Small
·
2018
·Vol. 14
·期 34
·1801798
·
IF 9.598
Xiaohong Zou,Qian Lu,Yijun Zhong,Kaiming Liao,Wei Zhou,Zongping Shao
Gel-polymer electrolytes are considered as a promising candidate for replacing the liquid electrolytes to address the safety concerns in Li–O 2 /air batteries. In this work, by taking advantage of the hydrogen bond between thermoplastic polyurethane and aerogel SiO 2 in gel polymer, a highly crosslinked quasi-solid electrolyte (FST-GPE) with multifeatures of high ionic conductivity, high mechanical flexibility, favorable flame resistance, and excellent Li dendrite impermeability is developed. The resulting gel-polymer Li–O 2 /air batteries possess high reaction kinetics and stabilities due to the unique electrode–electrolyte interface and fast O 2 diffusion in cathode, which can achieve up to 250 discharge–charge cycles (over 1000 h) in oxygen gas. Under ambient air atmosphere, excellent performances are observed for coin-type cells over 20 days and for prototype cells working under extreme bending conditions. Moreover, the FST-GPE electrolyte also exhibits durability to protect against fire, dendritic Li, and H 2 O attack, demonstrating great potential for the design of practical Li–O 2 /air batteries.
研究领域:
电化学能源
·
材料科学
·
纳米复合材料
·
先进电池技术
·
固态离子学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Xueting Yang,Haoyu Deng,Jie Xu,Dezhan Ye,Xiancai Jiang,Yazhou Chen,Ke Sun,Zengjin Liu
1,3-dioxolane (DOL) shows low interfacial impedance and high Coulombic efficiency, thus its polymer electrolytes have attracted extensive attention. In order to initiate DOL polymerization, catalyst amount of LiPF 6 is usually used rather than as the main lithium salt . Totally replacement of LiTFSI with low cost of LiPF 6 could bring the heat explosion and high viscosity when mixing DOL with 0.9 M LiPF 6 electrolyte (carbonate ester solvent). Here, based on the Lewis acid-base interaction, a new type of Lewis base, pyridine, is added to control the explosive polymerization of 1,3-dioxolane in LiPF 6 electrolyte. Through tuning the pyridine content, the gelling process and electrochemical properties could be controlled. It is demonstrated that the optimized monomer conversion and electrochemical window are up to 85.2 % and 4.6 V; meanwhile, the optimized conductivity and transfer number are 0.99 × 10 −3 S/cm (25 °C) and 0.68, respectively. The stable interface between PDOL and lithium metal anode could be proved by the stable over-potential (50mv, 700 h) at current density of 0.5 mA cm −2 . After 500 cycles at 2C, the assembled Li/PDOL@py 0.125 /LiFePO 4 battery delivers 115 mAh/g and 90 % capacity retention, with high average Coulombic efficiency of 99.83 %. The present results demonstrate the heat suppression role of pyridine toward mixing DOL with 0.9 M LiPF 6 electrolyte, which solves the heat and viscosity problems for PDOL based gelling polymer electrolytes .
研究领域:
电化学
·
高分子化学
·
能源材料
·
锂离子电池
·
界面化学
·
功能材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Shi Wang,Qingyuan Li,Minglei Bai,Jixin He,Chongyang Liu,Zengxi Li,Xiangfeng Liu,Wen-yong Lai,Liaoyun Zhang
Lithium-ion batteries (LIBs) using solid-state electrolytes (SSEs) can improve safety and energy density comparable with the liquid electrolytes (LE)-based counterparts. Especially, employing garnet-type SSEs to prepare solid-state LIBs are promising to achieve high-energy cells. However, the unbending and brittle issues of the inorganic SSE films are not suitable to fabricate flexible and stretchable energy storage devices. Here, We find that introducing specific polymer (30 wt%) into Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 (LLZTO) can strongly increase the strength of the composite polymer-in-inorganic electrolyte (CIE) film. Both in-situ and ex-situ characterizations demonstrate that CIE delivers an excellent ability to suppress the growth of Li dendrites due to the close packing of LLZTO and effective filled grain boundaries and voids inside the CIE film by the polymer. The CIE inherits impressive electrochemical performance from LLZTO. As a result, the assembled LiFePO 4 (LFP)/CIE/Li cell delivers better cell performance than LFP/LE-separator/Li cell at ambient temperature (AT). The assembled high-voltage cathode (Li 1.2 Mn 0.6 Ni 0.2 O 2 , 4.8 V)/CIE/Li cell also displays an excellent cell performance at AT. The present study offers new insights into exploring of flexible polymer-in-ceramic electrolytes for high-voltage LIBs with improved safety and energy density .
