等离子共振效应的Ag纳米颗粒修饰生物炭点/Bi4Ti3O12纳米片复合材料的制备及其光催化性能

众所周知,能源危机和环境污染是当前人们所面临的巨大难题和挑战,因此寻找或开发一种高新的技术解决上述难题尤为重要.近年来,基于半导体的光催化技术被广泛应用于能源制备和环境污染物去除领域,该技术通过直接转化太阳能为化学反应所需的能量来产生催化作用,使周围的氧气或水分子激发成活性物质,进而进行催化反应,且同时催化材料自身不受损耗,被认为是一种高效、安全的环境友好型技术.Bi_4Ti_3O_(12)是一种物理化学性质稳定、环境友好型的半导体材料,也是当前研究较多的一类铋系半导体光催化材料.然而,纯相的Bi_4Ti_3O_(12)纳米材料自身电子分离效率低且可见光响应范围窄,严重限制了其在光催化领域的应用.Ag纳米颗粒具有等离子共振效应,可以形成强的电场作用,从而增强光的利用和电子-空穴对的产生.碳点(CDs)是一类表面基团丰富、具有独特光物理性质的纳米级碳材料.碳点修饰的半导体光催化剂具有良好的稳定性和光催化活性.因此,制备Ag/CDs/Bi_4Ti_3O_(12)复合光催化剂可以有效扩宽Bi_4Ti_3O_(12)的光吸收范围,增强电子-空穴对的分离效率,从而提高光催化活性.本文利用竹子作为碳源,通过简单的水热法合成碳点,以熔盐法合成Bi_4Ti_3O_(12)纳米片,用简单的物理混合法将碳点修饰在Bi_4Ti_3O_(12)表面,再通过光沉积法将Ag~+还原在CDs/Bi_4Ti_3O_(12)的表面,从而制备出Ag/CDs/Bi_4Ti_3O_(12)复合光催化剂.以10mg/L的四环素水溶液作为目标污染物,测试光催化剂在可见光下对目标污染物的降解能力.采用X射线衍射(XRD)、傅里叶红外光谱(FT-IR)、透射电镜(TEM)、扫描电镜(SEM)、荧光光谱(PL)和光电流等表征方法分析了催化剂的结构特征、微观形貌和光电性质等.XRD分析表明Bi_4Ti_3O_(12)材料被成功合成,在CDs和Ag纳米颗粒进行修饰后未改变Bi_4Ti_3O_(12)的晶型结构.XPS和EDSmapping的结果均表明复合材料由Ag, C, Bi, Ti和O元素组成,说明Ag/CDs/Bi_4Ti_3O_(12)复合光催化剂成功制备.UV-visDRS结果表明, Ag和CDs的修饰扩宽了Bi_4Ti_3O_(12)的可见光吸收范围.荧光光谱和光电流结果也证明了Ag/CDs/Bi_4Ti_3O_(12)复合光催化剂具有更好的光响应能力和电子分离效率.光催化性能测试最终证实Ag/CDs/Bi_4Ti_3O_(12)复合光催化剂在可见光下具有良好的催化降解能力.循环实验说明Ag/CDs/Bi_4Ti_3O_(12)复合光催化剂具有很好的稳定性,是一种具有潜力的催化材料.用不同捕获剂进行了自由基捕获实验,研究了Ag/CDs/Bi_4Ti_3O_(12)复合光催化剂的催化机理,结果证实超氧自由基和空穴在光催化过程中起主要作用,羟基自由基也部分参与反应.总之,将碳点、Ag纳米颗粒与Bi_4Ti_3O_(12)结合制备的Ag/CDs/Bi_4Ti_3O_(12)复合光催化剂具有良好的光催化性能,该工作为相关材料的制备和光催化研究提供了理论依据.     

