Micro & Nano Letters
·
2020
·Vol. 16
·期 1
·39-43
·
IF 0.975
Yawen Zhang,Yilu Bai,Lanlan Ye,Ting Li,Rui Chen,Hong Jin,Hongyan Xia,Hui Xu
In order to improve the rate performance and reduce the cost lithium ion anode, the Li 4 Ti 5 O 12 @TiO 2 (LTO-TO) was prepared by a facile hydrothermal reaction method with a micro-scale TiO 2 as the precursor. The morphologies and microstructures of the pomegranate-like LTO-TO were examined by scanning electron microscopy and transition electron microscopy. The results demonstrate that the nano-LTO particles are located on the surface of the micro TiO 2 . The electrochemical properties of the LTO-TO composites were characterized by galvanostatic charge/discharge. The as-prepared composites present a high capacity of 157.3 mAh g −1 at 0.5 C. Even at a high current density of 10 C, it can still maintain a high capacity of 105.4 mAh g −1 and remains 92.8% (95 mA g −1 ) after 450 cycles. These results indicate that the as-prepared LTO nano/micro-sphere may be a potential anode material for lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 39
·20650-20657
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IF 11.301
Ruiyi Gan,Yiling Liu,Na Yang,Cheng Tong,Mingming Deng,Qin Dong,Xianyi Tang,Na Fu,Cunpu Li,Zidong Wei
Li metal anodes, which possess ultrahigh theoretical capacity, are considered the ultimate solution for high energy density batteries. However, issues regarding safety and rapid electrode degradation due to Li dendrite growth have restricted the commercialization of Li metal anodes for several decades. Herein, a stable, dendrite-free Li metal anode with a hairy-layered architecture is reported, which is realized though a facile electrochemical deposition of Li on a lithiophilic LTO/Ti3C2 composite. The simultaneous formation of the lithiophilic composite could induce the uniform deposition of Li ions and acted as an interlayer skeleton for the intercalation of Li ions. A microscale uniform electric field could also be formed to regulate the Li-ion deposition behaviour. Thus, the growth of dendrites could be inhibited, the formation of dead Li could be prevented, and a stable, long-life Li metal anode could be realized. The obtained Li/LTO/Ti3C2/Cu electrode could reversibly charge/discharge for 2000 h with a high current of 1 mA cm−2 and an ultralow voltage hysteresis of 20 mV. Full batteries with the Li/LTO/Ti3C2/Cu anode exhibit excellent electrochemical performance. This work provides a promising anode design strategy for the fabrication of high-performance and safe Li metal batteries.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Chemistry
·
2022
·
IF 3.241
Yingchun Xie,Yilin Zhang,Jiayu Qin,Murodjon Samadiy,Tianlong Deng
In this study, ethylene glycol diglycidyl ether (EGDE) and melamine (ME) were used to prepare a spherical composite material CMC-LTO-EGDE-ME through the strategy of cross-linking reaction of biodegradable sodium carboxymethyl cellulose (CMC) with Li2TiO3 (LTO) to improve the cycle stability of the adsorption-desorption for lithium recovery. In the geothermal water at 333.15°K, the adsorption capacity of the spherical composite adsorbent for lithium-ion is 12.02 mg/g, and the adsorption equilibrium time is 8 h. There is a good selectivity of Li+ (Kd = 3.7 × 103) and high separation factors between Li+ and Na+, K+, Cs+ and Ca2+ (between 39.17 and 181.97). Studies on adsorption kinetics and adsorption isotherm showed that composite material’s adsorption process was obtained from the pseudosecond-order kinetics and the molecular diffusion model. It was found that the composite material has broad applications in lithium recovery from geothermal water.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Batteries-Basel
·
2022
·Vol. 8
·期 8
·78
·
IF 5.938
Dan Shao,Dewei Rao,Aihua Wu,Xiangyi Luo
