CN114388814B - 一种Co0.85Se纳米颗粒@3D碳网络复合材料的制备方法及其在锂硫电池中的应用 - Google Patents
一种Co0.85Se纳米颗粒@3D碳网络复合材料的制备方法及其在锂硫电池中的应用 Download PDFInfo
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 68
- 239000002131 composite material Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 title claims abstract description 20
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- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims description 11
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims description 11
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- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
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- 238000001816 cooling Methods 0.000 claims description 4
- 229910052573 porcelain Inorganic materials 0.000 claims description 4
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 4
- 239000001509 sodium citrate Substances 0.000 claims description 4
- GJEAMHAFPYZYDE-UHFFFAOYSA-N [C].[S] Chemical compound [C].[S] GJEAMHAFPYZYDE-UHFFFAOYSA-N 0.000 claims description 3
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- 229910017052 cobalt Inorganic materials 0.000 claims 1
- 239000010941 cobalt Substances 0.000 claims 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims 1
- 239000007789 gas Substances 0.000 claims 1
- 229920001021 polysulfide Polymers 0.000 abstract description 10
- 239000005077 polysulfide Substances 0.000 abstract description 10
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052744 lithium Inorganic materials 0.000 abstract description 6
- 150000002500 ions Chemical class 0.000 abstract description 5
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- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明属于无机功能纳米材料合成领域,特别是涉及一种Co0.85Se纳米颗粒@3D碳网络复合材料的制备方法及其在锂硫电池中的应用。通过以下步骤实现:(1)高温煅烧法制备3D纳米碳骨架;(2)室温条件下,3D碳片表面负载小尺寸ZIF‑67;(3)结合高温热解和同步硒化处理,制备Co0.85Se纳米颗粒@3D碳网络复合材料。本申请提供的复合材料,具备原料易得,价格低廉,合成简单,易于大规模生产的特点。该材料3D交联的碳骨架结构,有利于硫的均匀分布和电荷的持续传输,且碳表面负载的Co0.85Se纳米小颗粒可提供丰富的活性位点,吸附并催化多硫离子,基于协同增效作用,有效提高多硫化锂的转化动力学。
Description
技术领域
