WO2016187811A1 - Lithium ion battery having good thermal safety - Google Patents

Lithium ion battery having good thermal safety Download PDF

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Publication number
WO2016187811A1
WO2016187811A1 PCT/CN2015/079826 CN2015079826W WO2016187811A1 WO 2016187811 A1 WO2016187811 A1 WO 2016187811A1 CN 2015079826 W CN2015079826 W CN 2015079826W WO 2016187811 A1 WO2016187811 A1 WO 2016187811A1
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ion battery
lithium ion
lithium
good thermal
thermal safety
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PCT/CN2015/079826
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French (fr)
Chinese (zh)
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罗明镜
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罗明镜
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Priority to PCT/CN2015/079826 priority Critical patent/WO2016187811A1/en
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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
    • H01M50/443—Particulate material
    • 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
    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • 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 present invention relates to the field of secondary battery technology, and in particular to a lithium ion battery having good thermal safety.
  • the goal of all parties is to design a lithium battery separator.
  • the main function of the diaphragm is to isolate the positive and negative electrodes to prevent self-discharge of the battery and short-circuit of the two poles. Since the working environment of the battery is full of corrosion and temperature changes of the electrolyte, the diaphragm of the lithium ion battery should have superior thermal stability. Sex.
  • the present invention provides a lithium ion battery having good thermal safety, the lithium ion battery comprising a housing and a lithium battery core encapsulated in the housing, the lithium battery core comprising a positive electrode sheet and a negative electrode sheet And a polymer polypropylene separator disposed between the positive electrode sheet and the negative electrode sheet, wherein the polymer polypropylene separator has a thickness of 20 to 30 ⁇ m, and the polymer polypropylene separator has a pore diameter of 0.03 to 0.1 ⁇ m.
  • micropores have a porosity of 30% to 40%; and a layer of Al 2 O 3 /SiO 2 composite ceramic coating having a thickness of 2 to 4 ⁇ m is disposed on both sides of the polymer polypropylene separator; the lithium battery core
  • the positive electrode sheet, the negative electrode sheet, and the high molecular polypropylene separator are wound and formed.
  • micropores are uniformly distributed on the polymer polypropylene membrane.
  • micropores have a small symmetrical shape with two large ends in the middle.
  • the diameter of the largest pore in the micropores is 0.06 to 0.1 ⁇ m, and the diameter at the minimum pore diameter is 0.03 to 0.06 ⁇ m.
  • the thickness of the polymer polypropylene membrane is 20 ⁇ m; and a layer of Al 2 O 3 /SiO 2 composite ceramic coating having a thickness of 4 ⁇ m is disposed on both sides of the polymer polypropylene membrane.
  • the thickness of the high molecular polypropylene separator is 40 ⁇ m; and a layer of Al 2 O 3 /SiO 2 composite ceramic coating having a thickness of 2 ⁇ m is disposed on both sides of the high molecular polypropylene separator.
  • the invention provides a lithium ion battery with good thermal safety, wherein the battery separator comprises a composite ceramic coating, the ceramic coated membrane has superior thermal stability, can effectively improve the thermal safety performance of the lithium ion battery, and prolong The life of a lithium-ion battery.
  • the ceramic coating of the nano-sized particles has a high specific surface area, so that the coated separator has good wettability and liquid retention performance for the electrolyte, and can effectively improve the capacity retention performance of the lithium ion battery.
  • the micropores distributed on the battery separator have a small symmetrical shape with two large ends, which increases the volume of the micropores and further improves the liquid retention performance of the battery separator on the electrolyte.
  • FIG. 1 is a schematic structural view of a lithium ion battery according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural view of a lithium battery core according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural view of a polymer polypropylene separator provided by an embodiment of the present invention.
  • the present embodiment provides a lithium ion battery having good thermal safety, including a housing 1 and a lithium battery cell 2 packaged in the housing 1.
  • the lithium battery cell 2 includes a positive electrode sheet 21, a negative electrode sheet 22, and a high molecular polypropylene separator 23 disposed between the positive electrode sheet 21 and the negative electrode sheet 22.
  • the lithium battery core 2 is composed of the positive electrode sheet 21, The negative electrode sheet 22 and the high molecular polypropylene separator 23 are wound and formed.
  • the polymer polypropylene membrane 23 is uniformly distributed with cylindrical micropores, and the porosity is 30% to 40%; the thickness of the polymer polypropylene membrane 23 can be selected to be 20 to 30 ⁇ m, and the pore diameter of the micropores is 0.03. ⁇ 0.1 ⁇ m.
  • a layer of Al 2 O 3 /SiO 2 composite ceramic coating 24 is disposed on both sides of the polymer polypropylene separator 23, respectively. That is, the positive electrode sheet provided with a layer of Al 2 O 3 / SiO 2 composite ceramic coating 24, the negative electrode and the polymer sheet 22 is also provided with a layer of a polypropylene separator Al 2 O 3 23 23 21 between the separator and the polypropylene polymer /SiO 2 composite ceramic coating 24.
  • the thickness of the composite ceramic coating 24 is preferably in the range of 2 to 4 ⁇ m.
  • a layer of Al 2 O 3 /SiO 2 composite ceramic coating is disposed on both sides of the polymer polypropylene separator, and the ceramic coated separator has superior thermal stability and can effectively improve lithium ion.
  • the thermal safety of the battery extends the life of the lithium-ion battery.
  • the ceramic coating of nano-sized particles has a high specific surface area, so that the coated separator has good wettability and liquid retention property to the electrolyte, and can effectively improve the capacity retention performance of the lithium ion battery, and further extend The life of a lithium-ion battery.
  • the lithium ion battery provided in this embodiment differs from the first embodiment in that, referring to FIG. 3, the micropores 231 distributed on the polymer polypropylene separator 23 have a small symmetrical shape with two large ends in between.
  • the diameter of the largest pore (the middle of the microwell) in the micropores 231 may be selected to be 0.06 to 0.1 ⁇ m, and the diameter of the smallest pore diameter (both ends of the micropores) may be selected to be 0.03 to 0.06 ⁇ m.
  • the micropores on the diaphragm have a small symmetrical shape with two large heads in the middle, which increases the volume of the micropores, and further improves the liquid retaining performance of the battery separator on the electrolyte.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Cell Separators (AREA)
  • Secondary Cells (AREA)

