WO2017124715A1 - 一种锂离子电池隔膜及其制作方法 - Google Patents

一种锂离子电池隔膜及其制作方法 Download PDF

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WO2017124715A1
WO2017124715A1 PCT/CN2016/090791 CN2016090791W WO2017124715A1 WO 2017124715 A1 WO2017124715 A1 WO 2017124715A1 CN 2016090791 W CN2016090791 W CN 2016090791W WO 2017124715 A1 WO2017124715 A1 WO 2017124715A1
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Prior art keywords
separator
battery
organic polymer
coating
pole piece
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English (en)
French (fr)
Inventor
林跃生
米万良
金翼
王绥军
傅凯
刘曙光
闫雪生
褚永金
赵录兴
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China Electric Power Research Institute Co Ltd CEPRI
North China Branch of State Grid Corp of China
State Grid Corp of China SGCC
Arizona State University ASU
Arizona State University Downtown Phoenix campus
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China Electric Power Research Institute Co Ltd CEPRI
North China Branch of State Grid Corp of China
State Grid Corp of China SGCC
Arizona State University ASU
Arizona State University Downtown Phoenix campus
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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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/446—Composite material consisting of a mixture of organic and inorganic materials
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention relates to the technical field of lithium ion battery manufacturing, and in particular to a lithium ion battery separator and a manufacturing method thereof.
  • Lithium-ion batteries have the advantages of high energy density, good power characteristics, long cycle life, good environmental adaptability and no memory effect. They have broad application prospects in electric vehicles and new energy storage. However, the price and safety of lithium-ion batteries limit their application in real life. In order to solve such problems, the researchers have done a lot of improvement work on the positive electrode, the negative electrode, the electrolyte and the separator of the battery.
  • the lithium ion battery separator exists between the positive electrode and the negative electrode and has the function of conducting lithium ions, which plays a key role in the safety of the lithium ion battery.
  • the battery separator In order to avoid physical contact between the positive and negative electrodes, the battery separator must have strong thermal stability and mechanical properties.
  • the most widely used in the business is a porous organic polymer membrane composed of polyethylene (PE) or/and polypropylene (PP). The thermal stability of these polymer membranes is poor. At high temperatures, thermal deformation or melting of the membrane can induce thermal runaway of the thermal battery and cause the battery to burn.
  • the battery is likely to form lithium dendrites on the negative electrode of the battery after long-term circulation, and the organic polymer separator is easily pierced by lithium dendrites, posing a safety problem.
  • the organic polymer membrane itself is flammable and poses a major fire hazard.
  • the organic polymer separator has poor wettability to the electrolyte due to its inherent hydrophobicity, which has an impact on battery production process control and battery performance.
  • organic-inorganic composite membranes Two of the typical diaphragm types are: (1) a composite membrane in which an inorganic material is filled in a polymer organic membrane; and (2) a composite membrane in which an inorganic material is coated on the surface of an organic membrane.
  • the fiberglass reinforced polyvinylidene fluoride (PVDF) composite separator exhibits stable cycle performance and improves the wetting property to the electrolyte.
  • the PVDF/SiO 2 composite separator also has excellent thermal stability and cycle performance as well as excellent capacity retention.
  • An organic-inorganic composite separator formed by coating a thin layer of Al 2 O 3 on both sides of polyimide (PI) also exhibits better battery performance.
  • the organic-inorganic composite membrane better improves the electrochemical performance and physical properties of the battery, it still has the inherent characteristics of the organic polymer membrane, and the space for further improvement is small and difficult.
  • Research on inorganic separators has recently become a hot spot of concern.
  • the sintered porous Al 2 O 3 or SiO 2 inorganic separator has a thickness of 50 ⁇ m to 200 ⁇ m and a porosity of about 70%.
  • the battery using such an inorganic separator has high safety performance, electrolyte wetting property and high electric power. Chemical properties, but because the inorganic separator itself is brittle, brittle, and costly to manufacture, while the inorganic separator is less compatible with existing battery production equipment, these factors limit the commercial scale application of inorganic separators.
  • the object of the present invention is to provide a lithium ion battery separator and a manufacturing method thereof, which are low-cost inorganic materials. After being mixed with the organic polymer, it is coated on the surface of the electrode to prepare a separator which is compatible with the electrode. The positive and negative electrode sheets coated with the separator are directly combined into a battery core, and the liquid injection is completed, thereby achieving large-scale production.
