JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Yunfeng Zhang,Jiaying Wang,Chang Tan,Yang He,Yazhou Chen,Shikang Huo,Danli Zeng,Chen Li,Hansong Cheng
Single lithium ion conducting polymer electrolytes (SIPEs) are an emerging class of alternative polymer electrolytes for protecting lithium metal anode . This work explores a fully aromatic sp 3 boron based SIPE, lithium poly (4,4′-dihydroxydiphenyl sulfone borate), Li-PSB, via a one-step synthetic procedure. A series of highly porous SIPE membranes, defined as po -PBSBs, comprising of Li-PSB and a fully aromatic polybenzimidazole (PBI) binder are firstly prepared. As a polymer electrolyte, po -PBSB exhibits high lithium ion transference number of close to unity, high ionic conductivity , excellent thermal dimensional stability and promising flame-retardant. X-ray Photoelectron Spectroscopy (XPS) and Density Functional Theory (DFT) calculations depict multi-coordinated lithium ion transport channels in the po -PBSB membranes. By serving as polymer electrolyte in lithium metal batteries (LMBs), Li/LiFePO 4 (LFP) cell, the po -PBSB shows an effective suppression of lithium dendrite growth. As a consequence, po -PBSB based Li/LFP cell demonstrates superior cycling performance remaining 76.1% of its initial capacity with nearly 100% coulombic efficiency at 1.0C after 200 cycles. The excellent performance may be ascribed to the remarkable lithium ion transference number, high organic solvent absorption in pores and thermal and electrochemical stabilities of the po- PBSB. We believe that the novel SIPE materials have great potential for application in high-safety LMBs.
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JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Huanhuan Wu,Yakai Lin,Wenyan Feng,Tianyin Liu,Lin Wang,Hong Yao,Xiaolin Wang
In order to utilize lithium from brines with high Mg 2+ /Li + ratio, a positively charged nanofiltration (NF) membrane was prepared by grafting amine-functionalized ionic liquid 1-(3-aminopropyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([MimAP][Tf 2 N]) onto the surface of polyamide (PA) membrane. The effects of [MimAP][Tf 2 N] contents on the chemical composition, surface morphology , surface charges and separation properties of the modified PA membranes were discussed. The results of chemical composition analyses indicated reaction of the amine group of [MimAP][Tf 2 N] with the residual acyl chloride groups, which was existed on the surface of the nascent PA membrane. The surfaces of all the modified PA membranes were positively charged at pH = 6.4 due to the quaternary ammonium group of [MimAP][Tf 2 N]. In the separation process, the resulting membrane presented high water permeance (37.8 L/(m 2 ⋅h)) and mono-/divalent cation selectivity (Li + and Mg 2+ ) with much higher MgCl 2 rejection (83.8%) than LiCl rejection (24.4%). For a simulative brine with a Mg 2+ /Li + ratio of 20, the rejections to Mg 2+ and Li + by the optimized membrane (NF-IL-2.0%) were around 81.9% and −45.2%, respectively, where the permeate with the Mg 2+ /Li + ratio of 3.5 was obtained and the selectivity ( S Li,Mg ) was 8.12. Additionally, the optimized membrane exhibited a stable performance for Mg 2+ /Li + separation. Therefore, there is a very possibility for utilization of lithium from brine with high Mg 2+ /Li + ratio by using the optimized NF membrane.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Shizhen Li,Honglei Zhang,Wanru Chen,Yulong Zou,Hangqi Yang,Jingbo Yang,Chuang Peng
Shuttle effect and the low utilization of dissolved lithium polysulfides (LiPSs) are two prevailing concerns in Li-S battery (LSB) research. Energy efficiency on the other hand is often overlooked but vital to the commercial deployment of battery technology. In this work, a composite of hyperbranched poly(amidoamine)-modified multiwalled carbon nanotubes (PAMAM-CNTs) is successfully prepared by chemical grafting and employed as an interlayer material in LSBs. The high content and highly dispersed polar functional groups of PAMAM can efficiently adsorb and enhance the redox reaction of LiPSs. The CNTs function as a scaffold and current collector that reduces the internal polarization. The assembled LSB displays a high energy efficiency of 86% and a low capacity fading rate of 0.037% per cycle over 1200 cycles at 2 C. The cell also shows excellent cycle performance, high sulfur utilization, and improved stability at a high areal capacity of 9 mAh cm–2 (achieved at a sulfur loading of 8.7 mg cm–2) and low electrolyte/sulfur ratio of 6.1 mL g–1. This thin (12 μm) and lightweight (0.34 mg cm–2) interlayer has a negligible impact on the overall cell energy density.
