Materials Research Express
·
2016
·Vol. 3
·期 4
·045010
·
IF 0.968
Ting Fan,Jiantao Lü,Futian Lin,Zifan Zhou
Improved red emission in polyvinylpyrrolidone (PVP)-coated hollow LaF3:Eu3+ nanoparticles by introducing Li+ ions was found for the first time via a one-step template-free hydrothermal method. The hollow formation can be attributed to self-recrystallization and a local Ostwald ripening thermodynamic process. Pores were clearly seen and widely distributed in all LaF3 nanoparticles. The introduction of Li+ ions did not introduce new crystalline phases and resulted in little change in size and morphology of the LaF3 nanoparticles. The main diffraction peaks were found to shift slightly with the Li+ doping concentrations, which indicates that Li+ changes the crystal field environment of Eu3+. The excitation and red emission intensity both doubled when codoped with 7 mol% Li+ ions. The widely distributed pores and improved luminescence properties of our nanoparticles facilitated the construction of new nanocomposites for novel biological applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Qian Wu,Yun Yang,Zheng Chen,Qinting Su,Songde Huang,Dakun Song,Caizhen Zhu,Rui Ma,Cuihua Li
Gel electrolytes have attracted great attention due to the high ionic conductivity and superior mechanical strength. However, poor interfacial stability between Li metal and gel electrolytes hinders their practical application. Here, a double polymer network gel electrolyte (DPNGE) is prepared via photopolymerizing branched acrylate on the poly(vinylidene fluoride-co-hexafluoropropylene) matrix to solve this issue. This DPNGE possesses an enhanced ionic conductivity of 9.5 × 10–4 S cm–1 at room temperature and a wide electrochemical stability window up to 5.0 V. The assembled Li/DPNGE/LiFePO4 batteries demonstrated a 153.7 mA h g–1 initial discharge capacity at 0.5 C and keep 92.7% capacity retention after more than 500 cycles. Moreover, a systematic analysis confirms that we construct a stable solid electrolyte interphase layer for homogeneous deposition and a stable cycle. These advantages enable the prepared DPNGE to show great application potential in high-performance lithium metal batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yuepeng Pang,Jing Wang,Zhiguo Zhou,Tao Yuan,Junhe Yang,Dalin Sun,Shiyou Zheng
Core-shell Fe 3 O 4 @Fe ultrafine nanoparticles (nano-Fe 3 O 4 @Fe, Fe 3 O 4 content 84 wt%) with a core (Fe) diameter of 5.1 ± 1.4 nm and a shell (Fe 3 O 4 ) diameter of 10.9 ± 1.6 nm is prepared by a liquid-phase pyrolysis and partial oxidation method. It is found that the core-shell Fe 3 O 4 @Fe ultrafine nanostructure can efficiently improve the electrochemical performance of Fe 3 O 4 as anode material for Li-ion batteries in terms of rate capability and cycle life. For instance, specific capacities of 884 and 705 mAh/g can be obtained for the nano-Fe 3 O 4 @Fe electrode after 100 cycles at 200 mA/g and 500 cycles at 1000 mA/g, respectively. It is believed that these improvements can be attributed to the significant shortened transfer distance of electrons and Li-ions with relatively low specific surface area, ultrahigh electronic conductivity inside the nanoparticles and good ductility to accommodate the asymmetric volume change.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2013
·
IF 3.473
Guiru Zhu,Pan Wang,Pengfei Qi,Congjie Gao