  • a lithium ion battery separator comprising an organic polymer and an inorganic material having a mass fraction of 0.2 to 1%, the separator having a thickness of 15 to 60 ⁇ m.
  • the organic polymer is polyvinyl alcohol, polyethylene, polypropylene, polyvinylidene fluoride, polyimide, polyethylene oxide or polyacrylonitrile.
  • the inorganic material is ⁇ -Al 2 O 3 , SiO 2 , CaCO 3 , ZrO 2 or TiO 2 .
  • the organic polymer has a mass fraction of 0.2 to 0.6%.
  • the organic polymer is polyvinyl alcohol.
  • the inorganic material is ⁇ -Al 2 O 3 .
  • the mass fraction of the organic polymer is 0.4%.
  • the separator has a thickness of 40 ⁇ m.
  • a method of fabricating the membrane comprising the steps of:
  • step 2) coating and drying: the slurry obtained in step 1) is applied to the surface of the battery pole piece to a thickness of 10 ⁇ 20 ⁇ m, dried at 30 ⁇ 50 ° C and 50 ⁇ 80% humidity for 8 ⁇ 12h;
  • step 2) Repeat the operation of step 2) 1 to 3 times;
  • the cell pole piece obtained in the step 3) was vacuum dried at 70 ° C for 5 to 10 h.
  • the battery pole piece in step 2) is dried at 40 ° C and 60% humidity for 8 h.
  • the present invention has the following beneficial effects:
  • the inorganic material used in the invention is cheap and easy to obtain, the material has thermal stability, can be flame retarded, and the battery separator coated with a small amount of organic polymer has a great safety advantage over the organic separator;
  • the battery separator produced by the invention has a multi-empty structure to ensure the battery has excellent electrochemical performance
  • the method of the invention is simple and easy to operate, has good processing performance, and has good compatibility with current battery process equipment, and can be used for large-scale production.
  • Figure 1 Surface scanning electron micrograph of the lithium titanate pole piece coated with the separator of Example 1;
  • Figure 2 is a cross-sectional scanning electron micrograph of a lithium titanate pole piece coated with a separator of Example 1;
  • FIG. 3 Electrochemical performance of a battery coated with different membranes; wherein a Example 1 membrane, b PP organic membrane.
  • a method for manufacturing a lithium ion battery separator includes the following steps:
  • a coating material a PVA (polyvinyl alcohol) aqueous solution having a mass fraction of 5%, ⁇ -Al 2 O 3 powder, and deionized water are disposed in a slurry at a mass ratio of 0.8:10:2.375;
  • PVA polyvinyl alcohol
  • step 2) coating and drying: the slurry obtained in step 1) is applied to the surface of the lithium titanate pole piece at a thickness of 20 ⁇ m, and then the battery pole piece is dried at 40 ° C, 60% humidity for 8 h;
  • step 2) repeats the operation of step 2) once;
  • FIGS. 1 and 2 wherein the coating layer is P 2 -containing Al 2 O 3 .
  • the coating, PVA has a mass fraction of 0.4% and a thickness of 40 ⁇ m, which acts as a battery separator, and the electrochemical performance of the PP organic separator is shown in Fig. 3.
  • a method for manufacturing a lithium ion battery separator includes the following steps:
  • a coating material a PVA (polyvinyl alcohol) aqueous solution having a mass fraction of 5%, ⁇ -Al 2 O 3 powder, and deionized water are disposed in a slurry at a mass ratio of 0.4:10:2.375;
  • PVA polyvinyl alcohol
  • step 2) coating and drying: the slurry obtained in step 1) is applied to the surface of the lithium titanate pole piece at a thickness of 15 ⁇ m, and then the battery pole piece is dried at 40 ° C, 60% humidity for 8 h;
  • step 2) repeats the operation of step 2) once;
  • the coating layer is a PVA-containing Al 2 O 3 coating, and the PVA mass fraction is 0.2. %, thickness 30 ⁇ m, with the function of battery separator.