研究领域:
材料科学
·
电化学
·
能源存储
·
固态电池
·
纳米复合材料
·
界面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jianling Huang,ChengWei Liao,Hui Wang,YuJun Zhao,Liuzhang Ouyang,Jiangwen Liu,Min Zhu
Mg-based alloy anodes suffer from severe corrosion in conventional electrolytes (KOH solution) and this substantially obstructs the cycle life, which is a great challenge for using them in the Ni-MH battery. Herein, a high concentration tetramethylammonium hydroxide (TMAH) aqueous electrolyte with a special hydrate structure is explored and enables excellent cycle stability and high capacity for Mg-based alloy anodes. In this electrolyte, the Mg 0.4 Ti 0.1 Ni 0.5 alloy anode delivers a maximum discharge capacity of 466 mAh g −1 , and maintains 210 mAh g −1 after 100 cycles owing to the reduced corrosion rate , which are much better than that in 6 M KOH electrolyte, being 425 mAh g −1 and 69 mAh g −1 , respectively. Furthermore, by in-situ forming Cu coating on the Mg 0.4 Ti 0.1 Ni 0.5 electrode surface during charging process with the adding 0.01 M of Cu(OH) 2 in TMAH electrolyte, the corrosion of the electrode is further suppressed and the reversible capacity can reach 313 mAh g −1 after 100 cycles. The high conducting Cu coating can also increase the rate capability of the electrode by promoting the charge transfer. Thus, using TMAH electrolytes provides a new approach to promote the electrochemical performances of Ni-MH batteries with Mg-based alloy anodes.
研究领域:
材料科学
·
电化学
·
能源存储
·
金属腐蚀与防护
·
功能材料
·
电池技术
✓ 已验证
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Jingyi Wu,Xiongwei Li,Zhixiang Rao,Xiaoning Xu,Zexiao Cheng,Yaqi Liao,Lixia Yuan,Xiaolin Xie,Zhen Li,Yunhui Huang
Lithium metal is a promising anode material for rechargeable batteries with high energy density . However, the uncontrollable dendrite growth severely hinders the commercialization of Li metal anode . Inspired by the “leveling” mechanism in traditional electroplating, we demonstrate that boron nitride nanosheets (BNNSs) as a liquid electrolyte additive can level out Li protrusions and enable dendrite-free Li metal anodes. 2D BNNSs can automatically and continuously flatten Li deposits and accommodate volume changes during Li plating/stripping. B atoms in BNNS as Lewis acid sites interact with Lewis basic anions in electrolyte, reducing Li + concentration gradient and unifying Li deposition. The collect effects of BNNS additive give rise to dendrite-free Li anodes over 400 h and deep plating/stripping up to 35 mAh cm −2 , as well as potential application in sub-zero temperature batteries (−20 °C). Li–S full cells using BNNS electrolyte also exhibit improved performance. This simple and effective strategy is applicable to develop dendrite-free Li or other metal anodes in high-performance energy storage devices.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Pengfei Zhou,Jing Zhang,Zhennan Che,Zuhao Quan,Ju Duan,Xiaozhong Wu,Junying Weng,Jinping Zhao,Jin Zhou
