ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Chuanliang Wei,Huifang Fei,Yongling An,Yuchan Zhang,Jinkui Feng
Spinel LiMn 2 O 4 is considered to be a promising cathode for lithium-ion batteries owing to its low cost, safety, environmental friendliness , high operating voltage and natural abundance of manganese. However, the accelerated dissolution of manganese at elevated temperature results in serious capacity fading, which inhibits its further application in energy storage systems. The dissolution of manganese is mainly caused by the attack of trace acidic species (HF) in liquid electrolyte . Here, we report a facile, universal and effective strategy to suppress the dissolution of manganese at 55 °C by encapsulating LiMn 2 O 4 particles in crumpled Ti 3 C 2 T x nanosheets using an electrostatic self-assembly process. With high electronic conductivity and fast Li + transport capability, such protective layer reduces direct contact between liquid electrolyte and LiMn 2 O 4 particles, suppressing the dissolution of manganese. The composite exhibits larger discharge specific capacity, enhanced rate and cycling capabilities. The capacity retention ratio can be improved by 18.3% at 55 °C after 200 cycles at 2 C. This study provides a new strategy for suppressing the dissolution of manganese at high temperature and widens the road for the application of 2D MXene in energy storage field. The electrostatic self-assembly strategy we proposed is universal and can be applied in other cathode materials, which can arouse much interest of relevant researchers.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Seokyoung Choi,Wuliang Feng,Zhongzhu Liu,Yongyao Xia
Spinel LiMn 1.5 Ni 0.5 O 4 (LMNO) is one of the promising cathode materials for the next generation Li-ion batteries due to its voltage platform. However, the dissolution of the transition metal at high voltage is the biggest obstacle that LMNO suffers from. In this study, we successfully suppressed transition metal dissolution in LMNO by the morphology control from regular octahedron to spherical. Niobium was integrated as a dopant, which restricted the growth of (1 1 1) crystal face, and increased the indices of crystal faces by homogenizing the surface energy. By changing to a smaller surface area with spherical morphology, the contact area with the electrolyte was reduced, thus suppressing the dissolution of the Mn ion. Consequently, the niobium-doped LMNO exhibited superior rate performance, capacity retention with 74.1% at 1C after 500 cycles in half-cell, and thermal stability compared to pristine LMNO.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2021
·
IF 4.156
Luri Bao,Jingze Zhang,Jie Wu,Guotai Zhang,Yang Yang,Weiping Tang,Mei Xue
Owing to the increasing global demand for lithium, extraction of lithium from salt lake brine water has received considerable attention. In this study, the magnesium doping to produce Li 1.6 Mg x Mn 1.6-x O 4 (LMMO) was designed to overcome the limitation caused by the loss of Mn due to dissolution. The chemical and morphological properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The XRD results confirmed that the crystal structure of Li 1.6 Mn 1.6 O 4 was retained after Mg-doping. Scanning electron microscopy and energy-dispersive X-ray spectroscopy showed that LMMO has a flake-shaped structure and the Mg 2+ ions were uniformly distributed in the precursor. The doping of Mg 2+ led to the decrease of Mn 3+ content in the precursor, improving its structural stability. The adsorption capacity of LMMO-6% was 35.6 mg g −1 , which was greater than that of the undoped sample (33.2 mg g −1 ). After the tenth cycle, the dissolution loss of Mn in LMMO-6% was 0.55%, and it is smaller than that for lithium manganese oxide (0.94%). Results confirm that the structural stability was improved compared to undoped adsorbents. Moreover, batch adsorption experiments demonstrated the potential of the HMMO-6% adsorbent to be used for lithium adsorption from real salt lake brine.