  • a method for manufacturing a lithium ion battery separator includes the following steps:
  • a PVA polyvinyl alcohol
  • aqueous solution having a mass fraction of 5%, ⁇ -Al 2 O 3 powder, and deionized water are disposed in a slurry ratio of 1.6:10:2.375 by mass ratio;
  • step 2) coating and drying: the slurry obtained in step 1) is applied to the surface of the lithium titanate electrode sheet at a thickness of 20 ⁇ m, and then the battery pole piece is dried at 50 ° C, 60% humidity for 10 h;
  • step 2) repeats the operation of step 2) once;
  • step 4) vacuum drying the obtained battery pole piece of step 3) at 70 ° C for 8 h to remove moisture and gas, thereby obtaining a battery pole piece, wherein the coating layer is a PVA-containing Al 2 O 3 coating, and the mass fraction of PVA is 0.8. %, the thickness is 40 ⁇ m, and the coating layer is a battery separator.
  • the coating layer is a PVA-containing Al 2 O 3 coating, and the mass fraction of PVA is 0.8. %, the thickness is 40 ⁇ m, and the coating layer is a battery separator.
  • a method for manufacturing a lithium ion battery separator includes the following steps:
  • a coating material a PVA (polyvinyl alcohol) aqueous solution having a mass fraction of 5%, SiO 2 powder, and deionized water are disposed in a slurry ratio of 0.8:10:2.375 in a mass ratio;
  • PVA polyvinyl alcohol
  • step 2) coating and drying: the slurry obtained in step 1) is applied to the surface of the lithium titanate electrode sheet at a thickness of 16 ⁇ m, and then the battery pole piece is dried at 30 ° C, 60% humidity for 12 h;
  • step 2) repeats the operation of step 2) once;
  • a method for manufacturing a lithium ion battery separator includes the following steps:
  • a coating material a PVA (polyvinyl alcohol) aqueous solution having a mass fraction of 5%, CaCO 3 powder, and deionized water are disposed in a slurry ratio of 0.8:10:2.375 by mass ratio;
  • PVA polyvinyl alcohol
