CN116230902A - 一种动力电池负极材料及其制备方法 - Google Patents
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- 238000002360 preparation method Methods 0.000 title description 8
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 16
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- 229910052787 antimony Inorganic materials 0.000 claims abstract description 16
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims abstract description 16
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- 239000004917 carbon fiber Substances 0.000 claims abstract description 16
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- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 150000002641 lithium Chemical class 0.000 claims abstract description 16
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- 229920000642 polymer Polymers 0.000 claims description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
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- 229920002239 polyacrylonitrile Polymers 0.000 claims description 3
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- 239000010405 anode material Substances 0.000 abstract description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 230000001351 cycling effect Effects 0.000 abstract description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 8
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- 238000001132 ultrasonic dispersion Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002001 electrolyte material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 239000007774 positive electrode material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Abstract
本发明公开了一种动力电池负极材料,所述动力电池包括有正极材料、负极材料、电解液、隔膜、辅剂和包覆材料,所述负极材料为锡基合金、硅基合金、锗基合金、锑基合金、镁基合金、氮化合物、改性锂粉、改性石墨、碳纤维、热解树脂碳构成的混合物。本发明的负极材料合负极材料导电性能大大提升,初始容量以及循环稳定性显著提高,弥补了钛酸锂导电性不佳以及大电流充放电时容量衰减严重的问题,同也有利于形成导电通路,安全性更高。
Description
技术领域