本发明属于无机功能纳米材料合成领域,具体涉及一种锂硫电池硫载体的制备方法,特别是涉及一种Co0.85Se纳米颗粒@3D碳网络复合材料的制备方法及其在锂硫电池中的应用。
背景技术
锂硫电池作为一种新型的二次电池,由于硫单质具有储量丰富,价格低廉等诸多优点并且硫的理论比容量和能量密度分别高达1672 mAh g-1和2600 Wh kg-1,被认为一种极有潜力的储能系统,为满足现代电子器件及电动汽车的高能量密度的迫切需求提供一条可行的研究道路。
然而,由于活性物质硫单质的导电性差,中间放电产物多硫化锂溶于电解液造成“穿梭效应”且充放电过程中正极存在严重的体积膨胀等导致锂硫电池的活性物质利用率低、循环稳定性差以及电化学反应动力学迟滞等难题,阻碍了锂硫电池的商业化应用。有效抑制穿梭效应,促进多硫离子的动力学转化,缓解体积膨胀是提高锂硫电池电化学性能的关键。而合理构筑具有不同化学组成和结构的载体材料用以容硫/固硫,被普遍认为是提高锂硫电池性能的有效手段,其中典型的载体主要归结为两类,即高导电的碳材料和高极性的金属化合物。碳材料(如碳球,石墨烯,碳管/碳纤维等)具有低密度、高导电和结构多样易设计等优点,利用其导电表面和纳米孔道的物理吸附作用,可有效促进电子传输并缓解多硫化锂的扩散,但由于非极性碳表面与极性的多硫化锂之间亲和力较弱,导致电池的比容量依然会持续衰减。金属化合物(如金属氧化物,硫化物,硒化物,磷化物等)具有较高的表面化学极性,可以有效的吸附及催化多硫离子,但其本身的导电性差强人意。因此,将高导电的碳骨架与高极性的金属化合物复合,基于协同增效思想构筑多功能的金属化合物@碳基材料,成为设计硫载体的热门方案。
石墨烯作为典型的二维碳材料,具备大的比表面积和高导电性,是一种良好的导电碳骨架,但其制备成本较高。金属有机框架(MOFs)作为一类由金属离子和多齿有机配体自组装成的具有多维孔道结构的聚合物,兼具金属原子、碳原子及氮/硫等杂原子,因此,将各类MOFs作为前驱体,利用热熔法制备碳包覆金属化合物是目前合成极性金属化合物常用的方法之一。然而,上述MOFs衍生的碳包覆金属化合物在锂硫电池应用中仍存在一些亟待优化的问题:(1)高温碳化后的衍生体比表面积和孔径较小,不利于硫的均匀分布和电解液的渗透。(2)MOFs衍生体作为一个独立的结构单元,不利于电荷的持续传输。(3)碳化过程中金属源逐渐团聚,极易形成粒径较大的金属化合物,导致较少的活性位点和低的原子利用率。综合上述分析,开发一类低成本、高导电并兼具高极性特征的金属化合物@碳骨架复合材料用于锂硫电池性能研究具有十分重要的意义。
发明内容
针对上述问题,本发明提供一种制备步骤简单、成本低廉的Co0.85Se纳米颗粒@3D碳网络复合材料的制备方法。
本发明还提供了一种Co0.85Se纳米小颗粒@3D碳网络复合材料的应用。
本发明为了实现上述目的所采用的技术方案为:
本发明提供了一种Co0.85Se纳米颗粒@3D碳网络复合材料的制备方法,包括以下步骤:
(1)3D 纳米碳骨架的制备
将柠檬酸钠置于瓷舟中并在惰性气氛中烧结,洗涤并干燥,得3D 纳米碳片;
(2)小尺寸ZIF-67@3D碳片前驱物的制备
称取3D纳米碳片置于硝酸钴的甲醇溶液中,搅拌,并滴加含2-甲基咪唑的甲醇溶液,搅拌均匀后静置,洗涤干燥,制成小尺寸的ZIF-67@3D碳片前驱物;
(3)Co0.85Se纳米颗粒@3D碳网络复合材料的制备
称取ZIF-67@3D碳片前驱物与硒粉,将其均匀混合后,置于高温管式炉中通入氩氢混合气(5% H2),煅烧,结束后自然冷却至室温,获得Co0.85Se纳米颗粒@3D碳网络复合材料。
进一步的,步骤(1)中,所述烧结为800~900℃温度下烧结1-3h;所述惰性气氛为N2。
进一步的,步骤(2)中,所述硝酸钴的甲醇溶液浓度为0.015 mol/L~0.03 mol/L;所述3D纳米碳片和硝酸钴溶液的比例为0.1~0.2 g:30 mL。
进一步的,步骤(2)中,所述2-甲基咪唑的甲醇溶液浓度为0.18 mol/L~0.36 mol/L;所述含硝酸钴的甲醇溶液和2-甲基咪唑的甲醇溶液的体积比为1.5:1。
进一步的,步骤(2)中,所述搅拌的温度为20~50℃,搅拌时间为1~3h;所述静置时间为3~6 h。
进一步的,步骤(3)中,所述ZIF-67@3D碳片前驱物和硒粉的质量比为1:0.8~1.2。
进一步的,步骤(3)中,所述煅烧为以每分钟2℃升温速率升到800~1000℃,保持2~6h。
本发明还提供了一种利用上述方法制备得到的Co0.85Se纳米颗粒@3D碳网络复合材料在锂硫电池中作为硫载体的应用。
本发明利用上述硫载体制备成正极材料的方法为:将硫单质和Co0.85Se纳米颗粒@3D碳网络复合材料按照质量比8:2混合均匀后,将所得硫碳混合物放入充满氩气的密封容器中,在155℃ 条件下加热12h, 得到锂硫电池正极材料。