Abstract

Disclosed is a lithium ion battery having good thermal safety. The lithium ion battery comprises a shell and a lithium core encapsulated in the shell; the lithium core comprises a positive plate, a negative plate, and a polymer polypropylene diaphragm arranged between the positive plate and the negative plate, wherein the thickness of the polymer polypropylene diaphragm is 20-30 μm, micropores with apertures of 0.03-0.1 μm are provided on the polymer polypropylene diaphragm, and a porosity of the polymer polypropylene diaphragm is 30%-40%; one Al2O3/SiO2 composite ceramic coatings with thicknesses of 2-4 μm is separately arranged at the two sides of the polymer polypropylene diaphragm; and the lithium core is formed by winding the positive plate, the negative plate, and the polymer polypropylene diaphragm. A lithium ion battery is provided with a diaphragm that is provided with ceramic coatings and has excellent thermal stability, such that the thermal safety performance of the lithium ion battery can be effectively improved, and the service life of the lithium ion battery is prolonged.

Description

具有良好热安全性的锂离子电池Lithium-ion battery with good thermal safety 技术领域Technical field
本发明涉及二次电池技术领域，具体涉及一种具有良好热安全性的的锂离子电池。The present invention relates to the field of secondary battery technology, and in particular to a lithium ion battery having good thermal safety.
背景技术Background technique
二次锂电池因其具有高能量密度等优点，已成为电动车主要能量来源之一。随着电动车动力需求提高，动力电池能量密度提高，电池功率输出需求与尺寸也随之增大，致使在高功率电池运作时会产生更大量的热。由于电解液为非水性且易燃的溶剂，因此，电池内部零件安全性的提升具有绝对必要性，若无法有效率地将热能排除，将造成电池温度上升。Secondary lithium batteries have become one of the main energy sources for electric vehicles because of their high energy density. As the power demand of electric vehicles increases, the energy density of power batteries increases, and the power output requirements and sizes of batteries also increase, resulting in a greater amount of heat when high-power batteries operate. Since the electrolyte is a non-aqueous and flammable solvent, it is absolutely necessary to improve the safety of the internal parts of the battery. If the heat cannot be removed efficiently, the battery temperature will rise.
如何防止电池因过热而导致溶剂起火发生***，安全保证即成为重要课题之一，因此，各方努力研究追求的目标是设计一种锂电池隔膜。隔膜的主要功能是隔离正负极以防止电池自我放电以及两极短路等问题，由于电池的工作环境中充满了电解液的腐蚀和温度的变化，因此，锂离子电池的隔膜应当具有优越的热稳定性。How to prevent the battery from exploding due to overheating, the safety guarantee becomes one of the important issues. Therefore, the goal of all parties is to design a lithium battery separator. The main function of the diaphragm is to isolate the positive and negative electrodes to prevent self-discharge of the battery and short-circuit of the two poles. Since the working environment of the battery is full of corrosion and temperature changes of the electrolyte, the diaphragm of the lithium ion battery should have superior thermal stability. Sex.
发明内容Summary of the invention
有鉴于此，本发明提供了一种具有良好热安全性的锂离子电池，该锂离子电池包括壳体以及封装于所述壳体内的锂电芯，所述锂电芯包括一正极片、一负极片以及设置于所述正极片和负极片之间的高分子聚丙烯隔膜，其中，所述高分子聚丙烯隔膜的厚度为20～30μm，所述高分子聚丙烯隔膜上分布有孔径0.03～0.1μm的微孔，其孔隙率为30％～40％；所述高分子聚丙烯隔膜的两侧分别设置有一层厚度为2～4μm的Al2O3/SiO2复合陶瓷涂层；所述锂电芯由所述正极片、负极片以及高分子聚丙烯隔膜卷绕形成。In view of the above, the present invention provides a lithium ion battery having good thermal safety, the lithium ion battery comprising a housing and a lithium battery core encapsulated in the housing, the lithium battery core comprising a positive electrode sheet and a negative electrode sheet And a polymer polypropylene separator disposed between the positive electrode sheet and the negative electrode sheet, wherein the polymer polypropylene separator has a thickness of 20 to 30 μm, and the polymer polypropylene separator has a pore diameter of 0.03 to 0.1 μm. The micropores have a porosity of 30% to 40%; and a layer of Al 2 O 3 /SiO 2 composite ceramic coating having a thickness of 2 to 4 μm is disposed on both sides of the polymer polypropylene separator; the lithium battery core The positive electrode sheet, the negative electrode sheet, and the high molecular polypropylene separator are wound and formed.