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高影响因子
Small
·
2020
·Vol. 16
·期 13
·1907163
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IF 11.459
Rongxiang Hu,Huayu Qiu,Huanrui Zhang,Peng Wang,Xiaofan Du,Jun Ma,Tianyuan Wu,Chenglong Lu,Xinhong Zhou,Guanglei Cui
Lithium (Li) metal batteries (LMBs) are enjoying a renaissance due to the high energy densities. However, they still suffer from the problem of uncontrollable Li dendrite and pulverization caused by continuous cracking of solid electrolyte interphase (SEI) layers. To address these issues, developing spontaneously built robust polymer-reinforced SEI layers during electrochemical conditioning can be a simple yet effective solution. Herein, a robust homopolymer of cyclic carbonate urethane methacrylate is presented as the polymer matrix through an in situ polymerization method, in which cyclic carbonate units can participate in building a stable polymer-integrated SEI layer during cycling. The as-investigated gel polymer electrolyte (GPE) assembled LiCoO 2 /Li metal batteries exhibit a fantastic cyclability with a capacity retention of 92% after 200 cycles at 0.5 C (1 C = 180 mAh g −1 ), evidently exceeding that of the counterpart using liquid electrolytes. It is noted that the anionic ring-opening polymerization of the cyclic carbonate units on the polymer close to the Li metal anodes enables a mechanically reinforced SEI layer, thus rendering excellent compatibility with Li anodes. The in situ formed polymer-reinforced SEI layers afford a splendid strategy for developing high voltage resistant GPEs compatible with Li metal anodes toward high energy LMBs.
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高影响因子
SOLID STATE IONICS
·
2020
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IF 3.107
Chang Su,Pengju Guo,Lihuan Xu
The Li (tri-(4-carboxyphenyl) amine) (Li-TCPA 2 ) doped polypyrrole (PPy-Li-TCPA 2 ) composites were successfully prepared by in-situ chemical oxidation using pyrrole and Li-TCPA 2 as raw materials. The structure, morphology, electrochemical properties of prepared materials were characterized by fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), specific surface area test (BET), scanning electron microscopy (SEM), cyclic voltammogram (CV) and electrochemical impedance spectra (EIS), respectively. Also, the charge-discharge properties of the prepared composites were studied by galvanostatic charge-discharge testing. The results demonstrated that as-prepared composite material exhibited a reversible redox process at 2.0–4.0 V. And the discharge specific capacity for PPy-Li-TCPA 2 (2:1) and PPy-Li-TCPA 2 (6:1) are 50.4 mAh·g −1 and 63.7 mAh·g −1 as measured at 30 mA·g −1 between 2.0 and 4.0 V, while PPy-Li-TCPA 2 (4:1) exhibited the discharge specific capacity of 91.1 mAh·g −1 , which were remarkably higher than that of the pure PPy (29.5 mAh·g −1 ) under the same experimental conditions. At the same time, PPy-Li-TCPA 2 (4:1) has improved rate performance and stable cycleability. The excellent electrochemical properties are attributed to the introduction of Li-TCPA 2 as dopant , which improved the electrical conductivity and the redox activity of PPy. Furthermore, the resulted well-dispersed particle structure of the composite as well as its improved specific surface area for doped PPy facilitated to the contact of the electrolyte with the active material, leading to the increased utilization ratio of active material and the enhanced electrochemical performances .
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SOLAR ENERGY
·
2020
·
IF 4.608
Yue Qiang,Yahong Xie,Ying Qi,Peng Wei,Haokun Shi,Cong Geng,Haichao Liu
SnO 2 (Tin oxide) is one of the most successful electron transport layer (ETL) materials in perovskite solar cells (PSCs) because of its low sintering temperature and simple preparation process. Similarly, carbon-based hole transport material-free PSCs (C-PSCs) have been widely studied because of their excellent stability and low price. Therefore, C-PSCs having SnO 2 as ETL can be envisaged as a promising PSCs system for commercial flexible equipment. However, studies on this system are still scarce because of its low power conversion efficiency (PCE). In this paper, the electron lifetime and current (J sc ) of a PSC containing a Li-SnO 2 /Al 2 O 3 + CH 3 NH 3 PbI 3 /carbon structure are greatly improved by doping lithium into SnO 2 (Li-SnO 2 ) and sandwiching an Al 2 O 3 interlayer into the Li-SnO 2 ETL and CH 3 NH 3 PbI 3 . A PCE of 10.01% is obtained, which is 42.3% higher than a PSC having a SnO 2 /CH 3 NH 3 PbI 3 /carbon structure. The entire preparation process is very simple and is carried out in an air atmosphere below 200 °C (20–40% humidity).