Li4Ti5O12/(Ag+C)电极材料的固相合成及电化学性能

以Li₂CO₃,TiO₂为原料,葡萄糖为碳源,采用固相煅烧工艺合成了亚微米级的Li₄Ti₅O₁₂/C复合负极材料。并将之与AgNO₃复合,采用固相方法制备出了Ag表面修饰的Li₄Ti₅O₁₂/(Ag+C)复合材料。采用XRD、SEM和TEM测试方法对材料的微结构进行了表征。结果表明,C的存在对Ag单质在Li₄Ti₅O₁₂/C颗粒表面的大量形成起到了积极的促进作用,从而很大程度地提高了Li₄Ti₅O₁₂/C的电导率,因此有效地改善了其电化学性能。在1C倍率下,Li₄Ti₅O₁₂/(Ag+C)复合材料的首次放电容量达到了164 mAh·g^-1。     

双功能仿生膜修饰改性Li_4Ti_5O_(12)负极材料

采用简单有效的自聚合方法在Li_4Ti_5O_(12)颗粒表面包覆兼具离子导电和电子导电双重功效的聚多巴胺(PDA)/导电碳黑Super P(SP)复合包覆层,获得了电化学性能优异的锂离子电池负极材料.利用X射线粉末衍射(XRD)、扫面电子显微镜(SEM)、透射电子显微镜(TEM)、充放电循环曲线和循环伏安(CV)等方法对复合材料的形貌、结构以及电化学性能进行表征.结果表明,当PDA包覆层的厚度为10 nm、Super P的含量为3%(质量分数)时,得到的包覆材料展示了优异的电化学性能:0. 2C倍率下初始放电容量为175m A·h/g,循环150周后,可逆放电容量仍在160 m A·h/g以上.     

N-K_2Ti_4O_9/UiO-66-NH_2复合材料的协同效应及其光催化降解阳离子型染料（英文）

半导体光催化剂作为一种可再生和可持续降解有机污染物的材料被广泛研究.K_2Ti_4O_9由于无毒、低成本、稳定的物理化学性质和独特的光电性能被应用于光催化反应.但是,K_2Ti_4O_9只能被紫外光所激发(因为其带隙能为3.2–3.4 e V),所以大量工作致力于研究如何降低其带隙能,从而使其可以被太阳光中的可见光激发,扩大其应用范围.其中N元素掺杂K_2Ti_4O_9(N-K_2Ti_4O_9)是最常见的方法之一.单纯的N-K_2Ti_4O_9虽然具有光催化能力,但其吸附容量太小,不能有效地将溶液中的有机物吸附至其表面,因而催化降解有机物效果不显著.UiO-66-NH_2是一种Zr基金属-有机骨架化合物,它对阳离子染料具有良好的吸附性能,且具有一些常规无机半导体光催化材料所没有的性质.本文将UiO-66-NH_2和N-K_2Ti_4O_9经高温焙烧制备了N-K_2Ti_4O_9/UiO-66-NH_2复合材料,发现该复合材料不仅具有UiO-66-NH_2优良的吸附性能,还因为复合提高了其光电性能,从而大大提高了光催化性能,当N-K_2Ti_4O_9/ZrCl_4质量比为3:7时光催化性能最佳.为了考察N-K_2Ti_4O_9/UiO-66-NH_2复合材料的微观形貌、复合结构及光生电子-空穴分离效率,首先通过场发射透射电镜分析N-K_2Ti_4O_9,UiO-66-NH_2和N-K_2Ti_4O_9/UiO-66-NH_2(3:7)复合材料的形貌,然后采用能量散射谱测定复合材料的元素分布,并利用N-K_2Ti_4O_9和UiO-66-NH_2中代表性元素K,Ti和Zr的分布判断复合材料的复合结构,最后运用高分辨电镜观察复合材料中N-K_2Ti_4O_9和UiO-66-NH_2的异质结界面,确定了两者是通过自组装复合在一起,而不是简单的物理混合.X射线衍射结果表明,复合材料具有N-K_2Ti_4O_9和UiO-66-NH_2两者的特征衍射峰,仅在强度和位置上略有变化.这可能是N-K_2Ti_4O_9/UiO-66-NH_2异质结构所致.通过UiO-66-NH_2和N-K_2Ti_4O_9的紫外-可见吸收光谱,用公式计算出它们的带隙能分别是2.645和3.195 e V,与文献结果基本一致.由于光催化剂的光生载流子迁移速率同样影响光催化性能,因此我们在CHI-660D电化学工作站上控制光源反复开关数次,同时记录N-K_2Ti_4O_9,UiO-66-NH_2和N-K_2Ti_4O_9/UiO-66-NH_2(3:7)的光响应电流,发现N-K_2Ti_4O_9/UiO-66-NH_2(3:7)复合材料展现出最高的光响应电流强度,表明其具有最高的光生载流子迁移速率和最低的光生载流子复合速率.可见,N-K_2Ti_4O_9和UiO-66-NH_2复合有利于光生载流子迁移,这可能是由于N-K_2Ti_4O_9/UiO-66-NH_2异质结界面有利于光生载流子在两种材料之间迁移所致.测试了N-K_2Ti_4O_9/UiO-66-NH_2(3:7)复合材料对不同染料的光催化降解性能.结果发现,该材料对阳离子型染料(罗丹明B和亚甲基蓝)的光催化性能远远高于对阴离子型染料(甲基橙和刚果红).这是由于它对阳离子型染料的吸附性能远高于对阴离子型染料,因此N-K_2Ti_4O_9/UiO-66-NH_2复合材料对阳离子型染料具有选择性光催化.     

