ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Jianqing Zhou,Qiancheng Zhu,Hao Hu,Wenjuan Chen,Ying Yu
Spinel Li 4 Ti 5 O 12 known as a “zero-strain” anode material for Li-ion battery has attracted much attention because of its superior safety and stability. Herein, we report a novel H 2 O 2 -assisted one-step hydrothermal method to synthesize different ratio Li 4 Ti 5 O 12 /TiO 2 composites with the same amount of raw materials. For the first time, Li 4 Ti 5 O 12 was prepared directly from commercial titania with the presence of H 2 O 2 , and different proportion Li 4 Ti 5 O 12 /TiO 2 composites were fabricated only by adjusting the amount of H 2 O 2 . The reaction mechanism of the novel H 2 O 2 -assisted method was clearly investigated, and H 2 O 2 plays a crucial role in the formation of intermediate Li 1.81 H 0.19 Ti 2 O 5 ·2H 2 O. Further, the electrochemical performance of different ratio Li 4 Ti 5 O 12 /TiO 2 composites have been investigated. This facile method is also applicable for the preparation of Na 2 Ti 6 O 13 /TiO 2 material, and provides us the new way to fabricate composite materials.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
Chemistry-An Asian Journal
·
2016
·Vol. 11
·期 8
·1273-1280
·
IF 4.592
Chenguang Dai,Jing Ye,Shiyong Zhao,Ping He,Haoshen Zhou
Graphical What′s on tap today ? Li 4 Ti 5 O 12 (LTO) and 0.5 Li 2 MnO 3 ⋅0.5 LiNi 0.4 Co 0.2 Mn 0.4 O 2 (NCM) microspheres show a good electrochemical performance and high tap density. The Li 4 Ti 5 O 12 / x Li 2 MnO 3 ⋅(1- x ) LiMO 2 lithium-ion battery system can offer a higher energy density than Li 4 Ti 5 O 12 /LiCoO 2 cells. In this work, we propose an effective way to prepare nanosized Li 4 Ti 5 O 12 (LTO) microspheres and 0.5 Li 2 MnO 3 ⋅0.5 LiNi 0.4 Co 0.2 Mn 0.4 O 2 (NCM) microspheres by similar spray-drying methods. Both obtained materials are accumulated by primary nanoparticles and show a spherical morphology with particle distribution of 10–20 μm. The LTO microspheres deliver a tap density of 1.04 g cm −3 , while the tap density of NCM microspheres is 2.07 g cm −3 , which means an enhanced volumetric energy density. The as-prepared LTO microspheres have a reversible capacity of 170 mA h g −1 at 0.1 C and a capacity retention of 97 % after 250 cycles at 1 C. The NCM microspheres have an initial discharge capacity of 270 mA h g −1 with a corresponding Coulombic efficiency of 88 % at 0.03 C. Both materials show a relatively good rate capability. The Li 4 Ti 5 O 12 /0.5 Li 2 MnO 3 ⋅0.5 LiNi 0.4 Co 0.2 Mn 0.4 O 2 cells deliver a high cathode specific capacity of 273 mA h g −1 and good initial Coulombic efficiency of 88 % at 0.03 C, and can be developed for powering hybrid and plug-in hybrid vehicles.
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 Chemistry A
·
2015
·Vol. 4
·期 6
·2089-2095
·
IF 7.443
Yakun Tang,Lang Liu,Hongyang Zhao,Dianzeng Jia,Wei Liu
Porous CNT@Li4Ti5O12 core–sheath coaxial nanocables were designed using a sol–gel method combined with a following low temperature reflux process and a short post-annealing in the presence of bamboo-like polymer nanotubes acting as a template and a carbon source. As anodes for lithium ion batteries, coaxial nanocables exhibit a high reversible capacity of 322.5 mA h g−1 at 200 mA g−1 after 200 cycles. They also have excellent rate capability and superior long-term cycling stability at high current density, which could attain a high discharge capacity of 198.7 mA h g−1 at 2000 mA g−1 for up to 2000 cycles. Compared with the Li4Ti5O12 nanoparticles, the enhanced electrochemical performance of the CNT@Li4Ti5O12 nanocomposites benefits from the shortened Li+ diffusion distance, large contact surface area, high conductivity, and good structure stability of the coaxial nanocables, which simultaneously solves the major problems on the loss of electrical contact and the aggregation of particles for Li4Ti5O12 anodes. The material with a nanocable structure is a potential candidate for developing advanced electrochemical energy storage systems with high power and long life.