A series of PVC-Li 1.6 Mn 1.6 O 4 precursor membranes were prepared by the solvent exchange method using spinel-type lithium manganese oxide powder (Li 1.6 Mn 1.6 O 4 ) as the precursor, poly(vinyl chloride) (PVC) as the binder, and N,N-dimethyl acetamide (DMAc) as solvent. The Li + of the precursor membrane was extracted by treated with HCl solution to obtain PVC-H 1.6 Mn 1.6 O 4 lithium ion-sieve membrane adsorbent. The preparation conditions were investigated by changing the concentration of PVC and Li 1.6 Mn 1.6 O 4 , and the thickness of liquid film . The structure, morphology and adsorption properties of PVC-H 1.6 Mn 1.6 O 4 lithium ion-sieve membrane were carried out by scanning electron microscope and atomic absorption spectrophotometer. The adsorption capacity depended on the preparation conditions. The membrane prepared with concentration of 10 wt% PVC and 15 wt% Li 1.6 Mn 1.6 O 4 in DMAc and liquid film thickness of 0.30 mm is optimum for the adsorption of Li + from aqueous solution. The thickness of membrane prepared under above conditions is about 0.1 mm. Repeated adsorption–desorption test indicates that the PVC-H 1.6 Mn 1.6 O 4 lithium ion-sieve membrane can be effectively regenerated with HCl solution and reused for Li + adsorption without significant loss in the adsorption capacity. Li + adsorption experiments confirm that the PVC-H 1.6 Mn 1.6 O 4 lithium ion-sieve membrane possesses high selectivity for Li + in the presence of Na + , K + , Ca 2+ and Mg 2+ . According to the coefficients, the isothermal data correlated with the Langmuir model better than the Freundlich model, and the adsorption process follows a pseudo-second-order kinetic model .
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Jingang Yang,Junke Hou,Yubin Niu,Wenjun Li,Fenglian Yi,Sangui Liu,Guannan Li,Maowen Xu
Ti 0.9 Fe 1.1 O 3 with a solid solution structure has been synthesized and investigated as an anode material for rechargeable Li-ion batteries. Ti 0.9 Fe 1.1 O 3 was prepared by a solid-state reaction of Fe, Fe 2 O 3 and TiO 2 . Without other modification, the obtained Ti 0.9 Fe 1.1 O 3 exhibited high discharge capacity and remarkable cycle capability compared with the commercial Fe 2 O 3 sample. A reversible capacity of 454.9 mA h g −1 and coulombic efficiency of 100% at 100 mA g −1 could be achieved and kept even after 500 cycles. The prominent electrode performance could be attributed to the stable solid solution structure, in which Titanium is inactive and only support the unstable structure during reversible electrochemical processes .
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Yueqing Li,Zichen Wang,Wentao Lin,Bixia Wei,Dengjie Chen
Realizing the high energy density of lithium batteries depends significantly on creating an electrolyte suited for high-voltage operation and compatible with lithium metal. Generally, a high concentration of solvents within diluted electrolytes may readily form thick and susceptible solid electrolyte interphases, especially when encountering high-voltage operation and a lithium-metal anode. Herein, we present an electrolyte design by significantly increasing the LiTFSI salt concentration within the dimethyl carbonate (DMC) solvent to solve the interfacial incompatibility. The increased salt concentration not only leads to the ion association mode’s gradual evolution from a solvent-separated ion pair into a contact ion pair (CIP) but also enhances the oxidation stability. Although a CIP structure generally results in a relatively low ionic conductivity, the lack of free solvent molecules can enhance the compatibility between the designed electrolyte and electrodes. Furthermore, the concentrated 3.5 M LiTFSI electrolyte with DMC as the solvent still maintains a relatively low viscosity, e.g., ∼4.8 mPa s at 30 °C. As a result, LiFePO4 (LFP)//Li and LiNi0.5Co0.2Mn0.3O2 (NCM)//Li cells with the 3.5 M LiTFSI electrolyte exhibit exceptional electrochemical performance. A constructed LFP//Li battery operates stably at 2.0 C for 200 cycles, with a retained discharge capacity of 115.4 mAh g–1, and a NCM//Li cell cycles stably from 2.0 to 4.2 V for 100 cycles. Even after raising the top cutoff voltage to 4.4 V vs Li/Li+, a NCM//Li cell still exhibits a discharge capacity of 89.3 mAh g–1 after 50 cycles at 1.0 C. Therefore, this LiTFSI/DMC-based concentrated electrolyte is promising for high-energy-density lithium-metal batteries.