Synthesis of carbon-coated Li4Ti5O12 and its electrochemical performance as anode material for lithium-ion battery

Carbon-coated Li_4Ti_5O_(12) sample was synthesized by a sol-gel method. The Li_4Ti_5O_(12) powders were obtained by calcinations of the gels at 750, 800, 850,900 ℃ at N_2 atmosphere. The structure, morphology and electrochemical properties of the materials were characterized by SEM, XRD and charge and discharge. The final product sintered at 850 ℃ demonstrates excellent performance with a specific capacity of 163.5 mAh/g after 100 cycles at 1C. Furthermore, the discharge specific capacity of the sample can retain 80 mAh/g at 10C.     

甲烷氧化偶联Ti-La-Li系混合氧化物催化剂

研究了Ti-La-Li三元氧化物的组成、结构及其对甲烷氧化偶联反应的催化性能；用XRD、IR、XPS和SEM等方法对催化剂进行表征，结果表明：在LiTi_xLa_(1-x)O_2系列催化剂中，随x值的不同，可生成LaTi_(1－y)Li_yO_(3-λ)、Li_2TiO_3、La_(0.66)TiO_(2.993)、La_2O_3和Li_(1.33)Ti_(1.66)O_4几种物相，其中，钙钛矿到三元复合氧化物LaTi_(1-y)Li_yO_(3-λ)是甲烷氧化偶联反应的主要活性相，活性位Li~＋-O~－-Ti~(3＋)的形成是活性提高的主要原因．Li_2TiO_3和La_(0.66)TiO_(2.993)是深度氧化活性相，而Li_(1.33)Ti_(1.66)O_4既无偶联活性，也无深度氧化活性．     

负载银纳米粒子的多酸银盐复合材料的可见光催化性能研究

通过固相研磨法,选取具有不同中心杂原子的Keggin型多酸(H_3PW_(12)O_(40)、H_4SiW_(12)O_(40)、K_5BW_(12)O_(40))固体与硝酸银固体反应,制备得到了系列低溶解度的多酸银盐前驱体(Ag_nPOM).再以这类多酸银盐为基质,通过紫外光照,使其中部分抗衡阳离子Ag~+原位还原生成金属Ag纳米粒子,进而可获得一系列具有不同Ag纳米粒子负载量的Ag_x~0/Ag_n~IPOM复合材料.固体漫反射光谱表明,Ag纳米粒子的表面等离子体(plasmon)共振吸收导致复合材料在可见光区域的吸收明显增加.这类复合材料在可见光照射下对光催化降解甲基橙和光还原Cr(Ⅵ)展现出高效、稳定的催化活性.随着阴离子所带电荷的增加,Ag纳米粒子的负载量明显增加,可见光吸收增强,因此光催化活性越高.Ag_x~0/Ag_5~IBW_(12)O_(40)展现最佳的光催化活性.     

TiO_2分级结构/Ag_3PO_4复合材料的可见光催化性能

制备了具有分级结构的海胆状TiO2纳米材料,并通过原位沉积法将可见光响应的Ag3PO4纳米颗粒沉积到TiO2的纳米分级结构上,合成了具有高效稳定可见光催化性能的系列TiO2分级结构/Ag3PO4复合材料,对比测试了系列材料对罗丹明B(RhB)的光催化降解性能.结果表明,TiO2分级结构/Ag3PO4复合材料光催化性能明显高于纯相的Ag3PO4光催化剂,同时也明显优于TiO2(P25)/Ag3PO4复合光催化剂,其中分级结构TiO2与Ag3PO4摩尔比为1∶1的复合材料具有最强的光催化性能,在可见光照射6min内可实现RhB的完全脱色.分析结果表明,与纳米颗粒TiO2相比,具有海胆状纳米结构的TiO2可为Ag3PO4的负载提供更多的担载位点,增加TiO2和Ag3PO4的接触面积,进而提升Ag3PO4光激发产生的光生电子-空穴的分离效率.同时在光降解过程中,Ag3PO4表面存在的少量Ag+会逐渐还原成单质Ag0,通过Ag0的等离子体共振效应,可增加对光子的吸收转换能力,从而进一步提高该复合材料光催化降解染料的性能.     