Large cations such as potassium ion (K+) and sodium ion (Na+) could be introduced into the lithium-ion (Li-ion) battery system during material synthesis or battery assembly. However, the effect of these cations on charge storage or electrochemical performance has not been fully understood. In this study, sodium ion was taken as an example and introduced into the lithium titanium oxide (LTO) anode through the carboxymethyl cellulose (CMC) binder. After the charge/discharge cycles, these ions doped into the LTO lattice and improved both the lithium-ion diffusivity and the electronic conductivity of the anode. The sodium ion’s high concentration (>12.9%), however, resulted in internal doping of Na+into the LTO lattice, which retarded the transfer of lithium ions due to repulsion and physical blocking. The systematic study presented here shows that large cations with an appropriate concentration in the electrode would be beneficial to the electrochemical performance of the Li-ion battery.Keywords:lithium-ion battery;LTO anode;sodium doping;lithium-ion diffusivity
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Xing Li,Jun Xu,Pengxiao Huang,Wei Yang,Zhiqiang Wang,Mingshan Wang,Yun Huang,Ying Zhou,Meizhen Qu,Zuolong Yu,Yuanhua Lin
The in-situ carbon coated LTO composite (LTO/C-PR) is synthesized via a wet chemical method from the phenolic resin coated TiO 2 (TiO 2 /PR) and Li 2 CO 3 . The results indicate that the coated carbon layer pyrolyzing from phenolic resin exhibits higher degree of graphitization than that of pyrolyzing from glucose. The LTO/C-PR composite shows better rate capability and cyclic performance than the LTO/C-G composite using glucose as pyrolytic carbon source. Furthermore, it is found that the higher graphitization of carbon layer can more efficiently suppress the interfacial reactions between the LTO and the electrolyte at the cut-off voltages of 1–3 V. Moreover, the higher graphitization of carbon layer is also favorable to impede the deeper reduction decomposition of the electrolyte below 1.0 V by forming a more successive and thinner SEI film on the LTO electrode. These results indicate that coating the LTO with higher graphitization of carbon layer should be more preferable to solve both the rate capability and the gas generation behavior of the LTO anode material.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Tianyu Zhu,Cuiping Yu,Yucheng Wu,Yan Wang
The capacity of Li4Ti5O12 (LTO) at high rates is limited due to the polarization caused by its modest Li-ion (Li+) diffusion coefficient and low electrical conductivity. Coating with ionic conductors is an available method to ameliorate charge transport. Li1+xAlxTi2–x(PO4)3 ion conductors with thermal, chemical, and electrochemical stabilities have been proven to be modification materials for electrodes. Herein, the Li1.4Al0.4Ti1.6(PO4)3 (LATP) precursor dispersion with optimized preparation is applied to the surface modification of LTO by a dynamic mix-drying method. A proper amount of LATP ultrafine particle coating could develop the ion transport rate in the electrode and restrain side reactions. The 2 wt % LATP–LTO anode exhibits an optimized capacity of 168.2 mA h g–1 at 0.1 A g–1 and retains 96.7% of its capacity after 5000 cycles at 5.0 A g–1, while the P-LTO anode retains 86.3% of the capacity. Improved Li+ transport and interface stability in the electrodes lead to the boosted rate and cycling stability. The LATP-modified LTO composites provide a possibility for the further application of related materials in the energy storage field.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qinghui Wu,Zhezheng Ding,Caijian Wang,Zijie Chen,Kunyan Sui,Yuan Liu,Pengfei Qi