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 POWER SOURCES
·
2018
·
IF 6.945
Chunhai Jiang,Jing Zhao,Huiqing Wu,Zhimin Zou,Renzhong Huang
Hybrid anodes with Li 4 Ti 5 O 12 nanoparticles uniformly embedding in a mesoporous activated carbon matrix are prepared by CO 2 activation of copolymerized resorcinol and hexamethylenetetramine loaded by lithium acetate and tetrabutyl titanate . The Li 4 Ti 5 O 12 /activated-carbon hybrid anodes show increased capacity retention as the activated carbon content in the composite increases, although their overall specific capacity decreases gradually. The hybrid anode with an activated-carbon content of 54 wt% exhibits the highest capacity retention of 67% at 4 A g −1 referencing to that at 0.1 A g −1 . When coupling it with commercial AC cathode, the Li-ion capacitor displays an outstanding high energy density of 38 Wh kg −1 even at a high power density of 7964 W kg −1 . Moreover, an energy density retention of 90.8% after 2000 cycles at 1 A g −1 is preserved, demonstrating its very stable cycle performance. The results reported in this work indicate that the Li 4 Ti 5 O 12 /activated-carbon hybrids prepared by the proposed copolymerization and post-activation process may be very promising anode materials of Li-ion capacitors designed for high power applications.
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 POWER SOURCES
·
2013
·
IF 4.675
Yuan Wang,Haibo Rong,Benzhen Li,Lidan Xing,Xiaoping Li,Weishan Li
Ultrafine Li 4 Ti 5 O 12 /C composite is synthesized by microemulsion with oleic acid as carbon precursor and particle size controller. The as-prepared sample is characterized with X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), thermogravimetry analysis (TGA) and nitrogen absorption–desorption isotherms, and its performance as anode of lithium ion battery is determined with charge–discharge test and electrochemical impedance spectroscopy (EIS). The characterizations show that the as-prepared sample is composed of ultrafine Li 4 Ti 5 O 12 particles with average size of 25 nm, which are uniformly dispersed in carbon matrix with a carbon content as low as 2.69 wt%. Charge–discharge test indicates that the as-prepared sample exhibits excellent rate performance and cycling stability. At 10C, the highest discharge capacity reaches 136.3 mAh g −1 and the capacity retention is 96.4% after 100 cycles. The improved performance of the Li 4 Ti 5 O 12 /C composite is attributed to the ultrafine particle size and the uniform composite of Li 4 Ti 5 O 12 with carbon.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Yubo Xu,Xiaosong Xiong,Jun Peng,Qi Zhou,Wenzhuo Wu,Wanjie Gao,Yi Peng,Tao Wang,Faxing Wang,Yuping Wu
Developing solid-state electrolytes (SSEs) with superior electrochemical performance that are compatible with lithium metal is one of the most promising strategies for solid-state lithium metal batteries (SSLMBs). The widely used polyethylene oxide (PEO)-based solid-state electrolyte is compatible with lithium metal. However, the ionic conductivity of PEO is unsatisfactory, and the poor mechanical performance is not ideal in suppressing lithium dendrites. The bare ether oxygen also causes decomposition under high voltage. Many filler strategies to address these issues have been studied, but the mixed ionic/electronic conductors (MIECs) with electrochemical activity