Li3Fe2(PO4)3正极材料的制备及电化学性能研究

本文以本文通过高温固相反应合成了Nasicon型的Li_3Fe_2(PO_4)_3电极材料。XRD结果显示850℃烧结得到的Li_3Fe_2(PO_4)_3结晶性最好。为了优化Li_3Fe_2(PO_4)_3电极的性能,使用行星球磨将制备得到的Li_3Fe_2(PO_4)_3与乙炔炭黑混合均匀,得到了Li_3Fe_2(PO_4)_3/C复合正极材料。扫描电镜照片显示,球磨后活性材料的颗粒尺寸明显减小,而且更加均匀。对于Fe~(3 )/Fe~(2 )的氧化还原电对,恒电流充放电测试和伏安循环法揭示Li_3Fe_2(PO_4)_3/C复合正极材料再放电过程中在2.8和2.7V具有两个电压平台。样品球磨后,与800℃和900℃烧结得到的Li_3Fe_2(PO_4)_3相比,850℃烧结得到的材料具有更好的可逆性和更高的容量保持性,而且它的比容量在初始循环以C/20的倍率放电可以达到92 mAhg~(-1)以及在结束时的循环以C/10的倍率放电还具有62 mAhg~(-1)。     

SO~(2-)_4掺杂对Nasicon型Li_3Fe_2(PO_4)_3正极材料电化学性能的影响

采用溶胶-凝胶法用SO~(2-)_4部分代替Li_3Fe_2(PO_4)_3中的PO~(3-)_4阴离子制得Li_(3-x)Fe_2(PO4)_(3-x)(SO_4)_x(x=0~0.90)正极材料,通过X射线衍射、充放电技术、循环伏安特性测试及电化学阻抗谱表征了掺杂材料的相组成及电化学性能.结果表明,SO~(2-)_4主要以固溶形式存在于Li_3Fe_2(PO_4)_3中,产物中还伴有少量Fe_2O_3第二相析出.SO~(2-)_4掺杂使Li_3Fe_2(PO_4)_3的放电容量呈抛物线形规律变化,并在掺杂浓度x=0.60时达到最佳值,该样品在0.5C倍率下的首次放电容量为111.59 mA·h/g,比未掺杂的样品提高了18.4%;60次循环充放电后的容量保持率为96%;将该样品的放电倍率由0.5C逐渐提高至5C,再降至0.5C,并在每个倍率下循环10次,材料的最终放电容量仍能达到首次放电容量的97%.导致这些变化的原因是SO~(2-)_4掺杂使材料的氧化还原性能增强,电池内阻减小,极化程度降低及Li~+扩散系数增大.     

Synthesis and performance of Li_4Ti_5O_(12) anode materials using the PVP-assisted combustion method

Li_4Ti_5O_(12) was synthesized by a facile gel-combustion method(GCM) with polyvinylpyrrolidone(PVP) as the polymer chelating agent and fuel.The structural and electrochemical properties of the sample were compared with the one prepared by the conventional solid-state reaction(SSR) through X-ray diffraction(XRD),scanning electron microscopy(SEM),cyclic voltammetry(CV),charge-discharge measurements,and electrochemical impedance spectroscopy(EIS),respectively.The sub-microscale Li_4Ti_5O_(12) oxides,with a high phase purity and good stoichiometry,can be obtained by annealing at 800 C.The grain size is smaller than that of the samples that were power prepared by SSR.Lithium-ion batteries with a GCM Li_4Ti_5O_(12) anode exhibit excellent reversible capacities of 167.6,160.7,152.9,and 144.2 mAh/g,at the current densities of 0.5 C,1 C,3 C and 5 C,respectively.The excellent cycling and rate performance can be attributed to the smaller particle size,lower charge-transfer resistance and larger lithium ion diffusion coefficient.It is therefore concluded that GCM Li_4Ti_5O_(12) is a promising candidate for applications in highrate lithium ion batteries.     

