聚乙炔的固体电解质Lil电池及其性能

Li/LiI/[CH(I_3)Y]_x电池利用快离子导体碘化锂作电解质。电池V_(oc)为3.06,其具有装配方便,重量轻的优点。     

正极材料Li(Ni1/3Co1/3Mn1/3)1-xCrxO2的合成与表征

采用草酸盐共沉淀法合成一系列的Li(Ni_1/3Co_1/3Mn_1/3)_1-xCr_xO₂正极材料(0 ≤x ≤0.1),用X射线衍射仪（XRD）和扫描电子显微镜（SEM）分析合成产物的晶体结构及表面形貌;利用充放电仪测定了产物的电化学性能.结果表明,合成的Li(Ni_1/3Co_1/3Mn_1/3)_1-xCr_xO₂( x = 0.01,0.03,0.05,0.07) 均保持α-2NaFeO₂ 层状结构相,属于空间R3m点群.Li(Ni_1/3Co_1/3Mn_1/3)_0.95Cr_0.05O₂的电化学性能最佳,首次放电容量达158.6 mAh/g,在2.5～4.5 V区间30次循环后比容量衰竭率仅为3.92%.Li(Ni_1/3Co_1/3Mn_1/3)_0.95Cr_0.05O₂和Li(Ni_1/3Co_1/3Mn_1/3)CrO₂ 的电极阻抗变化不同,进而影响其电化学性能.     

尖晶石型Li-Mn-O多元素掺杂的高温电化学特性

采用高温固相浸渍法合成了多元复合掺杂尖晶石型锰酸锂Li 1.02MxMn 2-xQyO 4-y正极材料.XRD表征合成的产物均为良好的尖晶石型结构材料;SEM表明所合成的产物颗粒均匀且有良好的粒径分布.以该物质作为锂离子电池的正极材料组装成扣式电池,经充放电循环测试可知:多元素掺杂的尖晶石型锰酸锂正极材料Li 1.02CoaCrbLacMn 2-a-b-cFyO 4-y较富锂尖晶石和单元素Co、Cr掺杂的正极材料能够更好地抑制电池的可逆容量在充放电过程中的衰减,循环性能有了很大改善,表现出很好的电化学可逆特性,80次循环后放电容量仍能保持94.5%以上;特别是高温(55 ℃)性能更加突出,40次循环后放电容量仍能保持102.1mA.h/g(91.5%)以上.作为锂离子电池的正极材料,该复合掺杂材料是众多取代钴酸锂材料中最具竞争力的材料之一,也有望成为锂离子动力电池的正极材料.     

液相法制备锂离子电池负极材料Li4Ti5O12

Li4Ti5O12负极材料因其在充放电过程中"零应变"的优势,得到了广泛关注,成为锂离子电池负极材料的研究热点.采用液相法制备了Li4Ti5O12负极材料.通过正交实验,确定了Li4Ti5O12的最佳制备工艺条件:烧结温度为750℃;烧结时间为8 h;LiOH.H2O为锂源;原料中锂钛的物质的量比为0.85.该条件下制备的材料具有较好的电化学性能,首次放电比容量可达到191.61 mAh/g.     

氧化镍钴锂(LiNi0.8Co0.2O2)为正极的高比能量18650型锂离子电池研究

对高比容量、低成本的氧化镍钴锂材料的合成及其在18650型锂离子电池中的性能进行了研究,合成出的批量5kg的氧化镍钴锂材料的放电比容量达到180mAh/g以上．以其为正极,MCMB和天然石墨为负极组装的一批18650电池,最高放电容量为2297mAh,质量比能量为190Wh/kg;电池100％DOD,800mA充放循环600次,容量为初始容量的65％;50％DOD,1A充放循环1000次,放电终了电压由3.45下降到2.98V;电池经过过充、过放、短路、挤压等安全试验,未发生起火、爆炸现象．对电极的制作工艺和电池的设计工艺进行优化,设计出的18650样品电池容量为2530mAh,质量比能量达到210wh/kg,体积比容量550wh/L．     