研究领域:
电化学
·
能源材料
·
锂离子电池
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Chuan-tao Song,Bo-wen Huang,Xiao-zhen Liao,Xiao-min Liu,Hui Yang,Zi-feng Ma
Li–O 2 cell is considered as an ideal choice for the electric vehicles due to its high energy density , but is now suffering from the large charge polarization and low practical capacity. In this context, three-dimensional network macro-porous CoO synthesized via a sol–gel method is applied as an efficient catalyst in Li–O 2 cells to alleviate this situation. Compared to KB (Ketjen black EC600JD) based cells, the CoO/KB based cell exhibits much improved electrochemical performance at various current densities, including flatter discharge/charge plateau, lower polarization and higher specific capacity. In addition, the CoO/KB based cell maintains the discharge capacity up to 4500 mAh g −1 CoO/KB after being cycled at 0.1 mA cm −2 for 16 days under O 2 atmosphere. This excellent electrochemical performance is attributed to the high catalytic activity and abundant macro-pores of our home-made CoO. This strategy of designing CoO might be a feasible way to obtain the Li–O 2 cell with low polarization and high capacity.
研究领域:
能源材料
·
电化学
·
催化
·
电池技术
✓ 已验证
DOI
高影响因子
Journal of the American Chemical Society
·
2021
·
IF 15.419
Yingli Wang,Fangming Liu,Guilan Fan,Xiaoguang Qiu,Jiuding Liu,Zhenhua Yan,Kai Zhang,Fangyi Cheng,Jun Chen
Engineering a stable solid electrolyte interphase (SEI) is one of the critical maneuvers in improving the performance of a lithium anode for high-energy-density rechargeable lithium batteries. Herein, we build a fluorinated lithium/sodium hybrid interphase via a facile electroless electrolyte-soaking approach to stabilize the repeated plating/stripping of lithium metal. Jointed experimental and computational characterizations reveal that the fluorinated hybrid SEI mainly consisting of NaF, LiF, LixPOyFz, and organic components features a mosaic polycrystalline structure with enriched grain boundaries and superior interfacial properties toward Li. This LiF/NaF hybrid SEI exhibits improved ionic conductivity and mechanical strength in comparison to the SEI without NaF. Remarkably, the fluorinated hybrid SEI enables an extended dendrite-free cycling of metallic Li over 1300 h at a high areal capacity of 10 mAh cm–2 in symmetrical cells. Furthermore, full cells based on the LiFePO4 cathode and hybrid SEI-protected Li anode sustain long-term stability and good capacity retention (96.70% after 200 cycles) at 0.5 C. This work could provide a new avenue for designing robust multifunctional SEI to upgrade the metallic lithium anode.
研究领域:
材料科学
·
电化学
·
储能
·
电池技术
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Zhanwei Xu,Hang Niu,Ying Zhang,Siyu Chen,Wenyang Li,Jiayin Li,Liang Li,Xuetao Shen
The shuttle behavior and sluggish conversion kinetics of polysulfides (LiPSs) significantly hinder sulfur utilization and cycle stability of lithium–sulfur (Li–S) batteries. Herein, iron hexadecafluorophthalocyanine (FePcF16) nanoparticles were in situ tailored on oxidized apple pomace carbon (OAPC) with a 3D porous structure to construct a high-performance FePcF16/OAPC sulfur host for advanced Li–S batteries. The designed FePcF16 nanoparticles have strong adsorption and catalytic conversion capabilities, which can reduce the redox reaction energy barrier, accelerate the conversion rate, and inhibit the LiPS shuttle. Meanwhile, the unique porous structure of OAPC effectively realizes the sulfur accommodation and rapid transport of substances. The average capacities of batteries with FePcF16/OAPC were 926.83, 847.11, and 782.63 mA h/g after 500 cycles at 1, 2, and 3C current densities, with capacity decay rates of only 0.020%, 0.031%, and 0.043% per cycle, respectively. Furthermore, it delivers favorable cycling stability at a sulfur load of 4.32 mg/cm2.