Ion-sieve materials are effective and economical to extract and recovery liquid lithium in practical applications. However, it is greatly limited by its lower actual adsorption capacity than theory value as well as its tardy diffusion rate. Here, a hollow nanofiber Li 4 Ti 5 O 12 with the outer wall of acicular lamellas (LTO-A) were prepared via electrostatic spinning followed by hydrothermal lithiation techniques, showing super-high and ultra-fast extraction of lithium ions. The as-prepared LTO-A displayed abundant ions diffusion channels, polycrystalline property and large surface areas. It exhibits a remarkable adsorption capacity of 60.8 mg·g −1 , approaching to its theoretical adsorption capacity. More surprisingly, the cracks between the massive acicular lamellas facilitate the transport of lithium ions, reaching a rapid equilibrium extraction within 20 min. The LTO-A present high selectivity and stability during cycle experiments. Additionally, the matrix mixed membrane with loaded LTO-A demonstrate high lithium ions conductivity. The structure characterization and DFT calculation showed that abundant ions diffusion channels and the exposed crystal planes of (440), (400) and (111) paly central roles for the outstanding performance of LTO-A. This study provides a promising avenue for the efficient and rapid extraction of lithium from complex aqueous solutions.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Quansheng Li,Xiaofei Sun,Xuesong Mei,Lingzhi Wang,Minxing Yang,Jianlei Cui,Wenjun Wang
The development of energy storage devices with high energy density relies heavily on thick film electrodes, but it is challenging due to the limited ion transport kinetics inherent in thick electrodes. Here, we report on the preparation of a directional vertical array of micro-porous transport networks on LTO electrodes using a femtosecond laser processing strategy, enabling directional ion rapid transport and achieving good electrochemical performance in thick film electrodes. Various three-dimensional (3D) vertically aligned micro-pore networks are innovatively designed, and the structure, kinetics characteristics, and electrochemical performance of the prepared ion transport channels are analyzed and discussed by multiple characterization and testing methods. Furthermore, the rational mechanisms of electrode performance improvement are studied experimentally and simulated from two aspects of structural mechanics and transmission kinetics. The ion diffusion coefficient, rate performance at 60 C, and electrode interface area of the laser-optimized 60-15% micro-porous transport network electrodes increase by 25.2 times, 2.2 times, and 2.15 times, respectively than those of untreated electrodes. Therefore, the preparation of 3D micro-porous transport networks by femtosecond laser on ultra-thick electrodes is a feasible way to develop high-energy batteries. In addition, the unique micro-porous transport network structure can be widely extended to design and explore other high-performance energy materials.
研究领域:
材料科学
·
能源存储技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2017
·
IF 3.833
Lan Zhang,Kaihang Zhang,Zhaohui Shi,Suojiang Zhang
Li4Ti5O12 (LTO) is a promising anode material for electric vehicles (EVs) and electrochemical energy storage applications because of its safety, good rate capability, and long cycle life. At elevated temperature, such as 60 °C, it always shows poor cycle performance because of the instability between the electrode material and electrolyte, which may also lead to a serious gassing issue. In this article, a facile hydrothermal method is adopted to coat the LTO powder with a thin LiF layer, in which the LiF acts as an artificial solid electrolyte interface (SEI) layer to prevent the direct contact of LTO and electrolyte, thus improving the high-temperature cycle performance. Electrochemical tests prove that the LiF coating layer has no influence on the kinetics at ambient temperature and greatly enhances the high-temperature cycle stability, and the LTO@LiF composite material keeps 87% of its initial discharge capacity in 300 1C cycles at 60 °C. Moreover, the LiF coating layer exhibits a special self-driven reforming process during the initial cycles, which makes it uniform and more effective at enhancing the stability between electrode/electrolyte interfaces.
