CN106058217B - 一种钨酸锂材料及其制备与应用 - Google Patents
一种钨酸锂材料及其制备与应用 Download PDFInfo
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 57
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000000463 material Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000002253 acid Substances 0.000 title abstract description 15
- 229910010865 Li6W2O9 Inorganic materials 0.000 claims abstract description 23
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims abstract description 6
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 5
- CMPGARWFYBADJI-UHFFFAOYSA-L tungstic acid Chemical compound O[W](O)(=O)=O CMPGARWFYBADJI-UHFFFAOYSA-L 0.000 claims abstract description 3
- 229910052808 lithium carbonate Inorganic materials 0.000 claims abstract 2
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 claims description 35
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 229910003002 lithium salt Inorganic materials 0.000 claims description 4
- 159000000002 lithium salts Chemical class 0.000 claims description 4
- 150000003657 tungsten Chemical class 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 3
- 239000003738 black carbon Substances 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims 1
- 239000003643 water by type Substances 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052799 carbon Inorganic materials 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 9
- 230000002441 reversible effect Effects 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 239000013067 intermediate product Substances 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000012071 phase Substances 0.000 abstract description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000007791 liquid phase Substances 0.000 abstract description 3
- 239000007773 negative electrode material Substances 0.000 abstract description 3
- 238000010532 solid phase synthesis reaction Methods 0.000 abstract description 3
- 229910002986 Li4Ti5O12 Inorganic materials 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 230000002194 synthesizing effect Effects 0.000 abstract 1
- 238000007599 discharging Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 5
- 238000001291 vacuum drying Methods 0.000 description 5
- 229910001868 water Inorganic materials 0.000 description 5
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000002242 deionisation method Methods 0.000 description 3