have rarely been investigated due to their fatal electronic conductivity and redox behavior. Herein, a composite solid electrolyte incorporating Li4Ti5O12 (LTO), which is used as an electrochemically active anode for lithium-ion batteries, into PEO was studied and optimized for the electrochemical stable window (ESW), ionic conductivity, interface dynamics and lithium deposition. It is noteworthy that PEO with 60 wt% LTO shows faster ionic transport with a wider ESW. The lithiophilic layer on the surface induces a dendrite-free anode with lower lithium nucleation energy and interface impedance, realizing a much longer stable cycling of Li/Li symmetric cells. The Li/LiFePO4 button cells present a specific discharge capacity of 154.1 mA h g−1 at 0.5C with the retention of 79.1% after 600 cycles. The Li/LiMn0.6Fe0.4PO4 button and pouch cells also show superior electrochemical behavior. This work confirms the multiple improvements of LTO filler in composite solid electrolytes (CSEs) and demonstrates the potential application value of LTO, providing a novel direction for selecting fillers for CSEs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wenjun Zhu,Yuanyu Wang,Yongzhi Yu,Yuehui Hu,Yichuan Chen
In this paper, core-shell structured α-Fe 2 O 3 @Li 4 Ti 5 O 12 composite has been reported based on the design of structure and heterogeneous composite. Compared with pure α-Fe 2 O 3 and α-Fe 2 O 3 @TiO 2 composite, the core-shell structured α-Fe 2 O 3 @Li 4 Ti 5 O 12 composite can deliver a favorable reversible capacity of 898 mAh g −1 at 0.2 A g −1 (642 mAh g −1 at 2 A g −1 ) after 200 cycles and the reversible capacity still maintain 482 mAh g −1 at 3.2 A g −1 . The improved electrochemical property of the composite is attributed to its heterogeneous composite and unique structural advantages: high specific capacity and outstanding rate capability can be guaranteed by the synergistic effect between the inner core of α-Fe 2 O 3 and outer shell of spinel Li 4 Ti 5 O 12 , the large volume variation of α-Fe 2 O 3 can be effectively relieved by spinel Li 4 Ti 5 O 12 with unexceptionable structure stability, and the extra lithium ions storage as well as enhanced kinetics can be contributed by abundant grain boundaries and heterogeneous phase interfaces .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 91
·74774-74782
·
IF 3.84
Wenjun Zhu,Hui Yang,Wenkui Zhang,Hui Huang,Xinyong Tao,Yang Xia,Yongping Gan,Xingzhong Guo
A Li4Ti5O12/TiO2/carbon (Li4Ti5O12/TiO2/C) nanocrystalline composite has been successfully synthesized by a facile sol–gel method and subsequent calcination treatment. Moreover, pure Li4Ti5O12, Li4Ti5O12/C and Li4Ti5O12/TiO2 composites have also been synthesized for comparison. All the samples present a nanocrystalline structure with a uniform size distribution, and abundant phase interfaces can be detected for the Li4Ti5O12/TiO2 and Li4Ti5O12/TiO2/C composites. Electrochemical measurements demonstrate that the resultant Li4Ti5O12/TiO2/C composite exhibits a superior rate capability and cycle stability in comparison with pure Li4Ti5O12, Li4Ti5O12/C and Li4Ti5O12/TiO2 composites, which can be attributed to a high grain boundary density, abundant phase interfaces and in situ formed carbon, for storing extra lithium ions, enhancing rapid lithium insertion/extraction kinetics and improving the electron transport rate.
