CN115057416A - 一种LiIrSeO电极材料及其制备方法 - Google Patents
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- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000011669 selenium Substances 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 11
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 10
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000002244 precipitate Substances 0.000 claims abstract description 6
- 229910052711 selenium Inorganic materials 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 3
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000001354 calcination Methods 0.000 claims description 8
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 6
- JXTNYTBZEWFKNR-UHFFFAOYSA-L dilithium;selenate Chemical compound [Li+].[Li+].[O-][Se]([O-])(=O)=O JXTNYTBZEWFKNR-UHFFFAOYSA-L 0.000 claims description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- SMVMOIXTOKYXAN-UHFFFAOYSA-L dilithium;selenite Chemical compound [Li+].[Li+].[O-][Se]([O-])=O SMVMOIXTOKYXAN-UHFFFAOYSA-L 0.000 claims description 2
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 2
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 2
- 229940071264 lithium citrate Drugs 0.000 claims description 2
- WJSIUCDMWSDDCE-UHFFFAOYSA-K lithium citrate (anhydrous) Chemical compound [Li+].[Li+].[Li+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O WJSIUCDMWSDDCE-UHFFFAOYSA-K 0.000 claims description 2
- 229910052741 iridium Inorganic materials 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
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- 238000001878 scanning electron micrograph Methods 0.000 description 3
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
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- 238000003756 stirring Methods 0.000 description 2
- 229910012820 LiCoO Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000003991 Rietveld refinement Methods 0.000 description 1
- 238000003917 TEM image Methods 0.000 description 1
- IQZFSTRKPPXMMH-UHFFFAOYSA-N [Ir]=O.[Li] Chemical compound [Ir]=O.[Li] IQZFSTRKPPXMMH-UHFFFAOYSA-N 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
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- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
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Abstract
本发明公开了一种LiIrSeO电极材料及其制备方法,其化学式为Li2Ir1‑xSexO3,其中x小于等于0.4。制备方法包括以下步骤:(1)将铱黑、硒掺杂材料、锂源按照比例进行混合,加入粘结剂中混合摇匀,在室温至60℃下进行干燥并收集沉淀物,随后对所得沉淀物进行压片处理得到样品片;(2)将样品片放入马弗炉中进行煅烧,然后在空气中空冷处理,然后将所得样品取出并充分研磨。本发明使用湿法反应制备的LiIrSeO电极材料是Li‑Ir‑Se混合物,硒均匀掺杂在晶格内,当掺杂比例小于等于0.4,可获得单一纯相物质,制备出的材料Ir和Se均为+4价。本发明的制备方法简单,获得的电极材料掺杂均匀,成本相较于纯相有明显降低。
Description
技术领域:
本发明涉及电极材料制备技术领域,具体地说,涉及一种LiIrSeO电极材料及其制备方法。
背景技术:
