CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Weikang Zheng,Zongyang Li,Guanjie Lu,Tongxin Yang,Menghong Li,Chaohe Xu,Ronghua Wang
Lithium-ion capacitors (LICs) possess high energy density and power density simultaneously. However, for balancing electrochemical performance, mechanical properties and safety issues, the development of high-performance electrodes and electrolytes is still a challenge in this field. Herein, a 3D nitrogen-doped carbonaceous foam (N C) was synthesized by chemical vapor deposition (CVD), and the covering of poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP) dramatically increase its flexibility without decreasing the electrochemical performance. The complete quasi-solid-state LICs using N C/PVDF-HFP as anode, N C/activated carbon (AC)/PVDF-HFP as cathode and PVDF-HFP as the skeleton of gel electrolyte are fabricated and shows good cycle stability (72.2 % after 2000 cycles). Meanwhile, the power density of the LIC can reach up to 342.5 W/kg when the energy density is 209.3 Wh/kg, and the power density can reach as high as 7632.2 W/kg at energy density of 77.6 Wh/kg, which is higher than many other dual-carbon and quasi-solid-state LICs.
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 41
·期 1
·95-107
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IF 3.815
Xie Zhen-Hua,Huang Zi-Xin,Zhang Ze-Ping,Rong Min-Zhi,Zhang Ming-Qiu
To construct structurally stable sulfur cathode of Li-S battery with improved cycling performance, poly(acrylic acid) (PAA) crosslinked by cationic hydroxypropyl polyrotaxane (HPRN + ) via dynamically reversible boronic ester bonds is synthesized and serves as the cathode binder. The smart polymer networks offer multifunction including buffering the volume change of the cathode during charge/discharge through the pulley effect of polyrotaxanes (PR), suppressing the shuttle effect by adsorption of polysulfide using the plentiful carboxyl, hydroxyl and quaternary ammonium cationic groups, and self-healing the micro-damages to ensure stable conduction pathways of the electrode. As a result, the Li-S batteries based on this novel multifunctional binder and simple commercial sulfur/carbon composites cathode exhibit excellent specific capacity and cycling stability. In particular, the specific capacity decay per cycle of the cell is only 0.064% along with high Coulombic efficiency after 550 cycles at 1.0 C, which is superior to most of the reported binders. Even under high sulfur loading, moreover, the cathode can deliver superior areal capacity and cycling stability. This proposed binder provides a new way for the design of high-stability sulfur cathodes.
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高影响因子
JOM
·
2022
·Vol. 74
·期 12
·4672-4681
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IF 2.597
Zhang Bao,Zhang Yingjie,Zhang Qi,Gao Yifeng,Zhu Bowen,Gong Rui,Wang Zhengwu,Bu JiaoJiao,Lian Zheng,Zhou Kai,Dong Peng,Zhang Yannan
Lithium ion spinel lithium manganate (LiMn 2 O 4 ) is a promising positive material due to its typical three-dimensional network as well as abundant manganese sources. However, the electrodes suffer from severe capacity degradation on account of the Jahn–Teller effect and spontaneous disproportionation reactions. In this work, we have fabricated Sm 3+ , Mo 6+ dual-doped LiMn 2 O 4 -positive materials using a facile solid phase strategy. Electrochemical test results show that the discharge capacity and capacity retention of the LMO-Sm&Mo material reaches 101.30 mAh g −1 and 88.08% after 200 cycles (85.69 mAh g −1 and 76.32% for LMO) at 1 C, which results from the synergistic enhancement of the double-cation (Sm 3+ , Mo 6+ ) doping strategy. Even at 10 C, LMO-Sm&Mo still exhibits a promising specific discharge capacity of 98.71 mAh g −1 . Moreover, ICP analysis indicates that the manganese dissolution of LMO-Sm&Mo in organic electrolyte is much lower than that of the undoped sample (LMO). Overall, the results indicate that the Sm 3+ , Mo 6+ co-doping is an effective strategy for enhancing the structural stability and electrochemical properties of spinel Mn-based positive electrodes.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xuting Li,Zhanghua Fu,Jing Wang,Xinhong Zhao,Yukun Zhang,Weizhe Liu,Qiong Cai,Cheng Hu
The application of Li metal anodes in high energy–density batteries is hindered by the uncontrolled dendrite growth and rapid capacity fading. Herein, we demonstrate that dilithium phthalocyanine (Li 2 Pc) is highly effective for the regulation of ion solvation and transport towards dendrite-free Li metal anodes. The strong interactions of Li 2 Pc with the solvents generate an apparent solvation sheath surrounding the large phthalocyanine ligand, where the dipole–dipole interactions of the solvents are weakened. This promotes the anion solvation in the outer solvation sheath, which suppresses the mobility of the anions for apparently increased Li + transference number and facilitates the dissociation of the solute for a higher ionic conductivity. The resulting uniform Li + flux alleviates the space charge to impede the growth of dendrites. Stable Li plating/stripping of 800 h (1 mA cm −2 , 1 mAh cm −2 ) and dendrite-free Li deposition up to 10 mA cm −2 , 10 mAh cm −2 are achieved in Li/Li cells and the Li/Cu cells exhibit a high average CE of 98.3% over 150 cycles at 1 mA cm −2 , 1 mAh cm −2 . Stable cycling of Li-S full cells at the condition of N:P = 2:1 are also demonstrated with high average CEs of 98.29%.