Lithium secondary batteries using an asymmetric sulfonium-based room temperature ionic liquid as a potential electrolyte

A new asymmetric sulfonium-based ionic liquid, 1-butyldimethylsulfonium bis（trifluoromethylsulfonyl） imide （S114TFSI）, was developed as electrolyte material for lithium secondary battery. Its cathodic potential was a little more positive against the Li/Li＋, so vinylene carbonate （VC） was added into the LiTFSI/S114TFSI ionic liquid electrolyte to ensure the formation of a solid electrolyte interface （SEI）, which effectively prevented the decomposition of the electrolyte. The properties of the Li/LiMn2O4 cell containing S114TFSI-based electrolyte were studied and the cycle performances were compared to those with a conventional organic electrolyte （1 mol/L LiPF6/DMC：EC=1：1（w/w）） at room temperature. Electrochemical impedance spectroscopy （EIS） and X-ray diffraction （XRD） were conducted to analyze the mechanisms affecting the cell performances at different temperatures. The lithium secondary bat- tery system, using the above ionic liquid electrolyte material, shows good cycle performances and good safety at room temperature, and is worthwhile to further investigate so as to find out the potential application.     

高功率Li/FeS2电池的研制

随着信息技术的快速发展,用电器对电池的需求也日益增长,尤其是对高能量高功率电池的需求,而普通碱性电池显然无法满足这种要求.本文作者在国内率先成功研制了采用改性FeS2作为正极材料的AA型高能量高功率Li/FeS2电池.天然FeS2经过研磨、焙烧和酸洗,可最终制得改性FeS2.讨论了天然及改性FeS2的化学成分、物理性质和结构特征,并分别测试了二者组装成锂电池的放电容量.研究结果发现:FeS2的纯度、颗粒大小是影响Li/FeS2电池电化学性能的重要因素.在此基础上,对比了AA型Li/FeS2电池与同型号碱性电池的放电性能.Li/FeS2电池的整个制备过程完全满足环保的要求.研究表明:Li/FeS2电池是一种绿色、高功率的新型能源,具有广泛的应用前景.     

高功率Li／FeS2电池的研制

随着信息技术的快速发展，用电器对电池的需求也日益增长，尤其是对高能量高功率电池的需求，而普通碱性电池显然无法满足这种要求。本文作者在国内率先成功研制了采用改性FeS2作为正极材料的AA型高能量高功率Li／FeS2电池。天然FeS2经过研磨、焙烧和酸洗，可最终制得改性FeS2。讨论了天然及改性FeS2的化学成分、物理性质和结构特征，并分别测试了二者组装成锂电池的放电容量。研究结果发现：FeS2的纯度、颗粒大小是影响Li／FeS2电池电化学性能的重要因素。在此基础上，对比了AA型Li／FeS2电池与同型号碱性电池的放电性能。Li／FeS2电池的整个制备过程完全满足环保的要求。研究表明：Li／FeS2电池是一种绿色、高功率的新型能源，具有广泛的应用前景。     

Li[Li(1/3-x/3)Mn(2/3-2x/3)Cox]O2(x=O.1)的团簇自旋玻璃态行为

采用柠檬酸盐法制备了六方层状结构的Li[Li(1/3-x/3)Mn(2/3-2x/3)Cox]O2(x=0.1)材料.体系在高温区呈现顺磁态,通过拟合Curie-Weiss定律得到Curie和Weiss常数分别为1.70(2)m3 K/mol和-22(3)K.该材料的磁化率曲线在低温区表现出不可逆转变行为,并且这种不可...     