- LTUDISCZKZHRMJ-UHFFFAOYSA-N potassium;hydrate Chemical compound O.[K] LTUDISCZKZHRMJ-UHFFFAOYSA-N 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910001290 LiPF6 Inorganic materials 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000003836 solid-state method Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229910007780 Li2W2O7 Inorganic materials 0.000 description 1
- 229910007786 Li2WO4 Inorganic materials 0.000 description 1
- 229910009866 Ti5O12 Inorganic materials 0.000 description 1
- CHBCHAGCVIMDKI-UHFFFAOYSA-N [F].C=C Chemical group [F].C=C CHBCHAGCVIMDKI-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
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- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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Abstract
本发明属于先进材料技术领域,具体为钨酸锂材料及其制备方法和应用。本发明以碳酸锂、三氧化钨为原料,采用柠檬酸辅助液相合成法,在60~80℃条件下即可生成含有Li6W2O9的中间产物,进一步通过热处理,制备纯相Li6W2O9和碳包覆Li6W2O9材料。相比于固相法,本方法降低了反应温度,减少了能耗,且设备简单。制备的Li6W2O9材料具有优良的电化学性能,可用作锂离子电池负极材料,其中,碳包覆的Li6W2O9在50 mA g‑1电流密度下,100次充放电循环后,可逆容量保持255 mAh g‑1,相比于目前商业化的钛酸锂(Li4Ti5O12)负极材料具有更高的可逆容量。
Description
技术领域
本发明属于先进材料技术领域,具体涉及一种钨酸锂(Li6W2O9)材料及其制备方法和应用。
背景技术
钨酸锂主要存在形式有Li2WO4(三方晶系、四方晶系、单斜晶系)、Li2W2O7和Li6W2O9(立方晶系),其中,通常采用固相法制备立方晶系的Li6W2O9,反应温度在600℃以上。本发明提出一种柠檬酸辅助液相法合成Li6W2O9的新方法,在80℃条件下即可生成含有Li6W2O9的中间产物,进一步通过热处理,制备纯相Li6W2O9和碳包覆Li6W2O9材料。相比于固相法,本方法降低了反应温度,减少了能耗,且设备简单。
发明内容
本发明的目的在于提供一种反应温度低,能耗少,性能优良的钨酸锂(Li6W2O9)及其制备方法,并把制备的钨酸锂(Li6W2O9)应用于锂离子电池负极材料。
本发明提供的钨酸锂(Li6W2O9)的制备方法,具体步骤为:
(1)将一定量的碳酸锂(Li2CO3)、三氧化钨(WO3)和柠檬酸(C6H8O7·H2O)溶于装有一定量去离子水的烧杯中;将烧杯置于恒温水浴中(60~80 ℃),并不断搅拌;待水分蒸干,得到白色样品;
(2)将步骤(1)得到的样品在70~90℃条件下,真空干燥12~24小时;
(3)将步骤(2)得到的样品在空气中,450~550 ℃下保温3~5小时,自然冷却后得到灰色钨酸锂(Li6W2O9)材料;
或者,将步骤(2)得到的样品在惰性气体中,300~500 ℃下保温3~5小时,自然冷却后得到黑色碳包覆钨酸锂(Li6W2O9)材料。
本发明中,锂盐和钨盐中锂与钨的摩尔比为3:0.8 ~3:1.2,优选锂与钨的摩尔比为3:1。
本发明中,柠檬酸的加入量为锂盐和钨盐总质量的5% ~20 %。
本发明中,所述的惰性气氛包括氮气(N2)或氩气(Ar)。
实验表明,本发明所制备的钨酸锂(Li6W2O9)具有良好的储锂活性,可将其应用于锂离子电池负极材料。
实验表明,本发明所制备的碳包覆的钨酸锂(Li6W2O9)可以有效提高材料的电化学性能,使得该材料具有更广泛的应用前景。
本发明首次将立方晶系钨酸锂(Li6W2O9)应用于锂离子电池负极材料。电化学测试结果表明,碳包覆的Li6W2O9在50 mA g-1电流密度下,100次充放电循环后,可逆容量保持255mAh g-1,相比于目前商业化的钛酸锂(Li4Ti5O12)负极材料具有更高的可逆容量。因此,该立方晶系钨酸锂(Li6W2O9)材料在储能领域具有良好的实际应用前景。
与现有技术相比,本发明具有以下几个显著的特点:
(1)本发明制备了一种新型的钨酸锂(Li6W2O9)材料;
(2)本发明涉及制备方法与传统固相法相比,降低了反应温度,减少了能耗;
(3)本发明涉及制备方法所需设备简单,适合于工业化生产。
本发明突出的实质性特点和显著进步可以从以下实施例中得以体现,但不限于此。
附图说明
图1为本发明提出的钨酸锂制备过程示意图。其中,a表示前驱体溶液,b表示中间产物,c表示热处理后得到的钨酸锂材料。
图2是本发明实施例1中白色样品的X射线衍射图谱。
图3是本发明实施例2中钨酸锂样品的X射线衍射图谱。
图4是本发明实施例2中钨酸锂样品的SEM图。
图5是本发明实施例2中钨酸锂样品的循环性能曲线,充放电电流密度为50 mA g-1,充放电电压范围为0.1 ~ 3.0 V。
图6是本发明实施例3中碳包覆钨酸锂样品的X射线衍射图谱。
图7是本发明实施例3中碳包覆钨酸锂样品的TEM图。
图8是本发明实施例3中碳包覆钨酸锂样品的首次充放电及第二次放电曲线,其中:曲线a是首次放电曲线,曲线b是首次充电曲线,曲线c是第二次放电曲线,充放电电流密度为50 mA g-1,充放电电压范围为0.1 ~ 3.0 V。
图9是本发明实施例3中碳包覆钨酸锂样品的循环性能曲线,充放电电流密度为50mA g-1,充放电电压范围为0.1 ~ 3.0 V。
图10是本发明实施例3中碳包覆钨酸锂样品的倍率特性曲线,充放电电压范围为0.1 ~ 3.0 V。