随着全球能源与环境问题的日趋严峻,各国家、各行业都在积极寻求发展新能源,探索节能环保之路。1983M.Thackeray、J.Goodenough等人发现锰尖晶石是优良的正极材料,具有低价、稳定和优良的导电、导锂性能。其分解温度高,且氧化性远低于钴酸锂,即使出现短路、过充电,也能够避免了燃烧、爆炸的危险。在这方面,人们投入了大量精力来设计先进的正极材料,以提供更高的能量密度和更高的循环稳定性。在已经探索的众多阴极材料中,层状富锂TM氧化物被认为是满足上述需求的有希望的候选材料。这些材料的富锂特性通常被称为Li1+xTM1–xO2,需要在TM层中存在过量的Li阳离子,这导致Li/TM比理想的层状LiTMO2(x=0)结构(如LiCoO2)中的Li/TM更高。铱酸锂(Li2IrO3)作为一种经典的层状材料,具有与Li2RuO3结构相似的单斜晶胞。X射线Rietveld分析表明,Li2IrO3具有层状结构,不同的阳离子层(仅Li层和Li和Ir混合物层)沿c轴交替堆叠,并且在连续的LiIr2层中沿Ir六边形网络堆叠。其具有良好的容量以及优秀的循环可逆性,这使得其作为一种锂离子电池阴极材料被广泛关注,但是其仍具有一定的缺陷,比如容量尚有不足,并且稳定性也需要得到进一步的改进,因此,需要对铱酸锂材料进行改性以使其能够被更好地应用。
发明内容:
为了解决上述技术问题,弥补现有技术中存在的不足,本发明提供了一种LiIrSeO电极材料及其制备方法。
为了达到上述目的,本发明采用的技术方案如下:
一种LiIrSeO电极材料,其化学式为Li2Ir1-xSexO3,其中x小于等于0.4。
上述LiIrSeO电极材料的制备方法,包括以下步骤:
(1)将铱黑、硒掺杂材料、锂源按照比例进行混合,加入粘结剂中混合摇匀,在室温至60℃下进行干燥并收集沉淀物,随后对所得沉淀物进行压片处理得到样品片;
(2)将样品片放入马弗炉中进行煅烧,然后在空气中空冷处理,然后将所得样品取出并充分研磨。
作为优选的,在上述的电极材料的制备方法中,所述煅烧的参数设置为:初始温度为室温条件,以2-5度/分钟的速度逐渐升温到900-1280℃之间,并在1280℃下保温8-24小时,随后降温至700-850℃之间。
作为优选的,在上述的电极材料的制备方法中,所述硒掺杂材料为硒酸锂、亚硒酸锂或硒粉。作为优选的,在上述的电极材料的制备方法中,所述锂源为硒酸锂、氢氧化锂、碳酸锂或柠檬酸锂。作为优选的,在上述的电极材料的制备方法中,所述粘结剂为聚乙二醇或柠檬酸等。
与现有技术相比,本发明具有如下有益效果:本发明使用湿法反应制备的LiIrSeO电极材料是Li-Ir-Se混合物,硒均匀掺杂在晶格内,当掺杂比例小于等于0.4,可获得单一纯相物质,制备出的材料Ir和Se均为+4价。本发明的制备方法简单,获得的电极材料掺杂均匀,在不影响性能的前提下,成本相较于纯相有明显降低。
附图说明
图1为实施例1所制备的Li2Ir0.6Se0.4O3电极材料的XRD图谱及精修数据;
图2为实施例1所制备的Li2Ir0.6Se0.4O3电极材料的SEM图像;
图3为实施例2所制备的Li2Ir0.8Se0.2O3电极材料的XRD图谱及精修数据;
图4为实施例2所制备的Li2Ir0.8Se0.2O3电极材料的SEM图像。
具体实施方式
下面结合具体实例对本发明进一步详细描述,仅为了阐明本发明,而不是为了限制本发明的范围。
实施例1, Li2Ir0.6Se0.4O3电极材料的制备
1. 将500毫克铱黑、161毫克硒酸锂粉,135mg氢氧化锂粉末按照6:4:13的摩尔比例分别称取,加入30毫升0.1 mol/L浓度的聚乙二醇水溶液中,磁子搅拌混合摇匀。在室温至95℃下,静置溶液反应60分钟,放置60度烘箱干燥水分,获得灰色干燥粉末。随后对所得粉末采用压片机进行压片处理。
2. 将所压样品片放入马弗炉中进行煅烧,煅烧参数设置为初始温度为30度,以3度/分钟的速度逐渐升温到1280度,并在此温度下保温12小时,随后经过900分钟后降温至850度,最后在空气中空冷,煅烧结束后将所得样品取出并充分研磨。对所得Li2Ir0.6Se0.4O3电极材料进行测试,其XRD图谱及精修数据如图1所示,SEM图像如图2所示,从图1可以看出得出的物质为纯相,单斜晶系。图2可以看出颗粒大小均匀,尺寸在2~5微米大小。
实施例2, Li2Ir0.8Se0.2O3电极材料的制备
1. 将500毫克铱黑、60毫克硒酸锂粉,125mg氢氧化锂粉末按照4:1:8的摩尔比例分别称取,加入20毫升0.1 mol/L浓度的聚乙二醇水溶液中,磁子搅拌混合摇匀。在室温至95℃下,静置溶液反应60分钟,放置60度烘箱干燥水分,获得灰色干燥粉末。随后对所得粉末采用压片机进行压片处理。
2. 将所压样品片放入马弗炉中进行煅烧,煅烧参数设置为初始温度为30度,以3度/分钟的速度逐渐升温到1280度,并在此温度下保温12小时,随后经过900分钟后降温至850度,最后在空气中空冷,煅烧结束后将所得样品取出并充分研磨。对所得Li2Ir0.6Se0.4O3电极材料进行测试,其XRD图谱及精修数据如图3所示,TEM图像如图4所示,从图3可以看出得出的物质为纯相,单斜晶系。图4可以看出单个Li2Ir0.6Se0.4O3颗粒的尺寸大约在1微米左右。
Claims (6)
1.一种LiIrSeO电极材料,其化学式为Li2Ir1-xSexO3,其中x小于等于0.4。
2.如权利要求1所述的电极材料的制备方法,其特征在于,包括以下步骤:
(1)将铱黑、硒掺杂材料、锂源按照比例进行混合,加入粘结剂中混合摇匀,在室温至60℃下进行干燥并收集沉淀物,随后对所得沉淀物进行压片处理得到样品片;
(2)将样品片放入马弗炉中进行煅烧,然后在空气中空冷处理,然后将所得样品取出并充分研磨。
3.如权利要求2所述的电极材料的制备方法,其特征在于,所述煅烧的参数设置为:初始温度为室温条件,以2-5度/分钟的速度逐渐升温到900-1280℃之间,并在1280℃下保温8-24小时,随后降温至700-850℃之间。
4.如权利要求2所述的电极材料的制备方法,其特征在于,所述硒掺杂材料为硒酸锂、亚硒酸锂或硒粉。
5.如权利要求2所述的电极材料的制备方法,其特征在于,所述锂源为硒酸锂、氢氧化锂、碳酸锂或柠檬酸锂。
6.如权利要求2所述的电极材料的制备方法,其特征在于,所述粘结剂为聚乙二醇或柠檬酸。
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