CHEMICAL ENGINEERING SCIENCE
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2023
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IF 4.7
Xiaorong Meng,Yue Jing,Jiaming Li,Zhengmeng Sun,Zhenpeng Wu
Lithium extraction from salt lakes has become a hot research issue in recent years, and LiMn 2 O 4 -based electrochemical lithium extraction is considered to be one of the most promising technologies for application. However, LiMn 2 O 4 limits its further application due to the dissolution of Mn and the Jahn-Teller effect. In this study, a LiNi 0.05 Mn 1.95 O 4 (LNMO-0.05) lithium-extraction electrode material with truncated octahedral characteristics was prepared. The special crystal surface structure enhanced the diffusion and adsorption rates of Li + , whereas Ni doping effectively suppressed the Jahn-Teller effect, and the two mechanisms synergistically enhanced the lithium extraction performance of LMO. In lithium extraction from East Taijiner brine with an Mg/Li ratio of 46, LNMO-0.05 showed excellent ion selectivity (α Mg-Li = 214.08), high lithium extraction capacity (20.99 mg/g) and no significant capacity decay occurred after 10 cycles. These excellent properties make the LNMO-0.05 electrode suitable for industrial electrochemical lithium extraction.
研究领域:
电化学
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材料科学
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环境科学
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能源技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Shuting Wen,Linlin Zhou,Ling Chen,Yaoguo Fang,Qian Cheng,Haifeng Yu,Hao Jiang
High-safety and low-cost Na 4 Fe 1.5 Mn 1.5 (PO 4 ) 2 (P 2 O 7 ) (NFMPP) is a highly promising cathode for Na-ion batteries (SIBs), offering a higher energy density than typical NFPP. However, its performance is hindered by Na/Mn anti-site defects and Jahn-Teller (J-T) distortion, resulting in voltage hysteresis and sluggish Na-ion diffusion kinetics. Herein, we demonstrate a high-rate and long-life NFMPP cathode by synergistically optimizing the initial molar ratio of Na-ion to transition metal (Na/TM) and vanadium (V) doping. The Na/Mn anti-site defects have been greatly alleviated from 5.9 % to 2.2 %, effectively suppressing the voltage hysteresis of Mn 2+ /Mn 3+ redox plateau. Meantime, the electron-rich V doping with strong V-O bonds (541 kJ/mol) exhibits strong interaction with Mn, significantly reducing the effect of J-T distortion on Na-ion diffusion. As a consequence, the optimized NFMPP cathode delivers a superior initial charge capacity of 115.1 mAh/g at 0.1C and achieves a high reversible energy density of 334 Wh/kg, surpassing many reported phosphate-based cathodes. It also exhibits exceptional cycling stability, retaining 94.1 % of its capacity after 500 cycles, making it a highly competitive candidate for next-generation SIBs.
研究领域:
材料科学
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电化学
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能源存储
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无机化学
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固体化学
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电池技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
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2025
·
IF 4.7
Bao-Yi Jian,Xin-Ye Ren,Chen-Yu Dong,Lian-Cai An,Song-De Han,Guo-Ming Wang
Molecular piezoelectrics have garnered significant attention in energy harvesting and sensing fields due to their high intrinsic piezoelectricity, low elastic properties, and excellent solution processability. Recent efforts have primarily focused on rationally tuning the piezoelectric performance of these materials through the molecular predesign of organic components. However, the regulation of piezoelectric properties via the central metal ion has remained relatively underexplored. Herein, we report the mechanical properties and the piezoelectric output performances of three isostructural molecular piezoelectrics, [PhB(pz)3]2TM (PhB = phenylboronic acid, pz = pyrazole, TM = Fe(II), 1-Fe; Co, 2-Co; Ni, 3-Ni), via first-principles calculations and piezoelectric experiments. Compared with 1-Fe and 3-Ni, 2-Co shows an enhanced structural distortions arising from Jahn–Teller effect, the unequal occupancy of degenerate orbitals of 3d7 and enhanced polarization degree. The composite films of 2-Co dispersed in poly(butyleneadipate-co-terephthalate) (PBAT) are fabricated as piezoelectric generators (PEGs) and display enhanced performances with open-circuit voltages (Voc) of 3.5 V, and short-circuit current (Isc) of 1.4 μA. Moreover, 2-Co PEG can successfully detect human motion sensing including fingertip taping, finger bending, and walking. This work emphasizes the importance of the Jahn–Teller effect in molecular piezoelectrics and provides a strong tool to design and engineer the piezoelectric performance.