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
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Mengjiao Li,Keqiang Ding,Weijia Li,Ying Bai,Xiaoxuan Liang,Yiqing Chen,Jiawen Bao,Mingxing Wu,Hui Wang
For the first time, it is discovered that copper acetylacetonate (denoted as Cu(acac) 2 ) can be employed as an additive to significantly improve the long-term high rate performance of the commercial lithium titanate (Li 4 Ti 5 O 12 , LTO) through sintering a tablet containing LTO and Cu(acac) 2 . In this work, firstly, a mixture containing LTO and Cu(acac) 2 with a Ti to Cu molar ratio of 5:2 is pressed into a tablet, and then, the resultant tablets are sintered in air at three different temperatures. The specimens sintered at 510°C, 610°C and 710°C are nominated as material a, b and c, respectively. And, LTO and CuO, as revealed by the XRD and XPS tests, are indicated to be the main components of all the sintering products. Above all things, as verified by the results of GCD (galvanostatic charge-discharge) experiments, the battery performances of all the sintering products are much better than that of the pure LTO (material o). In particular, the long-term high rate performances of all resultant materials are significantly superior to that of the commercial LTO, for instance, the discharge capacities tested at 20C after 500 cycles are about 46, 72 and 62 mAh g -1 of material a, b and c, respectively, being about 1.2, 1.9 and 1.6 times that of the commercial LTO (38 mAh g -1 ). The significantly reduced charge transfer resistance (R ct ) as well as the improved reversibility of Li + insertion and extraction process is analyzed to be the principal reasons giving all prepared materials, especially material b, an excellent long-term high rate performance. Preparing a novel lithium ion batteries (LIBs) anode material of CuO-containing LTO and showing a new approach to greatly enhance the long-term high rate performance of LTO are two main dedications of this preliminary work, which is very helpful to the further exploration of LTO.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2020
·
IF 16.28
Dongdong Wang,Hongxia Liu,Zhongqiang Shan,Dawei Xia,Ren Na,Haodong Liu,Baohe Wang,Jianhua Tian
Enhancing the electron/ion transfer ability of Li 4 Ti 5 O 12 materials is very important to achieve advanced high-rate and long-life anode in lithium ion batteries (LIBs). Here, for the first time, we report Li 4 Ti 5 O 12 /nitrogen, sulfur co-doped porous graphene composites (LTO/N, S-PG) via one-step facile calcination and activation process by using LiOH as Li source and activating agent. Mechanisms underlying the beneficial effects of N, S co-doped graphene for LTO anode were substantiated by the Density Functional Theory (DFT) calculations, revealing that co-doped N and S atoms not only significantly facilitate Li + adsorption, but also ameliorate Li + diffusion in graphene. Furthermore, the synergistic effects of nanosized LTO and porous graphene endow the composites with efficient Li + diffusion channels and electron-conductive networks. Therefore, the LTO/N, S-PG can deliver extraordinarily high rate capability ( e.g. 130 mA h g −1 at 80 C and 123 mA h g −1 at 100 C), and excellent cycling stability (83.1% capacity retention after 4000 cycles at 20 C). In addition, their superior electrochemical performance was also demonstrated in the full cells with LiNi 0.5 Mn 1.5 O 4 cathode, which displayed 89.5% capacity retention after 500 cycles at 5 C. These results suggest the great promise of using the LTO/N, S-PG as a novel anode material for high-rate and long-life LIBs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2025
·
IF 2.6
Keqiang Ding,Ying Bai,Xiaoxuan Liang,Yiqing Chen,Jiawen Bao,Qian Zhao,Mingxing Wu,Hui Wang
For the first time, a copper oxide (CuO)-containing lithium titanate (Li 4 Ti 5 O 12 , LTO) is prepared via an air annealing approach in which copper oxalate (CuC 2 O 4 ) and the commercial LTO are employed as the starting materials. As demonstrated by the X-ray diffractometer and X-ray photoelectron spectroscopy characterization results, CuO and LTO are indicated to be the main components of all prepared samples. Above all, all prepared samples, especially sample b, exhibit much better electrochemical performance than the commercial LTO. Particularly, the high-rate performances delivered by all synthesized samples, especially sample b, are significantly superior to that of the commercial LTO. For instance, the discharge capacity of sample b at 40 C after 500 cycles is about 40 mAh g −1 , which is about 14.8 times higher than that of the commercial LTO (2.7 mAh g −1 ). In the full-cell test, the discharge capacity of the cell assembled by sample b and the modified lithium iron phosphate (LiFePO 4 , LFP) at 10 C after 500 cycles (40.3 mAh g −1 ) is significantly larger than that of the full-cell assembled by the commercial LTO and the modified LFP (0.1 mAh g −1 ).
✓ 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）