CN102044704A - 抑制锂离子聚合物电池膨胀的方法 - Google Patents
抑制锂离子聚合物电池膨胀的方法 Download PDFInfo
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 15
- 229920000642 polymer Polymers 0.000 title claims abstract description 15
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000002401 inhibitory effect Effects 0.000 title abstract 2
- 239000002904 solvent Substances 0.000 claims abstract description 14
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical group O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000654 additive Substances 0.000 claims abstract description 10
- 230000000996 additive effect Effects 0.000 claims abstract description 10
- 229910003002 lithium salt Inorganic materials 0.000 claims abstract description 10
- 159000000002 lithium salts Chemical class 0.000 claims abstract description 10
- SJHAYVFVKRXMKG-UHFFFAOYSA-N 4-methyl-1,3,2-dioxathiolane 2-oxide Chemical compound CC1COS(=O)O1 SJHAYVFVKRXMKG-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003792 electrolyte Substances 0.000 claims abstract description 9
- 239000012785 packaging film Substances 0.000 claims abstract description 9
- 229920006280 packaging film Polymers 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims abstract description 6
- 229910013188 LiBOB Inorganic materials 0.000 claims abstract description 5
- 229920000098 polyolefin Polymers 0.000 claims abstract description 4
- 239000008151 electrolyte solution Substances 0.000 claims description 21
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 8
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 8
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 8
- 150000005676 cyclic carbonates Chemical class 0.000 claims description 8
- 239000011149 active material Substances 0.000 claims description 6
- 230000004888 barrier function Effects 0.000 claims description 6
- 229910013063 LiBF 4 Inorganic materials 0.000 claims description 4
- 229910012851 LiCoO 2 Inorganic materials 0.000 claims description 4
- 229910013131 LiN Inorganic materials 0.000 claims description 4
- 229910013870 LiPF 6 Inorganic materials 0.000 claims description 4
- SIXOAUAWLZKQKX-UHFFFAOYSA-N carbonic acid;prop-1-ene Chemical compound CC=C.OC(O)=O SIXOAUAWLZKQKX-UHFFFAOYSA-N 0.000 claims description 4
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 4
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910010707 LiFePO 4 Inorganic materials 0.000 claims description 3