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
Journal of Energy Chemistry
·
2018
·
IF 3.886
Aikai Yang,Xingchao Wang,Yong Lu,Licheng Miao,Wei Xie,Jun Chen
Organic carbonyl compounds are considered as promising candidates for lithium batteries due to their high capacity and environmental friendliness. However, they suffer from serious dissolution in the electrolyte, leading to fast capacity decay. Here we report core-shell structured 1,4-benzoquinone@titanium dioxide (BQ@TiO 2 ) composite as cathode for lithium batteries. The composite cathode can deliver a high discharge capacity of 441.2 mA h/g at 50 mA/g and a high capacity retention of 80.7% after 100 cycles. The good cycling performance of BQ@TiO 2 composite can be attributed to the suppressed dissolution of BQ, which results from the physical confinement effect of TiO 2 shell and the strong interactions between BQ and TiO 2 . Moreover, the combination of ex situ infrared spectra and density functional theory calculations reveals that the active redox sites of BQ are carbonyl groups. This work provides an alternative way to mitigate the dissolution of small carbonyl compounds and thus enhance their cycling stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 19
·e202400538
·
IF 1.9
Anna Zhou,Zhe Li,Dan Li,Chunni Cheng,Xiang Chen,Qunfang Wang,Alice A. Kasera,Jianhui Li,Qiong Hou,Ronghua Zeng
Graphical The triphenylamine (TPA) with high discharge plateau and benzoquinone (BQ) with high theoretical capacity are used to synthesize the polymer (poly triphenylamine-benzoquinone (PTPA-BQ)) as cathode for lithium ion batteries, which can enhance the discharge plateau and effectively inhibit the dissolution of BQ small molecules simultaneously. Benzoquinone (BQ) electrode is regarded as next generation energy storage material for lithium ion batteries (LIBs) because of its advantages of high theoretical specific capacity, abundant source, environmental friendliness. However, the two key challenges, the dissolution of BQ in organic electrolyte and the low discharge plateaus, impede practical application of BQ as cathode. Here, triphenylamine (TPA) with high working voltage and BQ with high theoretical capacity are used to synthesize triphenylamine-benzoquinone monomer (TPA-BQ) and its polymer (poly triphenylamine-benzoquinone (PTPA-BQ)) as cathodes for LIBs. The charge/discharge results reveal that the discharge plateaus of TPA-BQ and PTPA-BQ increase from ~2.5 V to ~3.5 V, and PTPA-BQ exhibits high discharge capacity and remarkable cyclic stability compared with TPA-BQ. The electrochemical mechanism shows that the redox peak potential of ~2.3 V/~2.2 V are assigned to the insertion/extraction of lithium ion in C=O groups of BQ, while at high potential of ~3.6 V/~3.5 V corresponds to the de-dope/dope of the PF 6 − anion in TPA unit. The results demonstrate TPA was introduced BQ into small molecule to form PTPA-BQ polymer that can improve discharge plateaus and charge/discharge performance of BQ small molecule, which provide guides for solving the dissolution and discharge platforms of the other organic electrode materials.
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
NANO LETTERS
·
2020
·
IF 11.238
Xiao Wang,Baojuan Xi,Xiaojian Ma,Zhenyu Feng,Yuxi Jia,Jinkui Feng,Yitai Qian,Shenglin Xiong
Vanadium-based compounds with an open framework structure have become the subject of much recent investigation into aqueous zinc-ion batteries (AZIBs) due to high specific capacity. However, there are some issues with vanadium dissolution from a cathode framework as well as the generation of byproducts during discharge that should not be ignored, which could cause severe capacity deterioration and inadequate cycle life. Herein, we report several barium vanadate nanobelt cathodes constructed of two sorts of architectures, i.e., Ba1.2V6O16·3H2O and BaV6O16·3H2O (V3O8-type) and BaxV2O5·nH2O (V2O5-type), which are controllably synthesized by tuning the amount of barium precursor. Benefiting from the robust architecture, layered BaxV3O8-type nanobelts (Ba1.2V6O16·3H2O) exhibit superior rate capability and long-term cyclability owing to fast zinc-ion kinetics, enabled by efficiently suppressing cathode dissolution as well as greatly eliminating the generation of byproduct Zn4SO4(OH)6·xH2O, which provides a reasonable strategy to engineer cathode materials with robust architectures to improve the electrochemical performance of AZIBs.
