LANGMUIR
·
2020
·
IF 3.557
Yefeng Feng,Kaidan Wu,Xiaoqian Deng,Jin Ke,BingWen Yang,Huafeng Dong,Deping Xiong,Miao He
The SnO2/Li4Ti5O12/C compound was gained via hydrothermal, sintering, and ball milling methods. Nano-grained SnO2/Li4Ti5O12 are homogeneously wrapped in a sheet-like graphite. Li4Ti5O12 possesses cyclic stability and superior rate capacity. Meanwhile, the SnO2/Li4Ti5O12 hybrid can supply abundant active sites for absorption of Li+, mitigate chemical stress in cycling, and prevent the ultrathin graphite nanosheets from stacking. Besides, the sheet-like graphite could reduce volume variation in cycling and reduce transmission distance for the electron or Li+. Therefore, an outstanding electrochemical property of the SnO2/Li4Ti5O12/C composite can be obtained.
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 Chemistry A
·
2018
·Vol. 6
·期 29
·14339-14351
·
IF 9.931
Chao Huang,Shi-Xi Zhao,Hang Peng,Yuan-Hua Lin,Ce-Wen Nan,Guo-Zhong Cao
Dual-phase hierarchical porous Li4Ti5O12–TiO2 (HP LTO–TO) microspheres were synthesized using a topochemical conversion method and used as an anode material in high power lithium ion batteries, particularly for use in low temperature applications. The HP LTO–TO microspheres are composed of ultra-thin nanosheets with a large specific surface area for interface intercalation reactions and also to provide a much reduced diffusion path for both electrons and lithium ions. The HP LTO–TO electrode was found to exhibit excellent low-temperature cycling capability and rate performance. The discharge capacities of HP LTO–TO under a current rate of 0.2C reached 167 mA h g−1 at 25 °C, 143 mA h g−1 at 0 °C, 130 mA h g−1 at −10 °C, and 94 mA h g−1 at −40 °C. A discharge capacity of 77 mA h g−1 is readily attainable at −20 °C at a high current rate of 5C. The aforementioned high capacity and rate performance at low temperature can be partially attributed to the novel hierarchical porous dual phase microsphere structure made up of thin nanosheets. It is also hypothesized that the co-existence of dual LTO and TO phases may create cation vacancies and/or result in a favorable interface between LTO and TO that permit fast charge and ion transport, even at very low temperatures. This can be attributed to the fact that HP LTO–TO has a relatively low activation energy for Li+ diffusion and a fast surface faradaic reaction, which benefits from the abundant dual-phase interfaces and grain boundaries, as well as the large specific surface area.
研究领域:
材料科学
·
电化学
·
能量存储
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Chuan-Wei Wang,Yao Zhou,Jin-Hai You,Jian-De Chen,Zheng Zhang,Shao-Jian Zhang,Chen-Guang Shi,Wei-Dong Zhang,Ming-Hua Zou,Yang Yu,Jun-Tao Li,Lei-Ying Zeng,Ling Huang,Shi-Gang Sun
The LiCoO2 (LCO) cathode has been widely used in material markets, especially in conventional lithium ion batteries, due to its stable electrochemical performance. Increasing the working cutoff potential represents an efficient pathway to boost the capacity of LCO batteries; however, high working potentials usually induce severe Co3+ dissolution and extensive growth of solid electrolyte interphase (SEI) layer, leading to rapid degradation of the electrochemical performance. In this work, a high voltage cathode is prepared by the encapsulation of aluminum (Al)-doped LiCoO2 in a continuous Li4Ti5O12 (LTO) layer using a high-speed solid-phase coating method. The chemical composition evolution of the coating layer during the cycling process was characterized and evaluated through in situ XRD, XPS, and XAS analyses. The precipitation of aluminum fluoride (AlF3) at the defective sites of the LTO coating layer in the initial charge–discharge cycles effectively was found to fortify the structural integrity of the coating layer and prevent the etching of the LCO from undesirable side reactions with the liquid electrolyte. The modified LCO demonstrated an excellent capacity retention of 89.9% after 100 cycles at 0.2 C. The high-speed solid-phase coating method established in this study could be scaled up straightforwardly, providing a highly commercializable approach for large-scale production of stable high-voltage LCO cathode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yuanyuan Ren,Limin Liu,Zhen Wang,De Li,Yong Chen
Compared with traditional centimeter-level electrodes, microelectrodes exhibit a small reaction area, high sensitivity, fast mass transfer rate, and low polarization current. However, current microelectrode preparation processes are very complicated and costly. Herein, we proposed a facile and universal method for fabricating single-particle microelectrodes. In the precursor solution, polyvinyl alcohol and ammonia were introduced as the polymeric binder and pore-forming agent, respectively. Through spaying-drying-sintering processes, the single-particle microelectrodes were successfully prepared for Li4Ti5O12 (LTO), LiCrTiO4 (LCTO), and LiFePO4/C (LFP/C), which showed excellent electrochemical properties. Furthermore, the single-particle microelectrode can be adopted to study the electrochemical oscillations of Li-ion batteries and assemble a full-cell microbattery as a potential next-generation microscale power source.
