CN115466879A - 一种无钴含钇长寿命贮氢合金粉及其制备方法 - Google Patents
一种无钴含钇长寿命贮氢合金粉及其制备方法 Download PDFInfo
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- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 35
- 239000001257 hydrogen Substances 0.000 title claims abstract description 35
- 239000000843 powder Substances 0.000 title claims abstract description 35
- 238000003860 storage Methods 0.000 title claims abstract description 33
- 229910052727 yttrium Inorganic materials 0.000 title claims abstract description 27
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- 238000002360 preparation method Methods 0.000 title abstract description 7
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- 229910052782 aluminium Inorganic materials 0.000 claims description 8
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种无钴含钇长寿命贮氢合金粉及其制备方法,属于贮氢电池电极材料领域,其化学通式为MNi5‑x‑y‑zMnxA1yQz,其中,M为镧铈稀土元素,Q为Y、Zr单体元素或其混合元素,0.66≤x≤0.71,0.25≤y≤0.30,0.04≤z≤0.08。本发明由于优化了合金成份,有效保证了合金粉的循环使用寿命,具有较高的电化学容量(达到320mAh/g以上)和循环寿命(1.5C测试300次循环后容量保持率为80%以上,超过了IEC规定的标准)。
Description
技术领域
本发明属于贮氢电池电极材料领域,具体涉及一种无钴含钇长寿命贮氢合金粉及其制备方法。
背景技术
在典型的AB5型贮氢合金中,Co含量约占3%~10%(质量),而其成本约占合金原材料总成本的20%~50%,而且国际市场上Co的价格一路攀升,这样就对AB5型贮氢合金的性能、价格比提出了更高的指标。同时,由于锂离子电池迅猛发展,Ni-MH电池受到巨大的冲击和挑战。因此,低估和无钴贮氢合金成为科研工作者关注的课题。而Co对AB5型贮氢合金的循环稳定性具有关键性的作用,如何提高无钴贮氢合金的电化学稳定性,成为AB5型贮氢合金研究的焦点。
人们最关心的是合金的性能价格比,即如何用最低的成本生产出性能最优异的合金。因此了解哪些元素对合金性能有什么影响,如何降低合金成本,就显得十分重要了。试验证明,不同元素替代,主要对贮氢合金的容量,氢化物生成焓,合金的PCT特性,氢在合金中的吸收与扩散过程中的相变和体积膨胀等方面产生影响。
目前开发无钴AB5型贮氢合金是以成熟配方为基础,在一定的理论指导下,结合大量实验数据进行摸索,根据研究者们的研究结果,无钴AB5型贮氢合金发展方向可概括为以下两个方面:(1)非化学计量比,(2)复合无钴贮氢合金。总的来说学术界正广泛地探索着无钴贮氢合金的成分,优化其性能。可以说无钴贮氢合金的放电容量、活化性能、高倍率放电能力问题都得到了解决,但是循环寿命离真正实用阶段还有一定的距离。目前,市场上销售的无钴贮氢合金的300周循环寿命基本在60%-70%之间,循环稳定性较差,而无钴含钇贮氢合金的300周循环寿命相对好些,基本在65%-75%之间,而且钇含量均在2%以上,价格也相对较高,不具备竞争的优势。