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
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Lei Tan,Zhao Li,Lei Wang,Yu Shang,Zhiguo Wang,Zhengwang Tong,Yan Li,Xiangming Li
Layered vanadium oxide materials exhibit significant multielectron redox reactions and regulatable transfer channels for Zn 2+ insertion/extraction in rechargeable aqueous zinc-ion batteries (AZIBs). However, vanadium dissolution poses a severe challenge to achieving stable performance in AZIBs. In this work, we report an in-situ polymerization of polyaniline (PANI) on ZnV 2 O 4 (ZVO) materials, resulting in a cross-interlocked nanosheet morphology to inhibit vanadium dissolution. The high conductivity and unique π-conjugated structure of PANI effectively weaken the electrostatic interactions between Zn 2+ and the V-O layers, thereby enhancing the diffusion of Zn 2+ at the electrode material interface, suppressing the vanadium dissolution of ZnV 2 O 4 and stabilizing its structure framework. Concurrently, density functional theory (DFT) calculations further confirm that PANI can significantly modulate the electronic properties of the ZVO matrix. PANI forms robust hydrogen bonds with ZVO, resulting in an abundance of free Zn ions within the system, which accelerates electron/ion transfer kinetics, thereby enhancing the efficient storage performance of Zn 2+ and increasing specific capacity. The ZVO@PANI composite electrode exhibits high specific capacity (706.4 mAh g −1 at 0.1 A g −1 ), remarkable rate capability (350.2 mAh g −1 at 5 A g −1 ), and robust cycling performance. This study provides a reasonable strategy for designing high-performance cathode materials for aqueous zinc-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
Energy Material Advances
·
2022
·
IF 0
Renjie He,Sheng Lei,Mengchuang Liu,Mingsheng Qin,Wei Zhong,Shijie Cheng,Jia Xie
Microspinel LiMn2O4 (LMO) is a widely used cathode material in power lithium-ion batteries. However, inevitable Mn dissolution and dynamic phase instability will cause the degradation of microspinel LMO during cycling. Here, a low-tortuosity LMO (LMO-LT) electrode is fabricated by an ice-templating method, which exhibits enhanced dynamic phase stability, alleviated Mn dissolution, and rare particle microcracks during cycling. It is shown that the low-tortuosity electrode enables fast lithium-ion diffusion and thus small concentration polarization, leading to uniform electrochemical reaction within microregions of the LMO-LT electrode. Furthermore, the fast lithium-ion transport kinetics and even mesoscopic scale reactions of the LMO-LT electrode effectively alleviate irreversible phase transition and Mn dissolution as well as suppress crack generation in LMO particles. As a result, the full cell [negative-to-positive capacity ratio (N/P) = 1.1] with thick LMO-LT cathode (13 mg cm−2) and Li4Ti5O12 anode sustains 80.0% capacity over 200 cycles. The LMO-LT electrode further delivers 78.9% capacity of that at 0.1 C at the high rate of 5 C. This work provides an important strategy to enhance dynamic phase stability and suppress Mn dissolution at the mesoscopic scale, promoting the development of high-performance LMO electrodes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shuyue Li,Dongxu Yu,Lina Liu,Shiyu Yao,Xiaoqi Wang,Xu Jin,Dong Zhang,Fei Du
Rechargeable aqueous zinc-ion batteries (AZIBs) have attracted widespread attention as a sustainable energy storage system owing to the safe aqueous electrolyte. Manganese-based materials are potential cathodes for AZIBs, whereas, the dissolution of manganese would result in the significantly decline of capacity and unsatisfied lives. Herein, an in-situ electrochemical induced artificial solid electrolyte interphase (SEI), (Zn(OH) 2 ) 3 (ZnSO 4 )(H 2 O) 5 nanoflakes, is discovered to generate and coat on the surface of MnO@C in the initial charging process which could prevent the direct contact between the electrolyte and electrode with the result of inhibiting the excessive dissolution of manganese oxides. Benefiting from the artificial SEI, MnO@C exhibits an extremely excellent cycle performance with 0.003% capacity decay per cycle over 10,000 cycles without Mn 2+ additive in electrolyte. Moreover, MnO@C is proved to demonstrate a (de)intercalation reaction mechanism after the electrochemical activation process in initial charging process. The strategy proposed in this study provides a new proposal to develop high stable manganes oxide cathodes for AZIBs.