其中，所述微孔在所述高分子聚丙烯隔膜上均匀分布。Wherein the micropores are uniformly distributed on the polymer polypropylene membrane.
其中，所述微孔呈中间大两头小的对称形状。 Wherein, the micropores have a small symmetrical shape with two large ends in the middle.
其中，所述微孔中最大孔径处的直径为0.06～0.1μm，最小孔径处的直径为0.03～0.06μm。Wherein, the diameter of the largest pore in the micropores is 0.06 to 0.1 μm, and the diameter at the minimum pore diameter is 0.03 to 0.06 μm.
其中，所述高分子聚丙烯隔膜的厚度为20μm；所述高分子聚丙烯隔膜的两侧分别设置有一层厚度为4μm的Al2O3/SiO2复合陶瓷涂层。Wherein, the thickness of the polymer polypropylene membrane is 20 μm; and a layer of Al 2 O 3 /SiO 2 composite ceramic coating having a thickness of 4 μm is disposed on both sides of the polymer polypropylene membrane.
其中，所述高分子聚丙烯隔膜的厚度为40μm；所述高分子聚丙烯隔膜的两侧分别设置有一层厚度为2μm的Al2O3/SiO2复合陶瓷涂层。Wherein, the thickness of the high molecular polypropylene separator is 40 μm; and a layer of Al 2 O 3 /SiO 2 composite ceramic coating having a thickness of 2 μm is disposed on both sides of the high molecular polypropylene separator.
本发明提供的具有良好热安全性的的锂离子电池，其中的电池隔膜包含有复合陶瓷涂层，具有陶瓷涂层隔膜具有优越的热稳定性，能有效提高锂离子电池的热安全性能，延长了锂离子电池的寿命。另外，纳米级颗粒的陶瓷涂层，具有较高的比表面积，使得涂覆后的隔膜对电解液具有良好的润湿性及保液性能，能有效提高锂离子电池的容量保持性能。在其中的一个实施例中，电池隔膜上分布的微孔呈中间大两头小的对称形状，增大了微孔的体积，进一步提高了电池隔膜对电解液的保液性能。The invention provides a lithium ion battery with good thermal safety, wherein the battery separator comprises a composite ceramic coating, the ceramic coated membrane has superior thermal stability, can effectively improve the thermal safety performance of the lithium ion battery, and prolong The life of a lithium-ion battery. In addition, the ceramic coating of the nano-sized particles has a high specific surface area, so that the coated separator has good wettability and liquid retention performance for the electrolyte, and can effectively improve the capacity retention performance of the lithium ion battery. In one of the embodiments, the micropores distributed on the battery separator have a small symmetrical shape with two large ends, which increases the volume of the micropores and further improves the liquid retention performance of the battery separator on the electrolyte.
附图说明DRAWINGS
图1是本发明实施例提供的锂离子电池的结构示意图。FIG. 1 is a schematic structural view of a lithium ion battery according to an embodiment of the present invention.
图2是本发明实施例提供的锂电芯的结构示意图。2 is a schematic structural view of a lithium battery core according to an embodiment of the present invention.
图3是本发明实施例提供的高分子聚丙烯隔膜的结构示意图。3 is a schematic structural view of a polymer polypropylene separator provided by an embodiment of the present invention.
具体实施方式detailed description
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行详细地描述，显然，所描述的实施例仅仅是本发明一部分实例，而不是全部实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护范围。The technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
实施例1Example 1
参阅图1和图2，本实施例提供了一种具有良好热安全性的锂离子电池，包括壳体1以及封装于所述壳体1内的锂电芯2。其中，所述锂电芯2包括一正极片21、一负极片22以及设置于所述正极片21和负极片22之间的高分子聚丙烯隔膜23，锂电芯2是由所述正极片21、负极片22以及高分子聚丙烯隔膜23卷绕形成的。 Referring to FIGS. 1 and 2, the present embodiment provides a lithium ion battery having good thermal safety, including a housing 1 and a lithium battery cell 2 packaged in the housing 1. The lithium battery cell 2 includes a positive electrode sheet 21, a negative electrode sheet 22, and a high molecular polypropylene separator 23 disposed between the positive electrode sheet 21 and the negative electrode sheet 22. The lithium battery core 2 is composed of the positive electrode sheet 21, The negative electrode sheet 22 and the high molecular polypropylene separator 23 are wound and formed.