Electrochemical Performance of Li_4Ti_5O_(12) Prepared by Different Methods

A series of Li4Ti5O12 materials were prepared by three different methods： solvothermal, sol-gel, and solid-state reaction methods. Phase composition, morphology, and particle sizes of the samples were studied by powder X-ray diffraction （XRD） and scanning electron microscopy （SEM）. Electrochemical properties of the samples were investigated by charge-discharge tests. It is demonstrated that both sol-gel and solid-state reaction methods provided good control over the chemical composition and microstructure of the active material, in which sol-gel method yielded a fine Li4Ti5O12 spinel having an initial specific capacity of 146 mAh g-1 and low capacity fade during cycling. Comparatively, the solid-state method is simple and promising to prepare Li4Ti5O12 for commercial applications.     

Interface charges boosted ultrafast lithiation in Li_4Ti_5O_(12) revealed by in-situ electron holography

It is still a great challenge at present to combine the high rate capability of the electrochemical capacitor with the high electrochemical capacity feature of rechargeable battery in energy storage and transport devices.By studying the lithiation mechanism of Li_4Ti_5O_(12)(LTO)using in-situ electron holography,we find that double charge layers are formed at the interface of the insulating Li_4Ti_5O_(12)(Li4)phase and the semiconducting Li_7Ti_5O_(12)(Li7)phase,and can greatly boost the lithiation kinetics.The electron wave phase of the LTO particle is found to gradually shrink with the interface movement,leaving a positive electric field from Li7 to Li4 phase.Once the capacitive interface charges are formed,the lithiation of the core/shell particle could be established within 10 s.The ultrafast kinetics is attributed to the built-in interface potential and the mixed Ti~(3+)/Ti~(4+)sites at the interface that could be maximally lowering the thermodynamic barrier for Li ion migration.     

Li_(1.3)Ti_(1.7)Al_(0.3)(PO_4)_3,Na_(1.3)Ti_(1.7)Al_(0.3)(PO_4)_3的离子交换研究

研究了在不同温度下的NaNO3和AgNO3水溶液中Li1.3Ti1.7Al0.3(PO4)3和Na1.3Ti1.7Al0.3(PO4)3离子交换行为.实验表明Li1.3Ti1.7Al0.3(PO4)3和Na1.3Ti1.7Al0.3(PO4)3均显示出了高选择性与Na+和Ag+进行离子交换的特征,且对Ag+的选择性高于Na+.升高温度可显著提高Ag/Li和Ag/Na的交换反应速度.     

Effect of rich R-TiO_2 on the rate and cycle properties of Li_4Ti_5O_(12) as anode for lithium ion batteries

Li_4Ti_5O_(12)(LTO) with rich R-TiO_2(17.06, 23.69, and 34.42 wt%), namely, R-TiO_2@Li_4Ti_5O_(12) composites, were synthesized using the hydrothermal method and tetrabutyl titanate(TBT) as the precursor. Rietveld refinement of X-ray diffraction(XRD) results show that the proportion of Li occupying 16 d sites is extraordinary low and the lattice constants of LTO and R-TiO_2 change with the titanium dioxide content. EIS measurements showed that with increasing R-TiO_2 content, both its charge transfer impedance(Rct) and lithium ion diffusion coefficient(DLi) decreased. The changes of Rctand DLicaused by the increase of titanium dioxide content have synergic-antagonistic effects on the rate and cycle properties of Li_4Ti_5O_(12). The rate performance is positively related to DLi, while the cycle property is negatively correlated with Rct,indicating that the rate performance is mainly related to DLi, while Rctmore significantly affects the cycle performance. LTO-RT-17.06% exhibited excellent rate properties, especially under a high current density(5.0 C, 132.5 mAh/g) and LTO-RT-34.42% showed superior long-term cycle performance(0.012% capacity loss per cycle) compared to that of LTO-RT-17.06% and LTO-RT-23.69%.     