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
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Dongdong Wang,Zhongqiang Shan,Xiaoyan Liu,Ren Na,Juan Wang,Huitian Liu,Jianhua Tian
The Li 4 Ti 5 O 12 /activated graphene nanoplatelets (Li 4 Ti 5 O 12 /a-GNPs) composites are prepared via a low-cost, green, one-pot hydrothermal process by using LiOH both as lithium source and activating agent for the first time. The LiOH solution concentration and hydrothermal time are optimized to obtain the pure Li 4 Ti 5 O 12 /a-GNPs. The synergistic effects of the nanosized Li 4 Ti 5 O 12 and the three-dimensional porous a-GNPs endow the composites with convenient lithium ion diffusion channels and efficiently conductive structures for electron and ion transport. As anticipated, the Li 4 Ti 5 O 12 /a-GNPs deliver an outstanding rate capability of 125 and 113 mA h g −1 at 80 and 100 C, respectively, and an excellent cycling stability with 90.21% capacity retention after 2000 cycles at 10 C. These results are much better than those of the Li 4 Ti 5 O 12 /GNPs and pure Li 4 Ti 5 O 12 , demonstrating Li 4 Ti 5 O 12 /a-GNPs are promising anode materials for lithium-ion batteries of high current density applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 24
·245404
·
IF 3.953
Suyang Lu,Yunfan Shang,Wei Zheng,Yushuo Huang,Rui Wang,Wenwen Zeng,Haoran Zhan,Ye Yang,Jun Mei
With the increasing applications of Lithium-ion batteries in heavy equipment and engineering machinery, the requirements of rate capability are continuously growing. The high-rate performance of Li4Ti5O12 (LTO) needs to be further improved. In this paper, we synthesized LTO microsphere-TiO2(B) nanosheets (LTO-TOB) composite by using a solvothermal method and subsequent calcination. LTO-TOB composite combines the merits of TiO2(B) and LTO, resulting in excellent high-rate capability (144.8, 139.3 and 124.4 mAh g−1 at 20 C, 30 C and 50 C) and superior cycling stability (98.9% capability retention after 500 cycles at 5 C). Its excellent electrochemical properties root in the large surface area, high grain-boundary density and pseudocapacitive effect of LTO-TOB. This work reveals that LTO-TOB composite can be a potential anode for high power and energy density lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2019
·Vol. 12
·期 19
·4412-4420
·
IF 7.804
Da Li,Wei Zhao,Lei Cao,Yiying Gao,Yahui Liu,Weijing Wang,Tao Qi
Graphical In the mix : A mixed-surfactant-assisted synthesis of dual-phase Li 4 Ti 5 O 12 -TiO 2 hierarchical microspheres is proposed. The ratio of anionic/cationic surfactant regulates the dual-phase ratio and primary structure morphology of the final product. The optimal sample obtained has a better electrochemical performance than similar state-of-the-art materials. A mixed-surfactant-assisted method was developed to synthesize dual-phase Li 4 Ti 5 O 12 -TiO 2 hierarchical microspheres. The ratio of anionic/cationic surfactant could regulate the primary structure morphology and the dual-phase ratio of the final product, in which the primary structure morphology could be stacked nanosheets, small nanoparticles, or large nanoparticles. The sample with a primary structure morphology of small nanoparticles had the highest specific surface area of 79.38 m 2 g −1 and the best electrochemical performance because of its high Li + migration rate, low polarization, and appropriate TiO 2 content. Its capacity reached 153.5 mA h g −1 at a current rate of 40 C, and it retained nearly 100 % of its capacity after 100 cycles. A self-assembly mechanism of the mixed surfactant was highlighted to explain the formation of hierarchical microspheres. The physical and electrochemical properties of obtained material were correlated effectively.
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 NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 12
·8232-8239
·
IF 1.354
Fang Zhao,Peng Jiaxin,Ma Nani,Liang Lisi,Gao Hongquan,Zhou Haitao,Jin Xinkai,Yang Jianhong,Liu Manbo,Du Jinjing,Li Qian,Li Xiaoming,Li Linbo
Lithium ion batteries with graphite negative electrodes have been developed to date due to their low power density, which limits their application in many cases, however. Nanoscale Li4Ti5O12 has higher power density than conventional graphite anode materials. In order to ensure that
the full-cell system has high power and high energy, cathode materials are very important. In this paper, three different cathode materials, LiNi0.8Co0.15Al0.05O2 (NCA), LiNi0.6Co0.2Mn0.2O2 (NCM622),
and LiCoO2 (LCO), were used to conduct a comprehensive study, and optimal NCA-Li4Ti5O12(LTO) full battery system was selected under high power conditions. On the basis, in order to further increase battery power density, and in combination with the
mechanism of the supercapacitor non-Faradic energy storage, polyaniline activated carbon material (PANI-AC) with excellent capacitance characteristics was prepared. In the end, we proposed a new type of hybrid battery capacitor system with high power and high energy.
研究领域:
电化学
·
能源材料
·
纳米科技
·
电源技术
·
储能系统
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）