其中，高分子聚丙烯隔膜23上均匀分布有圆柱状的微孔，孔隙率为30％～40％；高分子聚丙烯隔膜23的厚度可以选择的范围是20～30μm，微孔的孔径为0.03～0.1μm。Among them, the polymer polypropylene membrane 23 is uniformly distributed with cylindrical micropores, and the porosity is 30% to 40%; the thickness of the polymer polypropylene membrane 23 can be selected to be 20 to 30 μm, and the pore diameter of the micropores is 0.03. ~0.1μm.
如图2所示的，本实施例中，高分子聚丙烯隔膜23的两侧分别设置有一层Al2O3/SiO2复合陶瓷涂层24。即，正极片21与高分子聚丙烯隔膜23之间设置有一层Al2O3/SiO2复合陶瓷涂层24，负极片22与高分子聚丙烯隔膜23之间也设置有一层Al2O3/SiO2复合陶瓷涂层24。复合陶瓷涂层24的厚度较为优选的范围是2～4μm。As shown in FIG. 2, in the present embodiment, a layer of Al 2 O 3 /SiO 2 composite ceramic coating 24 is disposed on both sides of the polymer polypropylene separator 23, respectively. That is, the positive electrode sheet provided with a layer of Al 2 O 3 / SiO 2 composite ceramic coating 24, the negative electrode and the polymer sheet 22 is also provided with a layer of a polypropylene separator Al 2 O 3 23 23 21 between the separator and the polypropylene polymer /SiO 2 composite ceramic coating 24. The thickness of the composite ceramic coating 24 is preferably in the range of 2 to 4 μm.
本实施例提供的锂离子电池，高分子聚丙烯隔膜的两侧分别设置有一层Al2O3/SiO2复合陶瓷涂层，具有陶瓷涂层隔膜具有优越的热稳定性，能有效提高锂离子电池的热安全性能，延长了锂离子电池的寿命。另外，纳米级颗粒的陶瓷涂层，具有较高的比表面积，使得涂覆后的隔膜对电解液具有良好的润湿性及保液性能，能有效提高锂离子电池的容量保持性能，进一步延长了锂离子电池的寿命。In the lithium ion battery provided by the embodiment, a layer of Al 2 O 3 /SiO 2 composite ceramic coating is disposed on both sides of the polymer polypropylene separator, and the ceramic coated separator has superior thermal stability and can effectively improve lithium ion. The thermal safety of the battery extends the life of the lithium-ion battery. In addition, the ceramic coating of nano-sized particles has a high specific surface area, so that the coated separator has good wettability and liquid retention property to the electrolyte, and can effectively improve the capacity retention performance of the lithium ion battery, and further extend The life of a lithium-ion battery.
实施例2Example 2
本实施例提供的锂离子电池，与实施例1不同的是，参阅图3，分布于高分子聚丙烯隔膜23上的微孔231呈中间大两头小的对称形状。微孔231中最大孔径处(微孔中间)的直径可以选择为0.06～0.1μm，最小孔径处(微孔两端)的直径可以选择为0.03～0.06μm。The lithium ion battery provided in this embodiment differs from the first embodiment in that, referring to FIG. 3, the micropores 231 distributed on the polymer polypropylene separator 23 have a small symmetrical shape with two large ends in between. The diameter of the largest pore (the middle of the microwell) in the micropores 231 may be selected to be 0.06 to 0.1 μm, and the diameter of the smallest pore diameter (both ends of the micropores) may be selected to be 0.03 to 0.06 μm.
本实施例提供的锂离子电池中，隔膜上微孔呈中间大两头小的对称形状，增大了微孔的体积，进一步提高了电池隔膜对电解液的保液性能。In the lithium ion battery provided in this embodiment, the micropores on the diaphragm have a small symmetrical shape with two large heads in the middle, which increases the volume of the micropores, and further improves the liquid retaining performance of the battery separator on the electrolyte.
以上所述仅是本申请的具体实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。 The above description is only a specific embodiment of the present application, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present application. It should be considered as the scope of protection of this application.