Facile preparation of core-shell Si@Li_4Ti_5O_(12) nanocomposite as large-capacity lithium-ion battery anode

As a promising alternative anode material,silicon(Si)presents a larger capacity than the commercial anode to achieve large capacity lithium-ion batteries.However,the application of pure Si as anode is hampered by limitations such as volume expansion,low conductivity and unstable solid electrolyte interphase.To break through these limitations,the core-shell Si@Li_4Ti_5O_(12)nanocomposite,which was prepared via in-situ self-assembly reaction and decompressive boiling fast concentration method,was proposed in this work.This anode combines the advantages of nano-sized Si particle and pure Li_4Ti_5O_(12)(LTO)coating layer,improving the performance of the lithium-ion batteries.The Si@Li_4Ti_5O_(12)anode displays a high initial discharge/charge specific capacity of 1756/1383 m Ah g~(-1)at 500 m A g~(-1)(representing high initial coulombic efficiency of 78.8%),a large rate capability(specific capacity of 620 m Ah g~(-1)at4000 m A g~(-1)),an outstanding cycling stability(reversible specific capacity of 883 m Ah g~(-1)after 150 cycles)and a low volume expansion rate(only 3.3%after 150 cycles).Moreover,the synthesis process shows the merits of efficiency,simplicity,and economy,providing a reliable method to fabricate large capacity Si@Li_4Ti_5O_(12)nanocomposite anode materials for practical lithium-ion batteries.     

Understanding the roles of Ti on the structure and electrochemical performances of Li_2Ru_(1-x)Ti_xO_3 cathode materials for Li-ion batteries

The lattice doping has been widely used to improve the electrochemical performances of Li-rich cathode materials but the roles of the introduced foreign atoms are still not very clear.Herein,a series of Li_2Ru_(1-x)Ti_xO_3 solid solutions have been synthesized and the roles of Ti doping on the structural and electrochemical properties of Li_2RuO_3 have been comprehensively investigated.The Rietveld refinement exhibits that the interlayer spacing gradually shortens with increasing Ti content.This shrinkage is favorable to the layered structure stability but increases the lithium diffusion barrier.Galvanostatic measurements show that Li_2Ru_(0.8)Ti_(0.2)O_3 possesses the best cyclability with 196.9 and 196.1 m Ah g~(-1)for charge and discharge capacity retaining after 90 cycles,respectively.Cyclic voltammetry scanning indicates that Ti dopant promotes the formation of more peroxo-or superoxo-like species but reduces the initial coulumbic efficiency.Results of electrochemical impedance spectroscopy display that Ti doping reduces the charge transfer impedance,which facilitates the lithium-ion diffusion across the electrolyteelectrode interface and improves the electronic conductivity.Li_2Ru_(0.8)Ti_(0.2)O_3exhibits the best electrochemical performance owing to the balance among all the factors discussed above.This study also offers some new insights into optimizing the electrochemical performances of Li-rich cathode materials through the lattice doping.     

Nanostructured Ni/Ti_3C_2T_x MXene hybrid as cathode for lithium-oxygen battery

Ti_3C_2 belongs to MXenes family,which is a new two-dimensional material and has been applied in many fields.With simple method of hydrothermal and high temperature calcination,nano structured Ni/Ti_3C_2T_x hybrid was synthesized.The stable layer structure of Ti_3C_2 MXene providing high surface area as well as excellent electronic conductivity are beneficial for deposition and decomposition of discharge product Li_2O_2.Furthermore,possessing special catalytic activity,Ni nanoparticles with size of about 20 nm could accelerate Li_2O_2 breaking down.Taking advantage of two kinds of materials,Ni/Ti_3C_2T_x hybrid as cathode of Li-O_2 battery can achieve a maximal specific capacity of 20,264 mAh/g in 100 mA/g and 10,699 mAh/g in 500 mA/g at the first cycle.This work confirms that the prepared Ni/Ti_3C_2T_x hybrid exhibiting better cycling stability points out a new guideline to improve the electrochemical performance of lithium-oxygen batteries.     

单斜Li3V2(PO4)3/C复合材料的制备及其电化学性能

以LiOH·H2O、V2O5、H3PO4和蔗糖为原料,采用软化学法制备了锂离子电池正极材料Li3V2(PO4)3/C.通过X射线衍射(XRD)、扫描电镜(SEM)对产物的结构和形貌进行表征,采用恒电流充放电、电化学阻抗考察了产物的电化学性能.结果表明.当煅烧温度达到700℃时,杂质相衍射峰消失,所得的样品为纯相的单斜Li3V2(PO4)3.颗粒粒度为1～2 μm;在3.0～4.5 V电压范围内以0.2C倍率充放电,首次放电比容量达到148.2 mAh·g-1,第50次循环比容量仍为144 mAh·g-1,容量保持率为97%,具有良好的循环性能;另外,样品还具有很好的倍率性能和高温性能.