研究领域:
电化学
·
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Results in Physics
·
2019
·
IF 3.042
Jian Wang,Yongjie Li,Xiaojun Zhang,Heming Deng,Yuzhen Zhao,Qi Cheng,Xu Gao,Shun Tang,Yuan-Cheng Cao
Lithium-ion batteries (LIBs) technology have been widely utilized as these batteries show great promise as power sources in our life. However, the commercial anode is mainly carbon materials which facing safety issues owing to a low Li-intercalation potential. The spinel Li 4 Ti 5 O 12 (LTO) has attracted special attention for its structural changes lightly, better safety performance and stable cycle reversibility. Herein, we increased the electronic conductivity of LTO via improving the transport properties of the material with sucrose as carbon sources. The modified LTO with sucrose were successfully fabricated and found to exhibit better electronic conductivity. XRD results showed that all the major diffractions from the spinel structure of LTO can be found in the modified LTO such as (1 1 1), (3 1 1), (4 0 0) but there are no observations of the carbon diffraction peaks. Electrochemical impedance spectroscopy (EIS) data shows modified LTO resistance was nearly one third of the standard LTO value, which indicates modifying LTO with sucrose is a promising approach to prepare the high performance LTO anode.
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Wen Li,Aijia Wei,Lihui Zhang,Xiaohui Li,Xue Bai,Zhenfa Liu
The surface of pure Li 4 Ti 5 O 12 was modified with CaF 2 via a chemical co-precipitation method followed by calcination at 400 °C for 5 h in order to study the reaction mechanism of the fluoride modification process. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were used to confirm the structure and morphology of the material. After the modification, the structure of Li 4 Ti 5 O 12 was unchanged, as F − ions reacted with Ca 2 + ions to form CaF 2 instead of reacting with Li 4 Ti 5 O 12 . A consecutive CaF 2 coating layer was not formed on the surface of Li 4 Ti 5 O 12 ; instead, many microscale CaF 2 crystals stacked on the Li 4 Ti 5 O 12 particles. The stacked CaF 2 crystals could not only reduce electrode polarization, but also partially suppress reductive decomposition, resulting in the formation of a thinner SEI film, thereby reducing resistance of the SEI film ( R sei ) and the charge-transfer resistance ( R ct ), both of which were beneficial to the electrochemical performance of Li 4 Ti 5 O 12 . The 2 wt% CaF 2 -modified Li 4 Ti 5 O 12 exhibited a superior rate capacity, with discharge capacities between 0 and 3 V of 227.8, 215.8, 207.6, 190.6, 180.2, and 157.6 mAh g − 1 at rates of 0.2, 0.5, 1, 3, 5, and 10 C (1 C = 250 mAh g − 1 ), respectively. Moreover, the 2 wt% CaF 2 -modified Li 4 Ti 5 O 12 showed a discharge capacity retention of 96.7% after 125 cycles at a rate of 3 C, higher than that of pure Li 4 Ti 5 O 12 (94.4%), which was due to the fact that CaF 2 modification enhanced the capability of the material to resist HF attack during the discharge/charge processes.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Zhen Zhao,Yunlong Xu,Mandi Ji,Huang Zhang
F-doped Li 4 Ti 5 O 12 anode materials in the form of Li 4 Ti 5 O 12− x F x (0 ≤ x ≤ 0.5) are synthesized successfully via a solid-state reaction. The structure and electrochemical properties of the as-prepared powders are investigated. The Li 4 Ti 5 O 12− x F x ( x = 0.3) sample exhibits an outstanding electrochemical performance among all the samples in a potential range from 0.01 to 2.5 V, and delivers higher discharge capacity and better long-term cycling stability compared with the pristine Li 4 Ti 5 O 12 . The initial specific discharge capacity is 234.5 mAh g −1 at a density of 85 mA g −1 , and remains about 138 mAh g −1 over 500 cycles when the current density increases to 340 mA g −1 . The excellent electrochemical performance could be attributed to the substitution of F − into O 2− site, which can increase the amount of Ti 3+ /Ti 4+ mixing as charge compensation, leading to the decrease of the charge transfer resistance and improvement of the lithium ion diffusion in Li 4 Ti 5 O 12− x F x .