P2-Na 0.67 Ni 0.33 Mn 0.67 O 2 is considered as a promising cathode material for sodium-ion battery (SIBs) because of its high capacity and discharge potential. However, its practical use is limited by Na + /vacancy ordering and P2-O2 phase transition. Herein, a Ti 4+ /F − co-doping strategy is developed to address these issues. The optimal P2-Na 0.67 Ni 0.33 Mn 0.37 Ti 0.3 O 1.9 F 0.1 exhibits much enhanced sodium storage performance in the high voltage range of 2.0–4.4 V, including a cycling stability of 77.2% over 300 cycles at a rate of 2 C and a high-rate capability of 87.7 mAh g −1 at 6 C. Moreover, the P2-Na 0.67 Ni 0.33 Mn 0.37 Ti 0.3 O 1.9 F 0.1 delivers reversible capacities of 82.7 and 128.1 mAh g −1 at −10 and 50 °C at a rate of 2 C, respectively. The capacity retentions over 200 cycles at −10 °C is 94.2%, implying more opportunity for practical application. In-situ X-ray diffraction analysis reveals that both P2-O2 phase transitions and Na + /vacancy ordering is suppressed by Ti 4+ /F − co-doping, which resulting in fast Na + diffusion and stable phase structure. The hard carbon//P2-Na 0.67 Ni 0.33 Mn 0.37 Ti 0.3 O 1.9 F 0.1 full cell exhibits a high energy density of 310.2 Wh kg −1 and remarkable cyclability with 82.1% retention after 300 cycles at 1 C in the voltage range of 1.5–4.2 V. These results demonstrate that the co-doping Ti 4+ /F − is a promising strategy to improve the electrochemical properties of P2-Na 0.67 Ni 0.33 Mn 0.67 O 2 , providing a facile tactic to develop high performance cathode materials for SIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
·
电池技术
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 32
·2401539
·
IF 8
Qianjin Wang,Zhilin Xiang,Peizhi Yang,Yingkai Liu,Qiuhong Tan
Metal halide perovskites recently have emerged as a promising candidate for photodetection due to their exceptional photoelectric performance. However, the high dark current in these materials has hindered their practical application to imaging. In this study, a novel halogen-mixed CsPbIBr 2 microwire photodetector that has a remarkable reduction of dark current by over 100-fold (compared to CsPbBr 3 ), along with a substantial increase in photocurrent, which yields a significantly improved on/off ratio of 6.56 × 10 4 , is developed. More importantly, the halogen-mixed perovskite photodetector exhibits enhanced photodetection performance, including a high responsivity of 133 A W −1 and a remarkable specific detectivity of 4.02 × 10 12 Jones even under ultraweak light conditions as low as 4.5 nW cm −2 . More specifically, high-resolution images are successfully obtained under ultraweak light conditions. The combined analysis of experimental results and first-principles calculation attribute the excellent performance of the CsPbIBr₂ microwire photodetector to a significant reduction in dark current by suppressing ion migration and increasing carrier effective mass, and a remarkable increase in photocurrent resulting from reduced bandgap and enhanced light absorption, as compared to CsPbBr 3 . This research represents a significant advancement in the development of high-performance 1D perovskite-based photodetectors, with promising implications for ultra-weak light imaging applications.