  • step 2) coating and drying: the slurry obtained in step 1) is applied to the surface of the lithium titanate electrode sheet at a thickness of 18 ⁇ m, and then the battery pole piece is dried at 40 ° C, 60% humidity for 8 h;
  • step 2) repeats the operation of step 2) once;
  • a method for manufacturing a lithium ion battery separator includes the following steps:
  • PVDF polyvinylidene fluoride
  • DMSO dimethyl sulfoxide
  • step 2) coating and drying: the slurry obtained in step 1) is applied to the surface of the lithium titanate electrode sheet at a thickness of 20 ⁇ m, and then the battery pole piece is dried at 30 ° C, 50% humidity for 8 h;
  • step 2) repeats the operation of step 2) once;
  • the coating layer is a PVDF-containing Al 2 O 3 coating, the PVDF mass fraction It is 0.4% and the thickness is 40 ⁇ m.
  • a method for manufacturing a lithium ion battery separator includes the following steps:
  • PI polyimide
  • DMSO dimethyl sulfoxide
  • the slurry obtained in the step 1) is applied to the surface of the lithium titanate electrode sheet at a thickness of 20 ⁇ m. Then, the battery pole piece is dried at 30 ° C, 50% humidity for 8 h;
  • step 2) repeats the operation of step 2) once;

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Abstract

本发明提供一种锂离子电池隔膜及其制作方法，所述隔膜包括质量分数为0.2～1％的有机聚合物和无机材料，所述隔膜的厚度为15～60μm；所述制作方法包括如下步骤：1)配制涂敷料：将有机聚合物和无机材料溶于溶剂制成浆液状涂敷料；2)涂敷及干燥：将步骤1)所得浆液涂敷于电池极片表面至10～20μm厚，于30～50℃和50～80％的湿度下干燥8～12h；3)重复步骤2)的操作1～3次；4)于70℃下真空干燥步骤3)所得电池极片5～10h。本发明的锂离子电池隔膜使电池具有更高的充放电容量和较好的循环性能，制作方法简单，成本低，可用于规模化的工业生产。

Description

一种锂离子电池隔膜及其制作方法 技术领域
本发明涉及锂离子电池制造技术领域，具体涉及一种锂离子电池隔膜及其制作方法。
背景技术
锂离子电池具有能量密度高、功率特性好、循环寿命长、环境适应性好和无记忆效应等优点，在电动汽车和新能源储能等领域有广阔的应用前景。但是锂离子电池的价格及安全性等因素限制了其在实际生活中的应用。为了解决这类问题，研究人员在电池的正极、负极、电解质和隔膜等方面做了大量改进工作。
锂离子电池隔膜存在于正极和负极之间，具有传导锂离子的作用，对锂离子电池的安全起到关键作用。为了避免正负极的物理接触，电池隔膜必须具有较强的热稳定性能和机械性能。商业中使用最广泛的是由聚乙烯(PE)或/和聚丙烯(PP)组成多孔有机聚合物隔膜。这些聚合物隔膜的热稳定性不佳，在高温下，隔膜的热变形或熔化能诱导热电池热失控，并造成电池燃烧。另外，电池经过长期循环在电池负极极片上很可能会形成锂枝晶，有机聚合物隔膜很容易被锂枝晶刺破，造成安全问题。在发生火灾的情况下，有机聚合物隔膜本身是可燃的，具有构成重大火灾隐患。此外，有机聚合物隔膜由于本身固有的疏水性，对电解液的润湿性能较差，这对电池生产工艺控制和电池性能发挥都会造成影响。
