CN104183849A - 一种快离子导体表面包覆的固溶体正极材料的制备方法 - Google Patents
一种快离子导体表面包覆的固溶体正极材料的制备方法 Download PDFInfo
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- 239000006104 solid solution Substances 0.000 title claims abstract description 39
- 239000010416 ion conductor Substances 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000000463 material Substances 0.000 title abstract description 12
- 239000000243 solution Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 10
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229910052808 lithium carbonate Inorganic materials 0.000 claims abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 239000010406 cathode material Substances 0.000 claims description 17
- 239000011259 mixed solution Substances 0.000 claims description 12
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 11
- 238000000975 co-precipitation Methods 0.000 claims description 10
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000004137 mechanical activation Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 150000001868 cobalt Chemical class 0.000 claims description 6
- 150000002696 manganese Chemical class 0.000 claims description 6
- 150000002815 nickel Chemical class 0.000 claims description 6
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical group [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 claims description 5
- 229940099596 manganese sulfate Drugs 0.000 claims description 5
- 239000011702 manganese sulphate Substances 0.000 claims description 5
- 235000007079 manganese sulphate Nutrition 0.000 claims description 5
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical group [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims description 5
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical group [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 claims description 5
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims description 5
- 239000003153 chemical reaction reagent Substances 0.000 claims description 4
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 claims description 4
- 229910003002 lithium salt Inorganic materials 0.000 claims description 4
- 159000000002 lithium salts Chemical class 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 4
- MQRWBMAEBQOWAF-UHFFFAOYSA-N acetic acid;nickel Chemical compound [Ni].CC(O)=O.CC(O)=O MQRWBMAEBQOWAF-UHFFFAOYSA-N 0.000 claims description 3
- 229940011182 cobalt acetate Drugs 0.000 claims description 3
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims description 3
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims description 3
- QAHREYKOYSIQPH-UHFFFAOYSA-L cobalt(II) acetate Chemical compound [Co+2].CC([O-])=O.CC([O-])=O QAHREYKOYSIQPH-UHFFFAOYSA-L 0.000 claims description 3