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APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Wei Luo,Yi Liu,Fan Li,Jinghao Huo,Dan Zhao,Jianfeng Zhu,Shouwu Guo
The novel V 2 CT x MXenes have gained increasing attention as anode materials in lithium-ion batteries, but to boost their practical to the theoretical values is still challenging. Herein, the partially etched V 2 CT x was oxidized in the presence of H 2 O 2 through a hydrothermal reaction and the electrochemical properties of as-obtained oxidized V 2 CT x were assessed. It is illustrated that the oxidized V 2 CT x possesses a large surface interlayer spacing, and enriched with VO 2 (A) and O-terminate groups. Once used as anode materials for Li-ion batteries, the oxidized V 2 CT x shows enhanced specific lithium ion storage capacities of 318 mAh·g −1 at 100 mA·g −1 after 100 cycles, and 125 mAh·g −1 at 1000 mA·g −1 after 1000 cycles, and better cycling stability and excellent rate performance over the V 2 CT x .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Shuai Zou,Gang Wang,Yiming Zhang,Caihong Xue,Huiyuan Chen,Guijun Yang,Hui Nan,Haomin Wei,Hong Lin
Lithium titanate (Li 4 Ti 5 O 12 , LTO) has several disadvantages as active material for Li-ion batteries (LIBs) such as low conductivity and poor capacity. To overcome these drawbacks and specifically to improve electrical performance of LTO, we used solvothermal method to synthesis LTO and to dope it simultaneously with Al and Mn. Doped LTO was then incorporated into composites containing graphene (G), carbon nanotube (CNT) or carbon quantum dots (CQDs) to enhance specific capacity and conductivity of LIB anodes containing these composites as active materials. To have a further study of different carbon materials composite with doped LTO, these materials we obtained were thoroughly characterized. LTO doping and incorporation into composites not only increased its specific capacity and also decreased its impedance. Al 3+ and Mn 4+ substituted Ti 4+ located at 16 d sites. First cycle specific capacity values and impedance values of anodes consisting of composites containing doped LTO and G, CNT or CQDs were 261.7, 286.2 and 296.5 mA h/g (at C/10 rate) and 13.99, 8.28, 18.79 Ω, respectively. Capacity retention after 100 cycles for these anodes was 84.6, 90.67 and 83.4%. LTO doping by Al 3+ and Mn 4+ and combining it with G, CNT or CQDs effectively improved its electrochemical performance. The best performance was obtained for anodes containing composites consisting of a combination of doped LTO and CNT.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 43
·23342-23353
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IF 11.9
Zhihui Ma,Jie Shi,Di Wu,Dishuang Chen,Shuai Shang,Xuanhui Qu,Ping Li
The sulfide-based solid electrolyte (SSE) has been considered as a strong candidate for potential uses in all-solid-state lithium batteries (ASSLBs). Nevertheless, most of the reported SSEs are plagued with their intrinsic air-sensitive behaviors and Li-incompatibility, which largely preclude scalable fabrication and widespread practical application. Herein, we report the Li6+xSb1−xSnxS5I (LSSSI-x) SSEs using nontoxic inexpensive Sn substitution to deal with these issues. The ionic conductivity of Li6+xSb1−xSnxS5I can achieve a maximum value of 3.49 × 10−4 S cm−1 at room temperature when x = 0.4, which is over 40-fold that of the pristine Li6SbS5I. The Li symmetric cell with I-rich Li6.4Sb0.6Sn0.4S5I (LSSSI-0.4) electrolyte delivers a stable Li+ plating/stripping behavior over 450 h at a current density of 0.1 mA cm−2. Benefiting from the decent Li-compatibility of LSSSI-0.4, the assembled ASSLB with LiNi0.8Co0.1Mn0.1O2-based composite cathode and Li-metal anode displays good cycling performance. The LSSSI-0.4 electrolyte also possesses excellent moisture stability. ASSLB using the dried LSSSI-0.4 electrolyte still exhibits a well-maintained initial discharge capacity of 184.0 mA h g−1 at 0.1C and an impressive capacity retention rate of 70.6% after 600 cycles at 0.2C. This work offers a feasible option with superior integrated properties to push forward the advancement of high-performance ASSLBs.