研究领域:
储能
·
材料科学
·
电化学
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shuxin Zhang,Wen Ren,Yanna NuLi,Baofeng Wang,Jun Yang,Jiulin Wang
Magnesium-sulfur (Mg-S) batteries are an alternative electrochemical energy-storage system with higher safety as well as large theoretical volumetric energy density than lithium-sulfur (Li-S) batteries. Herein, we further research sulfurized-pyrolyzed polyacrylonitrile (S@pPAN) composite containing 47.3 wt% sulfur as cathode of Mg-S batteries with nucleophilic (PhMgCl) 2 -AlCl 3 + LiCl/THF electrolyte. Except a significant restraint of the reaction between the nucleophilic electrolyte and the electrophilic sulfur, polysulfide dissolution and shuttle are effectively suppressed. Electrochemical performance is further enhanced using MBA-(MgCl 2 ) 2 -(AlCl 3 ) 2 + LiCl/THF non-nucleophilic electrolyte with 677.9 mAh g −1 specific capacity and 75.9% cycling stability after 85 cycles at 0.1C. More effective CEI layers formed on the cathode with a lower electrode/electrolyte internal resistance play a key effect on the enhanced electrochemical performance. This work will attract extensive study on Mg-S batteries containing easily prepared electrolytes with a combination of S@pPAN cathode.
研究领域:
电化学
·
储能材料
·
电池技术
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Biyi Xu,Huanan Duan,Hezhou Liu,Chang−An Wang,Shengwen Zhong
To improve the solid-electrolyte/electrode interface compatibility, we have proposed the concept of hybrid electrolyte by including a small amount of liquid electrolyte in between. In this work, n-BuLi, a superbase, has been found to significantly improve the cycling performance of LiFePO4/Li hybrid cells containing Li7La3Zr1.5Ta0.5O12 (LLZT) and conventional carbonate-based liquid electrolyte. The modified cells have been cycled for 400 cycles at 100 and 200 μA cm–2 at room temperature, indicating excellent solid/liquid electrolyte interface stability. The role of n-BuLi may be 3-fold: to retard the decomposition reaction of LE, to suppress the Li+/H+ exchange, and to lithiate the garnet/LE interface, inhibiting side reactions and enhancing interfacial lithium-ion transport.
研究领域:
材料科学
·
电化学
·
储能技术
·
固态电池
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Fangjun Ye,Jiafei Gao,Xiaolin Yan,Hongfei Zheng,Wei He,Liang Lin,Fang Liu,Shasha Qu,Qingshui Xie,Qing Luo,Dong-Liang Peng
The practical application of Li metal anode is hindered by the uncontrollable dendrites growth, severe side reactions and huge volume fluctuation, which would result in low Coulombic efficiency (CE) and poor cycling performance. Herein, a 3D Li host is functionalized by a low-cost and environment-friendly polyvinyl alcohol (PVA) layer via a facile solution immersion method to solve the above issues. The polymer layer can act as a stable artificial SEI with high ionic conductivity during cycling, so as to isolate the direct contact between Li metal and electrolyte and then avoid interfacial side reaction. In addition, the abundant hydroxyl (−OH) polar groups in PVA, which own a strong binding energy with Li atoms, can effectively regulate Li plating/stripping behaviors on the 3D framework. As a result, the symmetric cell using PVA-Cu mesh-Li electrode delivers a superior long-term stability over 1000 h with a low average voltage hysteresis of 17 mV at 1 mA cm −2 . And the PVA-Cu mesh-Li || LiFePO 4 full cell can remain a high discharge capacity of 104.4 mAh g −1 and a high CE of 99.1% after 350 cycles at 5 C.
研究领域:
材料科学
·
储能
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）