CN112626606A - 一种纯固相法制备高镍四元单晶正极材料的方法 - Google Patents
一种纯固相法制备高镍四元单晶正极材料的方法 Download PDFInfo
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- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000010532 solid phase synthesis reaction Methods 0.000 title claims abstract description 24
- 239000010406 cathode material Substances 0.000 title claims abstract description 15
- 238000005245 sintering Methods 0.000 claims abstract description 34
- 239000013078 crystal Substances 0.000 claims abstract description 18
- 239000007774 positive electrode material Substances 0.000 claims abstract description 16
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000000498 ball milling Methods 0.000 claims abstract description 11
- 238000007580 dry-mixing Methods 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 8
- 239000011572 manganese Substances 0.000 claims abstract description 8
- 238000005303 weighing Methods 0.000 claims abstract description 7
- 239000010405 anode material Substances 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 4
- 239000010941 cobalt Substances 0.000 claims abstract description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 4
- 150000001875 compounds Chemical class 0.000 claims abstract description 4
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 239000000126 substance Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 17
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 15
- 238000007873 sieving Methods 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 claims description 6
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 6
- GNMQOUGYKPVJRR-UHFFFAOYSA-N nickel(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ni+3].[Ni+3] GNMQOUGYKPVJRR-UHFFFAOYSA-N 0.000 claims description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- IUYLTEAJCNAMJK-UHFFFAOYSA-N cobalt(2+);oxygen(2-) Chemical compound [O-2].[Co+2] IUYLTEAJCNAMJK-UHFFFAOYSA-N 0.000 claims description 4
- 229910019125 CoaMnb Inorganic materials 0.000 claims description 3
- 229910021503 Cobalt(II) hydroxide Inorganic materials 0.000 claims description 3
- 229910021446 cobalt carbonate Inorganic materials 0.000 claims description 3
- ZOTKGJBKKKVBJZ-UHFFFAOYSA-L cobalt(2+);carbonate Chemical compound [Co+2].[O-]C([O-])=O ZOTKGJBKKKVBJZ-UHFFFAOYSA-L 0.000 claims description 3
- ASKVAEGIVYSGNY-UHFFFAOYSA-L cobalt(ii) hydroxide Chemical compound [OH-].[OH-].[Co+2] ASKVAEGIVYSGNY-UHFFFAOYSA-L 0.000 claims description 3
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 3
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 3