研究领域:
材料科学
·
电化学
·
储能
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 8
·e202102475
·
IF 9.14
Zhenjie Cheng,Chenggang Wang,Yansong Zhu,Cheng Wang,Xiaolei Jiang,Zhao Qian,Bo Chen,Jian Yang
Li-ion batteries with LiFePO 4 cathode and Li 4 Ti 5 O 12 anode show promise for storing renewable energy. However, their low output voltage results in a low energy density. In contrast, dual-ion batteries with graphite cathode and Li 4 Ti 5 O 12 anode can achieve a high output voltage of >3.0 V. In this study, mesocarbon microbeads (MCMB)@LiFePO 4 ||Li 4 Ti 5 O 12 dual-ion batteries are developed to address these issues. In the cathode, MCMB improves the conductivity of LiFePO 4 and increases the output voltage by the intercalation of anions in the cell voltage range of 2.1–3.5 V. Moreover, the LiFePO 4 shell sustains the structural integrity of MCMB and generates in situ a cathode-electrolyte interphase (CEI) with rich LiF. Owing to these unique compositional and structural features, MCMB@LiFePO 4 ||Li 4 Ti 5 O 12 manifests much better electrochemical performance than LiFePO 4 ||Li 4 Ti 5 O 12 and MCMB||Li 4 Ti 5 O 12 . It sustains 89.6 % of the initial capacity after 1200 cycles at 0.2 A g −1 and achieves a specific energy up to 128 Wh kg −1 at 179 W kg −1 . Graphical Block rockin’ beads : The low output voltage of LiFePo 4 ||Li 4 Ti 5 o 12 batteries results in a small energy density. In this study, mesocarbon microbeads (MCMB)@LiFePo 4 ||Li 4 Ti 5 o 12 dual-ion batteries are developed to address this issue. MCMB increases the output voltage by the anion intercalation and the LiFePo 4 shell sustains the structural integrity of MCMB and generates a LiF-rich cathode-electrolyte interphase.
研究领域:
电化学
·
储能
·
材料科学
·
锂离子电池
·
电池技术
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Weikang Mei,Guobao Xu,Hongyu Wang
Li4Ti5O12 (LTO)/LiNi0.5Mn1.5O4 (LNMO) batteries have appealing features, such as suitable energy density and high safety. A proper binder of the LNMO cathode and electrolyte can improve the performance of batteries. Herein, we first combined the polyacrylic acid (PAA) binder with an ester-based electrolyte due to their homologous structure. This system has better performance than other binders of LNMO cathode, like poly(vinylidene fluoride) (PVDF), styrene–butadiene rubber (SBR), and polytetrafluoroethylene (PTFE). In the methyl acetate (MA) electrolyte, the LTO/LNMO battery with the PAA binder exhibited the highest discharge capacity (137 mAh g–1 at 0.5 C) and the best rate performance (112 mAh g–1 at 5 C). In addition, MA boosted the low-temperature performance of this battery, which can work at −40 °C with a remarkable reversible capacity of 90 mAh g–1 and a discharge capacity of 140 mAh g–1.