- 229910015645 LiMn Inorganic materials 0.000 claims description 3
- 229910014689 LiMnO Inorganic materials 0.000 claims description 3
- 229910013716 LiNi Inorganic materials 0.000 claims description 3
- 229910013290 LiNiO 2 Inorganic materials 0.000 claims description 3
- 239000012467 final product Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004806 packaging method and process Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 4
- 229910001290 LiPF6 Inorganic materials 0.000 abstract 1
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 abstract 1
- ACFSQHQYDZIPRL-UHFFFAOYSA-N lithium;bis(1,1,2,2,2-pentafluoroethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)C(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)C(F)(F)F ACFSQHQYDZIPRL-UHFFFAOYSA-N 0.000 abstract 1
- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000008961 swelling Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 230000010261 cell growth Effects 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 206010033799 Paralysis Diseases 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002931 mesocarbon microbead Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
本发明涉及一种抑制锂离子聚合物电池膨胀的方法,步骤如下:(1)将正负极片分别在热态时碾压,碾压温度为50-150℃;所述隔膜采用聚烯烃微孔隔膜,其厚度为9-40mm,孔隙率为25-50%。(2)按常规将正负极片与隔膜卷绕成电池芯,并封装在铝塑包装膜内;(3)均匀混合配制含有锂盐、成膜添加剂的非水电解液;所述非水电解液含有的锂盐为:LiPF6、LiBF4、LiBOB、LiN(CF3SO2)2或LiN(C2F5SO2)2其中的一种或两种以上任意混合,浓度为0.4-1.2mol/L;所述非水电解液中的成膜添加剂为碳酸亚乙烯酯(VC),或者亚硫酸丙烯酯(PS),或者为两者任意混合,其占溶剂质量%含量为0.5-4%;(4)将所述非水电解液注入到铝塑包装膜中封口即可。本发明可有效防止电池在高温条件产生鼓胀变形。
Description
技术领域
本发明涉及一种抑制电池膨胀的方法,特别涉及一种抑制锂离子聚合物电池膨胀的方法。
背景技术
目前,聚合物锂离子电池在电子设备运行过程中均会散发热量,高温环境容易造成电池负极表面SEI膜分解及电解液溶剂在正负极表面发生氧化还原分解反应,产生CO、CO2 、CH4和C2H6等气体,使得聚合物锂离子电池鼓胀形变,电池容量和循环性能迅速下降,电子设备由于电池的形变也会遭到一定程度的破坏,严重时将会导致瘫痪。
因此,提供一种工艺简单、效果显著的抑制锂离子聚合物电池膨胀的方法,是该领域技术人员应着手解决的问题之一。
发明内容
本发明的目的在于克服上述不足之处,提供了一种工艺简单、操作方便、效果显著的抑制锂离子聚合物电池膨胀的方法。
为实现上述目的本发明所采用的实施方式如下:
一种抑制锂离子聚合物电池膨胀的方法,其特征在于实施步骤如下:
(1)将正负极片分别在热态时碾压,碾压温度为50-150℃;
所述正极片中的活性物质为LiCoO2、LiNiO2、LiNixCoyMnzO2(0≤x,y,z<1)、LiMn2O4、LiMnO2、LiFePO4中的一种或两种以上任意混合;
所述负极片中的活性物质为人造石墨、天然石墨中的一种或两种任意混合;
所述隔膜采用聚烯烃微孔隔膜,其厚度为9-40mm,孔隙率为25-50%;
(2)按常规将正负极片与隔膜卷绕成电池芯,并封装在铝塑包装膜内;
(3)均匀混合配制含有锂盐、成膜添加剂的非水电解液:
所述非水电解液含有的锂盐为:LiPF6、LiBF4、LiBOB、LiN(CF3SO2)
2或LiN(C2F5SO2)2其中的一种或两种以上任意混合,浓度为0.4-1.2mol/L;
所述非水电解液中的成膜添加剂为碳酸亚乙烯酯(VC),或者亚硫酸丙烯酯(PS),或者为两者任意混合,其占溶剂质量%含量为0.5-4%;
所述非水电解液中的主溶剂由环状碳酸酯和链状碳酸酯组成;环状碳酸酯主要为碳酸乙烯酯(EC)、碳酸丙烯酯(PC);链状碳酸酯主要为碳酸二乙酯(DEC)、碳酸二甲酯(DMC)、碳酸甲乙酯(EMC),电解液溶剂为其中的两种以上任意混合;
(4)按常规将所述非水电解液注入到铝塑包装膜中封口即可。