齐醚对阴离子丁苯共聚系活性种反应性的影响

本文研究了ＣＨ３ＯＣＨ２ＯＣＨ８和ＣＨ３Ｏ（ＣＨ２ＣＨ２Ｏ）２ＣＨ３为添加剂，对以ｎ－ＢｕＬｉ为引发剂，环己烷为溶剂的丁二烯－苯乙烯共聚合的影响，获得了影响聚合速度，共聚组成和微观结构的规律，探讨了两体系中各活性种的竞聚率和结构选择性，并与添加ＴＨＦ的体系进行了比较。     

复合金属氧化物正极材料 Li(CoxNiyMn1-x-y)O2高功率锂离子动力电池的试制及电化学性能的研究

用化学方法合成用于锂离子动力电池正极的新型高电压高容量复合金属氧化物材料Li(Co_xNi_yMn_1-x-y)O₂试制了具有良好热稳定性的高功率 8 Ah 锂离子动力 电池。在研究了该电池的电化学性能后, 研制了用于混合动力电动车辆的电池系统并进行了车载实验。结果表明该 电池系统在深度放电条件下不仅显现出十分优越的循环性能和一致性, 经过模拟工况测试后的数据还表明单体电池升温最高仅为 5℃, 即电池系统还具有良好的热稳定性, 因此该电池系统是适合用于混合动力电动汽车的。     

A Type of Lithium-ion Battery Based on Aqueous electrolyte

1 Introduction A new type of rechargeable lithium ion battery with an aqueous electrolyte was announced by W. Li et al. in 1994[1].This type of battery uses the lithium intercalation compounds LiMn2O4 and VO2 as electrode materials and an alkaline aqueous electrolytic solution. By this combination, the disadvantages of the non-aqueous Li-ion battery type, i.e. high cost and safety problems could be faded away[2]. So this type of aqueous Li-ion battery was regarded as the promising power for electric veh...     

Equilibrium lithium transport between nanocrystalline phases in intercalated TiO(2) anatase

Microcrystalline TiO(2) with an anatase crystal structure is used as an anode material for lithium rechargeable batteries, and also as a material for electrochromic and solar-cell devices. When intercalated with lithium, as required for battery applications, TiO(2) anatase undergoes spontaneous phase separation into lithium-poor (Li(0.01)TiO(2)) and lithium-rich (Li(0.6)TiO(2)) domains on a scale of several tens of nanometres. During discharge, batteries need to maintain a constant electrical potential between their electrodes over a range of lithium concentrations. The two-phase equilibrium system in the electrodes provides such a plateau in potential, as only the relative phase fractions vary on charging (or discharging) of the lithium. Just as the equilibrium between a liquid and a vapour is maintained by a continuous exchange of particles between the two phases, a similar exchange is required to maintain equilibrium in the solid state. But the time and length scales over which this exchange takes place are unclear. Here we report the direct observation by solid-state nuclear magnetic resonance of the continuous lithium-ion exchange between the intermixed crystallographic phases of lithium-intercalated TiO(2). We find that, at room temperature, the continuous flux of lithium ions across the phase boundaries is as high as 1.2 x 10(20) s(-1) m(-2).     

High-performance lithium–sulfur battery based on porous N-rich g-C3N4 nan-otubes via a self-template method

The commercial development of lithium–sulfur batteries (Li–S) is severely limited by the shuttle effect of lithium polysulfides (LPSs) and the non-conductivity of sulfur. Herein, porous g-C3N4 nanotubes (PCNNTs) are synthesized via a self-template method and util-ized as an efficient sulfur host material. The one-dimensional PCNNTs have a high specific surface area (143.47 m2·g?1) and an abundance of macro-/mesopores, which could achieve a high sulfur loading rate of 74.7wt%. A Li–S battery bearing the PCNNTs/S composite as a cathode displays a low capacity decay of 0.021% per cycle over 800 cycles at 0.5 C with an initial capacity of 704.8 mAh·g?1. PCNNTs with a tubular structure could alleviate the volume expansion caused by sulfur and lithium sulfide during charge/discharge cycling. High N contents could greatly enhance the adsorption capacity of the carbon nitride for LPSs. These synergistic effects contribute to the excellent cycling stability and rate performance of the PCNNTs/S composite electrode.     

