阅读说明：本技术 电极组件和包括其的可再充电电池 (Electrode assembly and rechargeable battery including the same ) 是由 石薰 南重铉 刘喜恩 尹延曦 李圭曙 全卜奎 河在焕 于 2019-03-05 设计创作，主要内容包括：本发明涉及一种电极组件和包括该电极组件的可再充电电池。电极组件可以包括：负电极；正电极；隔膜,介于负电极与正电极之间,并且包括面对负电极的第一表面和面对正电极的第二表面；第一功能层,位于第一表面上,并且包括纤维聚合物和耐热聚合物；以及第二功能层,位于第二表面上,并且包括无机颗粒和有机颗粒。(The present invention relates to an electrode assembly and a rechargeable battery including the same. The electrode assembly may include: a negative electrode; a positive electrode; a separator interposed between the negative electrode and the positive electrode and including a first surface facing the negative electrode and a second surface facing the positive electrode; a first functional layer located on the first surface and comprising a fibrous polymer and a heat-resistant polymer; and a second functional layer located on the second surface and including inorganic particles and organic particles.)

1. An electrode assembly, comprising:

a negative electrode;

a positive electrode;

a separator interposed between the negative electrode and the positive electrode and including a first surface facing the negative electrode and a second surface facing the positive electrode;

a first functional layer located on the first surface and comprising a fibrous polymer and a heat-resistant polymer; and

and a second functional layer on the second surface and including inorganic particles and organic particles.

2. The electrode assembly according to claim 1, wherein the thickness of the first functional layer is 1 μm to 12 μm.

3. The electrode assembly according to claim 1, wherein the first functional layer has a network structure formed by cross-linked spinning or co-spinning.

4. The electrode assembly of claim 1, wherein the first functional layer has a permeability of 60% to 80%.

5. The electrode assembly according to claim 1, wherein the fibrous polymer includes at least one selected from the group consisting of Polyethylene (PE), polypropylene (PP), Polymethylmethacrylate (PMMA), polyvinylidene fluoride (PVdF), polyvinylpyrrolidone (PVP), Polysulfone (PSF), Polystyrene (PS), polyvinyl chloride (PVC), and polyethylene terephthalate (PET).

6. The electrode assembly according to claim 1, wherein the heat-resistant polymer includes at least one selected from the group consisting of Polyimide (PI), Polyetherimide (PEI), polyvinyl alcohol (PVA), Polyacrylonitrile (PAN), Polytetrafluoroethylene (PTFE), polyamide-imide (PAI), Polyetheretherketone (PEEK), Polyethersulfone (PES), and polyphenylene sulfide (PPS).

7. The electrode assembly according to claim 1, wherein the mixing weight ratio of the heat-resistant polymer and the fiber polymer is 5:5 to 8: 2.

8. The electrode assembly according to claim 1, wherein the thickness of the second functional layer is 2 μm to 15 μm.

9. The electrode assembly of claim 1, wherein the inorganic particles comprise at least one of a lithium manganese-based oxide and a lithium iron phosphate-based oxide.

10. The electrode assembly of claim 1, wherein the organic particles comprise polyethylene wax.

11. The electrode assembly according to claim 1, wherein the organic particles have an average particle diameter of 0.5 to 2 μm.

12. The electrode assembly according to claim 1, wherein the amount of the organic particles is 5 to 60 wt% based on the total weight of the second functional layer.

13. The electrode assembly according to claim 1, wherein the separator comprises a substrate or a coated substrate having a coating layer thereon, the substrate comprising at least one selected from the group consisting of polyethylene, polypropylene, polybutylene, polypentene, polytetrafluoroethylene, polyester, polyacetal, polyamide, polycarbonate, polyimide, polyetherimide, polyvinylidene fluoride, polyether ether ketone, polyether sulfone, polyphenylene oxide, polyphenylene sulfide, and polyethylene naphthalene.

14. A rechargeable battery, comprising:

the electrode assembly according to any one of claims 1 to 13; and

and a case accommodating the electrode assembly.

Technical Field

The present disclosure relates to an electrode assembly and a rechargeable battery including the same.

Background

Portable information devices (such as phones, laptop computers, smart phones, etc.) or electric vehicles have used rechargeable lithium batteries with high energy density and portability as driving power sources. Further, research into using a rechargeable lithium battery as a power source for a hybrid vehicle or an electric storage unit by utilizing high energy density characteristics has been actively conducted recently.

One of the main research tasks for rechargeable lithium batteries for vehicles and the like is to improve the safety of the battery. For example, when heat of a rechargeable lithium battery is generated due to overcharge, overdischarge, and a short circuit in the interior of the rechargeable lithium battery, etc., and thus decomposition reaction and thermal runaway of an electrolyte occur, the internal pressure of the battery may suddenly increase to cause explosion of the battery. Among these, since high electric energy stored in each of the short-circuited positive and negative electrodes is rapidly conducted, it is most dangerous that a short circuit occurs inside the rechargeable lithium battery.

Such explosion damages the rechargeable lithium battery and causes fatal damage to users, so that urgent development related to techniques for improving safety of the rechargeable lithium battery is required.

Disclosure of Invention

Technical problem

Drawings

Fig. 1 is a sectional view schematically illustrating an electrode assembly according to an embodiment.

Fig. 2 is a perspective view of a rechargeable lithium battery according to an embodiment.

Fig. 3 is an SEM photograph of a first functional layer prepared according to example 1.

Fig. 4 is an SEM photograph of a first functional layer prepared according to example 2.

Fig. 5 is an SEM photograph of the first functional layer prepared according to comparative example 1.

Fig. 6 is an SEM photograph of the first functional layer prepared according to comparative example 2.

Embodiments provide a rechargeable battery having improved resistance characteristics and improved safety.

Technical scheme

An electrode assembly according to an embodiment may include: a negative electrode; a positive electrode; a separator interposed between the negative electrode and the positive electrode and including a first surface facing the negative electrode and a second surface facing the positive electrode; a first functional layer located on the first surface and comprising a fibrous polymer and a heat-resistant polymer; and a second functional layer located on the second surface and including inorganic particles and organic particles.

A rechargeable battery according to one embodiment may include an electrode assembly and a case accommodating the electrode assembly.

Advantageous effects

According to the embodiment, the disclosed electrode assembly and rechargeable battery including the same may significantly improve the safety of the battery and simultaneously ensure excellent resistance characteristics.