QIBEBT-IR研究单元&专题: 先进界面技术研究组http://ir.qibebt.ac.cn:80/handle/337004/14742024-03-29T04:46:38Z2024-03-29T04:46:38Z高性能聚阴离子型正极材料——LiMPO4 (M=Co, Mn, Fe)的研究董林涛http://ir.qibebt.ac.cn:80/handle/337004/136582019-12-31T10:57:04Z2019-12-31T10:57:04Z题名: 高性能聚阴离子型正极材料——LiMPO4 (M=Co, Mn, Fe)的研究
作者: 董林涛2019-12-31T10:57:04Z无机固态电解质材料及其制备方法金永成马福瑞赵二庆孙德业http://ir.qibebt.ac.cn:80/handle/337004/135582019-12-31T10:39:23Z2019-12-31T10:39:21Z题名: 无机固态电解质材料及其制备方法
作者: 金永成; 马福瑞; 赵二庆; 孙德业2019-12-31T10:39:21Z锂硫电池用高性能隔膜的制备与性能研究王延青http://ir.qibebt.ac.cn:80/handle/337004/134752018-12-29T22:02:28Z2018-12-29T09:33:21Z题名: 锂硫电池用高性能隔膜的制备与性能研究
作者: 王延青2018-12-29T09:33:21Z锂离子电池用固体电解质的制备及其性能研究马福瑞http://ir.qibebt.ac.cn:80/handle/337004/134742018-12-29T22:02:29Z2018-12-29T09:33:20Z题名: 锂离子电池用固体电解质的制备及其性能研究
作者: 马福瑞2018-12-29T09:33:20ZEnhanced Rate Performance of Al-Doped Li-Rich Layered Cathode Material via Nucleation and Post-solvothermal MethodYang, WenchaoXie, YuJiang, JichengSun, DeyeMa, XiaodiLan, ZhenggangJin, Yongchenghttp://ir.qibebt.ac.cn:80/handle/337004/108202019-12-31T08:34:42Z2018-09-06T06:59:51Z题名: Enhanced Rate Performance of Al-Doped Li-Rich Layered Cathode Material via Nucleation and Post-solvothermal Method
作者: Yang, Wenchao; Xie, Yu; Jiang, Jicheng; Sun, Deye; Ma, Xiaodi; Lan, Zhenggang; Jin, Yongcheng
摘要: Al-doped layered cathode materials Li1.5-xAlxMn0.675Ni0.1675Co0.1675O2 have been successfully synthesized via a rapid nucleation and post-solvothermal method. The surface morphology and crystal structures of Al-doped Li-rich materials are investigated via scanning electron microscopy, X-ray diffraction, Raman spectra, and X-ray photoelectron spectroscopy. After optimization, the Li1.45Al0.05Mn0.675Ni0.1675Co0.1675O2 (Al = 0.05) sample showed excellent electrochemical performance, and the discharge capacities are 323.7 and 120 mAh g(-1) at a rate of 0.1 and 20 C,respectively. These improvements, based on electrochemical performance evaluation and density functional theory calculations, might be ascribed to the increased electron conductivity of layered Li-rich material via Al3+ ions doped into a crystal structure.2018-09-06T06:59:51ZA multifunctional graphene oxide-Zn(II)-triazole complex for improved performance of lithium-sulfur battery at low temperatureZhang, ZengqiWang, YanqingLiu, JianSun, DeyeMa, XiaodiJin, YongchengCui, Yongjiehttp://ir.qibebt.ac.cn:80/handle/337004/107622019-12-31T08:34:36Z2018-09-06T06:59:27Z题名: A multifunctional graphene oxide-Zn(II)-triazole complex for improved performance of lithium-sulfur battery at low temperature
作者: Zhang, Zengqi; Wang, Yanqing; Liu, Jian; Sun, Deye; Ma, Xiaodi; Jin, Yongcheng; Cui, Yongjie
摘要: Although performance of Li-S batteries with various carbon/sulfur composites has been wildly explored at room temperature, the reports studying the behaviors of Li-S cathodes at low temperature are few. Herein, a novel multifunctional graphene oxide-Zn(II)-triazole complex (denoted as GO-Zn(II)-AmTZ) with excellent property at low temperature(-20 degrees C) is successfully prepared. In GO-Zn(II)-AmTZ, the metal ions (Zn(II)), amine groups and the N penta-heterocycle are introduced synchronously, leading improvement of Li-S performance at both room and low temperature. As a result of the multifunctional arrangement, GO-Zn(II)-AmTZ cathodes could provide a discharge capacity of 315 mAh g(-1) (0.5C) after 100 cycles at -20 degrees C. A capacity of similar to 520 mAh g(-1) is achieved over 300 cycles at room temperature with low capacity attenuation rate at current rate of 0.5C. The improved performance is speculated to the contribution of enhanced polysulfide immobilization of GO-Zn(II)-AmTZ modified by the Zn(II), amine groups and the N atoms. (C) 2018 Elsevier Ltd. All rights reserved.2018-09-06T06:59:27ZLiNi0.6Co0.2Mn0.2O2正极材料的制备及性能研究姜继成http://ir.qibebt.ac.cn:80/handle/337004/99872018-08-27T22:57:09Z2018-01-08T10:34:39Z题名: LiNi0.6Co0.2Mn0.2O2正极材料的制备及性能研究