本发明涉及电池技术领域,尤其是一种动力电池负极材料及其制备方法。
背景技术
锂离子电池所用电解质材料的不同,锂离子电池分为液态锂离子电池
(Liquified Lithium-Ion Battery,简称为LIB)和聚合物锂离子电池(PolymerLithium-Ion Battery,简称为PLB)。锂离子电池,可充电锂离子电池是手机、笔记本电脑等现代数码产品中应用最广泛的电池,但它较为“娇气”,在使用中不可过充、过放(会损坏电池或使之报废)。因此,在电池上有保护元器件或保护电路以防止昂贵的电池损坏。锂离子电池充电要求很高,要保证终止电压精度在±1%之内,各大半导体器件厂已开发出多种锂离子电池充电的IC,以保证安全、可靠、快速地充电。
现有的动力电池其导电性不高、大电流充放电时容量衰减严重,通常采用表面改性或掺杂来提高其导电性能,且负极材料比容量较低,安全性差,循环性能仍有待提高,针对以上的问题,在这里我们提出一种动力电池负极材料及其制备方法。
发明内容
本发明针对背景技术中现有的动力电池其导电性不高、大电流充放电时容量衰减严重,通常采用表面改性或掺杂来提高其导电性能,且负极材料比容量较低,安全性差,循环性能仍有待提高的不足,提供了一种动力电池负极材料及其制备方法。
本发明为解决上述技术不足,采用改性的技术方案,一种动力电池负极材料及其制备方法,所述动力电池包括有正极材料、负极材料、电解液、隔膜、辅剂和包覆材料,所述负极材料为锡基合金、硅基合金、锗基合金、锑基合金、镁基合金、氮化合物、改性锂粉、改性石墨、碳纤维、热解树脂碳构成的混合物。
作为本发明的进一步优选方式,所述负极材料的成分配比为锡基合金2-8份,硅基合金6-10份,锑基合金8-12份,锗基合金5-8份、镁基合金3-6份、氮化合物2-4份、改性锂粉15-40份、改性石墨4-10份、碳纤维1-4份、热解树脂碳3-10份。
作为本发明的进一步优选方式,还包括有,所述负极材料的成分配比为锡基合金8份,硅基合金10份,锑基合金12份,锗基合金8份、镁基合金6份、氮化合物4份、改性锂粉40份、改性石墨10份、碳纤维4份、热解树脂碳10份。
作为本发明的进一步优选方式,具体制作步骤包括有以下步骤,
S1,将按照份量比的材料锡基合金,硅基合金份,锑基合金,锗基合金、镁基合金,加入到过渡金属盐水溶液中,在80℃下浸渍2h,继续升温至100℃至溶剂蒸干后得掺杂过渡金属元素的材料;
S2,将上述的原料中加入改性锂粉水溶液中混合,在80℃下浸渍2h,继续升温至100℃至溶剂蒸干后得掺杂过渡金属元素的材料;
S3,将上述的原料与改性石墨、碳纤维、热解树脂碳进行混合,融合均匀后,将所得混合物在保护气氛下于500-850℃煅烧,保温时间为8-10h,冷却至室温,制得负极材料。
作为本发明的进一步优选方式,所述改性石墨,将石墨原料首先经过粉碎,球化,分级,沥青或聚合物包裹后,再次石墨化制得球状石墨材料,再加入纳米级人工石墨;粉碎,球化,分级后的重量占总重量的55-68wt%,其中位径为4-8μm,球形度≥0.80,然后将其送入真空密封罐中,通过注入氮气,设置3个常规大气压,然后进行热处理,温度保持在180-240℃,热处理后,冷却,静置2h即完成改性。
作为本发明的进一步优选方式,所述锂材料的改性包括以下方法,首先将锂材料在硝酸溶液中进行热回流,于70-90℃下,加热回流12-24h,并伴随着间歇式搅拌,加热搅拌的温度为50-80℃,时间为5-10h,再进行超声分散到溶剂中,然后进行真空干燥12-24h。
作为本发明的进一步优选方式,所述负极材料的包覆材料选自煤沥青、石油沥青、纺丝沥青、环氧树脂、酚醛树脂、聚丙烯腈、聚乙烯醇、聚苯乙烯、煤焦油中的一种,所述包覆材料包裹后,浸泡在清洗溶液中,浸泡时间控制15-30min,然后取出热处理,封边再进行抛光打磨处理。
作为本发明的进一步优选方式,步骤S2中,在混合过程中,采用电动搅拌处理,搅拌的转速控制在400-750r/min之间。
本发明所达到的有益效果是:本发明的负极材料合负极材料导电性能大大提升,初始容量以及循环稳定性显著提高,弥补了钛酸锂导电性不佳以及大电流充放电时容量衰减严重的问题,同也有利于形成导电通路,安全性更高。
具体实施方式
下面将结合本发明实施例中,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
