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Positive Electrode And Secondary Battery Including Same Positive Electrode

Abstract: The present invention relates to a positive electrode and a secondary battery including the same and specifically to a positive electrode and a secondary battery including the same comprising: a current collector; a first active material layer which comprises a first active material particle and is disposed on the current collector; and a first pattern and a second pattern which are alternately arranged on the first active material layer while being spaced from each other wherein the first pattern comprises a first pattern active material particle the second pattern comprises a second pattern active material particle the first pattern is thicker than the second pattern and the second pattern has a volume expansion rate larger than that of the first pattern.

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Patent Information

Application #
Filing Date
16 May 2018
Publication Number
02/2019
Publication Type
INA
Invention Field
ELECTRICAL
Status
Email
Parent Application
Patent Number
Legal Status
Grant Date
2023-09-25
Renewal Date

Applicants

LG CHEM, LTD.
128, Yeoui-daero, Yeongdeungpo-gu, Seoul 07336

Inventors

1. JUNG, Hye Ri
LG Chem Research Park, 188, Munji-ro, Yuseong-gu, Daejeon 34122
2. LEE, Jung Pil
LG Chem Research Park, 188, Munji-ro, Yuseong-gu, Daejeon 34122

Specification

1]Mutual citations and related applications [2]This application claims the benefit of priority based on the year 2016 07 04 filed a Korea Patent Application No. 10-2016-0083958 and No. 07 in 2017, filed February 04 Date Korea Patent Application No. 10-2017-0085057, and that Korea everything described in the literature in the patent application is included as part of this specification. [3] [4] Art [5] The present invention, the positive electrode may include a first active material layer, and the first pattern and the second pattern, the thickness of the first pattern on the positive electrode and a secondary battery comprising the same is less than the thickness of the second pattern large, the volume expansion coefficient of the second pattern is characterized by greater than the volume expansion coefficient of the first pattern. BACKGROUND [6] And the demand for the use of alternative energy and clean energy increased due to the rapid increase in the use of fossil fuels, is the development, storage areas are areas that have been studied most actively in that part using an electrochemical reaction. [7] Typical examples include a secondary battery of the present electrochemical device using such an electrochemical energy, and the trend that more and more expanding its area of ​​use. Recently, represents a and rapidly increasing, and such a secondary battery of high energy density and operating potential demand for secondary batteries as an energy source, as a portable computer, a portable telephone, an increase technology development and need for a portable apparatus such as a camera cycle life the long self-discharge rate is a number of studies been performed for low lithium secondary batteries, are also commercially available and widely used. [8] In general, the secondary battery is composed of a positive electrode, a negative electrode, an electrolyte, and a separator, the first lithium ions emitted from the positive electrode active material by the first charge is inserted into the anode active material such as carbon particles, while reciprocating the positive electrode such as to be desorbed back during discharge because it serves to transmit energy it is possible to charge and discharge. [9] The amount of active material, the positive electrode is the most important factor in determining the charge-discharge capacity of the battery. Thus, in order to prepare a high-capacity (high-capacity) electrode, a positive electrode active material has been loaded (loading) at a high level on the collector surface. However, in the case of the active material is loaded at a high level anode, impregnation of the electrolytic solution of the active material layer property (wetting) the charge and discharge of the battery such as a decreases, the rapid charging characteristics of the battery because of the reactivity difference between the electrodes in the thickness direction, the output characteristic performance degradation. [10] In order to solve the above problem, but such a method of increasing the porosity of the active material layer is used, the electrode thickness becomes thick in order to realize the capacity of the same level to the high porosity of the active material layer. Accordingly, there is a problem in designing a cell of high energy density. [11] Therefore, a situation that, while maintaining the high capacity of the battery, it is possible to improve the impregnating property of the electrolyte, the positive electrode can be improved charging and discharging performance of the battery is required. Detailed Description of the Invention SUMMARY [12] One object of the present invention while maintaining a high capacity of the battery, it is possible to improve the impregnating property of the electrolyte, the charge-discharge performance of the battery to provide a cathode which can be improved. [13] Another object of the present invention is to improve the reliability of the battery. Problem solving means [14] In order to achieve the foregoing object, the present invention provides full house; Claim 1 including the active material particles and the first active material layer disposed on the current collector; And the first active material and spaced apart from each other on the layer of the first pattern and comprising a second pattern, the first pattern comprises a first pattern electrode active material particle, the second pattern is a second pattern electrode active material particles arranged alternately comprising a thickness of the first pattern is greater than the thickness of the second pattern, the volume expansion coefficient of the second pattern provides a large positive coefficient of thermal expansion than the volume of the first pattern. [15] Further, the present invention provides a secondary battery comprising the anode. Effects of the Invention [16] In the anode according to the present invention includes a first pattern and a second pattern portion is exposed to the electrolyte solution spaced apart from each other in the first active material layer of high loading, it can improve electrolyte impregnation, and improved charging with the cell capacity a discharge characteristic can be ensured. Further, by adjusting the configuration of the first pattern and the second pattern, it is possible to minimize the thickness of the electrode and improve the mechanical stability of the electrode to relax the