研究领域:
光电子学
·
材料科学
·
纳米器件
·
半导体物理
·
生物医学成像
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 46
·23773-23779
·
IF 9.931
Zhiyuan Wang,Ruqin Zhang,Min Zhao,Zhongqiang Wang,Bingwei Wei,Xuefeng Zhang,Shuai Feng,Hailiang Cao,Peizhi Liu,Yuying Hao,Hua Wang,Bingshe Xu,Stephen J. Pennycook,Junjie Guo
High-performance organic photovoltaics (OPVs) are of great scientific and technological importance due to their potential large-scale industrial applications. Introducing semiconductor quantum dots has been proven to be an effective way to improve the power conversion efficiency (PCE) of OPVs. In this paper, we report a novel approach to fabricate atomically thin antimonene quantum sheets (AMQSs) possessing a uniform size (≈2.2 nm) via imidazolium ionic liquid-assisted exfoliation. In this method, the yield of AMQSs (1.1 mg mL−1) has been increased by nearly two orders of magnitude compared with that of previously reported methods. Furthermore, upon adding AMQSs into the light absorber in OPVs, the optimal device with 1.0 mg mL−1 AMQSs shows the highest PCE of 9.75%, resulting in over 25% enhancement in PCE compared to that of the reference device. It also leads to a noticeable enhancement in the short-circuit current density (Jsc) of 16.7% and the fill factor (FF) of 8.4%. The increased PCE is mainly due to the two-dimensional electronic structure of AMQSs that can enhance the light absorption, assist exciton dissociation and reduce charge recombination of OPVs. This work provides a new avenue toward mass production of two-dimensional quantum sheets and points to a new strategy for highly efficient OPVs.
研究领域:
材料科学
·
纳米科技
·
光伏技术
·
半导体物理
·
能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xin-yu Hu,Mao-xiang Jing,Hua Yang,Quan-yao Liu,Fei Chen,Wei-yong Yuan,Le Kang,Dong-hong Li,Xiang-qian Shen
Poor room-temperature ionic conductivity and lithium dendrite formation are the main issues of solid electrolytes. In this work, rod-shaped alumina incorporation and graphite coating were simultaneously applied to poly (propylene carbonate) (PPC)-based polymer solid electrolytes (Wang et al., 2018). The obtained alumina modified solid electrolyte membrane (Al-SE) achieves a high ionic conductivity of 3.48 × 10 −4 S/cm at room temperature with a wide electrochemical window of 4.6 V. The assembled NCM622/Al-SE/Li solid-state battery exhibits initial discharge capacities of 198.2 mAh/g and 177.5 mAh/g at the current density of 0.1 C and 0.5 C, with the remaining capacities of 165.8 mAh/g and 161.3 mAh/g after 100 cycles respectively. The rod-shaped structure of Al 2 O 3 provides fast transport channels for lithium ions and its Lewis acidity promotes the dissociation of lithium salts and release of free lithium ions. The lithiophilic Al 2 O 3 and Graphite form intimate contact with metallic Li and create fast Li + conductive layers of Li-Al-O layer and LiC 6 layer, thus facilitating the uniform deposition of Li and inhibiting Li dendrite formation during long-term cycling. This kind of composite Al-SE is expected to provide a promising alternative for practical application in solid electrolytes.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态离子学
·
纳米复合材料
·
锂金属电池
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Chengyu Mo,Yutao Yang,Zhenyu Wang,Yanpeng Lv,Rongzheng Tian,Zixiang Zhao,Hongzhou Zhang,Chunliang Li,Lianqi Zhang,Yongan Yang,Dawei Song