发明内容
本发明的目的在于提供一种无钴含钇长寿命贮氢合金粉,以解决现有无钴贮氢合金循环寿命第、价格高昂等技术问题。
为实现上述目的,本发明采用的技术方案如下:
一种无钴含钇长寿命贮氢合金粉,其化学通式为MNi5-x-y-zMnxA1yQz,其中,M为镧铈稀土元素,Q为Y、Zr单体元素或其混合元素,0.66≤x≤0.71,0.25≤y≤0.30,0.04≤z≤0.08。
作为优选地,各元素的质量含量分别为:镍:58~61%、锰:7~9%、铝:1~1.5%、锆:0.1~0.5%、镧:25.0~27.0%、铈:5~7.5%、钇:0.6~1.0%。
上述无钴含钇长寿命贮氢合金粉的制备方法,包括如下步骤:
步骤1,按照配比,准确称量各元素组分;将所称量原料按装炉原则全部装入速凝炉中进行真空熔炼、浇注,冷却后得到所要求的合金薄片;
步骤2,将步骤1的合金薄片装入退火炉进行退火,通过合适的退火温度和保温时间,将该种贮氢合金均质化;
步骤3,将步骤2退火后所制的合金,通过研磨设备,制成200目以下的合金粉。
更进一步地,组分La、Ce、Ni、Mn、Al、Y、Zr的纯度均大于99%。
更进一步地,步骤2中,退火温度1000~1040℃,保温时间4~10小时。
与现有技术相比,本发明具有以下有益效果:
1、本发明由于优化了合金成份,有效保证了合金粉的循环使用寿命,具有较高的电化学容量(达到320mAh/g以上)和循环寿命(1.5C测试300次循环后容量保持率为80%以上,超过了IEC规定的标准);
2、本发明制备的合金,由于Y、Zr的加入,使合金在晶界产生第二相,抑制合金晶体吸放氢过程中的晶格膨胀,并能提高合金的抗氧化性能,防止粉化和氧化,在抗氧化、耐腐蚀性能上有不俗的表现;此外,本发明制备的合金粉具有合适的氢平衡分解压力;
3、本发明合金粉的原材料价格合适,制备过程简单,成本较低,具有强大的市场竞争优势。
附图说明
图1为该合金粉XRD晶体结构;
图2为该合金粉PCT测试图谱;
图3为该类型合金粉电化学容量测试图;
图4为该类型合金粉循环使用寿命测试图。
具体实施方式
下面结合附图以及各实施例对本发明作进一步说明,本发明的方式包括但不仅限于以下实施例。
本发明通过理论值推算,引入Y元素替代Co,从而达到改善循环寿命的效果,调整其他元素添加量,得到以下元素配比:镍:58~61%、锰:7~9%、铝:1~2%、锆:0.1~0.5%、镧:25.0~27.0%、铈:5~7.5%、钇:0.6~1.0%。
其制备过程有以下步骤:
步骤1,按照配比,准确称量各元素组分;将所称量原料按装炉原则全部装入速凝炉中进行真空熔炼、浇注,冷却后得到所要求的合金薄片;
原料要求:熔炼合金所使用的金属La、Ce、Ni、Mn、Al、Y、Zr的纯度大于99%,合金样品按设计成分配料,并考虑一定的烧损率;
熔炼过程:真空感应铸片炉熔炼,每炉装炉量控制在额定装炉量以内,根究配方设计,浇铸温度1380~1450℃之间。
步骤2,将步骤1的合金薄片装入退火炉进行退火,通过合适的退火温度和保温时间,将该种贮氢合金均质化,退火温度1000~1040℃,保温时间4~10小时;
步骤3,将步骤2退火后所制的合金,通过研磨设备(利用冲击磨、气流磨进行制粉,筛分机对冲击磨和气流磨的筛中物进行筛分、得到的筛下物进入混料机进行混料,混料按照拍击法(-200目):-200目≥98%,54%≤-400目≤58%;拍击法(-150目):-150目≥98%,24%≤-400目≤28%的标准选择合适的筛网和拍击筛进行拍击配料,以符合条件要求),制成200目以下的合金粉。
对制备的合金进行性能检测:所得合金粉取100g,利用LAND电池测试系统、PCT测试系统等对其电化学性能进行分析检测,具体如下:
1.容量测试:合金粉:羰基镍粉=1:3(200±0.2mg:600±0.2mg);压片机压力20MPa,压片保压时间45~60s;电解液浓度6±0.05mol/L KOH溶液。容量检测充放电制度:充放电电流200mA/g,充电时间2h,充电后搁置时间5min,放电截止电压1V,放电后搁置时间5min,充放电循环次数10~20次;