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Kang-Hui Hu,Chao-Qiong Zhu,Bao-Ping Zheng,Lang Qiu,Fang Wan,Yang Song,Ben-He Zhong,Zhen-Guo Wu,Xiao-Dong Guo
Li-rich Mn-based oxide cathodes are one of the most promising cathode candidates for high energy density over 400 Wh kg −1 , deriving from oxygen redox of Li-O-Li configuration. However, the deep oxygen oxidation would lead to the formation of peroxides and superoxides (O 2 n − , 0 < n ≤ 2) and even oxygen (O 2 ), accompanied by crystal phase transformation and structure collapse. Herein, an integrative strategy of simultaneously regulating the right amount of oxygen vacancies (OVs) and B-atom doping is proposed to achieve differentially modification of both R-3 m and C2/m phases. Firstly, Rietveld refinement, HRTEM and in situ XRD results reveal that the linear increase of OVs content is achieved by regulating the amount of BN and the selective introduction of OVs inside the C2/m phase makes the oxygen partial pressure lower in the weak O-Li-O bonds of TM-layer and inhibits oxygen release at over 4.5 V. Meanwhile, kinetics test shows oxygen defects would accelerate the Li + diffusion and reduce the electronic impedance driven by uneven local charge distribution. Secondly, lattice analysis shows the strong covalent B-O bonds located at the tetrahedral site not only prevent the overoxidation of the oxygen atoms at high voltage, but also hinder the migration of Mn atoms through tetrahedral sites, which effectively avoids the damage of the crystal structure. As a result, the modified cathode exhibits the excellent discharge specific capacity of 272 mA h g −1 at 0.1C, higher rate performance of 145 mA h g −1 at 5C, an outstanding capacity retention rate of 93% at 1C and lower voltage decay value of 0.43 V after 200 cycles. This promising strategy could simultaneously achieve both high energy density and superior cycling stability and help to advance industrial application of Li-rich Mn-based Cathodes.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Chaoqun Zhang,Qi He,Wenbin Luo,Jian Du,Yehan Tao,Jie Lu,Yi Cheng,Haisong Wang
The commercial graphene for Li ion batteries (LIBs) has high cost and low capacity. Therefore, it is necessary to develop a novel carbon anode. The cellulose nanowires (CNWs), which has advantages of low cost, high carbon content, is thought as a good carbon precursor. However, direct carbonization of CNWs leads to low surface area and less mesopores due to its easy aggregation. Herein, the metal-organic frameworks (MOFs) have been explored as templates to prepare porous carbon due to their 3D open pore structures. The porous carbon was developed with the coordination effect of CNWs and MOFs. The precursor of MOFs coordinates with the −OH and − COOH groups in the CNWs to provide stable structure. And the MOFs was grown in situ on CNWs to reduce aggregation and provide higher porosity. The results show that the porous carbon has high specific capacity and fast Li + /electronic conductivity. As anode for LIBs, it displays 698 mAh g −1 and the capacity retention is 85 % after 200 cycles. When using in the full-battery system, it exhibits energy density of 480 Wh kg −1 , suggesting good application value. This work provides a low-cost method to synthesize porous carbon with fast Li + /electronic conductivity for high-performance LIBs.
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Advanced Science
·
2023
·
IF 15.1
Quanzhen Sun,Chen Shi,Weihao Xie,Yifan Li,Caixia Zhang,Jionghua Wu,Qiao Zheng,Hui Deng,Shuying Cheng
Ion doping is an effective strategy for achieving high-performance flexible Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells by defect regulations. Here, a Li&Na co-doped strategy is applied to synergistically regulate defects in CZTSSe bulks. The quality absorbers with the uniformly distributed Li and Na elements are obtained using the solution method, where the acetates (LiAc and NaAc) are as additives. The concentration of the harmful Cu Zn anti-site defects is decreased by 8.13% after Li incorporation, and that of the benign Na Zn defects is increased by 36.91% after Na incorporation. Synergistic Li&Na co-doping enhances the carrier concentration and reduces the interfacial defects concentration by one order of magnitude. As a result, the flexible CZTSSe solar cell achieves a power conversion efficiency ( PCE ) of 10.53% with certified 10.12%. Because of the high PCE and the homogeneous property, the Li&Na co-doped device is fabricated to a large area (2.38 cm 2 ) and obtains 9.41% PCE . The co-doping investigation to synergistically regulate defects provides a new perspective for efficient flexible CZTSSe solar cells.
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