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高影响因子
RARE METALS
·
2021
·Vol. 41
·期 4
·1265-1275
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IF 4.003
Tian Kang-Hui,Duan Chan-Qin,Ma Qun,Li Xing-Long,Wang Zhi-Yuan,Sun Hong-Yu,Luo Shao-Hua,Wang Dan,Liu Yan-Guo
High entropy oxides (HEOs), as a new type of single-phase multielement solid solution materials, have shown many attractive features and promising application prospect in the energy storage field. Herein, six-element HEOs (CoNiZnFeMnLi) 3 O 4 and (CoNiZnCrMnLi) 3 O 4 with spinel structure are successfully prepared by conventional solid-phase method and present outstanding lithium storage performances due to the synergy effect of various electrochemically active elements and the entropy stabilization. By contrast, (CoNiZnFeMnLi) 3 O 4 delivers higher initial discharge specific capacity of 1104.3 mAh·g −1 , better cycle stability (84% capacity retention after 100 cycles at 100 mA·g −1 ) and rate performance (293 mAh·g −1 at 2000 mA·g −1 ) in the half-cell. Moreover, the full-cell assembled with (CoNiZnFeMnLi) 3 O 4 and LiCoO 2 provides a reversible specific capacity of 260.2 mAh·g −1 after 100 cycles at 500 mA·g −1 . Ex situ X-ray diffraction reveals the electrochemical reaction mechanism of HEOs (CoNiZnFeMnLi) 3 O 4 , and the amorphous phase and the large amount of oxygen vacancies were obtained after the initial discharge process, which are responsible for the excellent cycle and rate performance. This research puts forward fresh insights for the development of advanced energy storage materials for high-performance batteries. Graphical Abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2021
·Vol. 56
·期 36
·20126-20137
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IF 4.22
Yang Jiyuan,Shi Minghui,Wu Wei,Zhang Qunchao,You Jun,Shi Dean,Jiang Tao
Silicon has become one of the most emerging anode materials in Li-ion batteries due to its excellent specific capacity. The incorporation of binders can significantly reduce the volume expansion of silicon during the cycling process. In this work, a novel type of cross-linked siloxane-based copolymer, poly (tert-butyl acrylate-co-vinyl tri-lactate ethyl silane) (TBA-VTLES) was designed and utilized as the binder for the silicon anode in Li-ion batteries to alleviate the inner stress of adverse volume changes and improve the electrochemical performance. The hard TBA and soft VTLES were interwoven into a 3D network to achieve the adhesive action via free radical polymerization. The soft chains in TBA-VTLES can enhance the cohesion of the copolymer to disperse residual stress, and thus avoid structural damage during lithiation. Meanwhile, the rigid chains can provide sufficient mechanical strength to maintain the integrity of silicon anode during de-lithiation. Moreover, the presence of TBA-VTLES can improve the adhesive strength between the copper collector and the binder. This novel type of siloxane-based copolymer binder with hardness and softness provides a feasible way to improve the silicon anode performance of Li-ion batteries. Graphical abstract
The synthesized cross-linked copolymer binder can improve the interfacial interaction and electrochemical performance of Si anode-- present in Graphical abstract figure-- need or not.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Quan Li,Huan Liu,Benqiao He,Wenxiong Shi,Yanhong Ji,Zhenyu Cui,Feng Yan,Younas Mohammad,Jianxin Li
Efficient separation of Mg 2+ and Li + remains a major challenge in the extraction of lithium from salt lake brine. In this work, an electro-nanofiltration (NF) process was employed to separate Mg 2+ and Li + from the MgCl 2 /LiCl feed solution under a current density of 0–2.83 mA cm −2 and at an operating pressure of 5 bar. The surface chargeability of the NF membrane under an electric field (EF) was investigated in detail by combination of the experiment and theoretical simulation. It was found that Mg 2+ ions were almost completely rejected (no Mg 2+ detected by an ICP-OES with a determination limit of 0.01 ppm). A high permeance of Li + (0.55 molm −2 h −1 ) and a stable solution flux of 75 ± 2 Lm −2 h −1 were achieved. The separation performance was far better than the results reported in the literature until now. It was believed that high positive charges on the negative-charged NF membrane surface were in-situ reconstructed and enhanced with the increase in current density due to the complexion and enrichment of Mg 2+ on the membrane surface, leading to the high rejection for Mg 2+ . The dehydration of Li + ions with a low hydration energy under EF promoted the permeance of Li + . This work provides a practical route for efficient separation of Mg 2+ /Li + , and would have a huge potential in the extraction of high-pure Li + salt from salt lakes.