- 229940071125 manganese acetate Drugs 0.000 claims description 3
- UOGMEBQRZBEZQT-UHFFFAOYSA-L manganese(2+);diacetate Chemical compound [Mn+2].CC([O-])=O.CC([O-])=O UOGMEBQRZBEZQT-UHFFFAOYSA-L 0.000 claims description 3
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical compound [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 claims description 3
- 229940078494 nickel acetate Drugs 0.000 claims description 3
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 229910021380 Manganese Chloride Inorganic materials 0.000 claims description 2
- GLFNIEUTAYBVOC-UHFFFAOYSA-L Manganese chloride Chemical compound Cl[Mn]Cl GLFNIEUTAYBVOC-UHFFFAOYSA-L 0.000 claims description 2
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims description 2
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 claims description 2
- XIXADJRWDQXREU-UHFFFAOYSA-M lithium acetate Chemical compound [Li+].CC([O-])=O XIXADJRWDQXREU-UHFFFAOYSA-M 0.000 claims description 2
- 239000011565 manganese chloride Substances 0.000 claims description 2
- 235000002867 manganese chloride Nutrition 0.000 claims description 2
- 229940099607 manganese chloride Drugs 0.000 claims description 2
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 claims description 2
- 229940072033 potash Drugs 0.000 claims description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 2
- 235000015320 potassium carbonate Nutrition 0.000 claims description 2
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 9
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 8
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 235000011007 phosphoric acid Nutrition 0.000 abstract 1
- 238000005303 weighing Methods 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 229910052759 nickel Inorganic materials 0.000 description 6
- WAEMQWOKJMHJLA-UHFFFAOYSA-N Manganese(2+) Chemical compound [Mn+2] WAEMQWOKJMHJLA-UHFFFAOYSA-N 0.000 description 5
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 5
- 239000010941 cobalt Substances 0.000 description 5
- 229910017052 cobalt Inorganic materials 0.000 description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 5
- 229910001437 manganese ion Inorganic materials 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 229910018338 Ni0.25CO0.05Mn0.7 Inorganic materials 0.000 description 2
- 229910011281 LiCoPO 4 Inorganic materials 0.000 description 1
- 229910013086 LiNiPO Inorganic materials 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- 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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Abstract
