discharge capacity of 150mAhg -1 was maintained even at a high rate of 5 C after 100 cycles, whereas the undoped electrodes only exhibited a capacity of 134mAhg -1 under the same condition. The excellent electrochemical performance of doped electrodes can be ascribed to the unique properties of nanomaterials and excellent electrical conductivity due to Mg 2+ doping.
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 Materials Chemistry A
·
2017
·Vol. 5
·期 22
·10902-10908
·
IF 8.867
Yao Liu,Jingyuan Liu,Mengyan Hou,Long Fan,Yonggang Wang,Yongyao Xia
Sodium-ion batteries have been considered as promising alternatives to the current lithium-ion batteries owing to their low cost and abundant raw material. The major challenge of their practical implementation is the lack of favourable anode material. Spinel Li4Ti5O12 has been regarded as a potential anode material for its superior capability of sodium-ion storage and relatively appropriate operating voltage. However, the low intrinsic ionic and electronic conductivity of spinel Li4Ti5O12 still remains as its major drawback. Herein, carbon-coated Li4Ti5O12 nanoparticles have been synthesized through a solid-state reaction and a chemical vapour deposition method and used as an anode material for sodium-ion battery. The composite structure demonstrates excellent stability and an initial discharge specific capacity of 120.1 mA h g−1, which is maintained at 101.5 mA h g−1 after 500 cycles corresponding to 85% of capacity retention at a current density of 0.1 A g−1. In addition, a full cell was fabricated with carbon-coated Na3V2(PO4)3 as a positive electrode, which displayed discharge specific capacities of 138.5 mA h g−1 that was maintained at 114.7 mA h g−1 after 50 cycles at a current density of 0.05 A g−1, and the capacity retention was 82.8%. The results indicated that the Li4Ti5O12 nanoparticle with a carbon layer shows a promising electrochemical performance as anode materials in sodium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）