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高影响因子
CARBOHYDRATE POLYMERS
·
2021
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IF 9.381
Leixin Deng,Yongqin Wang,Chenyang Cai,Zechang Wei,Yu Fu
The dendrites is deemed to be one of the most crucial problems for lithium-ion batteries because it hampers their safety and cycling performance severely. Herein, a cellulose acetate-based separator with uniformly distributed nanopores was engineered and successfully prepared through a simple one-step process. The controlled nanopores promoted uniform transmission of ions and the cellulose acetate backbone inhibited the transference of anions, and prevented large-scale accumulation of lithium ions , thereby restricting the nucleation and growth of dendrites. The 3D-networked separator exhibited capacity retention of 78.6% after 900 cycles at 1C, with the breaking elongation and the strength increased by 620% and 28.4%, respectively, which originated from the porosity controlling of the nanofiber inter-bridging. The nanopore-assembled structure of 3D-hierarchy with MOFs provided the channels for the lithium ions transference through the separator and hence tackled the major challenge of mechanical vulnerability and electrochemical instability, which have never been reported before. Therefore, the developed strategy may offer a powerful and effective alternative for conventional approach of occurring dendrites post-treatments for higher ionic conductivity .
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PubMed
高影响因子
CARBON
·
2021
·
IF 9.594
Yin Zhang,Boya Wang,Peng Jing,Yi Guo,Yueying Zhang,Yunhong Wei,Qian Wang,Yun Zhang,Hao Wu
Introducing a freestanding functional interlayer has been a conventional tactic to immobilize the soluble polysulfide intermediate in Li–S batteries . However, most of the designed interlayers possess extra heavy weight, casting additional technical challenges toward practical high-specific-energy batteries. Herein, an ultralight self-standing interlayer with an extremely low mass loading (∼0.14 mg cm −2 ), composed of porous curly carbon fibers derived from natural biomass with inlaid cobalt electrocatalysts (CF–Co), was engineered via a convenient way. After replacing the poor conductivity sulfur (∼10 −28 S m −1 ) by higher conductivity selenium disulfide (SeS 2 , ∼10 −6 S m −1 ) as active cathode materials , the hierarchically porous-structured, conductive CF-Co interlayer with outstanding adsorptive and electrocatalytic effects is introduced into the resulted Li–SeS 2 batteries to capture dual-intermediate polysulfides/polyselenides, boost their conversion kinetics, and ensure favorable running of Li–SeS 2 cells with high SeS 2 loading and lean electrolyte. Consequently, the coin cells deliver outstanding high-rate capability (404 mAh g −1 at 8 A g −1 ) and superior cycling stability (∼81.5% areal capacity retention in 125 cycles) under high SeS 2 loading (5.0 mg cm −2 ). Significantly, practical high-areal-capacity (>5.5 mAh cm −2 ) Li–SeS 2 pouch cells can be realized by assembling this interlayer with double-side SeS 2 -loading cathodes (132 mg), working stably at relatively lower electrolyte condition (6.0 μL mg −1 ).