stress of the electrode caused during charging and discharging in a pattern layer. Brief Description of the Drawings [17] 1 is a cross-sectional view of a cathode according to an embodiment of the present invention. Mode for the Invention [18] Hereinafter, the present invention will be described to assist understanding of the present invention in more detail. [19] Herein and in the terms or words used in the claims is general and not be construed as limited to the dictionary meanings are not, the inventor can adequately define terms to describe his own invention in the best way on the basis of the principle that the interpreted based on the meanings and concepts corresponding to technical aspects of the present invention. [20] Used herein it is to be used to describe only the exemplary embodiments, and are not intended to limit the present invention. Expression in the singular number include a plural forms unless the context clearly indicates otherwise. [21] In this specification, "it comprise", "comprising is" or "gajida" and terms are exemplary of characteristics, numbers, steps, components or geotyiji to be a combination thereof specify the presence, of one or more other characteristics or more or of numbers, steps, components, or the presence or possibility of combinations thereof and are not intended to preclude. [22] [23] 1, a positive electrode in accordance with one embodiment of the present invention, the current collector; Claim 1 including the active material particles and the first active material layer disposed on the current collector; And the first active material and spaced apart from each other on the layer of the first pattern and comprising a second pattern, the first pattern comprises a first pattern electrode active material particle, the second pattern is a second pattern electrode active material particles arranged alternately including the thickness of the first pattern, and is larger than the thickness of the second pattern, the volume expansion coefficient of the second pattern may be greater than the volume expansion coefficient of the first pattern. [24] [25] The current collector is, as with a conductivity without causing chemical changes in the secondary battery, for example, copper, stainless steel, aluminum, nickel, titanium, sintered carbon, or carbon on the surface of aluminum, stainless steel, nickel, titanium, silver and the like to a surface treatment can be used as such. [26] According to one embodiment of the invention, the first electrode coating portion may be disposed on the current collector. Further, the first pattern and the second pattern may be respectively arranged on the first active material layer. 1, the first electrode coating portion 210 may be arranged evenly spaced over the whole part without the 100 home. The first pattern 220 and second pattern 230 are spaced apart from each other on the first active material layer 210, respectively, may be arranged alternately. Specifically, the concave-convex shape can be formed on the first active material layer is formed by the first pattern and second pattern. [27] In the case of the conventional positive electrode comprising an active material layer loads and there is no concave-convex shape on the surface, as the head in the vicinity of the electrode surface in near full surface of the house, and the amount of the impregnated electrolyte mothayeo significantly reduced, the insertion and desorption of lithium ions do not smoothly the problem that the charge-discharge performance degradation occurred. According to one embodiment of the invention, the first pattern and the according to the concave-convex shape formed by the second pattern, it may be increased in the area of ​​the positive electrode and an electrolyte in contact, it is possible to improve electrolyte impregnation, the charge and discharge of the battery performance this can be improved. Further, as exposed between the first active material layer and the first pattern and the second pattern may be loaded electrolyte is further improved easily be penetrated in the electrolytic solution impregnating property with the collector direction. [28] The thickness of the first pattern may be larger than the thickness of the second pattern. Specifically, the thickness of the first pattern may be a 1.1 times to 2 times the thickness of the second pattern may be a 1.2-fold to 1.5-fold more specifically. [29] Volume expansion coefficient of the second pattern may be greater than the volume expansion coefficient of the first pattern. The volume expansion coefficient can be calculated from the first pattern or the initial thickness than one increase in thickness after the charge and discharge of the second pattern. Specifically, it means the ratio of the change amount of the thickness increase after the first charge-discharge cycle to the initial electrode thickness. At this time, the first charge-discharge cycle proceeds the CC-CV charging to 0.1C, 4.25V to 4.4V, 0.02C Cut off, the discharge is 0.1C, and proceeds by CC discharge at a 3V Cut off. [30] More specifically, there is calculated in the following is the volume expansion coefficient equation 1, to A may be a first pattern or the thickness of the second pattern, to B includes a first pattern or the thickness of the second pattern after the charge-discharge prior to charging and discharging . [31] [Equation 1] [32] Volume expansion ratio = [(BA) / A] × 100 [33] The thickness may be measured, or measured by scanning electron microscopy with a micrometer, Mauser. [34] Thickness because even in the relatively large volume of the small second pattern expansion the thickness of the second pattern relatively small, and may not increase the thickness of the positive transition, or not in contact with the first pattern to the neighboring, even if in contact the excessive stress on the first pattern may not be applied. Thus, the excessive increase of battery thickness due to the positive electrode expansion during charging is prevented, the mechanical stability of the positive electrode can be secured. [35] The first active material layer may include the first electrode active material may include a particle, wherein the first pattern is the first pattern electrode active material may include a particle, and the second pattern and the second pattern electrode active material particle. [36] The first active material particles, the first pattern electrode active material particles, and the second at least one of the composition of the particles of active material patterns may be different from the rest of the composition. [37] According to one embodiment of the invention, the first active material particles and the first pattern electrode active material particle is LiCoO 2 , and the second pattern electrode active material particles LiNi 1 -x1- y1 Co x1 Mn y1 O 2 (0