研究领域:
材料科学
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物理化学
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纳米能源
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功能材料
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压电器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
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2025
·
IF 9.8
Jicong Zhang,Luwei Shi,Sheng Fei Zhao,Yan Lin,Tao Hu,Ulla Lassi,Ruguang Ma,Chang Ming Li
Na 4 MnV(PO 4 ) 3 is a typical Na-super-ionic-conductor (NASICON), which shows great promise as cathode material for high-performance cost-effective sodium ion batteries. However, sluggish Na + diffusion kinetics coupling with Jahn-Teller effect severely deteriorate its high-rate capability and long-term stability. In this work, we report a regulation strategy of jointly doping dual heteroatoms (Fe and Ni) to realize structural stability of Na 4 MnV(PO 4 ) 3 by shortening bond length and fast ion diffusion. The FMVN electrode delivers a highly reversible capacity of 98 and 79 mAh g −1 at 0.1C and 10C, respectively, while maintaining a stable cycling life over 2000 cycles at 10C. Theoretical calculations and kinetic analysis unveil that the regulation of crystal structure by Fe and Ni joint substitution effectively reduces the Na + migration barrier and simultaneously increases the reversible capacity. Additionally, in-situ x-ray diffraction investigation verifies reversible structure evolution and minor volumetric change (∼4.91 %) in the sodiation/desodiation process. An assembled full cell (FMVN||HC) demonstrates an energy density of 353.9 Wh kg −1 at 0.1C and outstanding cycling durability with 89 % capacity retention after 100 cycles at 2C. This dual substitution strategy in this work holds great promise to develop high-performance NASICON-type cathodes for practical applications.
研究领域:
材料科学
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电化学
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储能技术
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无机化学
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纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Zhongjun Zhao,Yiran Sun,Yihao Pan,Jing Liu,Jingkai Zhou,Mei Ma,Xiaozhong Wu,Xiangyan Shen,Jin Zhou,Pengfei Zhou
Layered Mn-based cathode (K x MnO 2 ) has attracted wide attention for potassium ion batteries (PIBs) because of its high specific capacity and energy density. However, the structure and capacity of K x MnO 2 cathode are constantly degraded during the cycling due to the strong Jahn-Teller effect of Mn 3+ and huge ionic radius of K + . In this work, lithium ion and interlayer water were introduced into Mn layer and K layer in order to suppress the Jahn-Teller effect and expand interlayer spacing, respectively, thus obtaining new types of K 0.4 Mn 1-x Li x O 2 ·0.33H 2 O cathode materials. The interlayer spacing of the K 0.4 MnO 2 increased from 6.34 to 6.93 Å after the interlayer water insertion. X-ray photoelectron spectroscopy studies demonstrated that proper lithium doping can effectively control the ratio of Mn 3+ /Mn 4+ and inhibit the Jahn-Teller effect. In-situ X-ray diffraction exhibited that lithium doping can inhibit the irreversible phase transition and improve the structural stability of materials during cycling. As a result, the optimal K 0.4 Mn 0.9 Li 0.1 O 2 ·0.33H 2 O not only delivered a higher capacity retention of 84.04 % compared to the value of 28.09 % for K 0.4 MnO 2 ·0.33H 2 O, but also maintained a greatly enhanced rate capability. This study provides a new opportunity for designing layered manganese-based cathode materials with high performance for PIBs.
研究领域:
储能材料
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电化学
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电池技术
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材料科学
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无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Bao Zhang,Yongkang Liu,Yunfeng Gu,Ziliang Feng,Enfeng Zhang,Peng Luo,Quanyi Zhang,Peng Dong,Yingjie Zhang,Yannan Zhang
Spinel lithium manganate (LiMn 2 O 4 ) is considered a highly promising cobalt-free cathode material for lithium-ion batteries (LIBs) owing to its three-dimensional Li-ion diffusion channels and the abundance of manganese. However, its practical applications are limited due to the substantial capacity deterioration induced by the Jahn-Teller effect and interfacial instability with the organic electrolyte. In this work, we propose a polyanion-based surface engineering strategy that enables simultaneous doping and the formation of a protective coating on the LiMn 2 O 4 cathode. Boric acid surface modification can selectively stabilize the MnO₆ octahedron, while effectively suppressing manganese dissolution and interfacial side reactions. Additionally, the partial surface boron component reacts with PF 6 − in the electrolyte to form thermodynamically stable BF 4 − , which reduces the generation of HF in the electrolyte and stabilizes the cathode electrolyte interphase (CEI). Therefore, the modified BO3-LMO exhibits remarkable cycling stability, with a capacity retention rate of 80.6 % after 900 cycles at 1C, which is significantly superior to that of the unmodified LMO (61.1 %). Additionally, the BO3-LMO demonstrates excellent rate capability and thermal stability, retaining high performance even at elevated temperatures (55 °C) and under high-rate operation (5C). Through a combination of advanced characterization techniques—such as XRD refinement, XPS, HR-TEM and density functional theory calculations, we uncover the origins of the improved electrochemical stability after surface modification. The BO3-LMO demonstrates a higher density of states at the Fermi level, stronger Mn O electron bonding, and a lower lithium-ion diffusion energy barrier. This integrated strategy not only solves the interfacial instability and structural degradation challenges but also establishes a scalable strategy for designing high-performance, cobalt-free spinel manganese-based lithium-ion batteries (LIBs).
研究领域:
材料科学
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电化学
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储能技术
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表面工程
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）