WO2021258662A1 - 一种正极材料、其制备方法和锂离子电池 - Google Patents
一种正极材料、其制备方法和锂离子电池 Download PDFInfo
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- 239000007774 positive electrode material Substances 0.000 title claims abstract description 98
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 10
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 10
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000013078 crystal Substances 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 45
- 239000010410 layer Substances 0.000 claims abstract description 6
- 239000012792 core layer Substances 0.000 claims abstract description 3
- 239000011258 core-shell material Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 35
- 229910010707 LiFePO 4 Inorganic materials 0.000 claims description 30
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 28
- 229910010093 LiAlO Inorganic materials 0.000 claims description 27
- 239000010406 cathode material Substances 0.000 claims description 24
- 239000002243 precursor Substances 0.000 claims description 16
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 15
- 238000005245 sintering Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 238000001354 calcination Methods 0.000 claims description 13
- 239000006182 cathode active material Substances 0.000 claims description 10
- 229910003002 lithium salt Inorganic materials 0.000 claims description 10
- 159000000002 lithium salts Chemical class 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 5
- 229910018626 Al(OH) Inorganic materials 0.000 claims description 2
- 229910013716 LiNi Inorganic materials 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- 238000013019 agitation Methods 0.000 claims 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims 1
- 229910052808 lithium carbonate Inorganic materials 0.000 claims 1
- 238000007873 sieving Methods 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 14
- 238000000576 coating method Methods 0.000 abstract description 14
- 229910010092 LiAlO2 Inorganic materials 0.000 abstract 2
- 229910052493 LiFePO4 Inorganic materials 0.000 abstract 2
- 230000000052 comparative effect Effects 0.000 description 23
- 239000011572 manganese Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 239000011247 coating layer Substances 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910017052 cobalt Inorganic materials 0.000 description 4
- 239000010941 cobalt Substances 0.000 description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000001878 scanning electron micrograph Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 229910018040 Li 1+x Ni Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- -1 lithium hexafluorophosphate Chemical compound 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C01B25/00—Phosphorus; Compounds thereof
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Abstract
Description
首周充电比容量(mAh/g) | 首周效率(%) | 50周循环性能(%) | |
实施例1 | 224.3 | 88.1 | 99.1 |
实施例2 | 222.5 | 87.9 | 99.8 |
实施例3 | 228.9 | 87.5 | 97.9 |
实施例4 | 225.3 | 87.2 | 98.6 |
实施例5 | 223.4 | 87.4 | 98.2 |
实施例6 | 221.8 | 87.1 | 97.2 |
实施例7 | 220.9 | 86.9 | 97.3 |
实施例8 | 219.8 | 86.7 | 97.1 |
实施例9 | 229.7 | 88.0 | 96.8 |
实施例10 | 218.5 | 86.5 | 100.2 |
对比例1 | 219.2 | 86.3 | 94.0 |
对比例2 | 221.6 | 87.1 | 95.4 |
对比例3 | 222.3 | 87.5 | 96.2 |
Claims (26)
- 一种正极材料,所述正极材料为核壳结构,核层包括无钴单晶正极活性物质,壳层包括LiAlO 2和LiFePO 4。
- 根据权利要求1所述的正极材料,其中,所述无钴单晶正极活性物质的含量为98.5~99.9wt%。
- 根据权利要求1或2所述的正极材料,其中,所述LiAlO 2的含量为0.05~0.5wt%。
- 根据权利要求1-3任一项所述的正极材料,其中,所述LiFePO 4的含量为0.05~1wt%。
- 如权利要求1-4任一项所述的正极材料,其中,所述无钴单晶正极活性物质为LiNi xMn yO 2,0.45≤x≤0.95,0.05≤y≤0.55。
- 一种如权利要求1-5任一项所述正极材料的制备方法,所述方法包括如下步骤:将无钴单晶正极活性物质、锂盐、含铝材料和FePO 4混合,煅烧,得到正极材料。
- 如权利要求6所述的方法,其中,所述无钴单晶正极活性物质的制备方法包括:将锂盐和无钴正极活性物质前驱体混合,烧结,得到无钴单晶正极活性物质。
- 如权利要求7所述的方法,其中,所述无钴正极活性物质前驱体的化学式为Ni xMn y(OH) 2,0.45≤x≤0.95,0.05≤y≤0.55。
- 如权利要求6-8任一项所述的方法,其中,所述锂盐包括LiOH和/或Li2CO3。
- 如权利要求7-9任一项所述的方法,其中,所述烧结的温度为800~1000℃。
- 如权利要求7-10任一项所述的方法,其中,所述烧结的时间为10~20h。
- 如权利要求7-11任一项所述的方法,其中,所述烧结的气氛为空气气氛或O2气氛。
- 如权利要求7-12任一项所述的方法,其中,所述烧结之后,还包括将得到的产物进行破碎。
- 如权利要求13所述的方法,其中,破碎后的物料过300~400目筛。
- 如权利要求6-14任一项所述的方法,其中,所述无钴单晶正极活性物 质的残碱含量≤0.5wt%。
- 如权利要求6-15任一项所述的方法,其中,所述无钴单晶正极活性物质的pH值≤12。
- 如权利要求6-16任一项所述的方法,其中,所述无钴单晶正极活性物质的比表面积≤2m 2/g。
- 如权利要求6-17任一项所述的方法,其中,所述含铝材料为Al 2O 3和/或Al(OH) 3。
- 如权利要求6-18任一项所述的方法,其中,所述混合为搅拌混合。
- 如权利要求19所述的方法,其中,搅拌的速率为900~1000rpm。
- 如权利要求6-20任一项所述的方法,其中,所述混合的时间为5~20min。
- 如权利要求6-21任一项所述的方法,其中,所述煅烧的温度为400~700℃。
- 如权利要求6-22任一项所述的方法,其中,所述煅烧的时间为5~8h。
- 如权利要求6-23任一项所述的方法,其中,所述煅烧之后,还包括将产物进行300~400目筛分的过程。
- 如权利要求6-24任一项所述的方法,其中,所述方法包括如下步骤:(1)将锂盐和无钴正极活性物质前驱体进行搅拌混合5~15min,搅拌的转速为800~900rpm;(2)在空气或O 2气氛下,将步骤(1)得到的产物在800~1000℃烧结10~20h,将烧结得到的产物通过对辊破碎和气流粉碎,将粉碎后的物料过300~400目筛,得到无钴单晶正极活性物质;(3)将所述无钴单晶正极活性物质、锂盐、含铝材料和FePO 4进行搅拌混合5~20min,搅拌的速率为900~1000rpm,然后进行400~700℃煅烧5~8h,300~400目筛分,得到正极材料;所述正极材料中,所述无钴单晶正极活性物质的含量为98.5~99.9wt%,所述LiAlO 2的含量为0.05~0.5wt%,所述LiFePO 4的含量为0.05~1wt%。
- 一种锂离子电池,所述锂离子电池包括权利要求1-5任一项所述的正极材料。
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US17/787,923 US20230335713A1 (en) | 2020-06-24 | 2020-12-11 | Positive electrode material, preparation method therefor and lithium ion battery |
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CN115050945A (zh) * | 2022-07-15 | 2022-09-13 | 湖北工业大学 | 一种生物质氮掺杂碳包覆富锂磷酸铁锂正极材料的制备方法 |
CN115140782A (zh) * | 2022-04-27 | 2022-10-04 | 南通金通储能动力新材料有限公司 | 一种核壳结构的富锂锰基正极材料前驱体及其制备方法 |
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JP7324946B2 (ja) | 2023-08-10 |
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