本发明涉及一种快离子导体表面包覆的新型锂离子电池正极材料，属于属于新能源材料领域。按照Li3-2x(Al1-xTix)2(PO4)3）的化学计量比称取H3PO4、TiO2、A12O3和Li2CO3并在烧杯中充分混均，接着把适量的层状固溶体正极材料粉末Li1.5NiyCozMn1-y-zO2.5分散在溶液中，然后在150-200℃加热1-3h，最后再在350-450℃加热2-5h得到本发明产品。该材料由于利用具有快离子导电性的（Li3-2x(Al1-xTix)2(PO4)3）作为包覆物，有效地提高了锂离子在正极材料表面的传输，进而提高了其倍率性能。
Description
技术领域
本发明涉及一种快离子导体表面包覆的新型锂离子电池正极材料，属于属于新能源材料领域。
背景技术
近年来，富锂固溶体正极材料xLi2MnO3·1-xLiMO2(0<x<1,M=Ni,Co,Mn)由于其具有较高的放电比容量，循环性能较好，能量密度高，而成为人们的研究热点，被认为是新一代电动汽车用锂离子动力电池的首选正极材料。
但是随着研究的深入，人们发现富锂固溶体正极材料还存在着倍率性能较差等缺点；这些缺点严重影响了富锂固溶体正极材料在电动汽车领域的应用，因此很有必要对其进行修饰改进，以提高其倍率性能。目前研究表明，表面包覆C，LiNiPO4，LiCoPO4等物质有利于提高其倍率性能。但是就目前报道的结果来看，其倍率性能仍不能满足电动汽车对锂离子电池的要求。因为上述包覆物本身不属于快离子导体，锂离子的导电系数较低，影响了固溶体正极材料率性能的提高。因此有必要发明新的包覆型固溶体正极材料，提高锂离子在正极材料表面的离子导电系数，进而提高固溶体正极材料的倍率性能，推进固溶体正极材料电动汽车用锂离子电池领域的发展。
发明内容
本发明提供了一种快离子导体（Li3-2x(Al1-xTix)2(PO4)3）表面包覆的新型锂离子电池固溶体正极材料，具体的发明内容如下：
1. 首先采用超声外场辅助共沉淀法制备层状固溶体正极材料Li1.5NiyCozMn1-y-zO2.5（0<y<1, 0<z<1, 0<y+z<1）：按照化学计量比称取镍盐、钴盐、锰盐以及过量20%的沉淀剂，配制成一定浓度的溶液，通过超声外场辅助共沉淀法，控制合适的温度和pH值，制备前驱体，然后和按化学计量比称取的锂盐混合，经过机械活化1-12h，在400-600℃下焙烧1-12h，再在750-900℃下焙烧8-24h，最后冷却得到层状固溶体正极材料Li1.5NiyCozMn1-y-zO2.5（0<y<1, 0<z<1, 0<y+z<1）。
2. 快离子导体（Li3-2x(Al1-xTix)2(PO4)3）表面包覆的层状固溶体正极材料的制备：按照Li3-2x(Al1-xTix)2(PO4)3）的化学计量比称取H3PO4、TiO2、A12O3和Li2CO3并在烧杯中充分混均，接着把适量的层状固溶体正极材料粉末分散在溶液中，然后在150-200℃加热1-3 h，最后再在350-450℃加热2-5h得到本发明产品。
3. 在上述步骤1中，镍盐为硫酸镍、氯化镍、硝酸镍或醋酸镍；钴盐为硫酸钴、氯化钴、硝酸钴或醋酸钴；锰盐为硫酸锰、氯化锰、硝酸锰或醋酸锰；沉淀剂为氢氧化钠、氢氧化钾、碳酸钠或碳酸钾；锂盐为氢氧化锂、碳酸锂、硝酸锂或醋酸锂；所述溶液中镍盐、钴盐和锰盐的溶液溶度之和为0.1-1mol/L；共沉淀的温度为50-80℃，pH值为8.0-12.0。
4. 在上述步骤2中，x的取值为0.5≤x≤1；（Li3-2x(Al1-xTix)2(PO4)3）的质量分数为（Li3-2x(Al1-xTix)2(PO4)3）包覆Li1.5NiyCozMn1-y-zO2.5正极材料总质量的0.1-3%。
通过上述方法，制备的（Li3-2x(Al1-xTix)2(PO4)3）包覆的Li1.5NiyCozMn1-y-zO2.5正极材料，该材料由于利用具有快离子导电性的（Li3-2x(Al1-xTix)2(PO4)3）作为包覆物，有效地提高了锂离子在xLi2MnO3·1-xLiNiaCobMn1-a-bO2正极材料表面的传输，进而提高了其倍率性能。
附图说明
图1 实施例1中的（Li1.2(Al0.1Ti0.9)2(PO4)3）包覆的Li1.5Ni0.2Co0.2Mn0.6O2.5正极材料与未包覆正极材料的倍率性能比较图；从图1中我们可以看出，经过快离子导体（Li1.2(Al0.1Ti0.9)2(PO4)3）的包覆处理，层状固溶体正极材料Li1.5Ni0.2Co0.2Mn0.6O2.5的首次放电容量和倍率性能都得到了显著的提升，该结果表明了本发明的有效性和先进性。
具体实施方式
实施例1：首先按照化学计量比称取硫酸镍、硫酸钴、硫酸锰以及过量20%的氢氧化钠，配制成浓度为0.1mol/L镍钴锰的混合溶液，溶液中镍、钴、锰离子的浓度比为1:1:3，混合溶液中氢氧化钠的浓度为0.24mol/L，通过超声外场辅助共沉淀法，控制温度在50℃，pH值控制在8.0，制备前驱体，然后和按化学计量比称取的碳酸锂混合，经过机械活化1h，在400℃下焙烧1h，再在750℃下焙烧24h，最后冷却得到层状固溶体正极材料Li1.5Ni0.2Co0.2Mn0.6O2.5；接着按照Li1.2(Al0.1Ti0.9)2(PO4)3）的化学计量比称取H3PO4、TiO2、A12O3和Li2CO3并在烧杯中充分混均，接着把适量的层状固溶体正极材料粉末分散在溶液中，然后在150℃加热3 h，最后再在350℃加热5h得到本发明产品；控制Li1.2(Al0.1Ti0.9)2(PO4)3）的包覆量为0.1%。
从图1中我们可以看出，经过快离子导体（Li1.2(Al0.1Ti0.9)2(PO4)3）的包覆处理，层状固溶体正极材料Li1.5Ni0.2Co0.2Mn0.6O2.5的首次放电容量和倍率性能都得到了显著的提升。
实施例2：首先按照化学计量比称取硫酸镍、硫酸钴、硫酸锰以及过量20%的氢氧化钠，配制成浓度为1mol/L镍钴锰的混合溶液，溶液中镍、钴、锰离子的浓度比为1:1:2，混合溶液中氢氧化钠的浓度为2.4mol/L，通过超声外场辅助共沉淀法，控制温度在80℃，pH值控制在12.0，制备前驱体，然后和按化学计量比称取的碳酸锂混合，经过机械活化12h，在400℃下焙烧4h，再在900℃下焙烧8h，最后冷却得到层状固溶体正极材料Li1.5Ni0.25Co0.25Mn0.5O2.5；接着按照Li1.4(Al0.2Ti0.8)2(PO4)3）的化学计量比称取H3PO4、TiO2、A12O3和Li2CO3并在烧杯中充分混均，接着把适量的层状固溶体正极材料粉末分散在溶液中，然后在200℃加热1 h，最后再在450℃加热2h得到本发明产品；控制Li1.4(Al0.2Ti0.8)2(PO4)3）的包覆量为3%。