作者: 姜继成2018-01-08T10:34:39Z高性能富锂层状正极材料的制备与研究颜文超http://ir.qibebt.ac.cn:80/handle/337004/99662018-08-27T22:57:41Z2018-01-08T10:03:14Z题名: 高性能富锂层状正极材料的制备与研究
作者: 颜文超2018-01-08T10:03:14Z高性能二次锂硫电池正极材料的研究朱绍银http://ir.qibebt.ac.cn:80/handle/337004/98082018-08-27T23:02:39Z2017-12-29T15:13:16Z题名: 高性能二次锂硫电池正极材料的研究
作者: 朱绍银
摘要: The cells performance of second lithium-sulfur batteries was determined by the cathode properties to a large extent. Therefore, it is necessary to improve the electrochemical performance of cathode materials for lithium-sulfur batteries. Herein, we mainly try to improve the electrochemical properties of cathode materials through the reasonable design and modification of cathodes components (such as carbon materials, binder), and try to establish the structure-function relationship between structure modification and electrochemical properties. Solutions presented in this article are summarized as follows:
1. An activated carbon with enriched amine groups was prepared by carbonizing the polyimide wastes. The prepared cathodes basing on the carbon/sulfur composites have an excellent electrochemical performance at low temperature. Under the condition of -20 °C, the specific capacity of 368 mAh g-1 (0.5 C) was achieved after 100 cycles. At the room temperature (25 °C), the as-prepared cathodes show the retained specific capacity of 620 mAh g-1 (0.5 C) after 350 cycles with a low capacity-decay rate (0.071% per cycle). The excellent electrochemical performance at low temperature and room temperature is mainly attributed to the enriched amine groups with good chemical adsorption to polysulfides.
2. In order to decrease the crystallization properties inside polymers as gel hosts of polymer gel electrolyte, a small molecule gel with flexible design and no crystallization was synthesized to prepare small molecule gel electrolyte (sGE). The primary possibility as electrolyte materials in lithium-sulfur batteries was explored. The prepared small molecule gel electrolyte shows an ionic conductivity of 6.43×10 -3 Scm-1 at room temperature. The prepared cathode with this small molecule gel electrolyte shows a discharge capacity of 1008 mAh g-1 (0.1 C) in primary cells.
摘要: 锂硫电池正极材料的性能在很大程度上决定着二次锂硫电池的电池性能,因此研究如何提高锂硫电池正极材料的电化学性能具有重要的科学意义和应用价值。本论文主要通过对正极材料各组分(如碳材料、粘结剂)的合理设计及改性来提高正极材料整体的电化学性能,并建立材料的结构改性与电化学性能之间的构效关系。
本文的主要结论:
1. 以聚酰亚胺废料为原料制备了一种富含胺基的活性炭材料,用其制备的碳硫复合材料作为锂硫电池正极具有优异的低温电化学性能。在-20℃条件下,循环100圈之后仍保持368 mAh g-1(0.5C)的容量。室温25℃条件下,制备的硫正极表现出良好的循环可逆性,循环350圈之后能保有620 mAh g-1(0.5C)的容量,每一圈的容量衰减为0.071%。该正极优异的低温和常温电化学性能主要归因于材料表面丰富的胺基对聚硫阴离子起到了良好的化学吸附作用。
2. 为了消除聚合物凝胶电解质中聚合物自身的结晶特性,我们制备了一种小分子凝胶电解质材料,初步探索了有机小分子凝胶作为锂硫电池电解质材料的可能性。制备的小分子凝胶电解质在常温下具有6.43×10-3 S cm-1的离子电导率,用其制备的一次锂硫电池正极的放电容量也有1008 mAh g-1(0.1 C)。2017-12-29T15:13:16Z全固态电池材料的制备及性能研究赵二庆http://ir.qibebt.ac.cn:80/handle/337004/98072018-08-27T23:02:41Z2017-12-29T15:13:15Z题名: 全固态电池材料的制备及性能研究
作者: 赵二庆
摘要: Solid state electrolyte is one of key components for all solid state lithium ion batteries, which greatly determines the power density, cycle stability, safety performance, high and low temperature performance and the life of batteries. Herein, to improve the electrochemical performance and stability of solid state electrolyte, the preparation process for electrolyte materials and electrolytes was optimized. Moreover, the optimum process was identified. Meantime, in order to reduce the polarization resistance of intermediate temperature solid oxide fuel cell, the intrinsic properties and microstructure of cathode materials were optimized, and thus the cathode performance was improved.