Claims (6)

  1. 一种具有良好热安全性的锂离子电池，包括壳体以及封装于所述壳体内的锂电芯，所述锂电芯包括一正极片、一负极片以及设置于所述正极片和负极片之间的高分子聚丙烯隔膜，其中，所述高分子聚丙烯隔膜的厚度为20～30μm，所述高分子聚丙烯隔膜上分布有孔径0.03～0.1μm的微孔，其孔隙率为30％～40％；所述高分子聚丙烯隔膜的两侧分别设置有一层厚度为2～4μm的Al2O3/SiO2复合陶瓷涂层；所述锂电芯由所述正极片、负极片以及高分子聚丙烯隔膜卷绕形成。A lithium ion battery having good thermal safety includes a casing and a lithium battery core encapsulated in the casing, the lithium battery core including a positive electrode sheet, a negative electrode sheet, and disposed between the positive electrode sheet and the negative electrode sheet The polymer polypropylene separator, wherein the polymer polypropylene separator has a thickness of 20 to 30 μm, and the micropores having a pore diameter of 0.03 to 0.1 μm are distributed on the polymer polypropylene separator, and the porosity thereof is 30% to 40 %; the two sides of the high-molecular polypropylene separator are respectively provided with a layer of Al 2 O 3 /SiO 2 composite ceramic coating having a thickness of 2 to 4 μm; the lithium battery core is composed of the positive electrode sheet, the negative electrode sheet and the polymer The propylene membrane is wound to form.
  2. 根据权利要求1所述的具有良好热安全性的锂离子电池，其中，所述微孔在所述高分子聚丙烯隔膜上均匀分布。A lithium ion battery having good thermal safety according to claim 1, wherein said micropores are uniformly distributed on said polymer polypropylene membrane.
  3. 根据权利要求2所述的具有良好热安全性的锂离子电池，其中，所述微孔呈中间大两头小的对称形状。A lithium ion battery having good thermal safety according to claim 2, wherein said micropores have a small symmetrical shape with two large ends in between.
  4. 根据权利要求3所述的具有良好热安全性的锂离子电池，其中，所述微孔中最大孔径处的直径为0.06～0.1μm，最小孔径处的直径为0.03～0.06μm。A lithium ion battery having good thermal safety according to claim 3, wherein a diameter at a maximum pore diameter of said micropores is 0.06 to 0.1 μm, and a diameter at a minimum pore diameter is 0.03 to 0.06 μm.
  5. 根据权利要求4所述的具有良好热安全性的锂离子电池，其中，所述高分子聚丙烯隔膜的厚度为20μm；所述高分子聚丙烯隔膜的两侧分别设置有一层厚度为4μm的Al2O3/SiO2复合陶瓷涂层。The lithium ion battery having good thermal safety according to claim 4, wherein the polymer polypropylene separator has a thickness of 20 μm; and the polymer polypropylene separator is provided with a layer of Al having a thickness of 4 μm. 2 O 3 /SiO 2 composite ceramic coating.
  6. 根据权利要求4所述的具有良好热安全性的锂离子电池，其中，所述高分子聚丙烯隔膜的厚度为40μm；所述高分子聚丙烯隔膜的两侧分别设置有一层厚度为2μm的Al2O3/SiO2复合陶瓷涂层。 The lithium ion battery having good thermal safety according to claim 4, wherein the high molecular polypropylene separator has a thickness of 40 μm; and two sides of the high molecular polypropylene separator are respectively provided with a thickness of 2 μm. 2 O 3 /SiO 2 composite ceramic coating.
PCT/CN2015/079826 2015-05-26 2015-05-26 Lithium ion battery having good thermal safety WO2016187811A1 (en)

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