本发明的有益效果是:本发明中的锂离子聚合物电池具有优越的热稳定性,适合应用于高温环境中,能够有效的抑制电池在高温充放电情况下发生的鼓胀变形,改善电池的容量和循环性能,提高电池的安全性能。同时本发明工艺简单,可操作性强,确保电池的优良性能。
具体实施方式
以下结合较佳实施例,对依据本发明提供的具体实施方式、特征详述如下:
实施例1
一种抑制锂离子聚合物电池膨胀的方法,其特征在于实施步骤如下:
(1)将正负极片分别在热态时碾压,碾压温度为50-150℃;
所述正极片中的活性物质为LiCoO2、LiNiO2、LiNixCoyMnzO2(0≤x,y,z<1)、LiMn2O4、LiMnO2、LiFePO4中的一种或两种以上任意配比混合;
所述负极片中的活性物质为人造石墨、天然石墨中的一种或两种任意配比混合;
所述隔膜采用聚烯烃微孔隔膜,其厚度为9-40mm,孔隙率为25-50%。
(2)按常规将正负极片与隔膜卷绕成电池芯,并封装在铝塑包装膜内。
(3)均匀混合配制含有锂盐、成膜添加剂的非水电解液:
所述非水电解液含有的锂盐为:LiPF6、LiBF4、LiBOB、LiN(CF3SO2)
2或LiN(C2F5SO2)2其中的一种或两种以上任意配比混合,浓度为0.4-1.2mol/L;
所述非水电解液中的成膜添加剂为碳酸亚乙烯酯(VC),或者亚硫酸丙烯酯(PS),或者为两者任意混合,其占溶剂质量%含量为0.5-4%;
所述非水电解液中的主溶剂由环状碳酸酯和链状碳酸酯组成;环状碳酸酯主要为碳酸乙烯酯(EC)、碳酸丙烯酯(PC);链状碳酸酯主要为碳酸二乙酯(DEC)、碳酸二甲酯(DMC)、碳酸甲乙酯(EMC),电解液溶剂为其中的两种以上任意混合。
以上非水电解液按常规方法制备,故不详述。
(4)按常规将所述非水电解液注入到铝塑包装膜中封口即可。
实施例2
正极制备:将94wt% LiCoO2、4wt%导电炭黑和2wt%PVDF在NMP中混合成浆,均匀涂覆在铝集流体上,120℃下碾压,烘干,剪裁成81mm×650mm大小,并在一端焊接铝极耳。
负极制备:将94wt% MCMB、2wt%导电炭黑和4wt%PVDF在NMP中混合成浆,均匀涂覆在铜集流体上,110℃下碾压,烘干,剪裁成83mm×652mm大小,并在一端焊接镍极耳。
均匀混合配制含有锂盐、成膜添加剂的非水电解液:
所述非水电解液含有的锂盐为:LiPF6、LiBF4、LiBOB、LiN(CF3SO2)2或LiN(C2F5SO2)2其中的一种或两种以上任意配比混合,浓度为0.4-1.2mol/L;
所述非水电解液中的成膜添加剂为碳酸亚乙烯酯(VC),或者亚硫酸丙烯酯(PS),或者为两者任意配比混合,其占溶剂质量%含量为0.5-4%;
所述非水电解液中的主溶剂由环状碳酸酯和链状碳酸酯组成;环状碳酸酯主要为碳酸乙烯酯(EC)、碳酸丙烯酯(PC);链状碳酸酯主要为碳酸二乙酯(DEC)、碳酸二甲酯(DMC)、碳酸甲乙酯(EMC),电解液溶剂为其中的两种以上任意混合。
将制备好的正极、负极和隔膜卷绕成极组,封装在铝塑包装袋内,经过85℃烘干6小时后除去多余的水分,注入配制好的非水电解液,按常规进行真空吸液封口,注完液的电池待静置12小时后进行化成得到聚合物锂离子电池。
其它同实施例1
表1 是热碾压温度与电池循环厚度膨胀之间的关系,测试条件为高温60℃下以0.5C/0.5C循环300次,电压范围3V-4.2V。结果表明负极片经过热碾压后可以有效抑制电池在高温条件下的鼓胀,正极经过热碾压后的作用不是很明显。
表1热碾压温度与电池循环厚度膨胀之间的关系
举例说明 | 正极片碾压温度 | 负极片碾压温度 | 电池循环厚度鼓胀 |
例1 | 90℃ | 120℃ | 6.3% |
例2 | 25℃ | 120℃ | 6.1% |
例3 | 25℃ | 25℃ | 15.1% |
例4 | 90℃ | 25℃ | 16.2% |
本发明提供的锂离子聚合物电池用热态碾压极片,组装成电池后有效抑制正负极片的循环时厚度膨胀,能够防止电池在高温条件下使用而产生的鼓胀形变问题,从而达到抑制电池膨胀和变形、避免电池性能恶化的目的。
上述参照实施例对该抑制锂离子聚合物电池膨胀的方法进行的详细描述,是说明性的而不是限定性的;因此在不脱离本发明总体构思下的变化和修改,应属本发明的保护范围之内。
Claims (1)
1.一种抑制锂离子聚合物电池膨胀的方法,其特征在于实施步骤如下:
(1)将正负极片分别在热态时碾压,碾压温度为50-150℃;
所述正极片中的活性物质为LiCoO2、LiNiO2、LiNixCoyMnzO2(0≤x,y,z<1)、LiMn2O4、LiMnO2、LiFePO4中的一种或两种以上任意混合;
所述负极片中的活性物质为人造石墨、天然石墨中的一种或两种任意混合;
所述隔膜采用聚烯烃微孔隔膜,其厚度为9-40mm,孔隙率为25-50%;
(2)按常规将正负极片与隔膜卷绕成电池芯,并封装在铝塑包装膜内;
(3)均匀混合配制含有锂盐、成膜添加剂的非水电解液:
所述非水电解液含有的锂盐为:LiPF6、LiBF4、LiBOB、LiN(CF3SO2)
2或LiN(C2F5SO2)2其中的一种或两种以上任意混合,浓度为0.4-1.2mol/L;
所述非水电解液中的成膜添加剂为碳酸亚乙烯酯(VC),或者亚硫酸丙烯酯(PS),或者为两者任意混合,其占溶剂质量%含量为0.5-4%;
所述非水电解液中的主溶剂由环状碳酸酯和链状碳酸酯组成;环状碳酸酯主要为碳酸乙烯酯(EC)、碳酸丙烯酯(PC);链状碳酸酯主要为碳酸二乙酯(DEC)、碳酸二甲酯(DMC)、碳酸甲乙酯(EMC),电解液溶剂为其中的两种以上任意混合;
(4)按常规将所述非水电解液注入到铝塑包装膜中封口即可。
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