具体实施方式
以下结合实例和附图对本发明的具体实施作进一步说明,但本发明的实施和保护不限于此。
实施例1
称取1.33克碳酸锂,2.78 g 三氧化钨和0.38克一水合柠檬酸溶于60毫升去离子水中,置于80℃恒温磁力搅拌器上,不断搅拌至水分完全蒸干;在70℃条件下,真空干燥24小时,得到白色样品。
白色样品的XRD谱图(图2)表明,产物中含有立方晶系钨酸锂(Li6W2O9)(标准卡片:25-0503)。样品呈白色,主要原因是表面覆盖了一层有机质。因此,80℃条件下,液相反应可以直接生成钨酸锂,与传统固相法相比,极大地降低了反应温度,具有突出的节能优势。
实施例2
称取1.11克碳酸锂,2.32 g 三氧化钨和0.42克一水合柠檬酸溶于50 毫升去离子水中,置于80℃恒温磁力搅拌器上,不断搅拌至水分完全蒸干;在80℃条件下,真空干燥18小时,得到白色中间产物。将中间产物置于管式炉中,在空气气氛下,500℃下保温3小时,自然冷却后得到灰色钨酸锂材料。
灰色钨酸锂样品的XRD谱图如图3所示,该方法制备了纯相立方晶系的钨酸锂(Li6W2O9)材料(标准卡片:25-0503),谱图中不含杂质峰,产物纯度高。SEM图(图4)显示,样品由直径在2~4微米左右的微球组成。
将活性材料(实施例2中的钨酸锂材料)、导电剂(Super P)、粘结剂(聚偏氟乙烯)按一定质量比(8:1:1)加入溶剂(1-甲基-2-吡咯烷酮)中混合成浆料均匀涂于铜箔上,放置在真空干燥箱中100℃干燥24小时,切成直径为14毫米的圆片,称重后在充满氩气的手套箱中组装成CR2016型的扣式电池。其中,金属锂作为对电极,1 M LiPF6的EC/DMC(体积比为1:1)溶液作为电解液,采用Celgard-2300隔膜。恒电流充放电测试在LAND测试系统上进行。
该钨酸锂材料在0.1~3.0 V电压范围内的循环性能如图5所示。可以看出,在50 mAg-1的电流密度下,首次充放电比容量分别为145mAh g-1和329mAh g-1,较大的容量损失,可以归因于放电过程中形成了SEI膜,消耗了大量的Li+。100次充放电循环以后,放电比容量为78mAh g-1,对应库伦效率为99.2%。
实施例3
称取1.11克碳酸锂,2.32 g 三氧化钨和0.32克一水合柠檬酸溶于50 毫升去离子水中,置于70℃恒温磁力搅拌器上,不断搅拌至水分完全蒸干;在90℃条件下,真空干燥12小时,得到白色中间产物。将中间产物置于管式炉中,在N2气氛下,500℃下保温3小时,自然冷却后得到黑色碳包覆钨酸锂材料。
黑色的碳包覆钨酸锂样品的XRD谱图如图6所示,该方法制备了纯相立方晶系的钨酸锂(Li6W2O9)材料(标准卡片:25-0503),谱图中不含碳的特征峰。TEM图(图7)表明,表面包覆的碳层厚度在2纳米左右,且晶面间距为0.21纳米,对应于钨酸锂(Li6W2O9)的(400)晶面。
将活性材料(实施例3中的碳包覆钨酸锂材料)、导电剂(Super P)、粘结剂(聚偏氟乙烯)按一定质量比(8:1:1)加入溶剂(1-甲基-2-吡咯烷酮)中混合成浆料均匀涂于铜箔上,放置在真空干燥箱中100℃干燥24小时,切成直径为14毫米的圆片,称重后在充满氩气的手套箱中组装成CR2016型的扣式电池。其中,金属锂作为对电极,1 M LiPF6的EC/DMC(体积比为1:1)溶液作为电解液,采用Celgard-2300隔膜。恒电流充放电测试在LAND测试系统上进行。
该碳包覆钨酸锂材料在0.1~3.0 V电压范围内,电流密度为50 mA g-1时的首次充放电及第二次放电曲线如图8所示,循环性能如图9所示。可以看出,首次放电曲线在0.4 V左右有明显的平台,归因于放电过程中形成了SEI膜,消耗了部分的Li+,并造成了容量的不可逆损失。该材料的首次充放电比容量分别为358mAh g-1和560mAh g-1,第二次放电比容量为333 mAh g-1,放电和充电平台分别在0.1 V和1.0 V左右。在50 mA g-1的电流密度下,100次充放电循环以后,放电放电比容量为255mAh g-1,对应库伦效率为99.8%。相比于目前商业化的钛酸锂(Li4Ti5O12)负极材料具有更高的可逆容量,具有良好的应用前景。同时,相比于实施例2中未包覆的钨酸锂材料而言,碳包覆的钨酸锂材料在相同电流密度下,无论是充放电容量还是循环性能都具有显著改善,使得该钨酸锂(Li6W2O9)材料具有更广阔的应用前景。该碳包覆钨酸锂材料在0.1~3.0 V电压范围内的倍率特性如图10所示,在电流密度为50,100,200和500mA g-1条件下,可逆比容量分别为204,139,76和30 mAh g-1;经过大电流充放电以后,电流密度减小到50 mA g-1时,可逆比容量为199 mAh g-1,容量保持率为97.5%,表现出良好的倍率性能。
Claims (4)
1.一种钨酸锂Li6W2O9材料的制备方法,其特征在于,具体步骤为:
(1)将碳酸锂、三氧化钨和柠檬酸溶于装有一定量去离子水的烧杯中;将烧杯置于60~80 ℃恒温水浴中,并不断搅拌;待水分蒸干,得到白色样品;其中,锂盐和钨盐中锂与钨的摩尔比为3:0.8 ~3:1.2;柠檬酸的加入量为锂盐和钨盐总质量的5% ~20%;
(2)将步骤(1)得到的样品在70~90℃条件下,真空干燥12~24小时;
(3)将步骤(2)得到的样品在空气中,450~550 ℃下保温3~5小时,自然冷却后得到灰色钨酸锂Li6W2O9材料;
或者,将步骤(2)得到的样品在惰性气体中,300~500 ℃下保温3~5小时,自然冷却后得到黑色碳包覆钨酸锂Li6W2O9材料。
2.根据权利要求1所述的钨酸锂Li6W2O9材料的制备方法,其特征在于,步骤(3)中,所述的惰性气氛为氮气或氩气。
3.一种由权利要求1、2之一所述制备方法制备的钨酸锂Li6W2O9材料。
4.如权利要求3所述的钨酸锂Li6W2O9材料作为锂离子电池负极材料的应用。
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