MnO2掺杂的KNN基无铅压电陶瓷的制备及性能

采用传统的固相反应法制备了(1-x)(Na0.65K0.35)0.94Li0.06NbO3-xmol%MnO2无铅压电陶瓷,研究了Mn的掺杂对陶瓷压电和介电性能的影响.实验结果表明,所有的样品都显示出四方相钙钛矿结构.材料的平均晶粒尺寸随着MnO2掺杂量的增加逐渐变大.MnO2的添加使样品的压电常数d33、平面机电耦合系数kp、机械品质因数Qm、介电损耗tanδ和相对密度均得到明显改善.当MnO2的掺杂量为0.50mol%的时候,样品的性能达到最佳:d33=144pC/N,kp=42%,tanδ=2.4%,Qm=168.以上数据表明,该陶瓷材料是一种极具应用潜力的无铅压电陶瓷材料.     

离子掺杂对锂离子电池正极材料LiFePO4电化学性能的影响

采用一步高温固相合成法制备橄榄石型锂离子电池正极材料LixFe（1-y）MoyPO4／C,着重研究了不同锂铁比和铁位钼元素掺杂对材料的充放电性能的影响．结果表明：当Li：Fe=1．03：1时,磷酸铁锂的放电比容量和充放电循环性能最佳,首次放电比容量最高为100．8mAh／g;在富锂基础上,Mo掺杂的浓度为Li1.033Mo0.01Fe0.97PO4／C时,材料表现出的电化学性能最好,所能达到的最大比容量为144．8mAh／g．     

Design Optimization of Charger Based on PSPICE Simulation

The design of a high-frequency switching mode charger (HFSMC) was optimized using a PSPICE simulation of the charging system including a valve regulated lead-acid (VRLA) battery pack and the HFSMC.A high-frequency battery charging circuit model was developed to describe the battery dynamics when charging with DC current having high-frequency ripples. An IGBT circuit model, a high-frequency pulsed transformer coupling model and a silicon fast recovery diode model were also developed. Simulations were compared to laboratory measurements to verify the battery and system models. Simulation of the working states of an Fe-based nanocrystalline magnetic core used in the transformer shows that the transformer design can be optimized by adjusting the core gap and by employing an RC network. Further simulations show that the components in the output unit of the charger main circuit can also be optimized. Simulations also show that the battery dynamics Including the inductance should be considered for design optimization of the HFSMC.     

聚乙炔／SnO2异质结的光电流密度

用改进的Ｎａａｒｍａｎｎ法在ｎ型ＳｎＯ２基片上直接聚合成聚乙炔膜，制成ｐ－（ＣＨ）ｘ／ｎ－ＳｎＯ２异质结，用氩离子激光器作光源，测量了光电流密度与入射光强度的关系曲线．在仅考虑聚乙炔吸收光的情况下，从理论上导出聚乙炔基异质结的光电流密度公式，与实验结果相符合     

钛酸锂电极材料的研究进展

从锂离子电池负极材料钛酸锂Li4Ti5O12材料的结构性能出发,介绍了近几年国内外学者在Li4Ti5O12材料的基础研究方面的最新进展,对材料的制备工艺、掺杂及复合等改性研究进行了深入的讨论,提出了目前存在的问题和今后的发展方向.     

ROK为助引发剂的丁二烯调聚动力学研究

对以正丁基锂（n-BuLi）为引发剂、混甲基苯酚钾（ROK）为助引发剂、二甲苯为溶剂兼做链转移剂、二乙二醇二甲醚（2G）为极性调节剂的丁二烯阴离子调聚动力学进行了研究．考查了n（K）／,z（Li）、n（2G）／n（Li）和温度对聚合速率的影响及不同条件对液体聚丁二烯相对分子质量（M）和相对分子质量分布（PD）的影响．寥验结果表明：反应速率与单体浓度呈一次方关系;当n（K）／n（Li）、n（2G）／n（Li）增大,温度升高时．聚台反应表观增长速率常数增大;随n（K）／n（Li）的增加,聚合物相对分子质量下降,且分布加宽．所得液体聚丁二烯可用做绿色涂料基料．