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 Applied Materials & Interfaces
·
2022
·
IF 10.383
Yan Li,Jipeng Xu,Huibin Liu,Xuewen Hu,Qicheng Zhang,Wenchao Peng,Yang Li,Fengbao Zhang,You Han,Xiaobin Fan
Low-cost sodium-ion-based electrochemical energy storage devices, especially vanadium-based sodium-ion pseudocapacitors, are receiving increasing attention. However, the inevitable dissolution of vanadium in aqueous electrolytes usually leads to poor cycling stability and a narrow electrochemical stability window (ESW). In this study, we prepared layered (NH4)2V10O25·8H2O with a hierarchical flower-like structure and an ultralarge layer spacing and evaluated its potential as a sodium-ion pseudocapacitive material. Ex situ X-ray diffraction (XRD) measurement and kinetic analysis demonstrate the reversible intercalation and deintercalation of Na+ in (NH4)2V10O25·8H2O in NaClO4 electrolytes. Significantly improved durability and a large voltage window of 3.2 V are achieved in the high-concentration NaClO4 electrolyte. Inductively coupled plasma-optical emission spectroscopy (ICP-OES) analysis and molecular dynamics (MD) simulations reveal that the dissolution of vanadium in the high-concentration NaClO4 electrolyte can be effectively suppressed. An asymmetric sodium-ion capacitor with a wide voltage window of 3.2 V was successfully assembled, and it delivered a high energy density of 53.1 Wh kg–1 at a power density of 3.2 kW kg–1.
研究领域:
材料科学
·
电化学储能
✓ 已验证
DOI
高影响因子
Small
·
2021
·Vol. 18
·期 6
·2104538
·
IF 13.281
Yihong Liang,Wanbao Wu,Jinwei Cao,Ruitian Guo,Miaomiao Cao,Jichuan Zhang,Mi Wang,Wen Yu,Jiaheng Zhang
Small molecule organic acids as electrode materials possess the advantages of high theoretical capacity, low cost, and good processability. However, these electrode materials suffer from poor cycling stability due to the inevitable dissolution of organic molecules in the electrolytes. Here, a eutectic mixture of lithium bis(trifluoromethanesulfonyl)imide and N -methylamine is employed as a eutectic electrolyte in Li-ion batteries with small molecule organic acids as electrodes. To enhance the cycling stability of the electrolyte, fluoroethylene carbonate is used as an additive. The electrolyte exhibits nonflammability, high ionic conductivity, and good electrochemical stability. Molecular dynamics simulations and density functional theory are performed to further investigate the solvation chemistry of the eutectic electrolyte. The well-designed eutectic electrolyte inhibits the dissolution of terephthalic acid effectively and displays superior performance with a capacity retention of ≈84% after 2000 cycles at a high current density of 1 A g −1 . It also enables stable cycling of more than 900 cycles at a high current density of 2 A g −1 at 60 °C. This study provides a strategy to enhance the cycling stability and safety of Li-ion batteries with organic electrode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Fan Feng,Suli Chen,Shiqiang Zhao,Wenli Zhang,Yigao Miao,Haiying Che,Xiao-Zhen Liao,Zi-Feng Ma
Sodium manganese hexacyanoferrate (PBM) is one of the most promising cathode materials for sodium-ion batteries due to its high theoretical capacity, high voltage, and low cost. However, its cycling performance is limited by serious Mn ions dissolution during Na + insertion/extraction. In this work, a facile in situ ion-exchange strategy is developed to synthesize sodium manganese hexacyanoferrate coated by sodium nickel hexacyanoferrate (PBM@PBN). The as-prepared PBM@PBN showed superior cyclic stability and enhanced rate capability. PBM@PBN exhibited a high reversible capacity of 126.9 mAh g −1 (1 C), with a capacity retention of 74.3% after 800 cycles. ICP results proved that superior cyclic stability was attributed to the inhibition of Mn ions dissolution by PBN coating. Besides, PBM@PBN also exhibited enhanced rate capability, and it delivered a high capacity of 87.2 mAh g −1 at 10 C. Ex -situ XRD proved that the PBM@PBN undergoes a reversible structural change (monoclinic ↔ cubic/tetragonal) during the whole cycle. PBN coating inhibited the PBM from suffering serious Mn ions dissolution during Na + insertion/extraction, thus ensured the framework stability of PBM during long-term cycling and contributed to the excellent electrochemical performance. The simple preparation of PBM@PBN makes it accessible for large-scale applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）