为了提高锂离子电池的安全性和可靠性，在传统有机隔膜中引入高稳定性的无机材料，形成有机-无机复合隔膜。其中两个典型隔膜类型是：(1)无机材料填充在高分子有机隔膜中的复合隔膜；(2)无机材料涂覆在有机隔膜表面的复合隔膜。纤维玻璃增强的聚偏氟乙烯(PVDF)复合隔膜表现出稳定的循环性能，并提高了对电解液的浸润性能。PVDF/SiO2复合隔膜同样具有优异的热稳定性和循环性能，以及优异的容量保持性能。在聚酰亚胺(PI)两侧涂覆较薄的Al2O3层形成的有机-无机复合隔膜也表现出较好的电池性能。
尽管有机-无机复合隔膜较好的改进了电池的电化学性能和物理性能，但是仍然具有有机聚合物隔膜固有的特点，进一步改进的空间较小，难度较大。无机隔膜的研究最近成为关注的热点。烧结而成的多孔Al2O3或SiO2无机隔膜厚度50μm到200μm之间，孔隙率70％左右，采用这类无机隔膜的电池具有较高的安全性能、电解液浸润性能以及较高的电化学性能，但是由于无机隔膜本身较脆，易碎，并且制造成本较高，同时无机隔膜与现有的电池生产设备兼容性较差，这些因素限制了无机隔膜的商业化规模应用。
发明内容
本发明的目的是提供一种锂离子电池隔膜及其制作方法，将低成本的无机材料 与有机聚合物混合后涂敷在电极表面，制备成与电极相容较好的隔膜，涂敷隔膜后的正负极片直接组合成电芯，并完成注液，可实现规模化生产。
一种锂离子电池隔膜，所述隔膜包括质量分数为0.2～1％的有机聚合物和无机材料，所述隔膜的厚度为15～60μm。
所述的隔膜的第一优选技术方案，所述有机聚合物为聚乙烯醇、聚乙烯、聚丙烯、聚偏氟乙烯、聚酰亚胺、聚环氧乙烷或聚丙烯腈。
所述的隔膜的第二优选技术方案，所述无机材料为α-Al2O3、SiO2、CaCO3、ZrO2或TiO2。
所述的隔膜的第三优选技术方案，所述有机聚合物的质量分数为0.2～0.6％。
所述的隔膜的第四优选技术方案，所述有机聚合物为聚乙烯醇。
所述的隔膜的第五优选技术方案，所述无机材料为α-Al2O3。
所述的隔膜的第六优选技术方案，所述有机聚合物的质量分数为0.4％。
所述的隔膜的第七优选技术方案，所述隔膜的厚度为40μm。
一种所述隔膜的制作方法，所述方法包括如下步骤：
1)配制涂敷料：将有机聚合物和无机材料溶于溶剂制成浆液状涂敷料；
2)涂敷及干燥：将步骤1)所得浆液涂敷于电池极片表面至10～20μm厚，于30～50℃和50～80％的湿度下干燥8～12h；
3)重复步骤2)的操作1～3次；
4)于70℃下真空干燥步骤3)所得电池极片5～10h。
所述制作方法的第一优选技术方案，步骤2)中所述电池极片于40℃和60％的湿度下干燥8h。
与最接近的现有技术比，本发明具有如下有益效果：
1)本发明所用无机材料廉价易得，材料具有热稳定性，可以阻燃，与少量有机聚合物混合后涂敷而成的电池隔膜比有机隔膜具有很大的安全优势；
2)本发明制作得到的电池隔膜具有多空结构，保证电池具有优异电化学性能；
3)本发明方法简单易行，可加工性能好，与目前电池工艺设备兼容性好，可用于大规模化生产。
附图说明
图1：实施例1涂敷隔膜的钛酸锂极片的表面扫描电镜图；
图2：实施例1涂敷隔膜的钛酸锂极片的截面扫描电镜图；
图3：涂敷不同隔膜的电池电化学性能；其中a实施例1隔膜，b PP有机隔膜。
具体实施方式
为了更清楚地说明本发明的技术方案和技术效果，以下将结合附图和实施例对本发明作进一步说明。
实施例1
一种锂离子电池隔膜的制作方法包括如下步骤：
1)配置涂敷料：将质量分数为5％的PVA(聚乙烯醇)水溶液、α-Al2O3粉和去离子水以0.8:10:2.375的质量比配置成浆液；
2)涂敷及干燥：将步骤1)所得浆液以20μm的厚度涂敷于钛酸锂极片表面，再将电池极片于40℃下，60％的湿度中干燥8h；
3)重复步骤2)的操作1次；
4)于70℃下真空干燥步骤3)所得电池极片6h，除去水分和气体，即可得到如图1和图2所示的电池极片，其中涂敷层为含PVA的Al2O3涂层，PVA的质量分数为0.4％，厚度为40μm，起到电池隔膜的作用，与PP有机隔膜的电化学性能对比如图3所示。
实施例2
一种锂离子电池隔膜的制作方法包括如下步骤：
1)配置涂敷料：将质量分数为5％的PVA(聚乙烯醇)水溶液、α-Al2O3粉和去离子水以0.4:10:2.375的质量比配置成浆液；
2)涂敷及干燥：将步骤1)所得浆液以15μm的厚度涂敷于钛酸锂极片表面，再将电池极片于40℃下，60％的湿度中干燥8h；
3)重复步骤2)的操作1次；
4)于70℃下真空干燥步骤3)所得电池极片6h，除去水分和气体，即可得到电池极片，其中涂敷层为含PVA的Al2O3涂层，PVA的质量分数为0.2％，厚度为30μm，具有电池隔膜的功能。
实施例3
一种锂离子电池隔膜的制作方法包括如下步骤：
1)配置涂敷料：将质量分数为5％的PVA(聚乙烯醇)水溶液、α-Al2O3粉和去离子水以1.6:10:2.375的质量比配置成浆液；