- 229910000008 nickel(II) carbonate Inorganic materials 0.000 claims description 3
- ZULUUIKRFGGGTL-UHFFFAOYSA-L nickel(ii) carbonate Chemical compound [Ni+2].[O-]C([O-])=O ZULUUIKRFGGGTL-UHFFFAOYSA-L 0.000 claims description 3
- BFDHFSHZJLFAMC-UHFFFAOYSA-L nickel(ii) hydroxide Chemical compound [OH-].[OH-].[Ni+2] BFDHFSHZJLFAMC-UHFFFAOYSA-L 0.000 claims description 3
- 150000001869 cobalt compounds Chemical class 0.000 claims description 2
- 229910000428 cobalt oxide Inorganic materials 0.000 claims description 2
- 150000002642 lithium compounds Chemical class 0.000 claims description 2
- 229940093474 manganese carbonate Drugs 0.000 claims description 2
- 235000006748 manganese carbonate Nutrition 0.000 claims description 2
- 239000011656 manganese carbonate Substances 0.000 claims description 2
- IPJKJLXEVHOKSE-UHFFFAOYSA-L manganese dihydroxide Chemical compound [OH-].[OH-].[Mn+2] IPJKJLXEVHOKSE-UHFFFAOYSA-L 0.000 claims description 2
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 claims description 2
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 claims description 2
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 2
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 2
- 150000002697 manganese compounds Chemical class 0.000 claims 1
- TYTHZVVGVFAQHF-UHFFFAOYSA-N manganese(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Mn+3].[Mn+3] TYTHZVVGVFAQHF-UHFFFAOYSA-N 0.000 claims 1
- GEYXPJBPASPPLI-UHFFFAOYSA-N manganese(III) oxide Inorganic materials O=[Mn]O[Mn]=O GEYXPJBPASPPLI-UHFFFAOYSA-N 0.000 claims 1
- 150000002816 nickel compounds Chemical class 0.000 claims 1
- 238000002156 mixing Methods 0.000 abstract description 4
- 239000002243 precursor Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
- 230000008901 benefit Effects 0.000 description 6
- 229910013467 LiNixCoyMnzO2 Inorganic materials 0.000 description 5
- 229910013410 LiNixCoyAlzO2 Inorganic materials 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 150000001868 cobalt Chemical class 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 150000002696 manganese Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000002815 nickel Chemical class 0.000 description 2
- UPWOEMHINGJHOB-UHFFFAOYSA-N oxo(oxocobaltiooxy)cobalt Chemical compound O=[Co]O[Co]=O UPWOEMHINGJHOB-UHFFFAOYSA-N 0.000 description 2
- 238000003746 solid phase reaction Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910013716 LiNi Inorganic materials 0.000 description 1
- 229910017016 Ni0.8Co0.15 Inorganic materials 0.000 description 1