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高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xing-Wen Huang,Song-Yi Liao,Yi-Dong Liu,Qiu-Shi Rao,Xiao-Kang Peng,Yong-Gang Min
A novel PEO/CMC-Li @PI hybrid solid polymer electrolyte membrane was designed/assembled by utilizing the polyethylene oxide (PEO) as matrix, the modified N-carboxymethyl chitosan (CMC-Li) as the facilitator to accelerate the transport of lithium ions and the as-prepared polyimide (PI) non-woven fabric as supporting framework. The CMC-Li was firstly synthesized and then combined with PEO and PI non-woven fabric to assemble PEO/CMC-Li@PI membrane using in all solid-state battery (ASSB). The microscopic morphology of the PEO/CMC-Li@PI hybrid membrane was characterized by SEM images. The membranes thermodynamic behaviors were analyzed by the DSC/TG curves, showing that the T m of the PEO/CMC-Li@PI decreased to 46.8 °C. When assembled into all-solid-state battery, the PEO/CMC-Li@PI membrane demonstrated the high ionic conductivities of 3.16 × 10–5 S/cm (30 °C) and 3.15 × 10–4 S/cm (60 °C) calculated from EIS spectra. The electrochemical window of the PEO/CMC-Li@PI cell was measured up to ~5 V at 60 °C. Moreover, the cell with PEO/CMC-Li@PI also delivered excellent electrochemical performances by comparing with other membranes. The high discharge capacities and cycling stability in PEO/CMC-Li@PI cell were assigned to the enhanced ionic conductivity by the added CMC-Li derivative and the improved mechanical properties by the PI non-woven fabric skeleton. The fabrication strategy of the novel PEO/CMC-Li@PI membrane may provide some new design directions for the solid polymer electrolytes in all-solid-state battery.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 24
·2101181
·
IF 18.808
Yifei Shen,Xiaohui Shen,Mei Yang,Jiangfeng Qian,Yuliang Cao,Hanxi Yang,Yang Luo,Xinping Ai
Chemical prelithiation is an effective approach to elevate the initial Coulombic efficiency (ICE) and energy utilization of Li-ion battery electrodes. However, this approach fails to operate for the most commonly used graphite (Gr) anode, because all the prelithiation reagents reported so far have a much higher redox potential than Gr (≈0.2 V). Based on ionic solvation and coordination chemistry, for the first time, a new design strategy is proposed for prelithiation solution by selecting a strong electron-donating, sterically hindered, and chemically stable solvent to tune the redox potential of prelithiation reagent and also to prevent the solvent co-intercalation during prelithiation process, thus enabling a successful prelithiation of Gr anodes. By theoretical prediction and experimental evaluation, a chemical prelithiation solution, lithium biphenylide/2-methyl tetrahydrofuran, is successfully developed, which can prelithiate Gr anodes accurately to a desired state in few minutes without destroying the lattice structure of Gr. When the prelithiated Gr anodes (pGr) are paired with the conventional cathodes, the full cells demonstrate significantly improved ICEs and higher energy densities than their counterparts using pristine Gr anodes, showing a great prospect for wide Li-ion battery applications.
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高影响因子
ACS Applied Energy Materials
·
2020
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IF 4.473
Yanhong Yin,Wanli Zhao,Aili Wang,Hongyun Yue,Zhaoxia Cao,Zhenpu Shi,Shaoyu Li,Shuting Yang
Lithium–sulfur (Li-S) batteries are deemed to be one of the most promising energy storage devices due to their abundant material sources and high energy density. However, the uncontrollable growth of Li dendrites and the shuttle effect severely deteriorate the cycling performances, and consequently, hamper their practical application. In this research, a cation-selective dual-functional separator was designed by coating a thin layer containing sulfonated polyether ether ketone (SPEEK) polymer and Super P (SP) particles on a commercial polyethylene (PE) separator. Here, SPEEK can offer lithium-ion transport channels and inhibit polysulfide anions through a Coulomb action. SP with excellent electronic conductivity and a relatively large specific surface area can achieve physical adsorption to polysulfide anions and can act as an additional collector to promote electron transport, so as to achieve better electrochemical exploitation of sulfur and ensure the reactivation of captured active substances. The composite separators can adjust the deposition of Li to a certain extent, therefore achieving uniform lithium-ion flux and lithium-ion deposition. As expected, the SP/SPEEK-coated separator batteries show an outstanding Coulomb efficiency of 99% and a superior capacity of 950.7 mA h g–1, and the capacity retention rate was 77.5% after 500 cycles at 0.5 C. This work provides an effective strategy to suppress the shuttle effect in Li–S batteries.
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高影响因子
危险品化学品经营许可证（带存储）