Sulfide solid electrolytes have attracted wide attention due to their high ionic conductivity . Li 6 PS 5 Cl is one of the most promising electrolytes for all-solid-state lithium batteries with high-energy-density. It is reported that the disordered arrangement of Cl - in the aragonite structure has a significant effect on the conductivity of Li 6 PS 5 Cl. In this work, the disorder of anion sites is modestly regulated by adjusting the ratio of S and Cl in Li 6−x PS 5−x Cl 1+x electrolyte. In addition, to verify the commonality of this strategy, Li 5.6 PS 4.6 Cl 1.4 is prepared using self-made Li 2 S, and similar results are obtained. On this basis, the density of Li 5.6 PS 4.6 Cl 1.4 electrolyte sheet is improved by hot-pressing, which can successfully inhibit the growth of lithium dendrites . As expected, the ionic conductivity of the sulfide electrolyte and the electrochemical performance of the ASSLBs are greatly improved. A highest ionic conductivity of 8.2 × 10 −3 S cm −1 of Li 5.6 PS 4.6 Cl 1.4 is obtained at room temperature. A high capacity retention of 99.99 % is maintained for NCM811 @Li 2 O//Li 5.6 PS 4.6 Cl 1.4 //Li-In system after 400 cycles at 1 C with ultra-high cathode loading of 35.6 mg cm −2 . Besides, the cost of sulfide electrolytes can be reduced as the decreased usage of Li 2 S. This work proposes a novel synthesis method of low-cost and high-performance Li 6−x PS 5−x Cl 1+x electrolytes.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态离子学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Xiaowei Kong,Xiaoliang Zhou,Yu Tian,Xiaoyan Wu,Jun Zhang,Wei Zuo,Xiaobo Gong,Zhanhu Guo
A novel La 0.9 Ca 0.1 Fe 0.9 Nb 0.1 O 3-δ (LCFNb) perovskite for solid oxide fuel cells (SOFCs) anode is prepared by means of the citrate-nitrate route and composited with Ce 0.8 Sm 0.2 O 1.9 (SDC) by impregnation method to form nano-scaled LCFNb/SDC anode catalytic layers. The single cells with LCFNb and LCFNb/SDC impregnated anodes both achieve relatively high power output with maximum power densities (MPDs) reaching up to 610, 823 mW·cm −2 in H 2 at 800 °C, respectively, presenting a high potential of LCFNb for use as SOFCs anode. The power outputs of the single cells with LCFNb/SDC composite anode in CO and syngas (CO H 2 mixture) are almost identical to that in H 2 at each testing temperature. This composite anode also presents excellent durability in both H 2 and CO for as long as 50 h, showing desirable anti-reduction and carbon deposition resistance abilities. Besides, the cell output is stable in 100 ppm H 2 S H 2 atmospheres for 20 h at a current density of 600 mA·cm −2 with negligible sulfur accumulation on the anode surface . Hence, a novel iron based perovskite LCFNb anode with remarkable cell performance, carbon deposition resistance and sulfur poisoning tolerance for SOFCs is successfully obtained.
研究领域:
材料科学
·
电化学
·
能源材料
·
无机非金属材料
·
功能陶瓷
·
清洁能源技术
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2021
·
IF 4.889
You Liu,Fang Liu,Jungan Wang,Hongyan Huang,Suhao Yan,Song Gao,Lin Wang,Wei Huang,Tianshi Qin
Wide-bandgap photovoltaics (WBPV) could not only provide electrical energy by photoelectronic conversion of the invisible part of the solar spectrum, but also usually had the unique advantage of high open circuit voltage ( V oc). In this work, we reported a novel HTM based on tetrakis (N-phenothiazine) Spirobifluorene (Spiro-PT), its HOMO energy level could be well matched with MAPbBr 3 perovskite HOMO energy level. This HTM could effectively suppress nonradiative recombination, which leads to an increase in the photovoltage of WBPV to more than 1.41 V. As a result, the n-i-p mesoscopic structured WBPV achieved a champion PCE of 7.36% as well as excellent operational stability exhibiting 91% of initial efficiency after 500 h continuous illumination without encapsulation. Based on the high V oc of the MAPbBr 3 /Spiro-PT device, the photovoltaic electrochromic device showed a response speed (the average coloring time was 40 s and the bleaching time was 272 s) and high average visible light transmittance contrast (about 37% in 450–780 nm), the corresponding electrochromic device with maximum dynamic contrast up to 46% at 600 nm between bleached and colored states. This WBPV-powered electrochromic system could provide a pathway towards stand-alone smart window technique for future energy-saving buildings.
研究领域:
材料科学
·
光伏技术
·
纳米能源
·
智能窗技术
·
器件物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）