本发明提供一种技术方案:一种动力电池负极材料及其制备方法,动力电池包括有正极材料、负极材料、电解液、隔膜、辅剂和包覆材料,负极材料为锡基合金、硅基合金、锗基合金、锑基合金、镁基合金、氮化合物、改性锂粉、改性石墨、碳纤维、热解树脂碳构成的混合物。
负极材料的成分配比为锡基合金2-8份,硅基合金6-10份,锑基合金8-12份,锗基合金5-8份、镁基合金3-6份、氮化合物2-4份、改性锂粉15-40份、改性石墨4-10份、碳纤维1-4份、热解树脂碳3-10份。
还包括有,负极材料的成分配比为锡基合金8份,硅基合金10份,锑基合金12份,锗基合金8份、镁基合金6份、氮化合物4份、改性锂粉40份、改性石墨10份、碳纤维4份、热解树脂碳10份。
具体制作步骤包括有以下步骤,
S1,将按照份量比的材料锡基合金,硅基合金份,锑基合金,锗基合金、镁基合金,加入到过渡金属盐水溶液中,在80℃下浸渍2h,继续升温至100℃至溶剂蒸干后得掺杂过渡金属元素的材料;
S2,将上述的原料中加入改性锂粉水溶液中混合,在80℃下浸渍2h,继续升温至100℃至溶剂蒸干后得掺杂过渡金属元素的材料;
S3,将上述的原料与改性石墨、碳纤维、热解树脂碳进行混合,融合均匀后,将所得混合物在保护气氛下于500-850℃煅烧,保温时间为8-10h,冷却至室温,制得负极材料。
改性石墨,将石墨原料首先经过粉碎,球化,分级,沥青或聚合物包裹后,再次石墨化制得球状石墨材料,再加入纳米级人工石墨;粉碎,球化,分级后的重量占总重量的55-68wt%,其中位径为4-8μm,球形度≥0.80,然后将其送入真空密封罐中,通过注入氮气,设置3个常规大气压,然后进行热处理,温度保持在180-240℃,热处理后,冷却,静置2h即完成改性。
锂材料的改性包括以下方法,首先将锂材料在硝酸溶液中进行热回流,于70-90℃下,加热回流12-24h,并伴随着间歇式搅拌,加热搅拌的温度为50-80℃,时间为5-10h,再进行超声分散到溶剂中,然后进行真空干燥12-24h。
负极材料的包覆材料选自煤沥青、石油沥青、纺丝沥青、环氧树脂、酚醛树脂、聚丙烯腈、聚乙烯醇、聚苯乙烯、煤焦油中的一种,包覆材料包裹后,浸泡在清洗溶液中,浸泡时间控制15-30min,然后取出热处理,封边再进行抛光打磨处理。
步骤S2中,在混合过程中,采用电动搅拌处理,搅拌的转速控制在400-750r/min之间。
实施例一
负极材料的成分配比为锡基合金8份,硅基合金10份,锑基合金12份,锗基合金8份、镁基合金6份、氮化合物4份、改性锂粉40份、改性石墨10份、碳纤维4份、热解树脂碳10份;
改性石墨,将石墨原料首先经过粉碎,球化,分级,沥青或聚合物包裹后,再次石墨化制得球状石墨材料,再加入纳米级人工石墨;粉碎,球化,分级后的重量占总重量的68wt%,其中位径为8μm,球形度≥0.80,然后将其送入真空密封罐中,通过注入氮气,设置3个常规大气压,然后进行热处理,温度保持在240℃,热处理后,冷却,静置2h即完成改性。
锂材料的改性包括以下方法,首先将锂材料在硝酸溶液中进行热回流,于90℃下,加热回流24h,并伴随着间歇式搅拌,加热搅拌的温度为80℃,时间为10h,再进行超声分散到溶剂中,然后进行真空干燥24h;
具体制作步骤包括有以下步骤,将按照份量比的材料锡基合金,硅基合金份,锑基合金,锗基合金、镁基合金,加入到过渡金属盐水溶液中,在80℃下浸渍2h,继续升温至100℃至溶剂蒸干后得掺杂过渡金属元素的材料;将上述的原料中加入改性锂粉水溶液中混合,在80℃下浸渍2h,继续升温至100℃至溶剂蒸干后得掺杂过渡金属元素的材料;将上述的原料与改性石墨、碳纤维、热解树脂碳进行混合,融合均匀后,将所得混合物在保护气氛下于850℃煅烧,保温时间为10h,冷却至室温,制得负极材料。
实施例二
负极材料的成分配比为锡基合金2份,硅基合金6份,锑基合金8份,锗基合金5份、镁基合金3份、氮化合物2份、改性锂粉15份、改性石墨4份、碳纤维1份、热解树脂碳3份;
改性石墨,将石墨原料首先经过粉碎,球化,分级,沥青或聚合物包裹后,再次石墨化制得球状石墨材料,再加入纳米级人工石墨;粉碎,球化,分级后的重量占总重量的55wt%,其中位径为4μm,球形度≥0.80,然后将其送入真空密封罐中,通过注入氮气,设置3个常规大气压,然后进行热处理,温度保持在180℃,热处理后,冷却,静置2h即完成改性。
锂材料的改性包括以下方法,首先将锂材料在硝酸溶液中进行热回流,于70℃下,加热回流12-24h,并伴随着间歇式搅拌,加热搅拌的温度为50℃,时间为5h,再进行超声分散到溶剂中,然后进行真空干燥12h;