2)涂敷及干燥：将步骤1)所得浆液以20μm的厚度涂敷于钛酸锂极片表面，再将电池极片于50℃下，60％的湿度中干燥10h；
3)重复步骤2)的操作1次；
4)于70℃下真空干燥步骤3)所得电池极片8h，除去水分和气体，即可得到电池极片，其中涂敷层为含PVA的Al2O3涂层，PVA的质量分数为0.8％，厚度为40μm，涂覆层为电池隔膜。
实施例4
一种锂离子电池隔膜的制作方法包括如下步骤：
1)配置涂敷料：将质量分数为5％的PVA(聚乙烯醇)水溶液、SiO2粉和去离 子水以0.8:10:2.375的质量比配置成浆液；
2)涂敷及干燥：将步骤1)所得浆液以16μm的厚度涂敷于钛酸锂极片表面，再将电池极片于30℃下，60％的湿度中干燥12h；
3)重复步骤2)的操作1次；
4)于70℃下真空干燥步骤3)所得电池极片7h，除去水分和气体，即可得到具有电池隔膜的电池极片，其中隔膜涂敷层为含PVA的SiO2涂层，PVA的质量分数为0.4％，厚度为32μm。
实施例5
一种锂离子电池隔膜的制作方法包括如下步骤：
1)配置涂敷料：将质量分数为5％的PVA(聚乙烯醇)水溶液、CaCO3粉和去离子水以0.8:10:2.375的质量比配置成浆液；
2)涂敷及干燥：将步骤1)所得浆液以18μm的厚度涂敷于钛酸锂极片表面，再将电池极片于40℃下，60％的湿度中干燥8h；
3)重复步骤2)的操作1次；
4)于70℃下真空干燥步骤3)所得电池极片6h，除去水分和气体，即可得到电池极片，其中电池的隔膜涂敷层为含PVA的CaCO3涂层，PVA的质量分数为0.4％，厚度为36μm。
实施例6
一种锂离子电池隔膜的制作方法包括如下步骤：
1)配置涂敷料：将PVDF(聚偏氟乙烯)、α-Al2O3粉和二甲基亚砜(DMSO)以0.04:10:8的质量比配置成浆液；
2)涂敷及干燥：将步骤1)所得浆液以20μm的厚度涂敷于钛酸锂极片表面，再将电池极片于30℃下，50％的湿度中干燥8h；
3)重复步骤2)的操作1次；
4)于70℃下真空干燥步骤3)所得电池极片6h，除去气体，即可得到具有电池隔膜的电池极片，其中涂敷层为含PVDF的Al2O3涂层，PVDF的质量分数为0.4％，厚度为40μm。
实施例7
一种锂离子电池隔膜的制作方法包括如下步骤：
1)配置涂敷料：将PI(聚酰亚胺)、α-Al2O3粉和二甲基亚砜(DMSO)以0.04:10:8的质量比配置成浆液；
2)涂敷及干燥：将步骤1)所得浆液以20μm的厚度涂敷于钛酸锂极片表面， 再将电池极片于30℃下，50％的湿度中干燥8h；
3)重复步骤2)的操作1次；
4)于70℃下真空干燥步骤3)所得电池极片6h，除去气体，即可得到具有隔膜涂敷层的电池极片，其中涂敷层为含PVA的Al2O3涂层，PVA的质量分数为0.4％，厚度为40μm。
以上实施例仅用以说明本发明的技术方案而非对其限制，所属领域的普通技术人员应当理解，参照上述实施例可以对本发明的具体实施方式进行修改或者等同替换，这些未脱离本发明精神和范围的任何修改或者等同替换均在申请待批的权利要求保护范围之内。

Claims (10)

  1. 一种锂离子电池隔膜，其特征在于，所述隔膜包括质量分数为0.2～1％的有机聚合物和无机材料，所述隔膜的厚度为15～60μm。
  2. 根据权利要求1所述的隔膜，其特征在于，所述有机聚合物为聚乙烯醇、聚乙烯、聚丙烯、聚偏氟乙烯、聚酰亚胺、聚环氧乙烷或聚丙烯腈。
  3. 根据权利要求1所述的隔膜，其特征在于，所述无机材料为α-Al2O3、SiO2、CaCO3、ZrO2或TiO2。
  4. 根据权利要求1所述的隔膜，其特征在于，所述有机聚合物的质量分数为0.2～0.6％。
  5. 根据权利要求2所述的隔膜，其特征在于，所述有机聚合物为聚乙烯醇。
  6. 根据权利要求3所述的隔膜，其特征在于，所述无机材料为α-Al2O3。
  7. 根据权利要求4所述的隔膜，其特征在于，所述有机聚合物的质量分数为0.4％。
  8. 根据权利要求1所述的隔膜，其特征在于，所述隔膜的厚度为40μm。
  9. 一种权利要求1所述隔膜的制作方法，其特征在于，所述方法包括如下步骤：
    1)配制涂敷料：将有机聚合物和无机材料溶于溶剂制成浆液状涂敷料；
    2)涂敷及干燥：将步骤1)所得浆液涂敷于电池极片表面至10～20μm厚，于30～50℃和50～80％的湿度下干燥8～12h；
    3)重复步骤2)的操作1～3次；
    4)于70℃下真空干燥步骤3)所得电池极片5～10h。
  10. 根据权利要求9所述的制作方法，其特征在于，步骤2)中所述电池极片于40℃和60％的湿度下干燥8h。
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