2.循环寿命测试:合金粉:羰基镍粉=1:3(200±0.2mg:600±0.2mg);压片机压力20MPa,压片保压时间45~60s;电解液浓度6±0.05mol/L KOH溶液。充放电电流50mA/g,充电时间8h,充电后搁置时间5min,放电截止电压1V,放电后搁置时间5min,充放电循环次数5次。然后充放电电流480mA/g,充电时间50min,充电后搁置时间5min,放电截止电压1V,放电后搁置时间5min,充放电循环次数300~500次。
实施例1
本实施例各组分元素质量百分比为:镍58%、锰7.3%、铝1.0%、锆0.2%、镧25%、铈7.5%、钇1.0%,按照上述步骤制备合金粉。制得的的合金粉XRD晶体结构、PCT测试图谱分别如图1、图2所示,并进行容量、循环寿命测试,容量测试图如图3,循环寿命测试图如图4。
实施例2
本实施例各组分元素质量百分比为:镍58.5%、锰7%、铝1.0%、锆0.2%、镧26%、铈6.5%、钇0.8%,按照上述步骤制备合金粉,并进行容量、循环寿命测试。
实施例3
本实施例各组分元素质量百分比为:镍59%、锰7%、铝1.0%、锆0.4%、镧27%、铈5.0%、钇0.6%,按照上述步骤制备合金粉,并进行容量、循环寿命测试。
对比例1
本对比例各组分元素质量百分比为:镍61.5%、锰4%、铝1.0%、镧20%、铈10.5%、钇3.0%,按照上述步骤制备合金粉,并进行容量、循环寿命测试。
对比例2
本对比例各组分元素质量百分比为:镍60%、锰4%、镧22%、铈10.5%、钇3.5%,按照上述步骤制备合金粉,并进行容量、循环寿命测试。
对比例3
本对比例各组分元素质量百分比为:镍62%、铝3.0%、镧21%、铈11%、钇3.0%,按照上述步骤制备合金粉,并进行容量、循环寿命测试。
实施例1~3与对比例1~3容量、循环寿命测试数据如表1:
表1各组合金粉的容量、循环寿命测试数据
从表1可以看出,采用本发明所制成的贮氢合金材料,在0.7C放电的前提下,最大放电比容量最高达到了324.1mAh/g;1.5C循环300周的寿命更是最高达到了85%,而用对比例1-3制备的贮氢合金1.5C循环300周寿命均在75%以下。因此,本发明能大幅度提高无钴贮氢合金的循环寿命。本发明制成的贮氢合金材料在1000~1040℃,经过一段时间退火后,其电化学容量和循环寿命均达到了设计指标要求。
上述实施例仅为本发明的优选实施方式之一,不应当用于限制本发明的保护范围,但凡在本发明的主体设计思想和精神上作出的毫无实质意义的改动或润色,其所解决的技术问题仍然与本发明一致的,均应当包含在本发明的保护范围之内。
Claims (5)
1.一种无钴含钇长寿命贮氢合金粉,其特征在于,其化学通式为MNi5-x-y-zMnxA1yQz,其中,M为镧铈稀土元素,Q为Y、Zr单体元素或其混合元素,0.66≤x≤0.71,0.25≤y≤0.30,0.04≤z≤0.08。
2.如权利要求1所述无钴含钇长寿命贮氢合金粉,其特征在于,各元素的质量含量分别为:镍:58~61%、锰:7~9%、铝:1~1.5%、锆:0.1~0.5%、镧:25.0~27.0%、铈:5~7.5%、钇:0.6~1.0%。
3.一种如权利要求1或2所述的无钴含钇长寿命贮氢合金粉的制备方法,其特征在于,包括如下步骤:
步骤1,按照配比,准确称量各元素组分;将所称量原料按装炉原则全部装入速凝炉中进行真空熔炼、浇注,冷却后得到所要求的合金薄片;
步骤2,将步骤1的合金薄片装入退火炉进行退火,通过合适的退火温度和保温时间,将该种贮氢合金均质化;
步骤3,将步骤2退火后所制的合金,通过研磨设备,制成200目以下的合金粉。
4.如权利要求3所述的制备方法,其特征在于,组分La、Ce、Ni、Mn、Al、Y、Zr的纯度均大于99%。
5.如权利要求3所述的制备方法,其特征在于,步骤2中,退火温度1000~1040℃,保温时间4~10小时。
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