- 229910017223 Ni0.8Co0.1Mn0.1(OH)2 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B1/00—Single-crystal growth directly from the solid state
- C30B1/10—Single-crystal growth directly from the solid state by solid state reactions or multi-phase diffusion
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/16—Oxides
- C30B29/22—Complex oxides
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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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- H—ELECTRICITY
- 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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
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Abstract
本发明公开了一种纯固相法制备高镍四元单晶正极材料的方法,将锂、镍、钴、锰的化合物及铝粉按照化学式Lix(Ni1‑a‑b‑cCoaMnbAlc)O2的摩尔比x:(1‑a‑b‑c):a:b:c称取相应的原料,其中0.9≤x≤1.2,0.6≤1‑a‑b‑c≤0.97,0.01≤a≤0.2,0.01≤b≤0.2,0.01≤c≤0.1;将原料放入球磨瓶内,加入氧化锆球进行干法混合研磨,再进行高温烧结、粉碎,得到高镍四元单晶正极材料。本发明采用干法混磨,混料效率高、混合效果好;采用固相合成法,工艺过程简单、成本低、易于工业化生产,减少湿法制备前驱体的复杂流程,降低对环境的危害,提高生产效率。本发明的高镍四元正极材料结构稳定,安全性能高,且循环寿命长、热稳定性好。
Description
技术领域:
本发明属于锂离子电池技术领域,尤其涉及到一种纯固相法制备电化学性能优良的高镍四元单晶正极材料的方法。
背景技术:
随着国家对新能源汽车政策补贴退坡、国际竞争加剧及新能源汽车续航里程要求不断提高,国内外锂电企业正在向高镍三元材料领域积极布局。高能量密度的高镍三元材料LiNixCoyAlzO2和LiNixCoyMnzO2(X≥0.8)是实现国家政策要求比能量的最佳材料,两种高镍材料的能量密度高、成本低,但是存在对水分比较敏感、稳定性和循环性差、技术门槛高等问题。另外,以上两种常规高镍三元正极材料以团聚体的形式存在,其压实密度偏低、高压实下易破碎和副反应加剧、高电压充放电过程中易发生结构坍塌,造成电化学性能下降,因此,能够将LiNixCoyAlzO2和LiNixCoyMnzO2两者优势结合在一起,并克服两种材料的劣势,是我们亟需解决的问题。
发明内容:
为解决上述问题,本专利提出一种纯固相法制备高镍四元单晶正极材料的方法,充分结合了LiNixCoyAlzO2和LiNixCoyMnzO2两者的优势,发挥了高镍单晶正极材料高比容量、高压实、长循环稳定性、高安全性等优点,克服了常规高镍三元正极材料存在的问题。
为了实现上述目的,本发明的技术方案是:
一种纯固相法制备高镍四元单晶正极材料的方法,其特征在于将锂、镍、钴、锰的化合物及铝金属粉末按照化学式Lix(Ni1-a-b-cCoaMnbAlc)O2的摩尔比称取相应原料,其中0.9≤x≤1.2,0.6≤1-a-b-c≤0.97,0.01≤a≤0.2,0.01≤b≤0.2,0.01≤c≤0.1。
在一个或多个实施例中的一种纯固相法制备高镍四元单晶正极材料的方法,其步骤为:
(1)Lix(Ni1-a-b-cCoaMnbAlc)O2的合成
按照Li:Ni:Co:Mn:Al=x:1-a-b-c:a:b:c的摩尔比称取锂盐、镍盐、钴盐、锰盐及铝金属粉末,置于球磨瓶内,再加入氧化锆球进行干法混合研磨,球磨时间1~4小时,并在高温和氧气气氛下烧结,烧结分为两段温度烧结,首先是在400~600℃的空气气氛烧结4~12小时,烧结完毕后,破碎过400目筛,然后在700~900℃纯氧气氛中烧结10~40小时,冷却、破碎过400目筛,即得到高镍四元单晶正极材料。
所述0.9≤x≤1.2,0.6≤1-a-b-c≤0.97,0.01≤a≤0.2,0.01≤b≤0.2,0.01≤c≤0.1
在一个或多个实施例中,所述锂的化合物为氢氧化锂、碳酸锂、氟化锂中的任意一种;
在一个或多个实施例中,所述钴的化合物为氢氧化钴、碳酸钴、氧化钴、三氧化二钴、氧化亚钴中的任意一种;在一个或多个实施例中,所述镍的化合物为氢氧化镍、碳酸镍、氧化镍、三氧化二镍中的任意一种;在一个或多个实施例中,所述铝粉为铝金属粉末。
本发明的主要有益效果:
一是采用高温固相合成法,该方法工艺过程简单、成本低、易于工业化生产,减少湿法制备前驱体的复杂流程,降低对环境的危害,提高生产效率;二是制备的高镍四元单晶正极材料综合了LiNixCoyAlzO2和LiNixCoyMnzO2的优点,提高了高镍四元单晶正极材料的结构稳定性、安全性、热稳定性和电性能,可在社会上产生良好的经济效益。
附图说明:
附图用来提供对本发明的进一步理解,并且构成说明书的一部分,与本发明的实施例一起用于解释本发明。在附图中:
图1是本发明一实施例中一种纯固相法制备高镍四元单晶正极材料的方法的示意图。
具体实施方式:
本发明提出一种纯固相法制备高镍四元单晶正极材料的方法,通过以下具体实例对本发明作进一步详细阐明。
实施例一:
一种纯固相法制备高镍四元单晶正极材料的方法,包括以下步骤:
称取38.8g碳酸锂、95g碳酸镍、17.8g碳酸钴、2.3g碳酸锰和0.8g铝粉,置于球磨瓶内,再加入氧化锆球进行干法混合研磨,球磨时间3.5小时,并在高温和氧气气氛下烧结,烧结分为两段温度烧结,首先是在500℃的空气气氛烧结10小时,烧结完毕后,破碎过400目筛,然后在800℃纯氧气氛中烧结20小时,冷却、破碎过400目筛,即得到高镍四元单晶正极材料。
实施例二:
一种纯固相法制备高镍四元单晶正极材料的方法,包括以下步骤:
称取43.1g氢氧化锂、74.2g氢氧化镍、13.9g氢氧化钴、2.7g氢氧化锰和0.8g铝粉,置于球磨瓶内,再加入氧化锆球进行干法混合研磨,球磨时间2.5小时,并在高温和氧气气氛下烧结,烧结分为两段温度烧结,首先是在450℃的空气气氛烧结8小时,烧结完毕后,破碎过400目筛,然后在780℃纯氧气氛中烧结18小时,冷却、破碎过400目筛,即得到高镍四元单晶正极材料。
实施例三:
一种纯固相法制备高镍四元单晶正极材料的方法,包括以下步骤:
称取27.2g氟化锂、66.2g三氧化二镍、12.4g三氧化二钴、1.7g氧化锰和0.8g铝粉,置于球磨瓶内,再加入氧化锆球进行干法混合研磨,球磨时间3小时,并在高温和氧气气氛下烧结,烧结分为两段温度烧结,首先是在550℃的空气气氛烧结12小时,烧结完毕后,破碎过400目筛,然后在850℃纯氧气氛中烧结20小时,冷却、破碎过400目筛,即得到高镍四元单晶正极材料。
对比例一:
将氢氧化锂和Ni0.8Co0.15Mn0.05(OH)2的前驱体按n(Li):n(Ni+Co+Mn)=1.05:1混合并球磨,以1000r/min转速球磨2小时后,将粉体取出过150目筛,并在马弗炉中进行两步烧结:第一步为预烧阶段,在空气中从室温升至560℃,保温8小时;第二步为固相反应阶段,在氧气氛围中升温至750℃,保温12小时,随炉冷却至室温,经破碎、过400目筛后即得到常规镍钴锰三元材料Li(Ni0.8Co0.15Al0.05)O2。
对比例二:
将氢氧化锂和Ni0.8Co0.1Mn0.1(OH)2的前驱体按n(Li):n(Ni+Co+Mn)=1.05:1混合并球磨,以1000r/min转速球磨2.5小时后,将粉体取出过150目筛,并在马弗炉中进行两步烧结:第一步为预烧阶段,在空气中从室温升至500℃,保温8小时;第二步为固相反应阶段,在氧气氛围中升温至780℃,保温10小时,随炉冷却至室温,经破碎、过400目筛后即得到常规镍钴锰三元材料Li(Ni0.8Co0.1Mn0.1)O2。
对上述实施例及对比例样品进行2025扣电制作,在室温下进行电化学性能测试,测试电压条件为3.0-4.3V,依次进行0.1C,0.5C,1C,2C充放电测试。倍率性能计算方法:2C放电容量/0.1C放电容量。
表一:实施例1~3和对比例1~2样品扣电0.1C首放比容量、倍率性能、循环性能。
表一、实施例和对比例样品0.1C首放比容量、倍率性能、循环性能
样品名称 | 0.1C首放比容量mAh/g | 倍率性能%(2C/0.1C) | 循环性能%(0.1C 100圈容量保持率) |
实施例一 | 207.2 | 89.3 | 92.2 |
实施例二 | 208.5 | 90.4 | 92.8 |
实施例三 | 210.4 | 92.1 | 93.3 |
对比例一 | 202 | 88.5 | 90 |
对比例二 | 203 | 88.9 | 91 |
结果表明,以上三个实施例中高镍四元单晶正极材料的首次放电容量也有所提升,倍率性能改善明显,循环性能也有明显改善。对比三个实例中材料的性能,采用镍、钴、锰氧化物、铝金属和氟化锂制得的四元材料,具有更好的电性能。对比实施例和对比例,对比例中的Li(Ni0.8Co0.15Al0.05)O2和Li(Ni0.8Co0.1Mn0.1)O2的电性能较差,实施例中高镍四元单晶正极材料的电性能较高,说明通过本专利的高温固相法合成的高镍四元单晶正极材料,综合了LiNixCoyAlzO2和LiNixCoyMnzO2两者的优势,提高了材料的电性能。
Claims (9)
1.一种纯固相法制备高镍四元单晶正极材料的方法,其特征在于:将锂、镍、钴、锰的化合物及铝金属粉末按照化学式Lix(Ni1-a-b-cCoaMnbAlc)O2的摩尔比称取相应原料,将原料置于球磨瓶内,加入氧化锆球进行干法混合研磨,并在高温和氧气气氛下烧结,粉碎后得到高镍四元单晶正极材料。
其中,0.9≤x≤1.2,0.6≤1-a-b-c≤0.97,0.01≤a≤0.2,0.01≤b≤0.2,0.01≤c≤0.1。
2.根据权利要求1所述的一种纯固相法制备高镍四元单晶正极材料的方法,其特征在于:锂的化合物为氢氧化锂、碳酸锂、氟化锂中的任意一种。
3.根据权利要求1所述的一种纯固相法制备高镍四元单晶正极材料的方法,其特征在于:钴的化合物为氢氧化钴、碳酸钴、氧化钴、三氧化二钴、氧化亚钴中的任意一种。
4.根据权利要求1所述的一种纯固相法制备高镍四元单晶正极材料的方法,其特征在于:镍的化合物为氢氧化镍、碳酸镍、氧化镍、三氧化二镍中的任意一种。
5.根据权利要求1所述的一种纯固相法制备高镍四元单晶正极材料的方法,其特征在于:锰的化合物为氢氧化锰、碳酸锰、氧化锰、三氧化二锰中的任意一种。
6.根据权利要求1所述的一种纯固相法制备高镍四元单晶正极材料的方法,其特征在于:铝粉为铝金属粉末。
7.根据权利要求1所述的一种纯固相法制备高镍四元单晶正极材料的方法,其特征在于:烧结气氛为氧气,氧气含量为93%以上。
8.根据权利要求1所述的一种纯固相法制备高镍四元单晶正极材料的方法,其特征在于:干法混合研磨包括混料机内加入直径5毫米、10毫米、15毫米不同大小的氧化锆球进行球磨,球料重量比为1:1~2:1,球磨时间1~4小时。
9.根据权利要求1所述的一种纯固相法制备高镍四元单晶正极材料的方法,其特征在于:烧结分为两段温度烧结,首先是在400~600℃的空气气氛烧结4~12小时,烧结完毕后,破碎过筛,然后在700~900℃纯氧气氛中烧结10~40小时,冷却、破碎过筛,即得到高镍四元单晶正极材料。
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