本发明制备得到的Co0.85Se纳米颗粒@3D碳网络复合材料具备3D交联网络骨架和丰富的孔道结构,便于电子的持续运输和硫的均匀分布,且碳表面均匀分布大量的ZIF-67衍生的氮掺杂碳包覆Co0.85Se纳米颗粒,可以提供大量的活性位点,加速多硫离子的动力学转化,相应电池具有良好的循环稳定性能。该发明对促进锂硫电池的市场化应用具有积极的参考价值。
本发明的有益效果为:
1)本申请提供的小尺寸Co0.85Se纳米颗粒@3D碳网络复合材料,具有原料易得,价格低廉,合成简单,易于大规模生产的特点。
2)该材料具有3D交联的碳骨架结构,有利于硫的均匀分布和电荷的持续传输,且碳骨架表面负载的Co0.85Se纳米颗粒可提供丰富的活性位点,可以吸附并催化多硫离子,基于协同增效作用,加速多硫化锂的转化动力学。
3)将其作为硫的功能载体用于锂硫电池后,相关电池展示了优异的循环性能,0.5C(1C=1675 mA g-1)电流密度下,充放电循环260圈后放电比容量维持在770.3 mAh g-1。
附图说明
图1 为本发明实施例1制得3D纳米碳片、ZIF-67@3D碳片前驱体和Co0.85Se纳米颗粒@3D碳网络复合材料的透射电子显微镜或扫描电子显微镜照片(TEM和SEM图)。
图2为本发明实施例1制得Co0.85Se纳米颗粒@3D碳网络复合材料的X射线衍射图(XRD图)。
图3 为本发明实施例2制得3D纳米碳片、ZIF-67@3D碳片前驱体和Co0.85Se纳米颗粒@3D碳网络复合材料的透射电子显微镜或扫描电子显微镜照片(TEM和SEM图)。
图4 为本发明实施例1制得的Co0.85Se纳米颗粒@3D碳网络用作硫载体(硫含量80%),制备的硫/Co0.85Se纳米颗粒@3D碳网络正极材料的循环性能图;其中,左纵坐标是比容量(Specific capacity),右纵坐标是库伦效率(Coulombic efficiency),横坐标是循环圈数(Cycle number)。
具体实施方式
下面通过具体的实施例对本发明的技术方案作进一步的解释和说明。
实施例1
(1)3D 纳米碳骨架的制备
称取20 g柠檬酸钠置于瓷舟中并在N2气氛中于800℃下烧结1h,升温速率每5℃/分钟,煅烧产物经热水洗涤并干燥,得3D 纳米碳片。
(2)小尺寸ZIF-67@3D碳片前驱体的制备
称取0.1 g步骤(1)所得3D纳米碳片置于30 mL含0.015 mol/L硝酸钴的甲醇溶液中,室温下搅拌2h,随后滴加20 mL 含0.18 mol/L 2-甲基咪唑的甲醇溶液,搅拌均匀后静置3h,洗涤并干燥后,获得ZIF-67@3D碳片前驱物。
(3)Co0.85Se纳米颗粒@3D碳网络复合材料的制备
称取0.1 g ZIF-67@3D碳片前驱物与0.08 g 硒粉,将其均匀混合后,置于高温管式炉中通入氩氢混合气(5% H2),以每分钟2℃升温速率升到800℃,并保持4h,自然冷却至室温,获得 Co0.85Se纳米颗粒@3D碳网络复合材料。
(4)硫/Co0.85Se纳米颗粒@3D碳网络正极材料的制备
将硫单质和步骤(3)中所得的硫载体按照质量比8:2混合均匀后, 将所得硫碳混合物放入一个充满氩气的密封容器中,在155℃ 条件下加热12h, 得到锂硫电池正极材料。
实施例2
(1)3D 纳米碳骨架的制备
称取30 g柠檬酸钠置于瓷舟中并在N2气氛中于800℃下烧结1h,升温速率每5℃/分钟,煅烧产物经热水洗涤并干燥,得3D 纳米碳片。
(2)小尺寸ZIF-67@3D碳片前驱体的制备
称取0.1 g步骤(1)所得3D纳米碳片置于30 mL含0.03 mol/L硝酸钴的甲醇溶液中,室温下搅拌2h,随后滴加20 mL 含0.36 mol/L 2-甲基咪唑的甲醇溶液,搅拌均匀后静置3h,洗涤干燥,制备 ZIF-67@3D碳片前驱物。
(3)Co0.85Se纳米颗粒@3D碳网络复合材料的制备
称取0.1 g ZIF-67@3D碳片前驱物与0.1 g 硒粉,将其均匀混合后,置于高温管式炉中通入氩氢混合气(5% H2),以每分钟2℃升温速率升至800℃并保持4h,自然冷却至室温,获得Co0.85Se纳米颗粒@3D碳网络复合材料。
效果实施例1
图1 为本发明实施例1制得3D纳米碳片、ZIF-67@3D碳片前驱体和Co0.85Se纳米颗粒@3D碳网络复合材料的TEM图或SEM 图。从图中可以看出纳米碳片具备3D交联骨架结构和丰富的孔道(图1a),其表面负载的ZIF-67尺寸约100 nm左右(图1b),经过高温煅烧和硒化后,碳骨架表面均匀分布着大量的由ZIF-67衍生的氮掺杂碳包覆Co0.85Se纳米颗粒(图1c和1d)。 图2为Co0.85Se纳米颗粒@3D碳网络复合材料的X射线衍射图(XRD图),由该图可以证明所得CoxSe的物相为Co0.85Se(JCPDS no. 52-1008)。
效果实施例2