具体制作步骤包括有以下步骤,将按照份量比的材料锡基合金,硅基合金份,锑基合金,锗基合金、镁基合金,加入到过渡金属盐水溶液中,在80℃下浸渍2h,继续升温至100℃至溶剂蒸干后得掺杂过渡金属元素的材料;将上述的原料中加入改性锂粉水溶液中混合,在80℃下浸渍2h,继续升温至100℃至溶剂蒸干后得掺杂过渡金属元素的材料;将上述的原料与改性石墨、碳纤维、热解树脂碳进行混合,融合均匀后,将所得混合物在保护气氛下于500℃煅烧,保温时间为8h,冷却至室温,制得负极材料。
以上显示和描述了本发明的基本原理和主要特征和本发明的优点,对于本领域技术人员而言,显然本发明不限于上述示范性实施例的细节,而且在不背离本发明的精神或基本特征的情况下,能够以其他的具体形式实现本发明。因此,无论从哪一点来看,均应将实施例看作是示范性的,而且是非限制性的,本发明的范围由所附权利要求而不是上述说明限定,因此旨在将落在权利要求的等同要件的含义和范围内的所有变化囊括在本发明内。
此外,应当理解,虽然本说明书按照实施方式加以描述,但并非每个实施方式仅包含一个独立的技术方案,说明书的这种叙述方式仅仅是为清楚起见,本领域技术人员应当将说明书作为一个整体,各实施例中的技术方案也可以经适当组合,形成本领域技术人员可以理解的其他实施方式。
Claims (8)
1.一种动力电池负极材料,其特征在于,所述动力电池包括有正极材料、负极材料、电解液、隔膜、辅剂和包覆材料,所述负极材料为锡基合金、硅基合金、锗基合金、锑基合金、镁基合金、氮化合物、改性锂粉、改性石墨、碳纤维、热解树脂碳构成的混合物。
2.根据权利要求1所述的一种动力电池负极材料,其特征在于,所述负极材料的成分配比为锡基合金2-8份,硅基合金6-10份,锑基合金8-12份,锗基合金5-8份、镁基合金3-6份、氮化合物2-4份、改性锂粉15-40份、改性石墨4-10份、碳纤维1-4份、热解树脂碳3-10份。
3.根据权利要求1所述的一种动力电池负极材料,其特征在于,还包括有,所述负极材料的成分配比为锡基合金8份,硅基合金10份,锑基合金12份,锗基合金8份、镁基合金6份、氮化合物4份、改性锂粉40份、改性石墨10份、碳纤维4份、热解树脂碳10份。
4.根据权利要求1所述的一种动力电池负极材料,其特征在于,具体制作步骤包括有以下步骤,
S1,将按照份量比的材料锡基合金,硅基合金份,锑基合金,锗基合金、镁基合金,加入到过渡金属盐水溶液中,在80℃下浸渍2h,继续升温至100℃至溶剂蒸干后得掺杂过渡金属元素的材料;
S2,将上述的原料中加入改性锂粉水溶液中混合,在80℃下浸渍2h,继续升温至100℃至溶剂蒸干后得掺杂过渡金属元素的材料;
S3,将上述的原料与改性石墨、碳纤维、热解树脂碳进行混合,融合均匀后,将所得混合物在保护气氛下于500-850℃煅烧,保温时间为8-10h,冷却至室温,制得负极材料。
5.根据权利要求1所述的一种动力电池负极材料的制备方法,其特征在于,所述改性石墨,将石墨原料首先经过粉碎,球化,分级,沥青或聚合物包裹后,再次石墨化制得球状石墨材料,再加入纳米级人工石墨;粉碎,球化,分级后的重量占总重量的55-68wt%,其中位径为4-8μm,球形度≥0.80,然后将其送入真空密封罐中,通过注入氮气,设置3个常规大气压,然后进行热处理,温度保持在180-240℃,热处理后,冷却,静置2h即完成改性。
6.根据权利要求1所述的一种动力电池负极材料,其特征在于,所述锂材料的改性包括以下方法,首先将锂材料在硝酸溶液中进行热回流,于70-90℃下,加热回流12-24h,并伴随着间歇式搅拌,加热搅拌的温度为50-80℃,时间为5-10h,再进行超声分散到溶剂中,然后进行真空干燥12-24h。
7.根据权利要求1所述的一种动力电池负极材料,其特征在于,所述负极材料的包覆材料选自煤沥青、石油沥青、纺丝沥青、环氧树脂、酚醛树脂、聚丙烯腈、聚乙烯醇、聚苯乙烯、煤焦油中的一种,所述包覆材料包裹后,浸泡在清洗溶液中,浸泡时间控制15-30min,然后取出热处理,封边再进行抛光打磨处理。
8.根据权利要求4所述的一种动力电池负极材料的制备方法,其特征在于,步骤S2中,在混合过程中,采用电动搅拌处理,搅拌的转速控制在400-750r/min之间。
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