经过快离子导体Li1.4(Al0.2Ti0.8)2(PO4)3）的包覆处理，层状固溶体正极材料Li1.5Ni0.25Co0.25Mn0.5O2.5的首次放电容量和倍率性能的提升同实施例1。
实施例3：首先按照化学计量比称取硝酸镍、硝酸钴、硝酸锰以及过量20%的氢氧化钾，配制成浓度为0.5mol/L镍钴锰的混合溶液，溶液中镍、钴、锰离子的浓度比为0.25:0.15:0.6，混合溶液中氢氧化钠的浓度为1.2mol/L，通过超声外场辅助共沉淀法，控制温度在60℃，pH值控制在11.0，制备前驱体，然后和按化学计量比称取的碳酸锂混合，经过机械活化4h，在400℃下焙烧6h，再在850℃下焙烧12h，最后冷却得到层状固溶体正极材料Li1.5Ni0.25Co0.15Mn0.6O2.5；接着按照Li1.6(Al0.3Ti0.7)2(PO4)3）的化学计量比称取H3PO4、TiO2、A12O3和Li2CO3并在烧杯中充分混均，接着把适量的层状固溶体正极材料粉末分散在溶液中，然后在160℃加热2 h，最后再在400℃加热3h得到本发明产品；控制Li1.6(Al0.3Ti0.7)2(PO4)3）的包覆量为1.5%。
经过快离子导体Li1.6(Al0.3Ti0.7)2(PO4)3）的包覆处理，层状固溶体正极材料Li1.5Ni0.25Co0.15Mn0.6O2.5的首次放电容量和倍率性能的提升同实施例1。
实施例4：首先按照化学计量比称取醋酸镍、醋酸钴、醋酸锰以及过量20%的碳酸钠，配制成浓度为0.6mol/L镍钴锰的混合溶液，溶液中镍、钴、锰离子的浓度比为0.25:0.05:0.7，混合溶液中氢氧化钠的浓度为1.44mol/L，通过超声外场辅助共沉淀法，控制温度在70℃，pH值控制在11.0，制备前驱体，然后和按化学计量比称取的碳酸锂混合，经过机械活化5h，在400℃下焙烧6h，再在900℃下焙烧12h，最后冷却得到层状固溶体正极材料Li1.5Ni0.25Co0.05Mn0.7O2.5；接着按照Li1.8(Al0.4Ti0.6)2(PO4)3）的化学计量比称取H3PO4、TiO2、A12O3和Li2CO3并在烧杯中充分混均，接着把适量的层状固溶体正极材料粉末分散在溶液中，然后在180℃加热2 h，最后再在400℃加热2h得到本发明产品；控制Li1.8(Al0.4Ti0.6)2(PO4)3）的包覆量为2%。
经过快离子导体Li1.8(Al0.4Ti0.6)2(PO4)3）的包覆处理，层状固溶体正极材料Li1.5Ni0.25Co0.05Mn0.7O2.5的首次放电容量和倍率性能的提升同实施例1。
实施例5：首先按照化学计量比称取硫酸镍、硫酸钴、硫酸锰以及过量20%的氢氧化钠，配制成浓度为0.2mol/L镍钴锰的混合溶液，溶液中镍、钴、锰离子的浓度比为1:1:2，混合溶液中氢氧化钠的浓度为0.48mol/L，通过超声外场辅助共沉淀法，控制温度在70℃，pH值控制在11.0，制备前驱体，然后和按化学计量比称取的碳酸锂混合，经过机械活化6h，在400℃下焙烧6h，再在850℃下焙烧12h，最后冷却得到层状固溶体正极材料Li1.5Ni0.25Co0.25Mn0.5O2.5；接着按照Li1.4(Al0.2Ti0.8)2(PO4)3）的化学计量比称取H3PO4、TiO2、A12O3和Li2CO3并在烧杯中充分混均，接着把适量的层状固溶体正极材料粉末分散在溶液中，然后在170℃加热2 h，最后再在400℃加热2h得到本发明产品；控制Li1.4(Al0.2Ti0.8)2(PO4)3）的包覆量为3%。
经过快离子导体Li1.4(Al0.2Ti0.8)2(PO4)3）的包覆处理，层状固溶体正极材料Li1.5Ni0.25Co0.25Mn0.5O2.5的首次放电容量和倍率性能的提升同实施例1。
Claims (4)
1.一种快离子导体表面包覆的固溶体正极材料的制备方法，其特征在于：按照Li3-2x(Al1-xTix)2(PO4)3）的化学计量比称取H3PO4、TiO2、A12O3和Li2CO3并在烧杯中充分混均，接着把适量的层状固溶体正极材料粉末分散在溶液中，所述层状固溶体正极材料粉末为Li1.5NiyCozMn1-y-zO2.5，0<y<1, 0<z<1, 0<y+z<1，然后在150-200℃加热1-3 h，最后再在350-450℃加热2-5h得到（Li3-2x(Al1-xTix)2(PO4)3）包覆Li1.5NiyCozMn1-y-zO2.5正极材料。
2.如权利要求1所述的一种快离子导体表面包覆的固溶体正极材料的制备方法，其特征在于所述层状固溶体正极材料粉末的制备方法如下：按照化学计量比称取镍盐、钴盐、锰盐以及过量20%的沉淀剂，配制成一定浓度的混合溶液，通过超声外场辅助共沉淀法，控制合适的温度和pH值，制备前驱体，然后和按化学计量比称取的锂盐混合，经过机械活化1-12h，在400-600℃下焙烧1-12h，再在750-900℃下焙烧8-24h，最后冷却得到层状固溶体正极材料Li1.5NiyCozMn1-y-zO2.5，0<y<1, 0<z<1, 0<y+z<1。
3.如权利要求2所述的一种快离子导体表面包覆的固溶体正极材料的制备方法，其特征在于：所述镍盐为硫酸镍、氯化镍、硝酸镍或醋酸镍；钴盐为硫酸钴、氯化钴、硝酸钴或醋酸钴；锰盐为硫酸锰、氯化锰、硝酸锰或醋酸锰；沉淀剂为氢氧化钠、氢氧化钾、碳酸钠或碳酸钾；锂盐为氢氧化锂、碳酸锂、硝酸锂或醋酸锂；所述混合溶液中镍盐、钴盐和锰盐的溶液溶度之和为0.1-1mol/L；共沉淀的温度为50-80℃，pH值为8.0-12.0。
4.如权利要求1所述的一种快离子导体表面包覆的固溶体正极材料的制备方法，其特征在于：x的取值为0.5≤x≤1；（Li3-2x(Al1-xTix)2(PO4)3）的质量分数为（Li3-2x(Al1-xTix)2(PO4)3）包覆Li1.5NiyCozMn1-y-zO2.5正极材料总质量的0.1-3%。
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