The main conclusions of this paper can be sumarried as follows:
1. The Li1.3Al0.3Ti1.7(PO4)3 (LATP) electrolyte materials with NASICON structure were prepared via a modified Pechini synthesis method. By optimizing the preparation process parameters, such as dispersant, calcination temperature for electrolyte powders, sintering temperature and period for electrolyte pellets, the high performance LATP electrolyte was obtained with the highest electrical conductivity of 6.0 x 10-4 S/cm at 303 K, which is comparable to those reported in references. The excellent electrochemical performance is due to the high densification of electrolyte with the relative density of 95.76%. Additionally, the electrolyte has a negligible electronic conductivity, whose value is only 1.2 x 10-8 S/cm.
2. In order to inhibit the reaction between LATP electrolyte and Li anode, a Li1.3Al0.3Ge1.7(PO4)3 (LAGP) barrier layer was constructed on the surface of LATP electrolyte substrate to form a LATP/LAGP double-layer electrolyte via a simple and inexpensive dry-pressing technique. A dense and smooth solid state electrolyte with dense structure can be obtained using the LAGP starting materials sintered at 650 °C, which is due to the good sintering match between LAGP layer and LATP substrate. The electrolyte exhibited excellent electrochemical performances and stability. Its electrical conductivity at room temperature is 3.4 x 10-4 S/cm, and the value of electronic conductivity is 9.6 x 10-9 S/cm. When the electrolyte was placed in the air for a long time or contacted with Li metal, its electrochemical properties were not attenuated. The assembled LiFePO4 (LFP) battery showed the first charge and discharge capacities of 142 mAh/g and 130.6 mAh/g. After 3 cycles, the capacities was increased to 145.3 and 141.4 mAh/g.
3. A series of perovskite-type La0.3Sr0.7T1-xCoxO3 (LSCT, x=0.1-0.8) cathode materials for solid oxide fuel cells were synthesized via a convenient modified sol-gel method. By optimizing the content of Co dopant, high perforamce cathode materials were obtained. The LSCT cathode with “x= 0.8” has the best electrochemical performance, achieving the polarization resistances of 1.12, 0.40 and 0.15 Ω cm2 at 550, 600 and 650 °C, and the activation energy of the LSCT cathode was 1.435 eV, which was attributed to the enhancement of the molecular oxygen dissocation and charge transfer process in the cathode.
摘要: 锂离子固态电解质作为全固态电池的关键组件之一,其性能很大程度决定了电池的功率密度、循环稳定性、安全性能、高低温性能以及使用寿命。本文通过合理优化电解质材料及电解质的制备工艺来提高电解质的电化学性能及稳定性,并确立了电解质制备的最佳工艺。同时,针对中低温固体氧化物燃料电池阴极极化电阻大的问题,对阴极材料的特性及微观结构进行了优化,提高了阴极的电化学性能。
本文的主要结论如下:
1. 采用一种改良的Pechini合成方法制备了NASICON结构的Li1.3Al0.3Ti1.7(PO4)3(LATP)电解质材料。通过优化制备工艺参数,如分散剂、粉体的烧结温度、电解质片烧结温度和时间,制备出了高性能LATP电解质。电解质在303 K下的最高电导率为6.0×10-4 S/cm,高于大多数文献报道的结果,其良好的性能归因于电解质致密的结构,其致密度高达95.76%,而且该电解质具有可忽略的电子电导率,其数值仅为1.2 ×10-8 S/cm。
2. 为了抑制LATP电解质与Li负极的反应,通过一种简单廉价的干压技术在LATP电解质基体表面构筑了Li1.3Al0.3Ge1.7(PO4)3(LAGP)阻隔层,形成了LATP/LAGP双层电解质。650 °C合成的LAGP与LATP基体烧结行为匹配,制备的双层电解质表面平整、光滑、结构致密。制备的电解质具有良好的电化学性能及稳定性,室温电导率为3.4×10-4 S/cm,电子电导率数值为9.6×10-9 S/cm,在空气中长时间放置以及与Li金属接触,电化学性能均未衰减。组装了LiFePO4(LFP)电池,在0.1C电流下,电池的首次充放电容量为142.0 mAh/g和130.6 mAh/g,3次循环后,容量分别增至145.3和141.4 mAh/g。
3. 采用一种改良的溶胶凝胶法合成了一系列La0.3Sr0.7T1-xCoxO3 (LSCT, x=0.1-0.8)阴极材料,通过优化Co的掺杂量,获得了高性能的阴极材料,当x=0.8时,阴极在550 °C、600 °C、650 °C下的极化电阻数值分别为1.12、0.40和0.15 Ω cm2,活化能为1.435 eV,良好的电化学性能主要归因于电极内部氧的解离和电荷传输能力的提高。2017-12-29T15:13:15Z