图3为本发明实施例2制得3D纳米碳片、ZIF-67@3D碳片前驱体和Co0.85Se纳米颗粒@3D碳网络复合材料的TEM图或SEM 图。可以看将硝酸钴及2-甲基咪唑的浓度增大一倍后,碳片表面负载的ZIF-67明显增多,且其尺寸减小至70 nm左右(图3b),经过高温煅烧和硒化后,碳骨架表面分布着更加丰富的ZIF-67衍生的氮掺杂碳包覆Co0.85Se纳米颗粒。(图3c和3d)。
效果实施例3
将实施例1中制备的硫/Co0.85Se纳米颗粒@3D碳网络正极材料的电化学性能进行测试。
以实施例1制备的硫/Co0.85Se纳米颗粒@3D碳网络复合材料为锂硫电池的正极材料,按如下工艺制作电极,测试其电化学性能,具体步骤如下:
(1)电极的制备:
活性物质(实施例1中制备的硫/Co0.85Se纳米颗粒@3D碳网络正极材料):导电剂和粘结剂以质量比70:20:10的比例混合浆料,导电剂采用乙炔黑和碳纳米管(质量比1:1),粘结剂采用LA-133水系粘结剂(四川茵地乐科技有限公司)。用涂膜器控制一定的厚度均匀地涂覆于铝箔集流体上,置于50℃烘箱中保持12h,然后裁剪成直径为12 mm的电极片。
(2)电池组装及测试:
在充满氩气的手套箱中组装扣式电池(CR2016),锂片为负极,电解液成分为添加了1 mol/L LiTFSI(锂盐)和2 wt% LiNO3的DME/DOL(体积比1:1)混合醚类有机溶液,隔膜为Celgard 2400。组装完毕后,将电池静止12h后利用蓝电测试系统进行电池充放电性能测试,电压窗口为1.7-2.8 V。
结果分析:
图4为Co0.85Se纳米颗粒@3D碳网络/硫正极材料的电化学性能图。从图中可以看出电池具有较高的比容量和良好的循环稳定性。在0.5 C电流密度下,初始比容量为1157.6mAh g-1,且循环260圈后放电比容量维持在770.3 mAh g-1。
Claims (9)
1.一种Co0.85Se纳米颗粒@3D碳网络复合材料的制备方法,其特征在于,包括以下步骤:
(1)3D 纳米碳骨架的制备
将柠檬酸钠置于瓷舟中并在惰性气氛中烧结,洗涤并干燥,得3D 纳米碳片;
(2)小尺寸ZIF-67@3D碳片前驱物的制备
称取3D纳米碳片置于含硝酸钴的甲醇溶液中,搅拌,随后滴加含2-甲基咪唑的甲醇溶液,搅拌均匀后静置,洗涤并干燥,制成小尺寸的ZIF-67@3D碳片前驱物;
(3)Co0.85Se纳米颗粒@3D碳网络复合材料的制备
称取ZIF-67@3D碳片前驱物与硒粉,将其均匀混合后,置于高温管式炉中通入氩氢混合气,高温煅烧,结束后自然冷却至室温,获得 Co0.85Se纳米颗粒@3D碳网络复合材料。
2.根据权利要求1所述的制备方法,其特征在于,步骤(1)中,所述烧结为800~900℃温度下烧结1-3h;所述惰性气氛为N2。
3.根据权利要求1或2所述的制备方法,其特征在于,步骤(2)中,所述含硝酸钴的甲醇溶液浓度为0.015 mol/L~0.03 mol/L;所述3D纳米碳片和硝酸钴溶液的比例为0.1~0.2 g:30 mL。
4.根据权利要求3所述的制备方法,其特征在于,步骤(2)中,所述2-甲基咪唑的甲醇溶液的浓度为0.18 mol/L~0.36 mol/L;所述含硝酸钴的甲醇溶液和2-甲基咪唑的甲醇溶液的体积比为1.5:1。
5.根据权利要求3或4所述的制备方法,其特征在于,步骤(2)中,所述搅拌的温度为20~50℃,搅拌时间为1~3h;所述静置的时间为3~6h。
6.根据权利要求1所述的制备方法,其特征在于,步骤(3)中,所述ZIF-67@3D碳片前驱物和硒粉的质量比为1:0.8~1.2;所述氩氢混合气中含有5%氢气。
7.根据权利要求1或6所述的制备方法,其特征在于,步骤(3)中,所述煅烧为以每分钟2℃升温速率升到800~1000℃,保持2~6h。
8.一种如权利要求1-7所述的制备方法制备得到的Co0.85Se纳米颗粒@3D碳网络复合材料在锂硫电池中作为硫载体的应用。
9.根据权利要求8所述的应用,其特征在于,利用硫载体制备正极材料的方法为:将硫单质和Co0.85Se纳米颗粒@3D碳网络复合材料按照质量比8:2混合均匀后,将所得硫碳混合物放入充满氩气的密封容器中,在155℃ 条件下加热12h, 得到锂硫电池正极材料。
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Inventor after: Nie Hongjiao Inventor after: Mi Kan Inventor after: Zhu Manman Inventor after: Jiang Xiaolei Inventor after: Zheng Xiuwen Inventor before: Mi Kan Inventor before: Nie Hongjiao Inventor before: Zhu Manman Inventor before: Jiang Xiaolei Inventor before: Zheng Xiuwen |