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 Nano
·
2022
·
IF 18.027
Zhisheng Wu,Zhendong Lian,Shanshan Yan,Jielei Li,Jincheng Xu,Shi Chen,Zikang Tang,Shuang-Peng Wang,Kar Wei Ng
Aqueous electrochromic battery (ECB) is a multifunctional technology that shows great potential in various applications including energy-saving buildings and wearable batteries with visible energy levels. However, owing to the mismatch between traditional electrochromic materials and the electrolyte, aqueous ECBs generally exhibit poor cycling stability which bottlenecks their practical commercialization. Herein, we present an ultrastable electrochromic system composed of lithium titanate (Li4Ti5O12, LTO) electrode and Al3+/Zn2+ hybrid electrolyte. The fully compatible system exhibits excellent redox reaction reversibility, thus leading to extremely high cycling stabilities in optical contrast (12 500 cycles with unnoticeable degradation) and energy storage (4000 cycles with 82.6% retention of capacity), superior electrochromic performances including high optical contrast (∼74.73%) and fast responses (4.35 s/7.65 s for bleaching/coloring), as well as excellent discharge areal capacity of 151.94 mAh m–2. The extraordinary cycling stability can be attributed to the robust [TiO6] octahedral frameworks which remain chemically active even upon the gradual substitution of Li+ with Al3+ in LTO over multiple operation cycles. The high-performance electrochromic system demonstrated here not only makes the commercialization of low-cost, high-safety aqueous-based electrochromic devices possible but also provides potential design guidance for LTO-related materials used in aqueous-based energy storage devices.
研究领域:
材料科学
·
能源技术
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Chengxing Lu,Xin Wang,Xin Zhang,Huifen Peng,Yongguang Zhang,Gongkai Wang,Zhenkun Wang,Guanlong Cao,Nurzhan Umirov,Zhumabay Bakenov
In order to improve the electrochemical performance of lithium titanium oxide, Li 4 Ti 5 O 12 (LTO), for the use in the lithium-ion capacitors (LICs) application, LTO/graphene composites were synthesized through a solid state reaction. The composite exhibited an interwoven structure with LTO particles dispersed into graphene nanosheets network rather than an agglomerated state pristine LTO particles. It was found that there is an optimum percentage of graphene additives for the formation of pure LTO phase during the solid state synthesis of LTO/graphene composite. The effect of graphene nanosheets addition on electrochemical performance of LTO was investigated by a systemic characterization of galvanostatic cycling in lithium and lithium-ion cell configuration. The optimized composite exhibited a decreased polarization upon cycling and delivered a specific capacity of 173 mA h g −1 at 0.1 C and a well maintained capacity of 65 mA h g −1 even at 20 C. The energy density of 14 Wh kg −1 at a power density of 2700 W kg −1 was exhibited by a LIC full cell with a balanced mass ratio of anode to cathode along with a superior capacitance retention of 97% after 3000 cycles at a current density of 0.4 A g −1 . This boost in reversible capacity, rate capability and cycling performance was attributed to a synergistic effect of graphene nanosheets, which provided a short lithium ion diffusion path as well as facile electron conduction channels.
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
RSC Advances
·
2014
·Vol. 4
·期 79
·41968-41975
·
IF 3.708
Xiaona Han,Zhen Zhao,Yunlong Xu,Dong Liu,Huang Zhang,Chongjun Zhao
The F-doped and carbon coated Li4Ti5O12−xFx/C (LTOF/C) composite anode materials are synthesized via a conventional solid-state reaction with lithium citric acid as the conductive carbon source, and LiF as the fluorine source. The structure and electrochemical properties of the LTOF/C materials are investigated and the effects of carbon coating and F ion doping on the performance of as-prepared materials are discussed. Under a potential range from 0.01 to 2.5 V, LTOF/C exhibits better reversibility and higher cyclic stability compared with LTO and LTO/C, especially at high current rates. The initial specific discharge capacity is 325.6 mA h g−1 at a current density of 170 mA g−1, and remains about 165 mA h g−1 over 1000 cycles when the current density increases to 850 mA g−1. The main factors influencing the excellent performances should be attributed to the cooperation of the F-doping and carbon-coating, which can increase the amount of mixed Ti3+/Ti4+, leading to improved ionic conductivity and electron conductivity in LTO at the same time.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米材料
·
锂离子电池
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）