Documents

Application Documents

# Name Date
1 201817018285-STATEMENT OF UNDERTAKING (FORM 3) [16-05-2018(online)].pdf 2018-05-16
2 201817018285-PRIORITY DOCUMENTS [16-05-2018(online)].pdf 2018-05-16
3 201817018285-POWER OF AUTHORITY [16-05-2018(online)].pdf 2018-05-16
4 201817018285-FORM 1 [16-05-2018(online)].pdf 2018-05-16
5 201817018285-FIGURE OF ABSTRACT [16-05-2018(online)].pdf 2018-05-16
6 201817018285-DRAWINGS [16-05-2018(online)].pdf 2018-05-16
7 201817018285-DECLARATION OF INVENTORSHIP (FORM 5) [16-05-2018(online)].pdf 2018-05-16
8 201817018285-COMPLETE SPECIFICATION [16-05-2018(online)].pdf 2018-05-16
9 201817018285-Power of Attorney-170518.pdf 2018-05-21
10 201817018285-OTHERS-170518.pdf 2018-05-21
11 201817018285-Correspondence-170518.pdf 2018-05-21
12 abstract.jpg 2018-07-02
13 201817018285-RELEVANT DOCUMENTS [30-07-2018(online)].pdf 2018-07-30
14 201817018285-Changing Name-Nationality-Address For Service [30-07-2018(online)].pdf 2018-07-30
15 201817018285.pdf 2018-07-31
16 201817018285-FORM 3 [30-10-2018(online)].pdf 2018-10-30
17 201817018285-Verified English translation (MANDATORY) [15-11-2018(online)].pdf 2018-11-15
18 201817018285-Proof of Right (MANDATORY) [15-11-2018(online)].pdf 2018-11-15
19 201817018285-OTHERS-191118.pdf 2018-11-27
20 201817018285-OTHERS-191118-.pdf 2018-11-27
21 201817018285-Correspondence-191118.pdf 2018-11-27
22 201817018285-Information under section 8(2) (MANDATORY) [07-03-2019(online)].pdf 2019-03-07
23 201817018285-FORM 3 [07-03-2019(online)].pdf 2019-03-07
24 201817018285-Information under section 8(2) (MANDATORY) [04-11-2019(online)].pdf 2019-11-04
25 201817018285-FORM 3 [04-11-2019(online)].pdf 2019-11-04
26 201817018285-FORM 18 [18-03-2020(online)].pdf 2020-03-18
27 201817018285-FORM 3 [06-11-2020(online)].pdf 2020-11-06
28 201817018285-certified copy of translation [09-03-2021(online)].pdf 2021-03-09
29 201817018285-OTHERS [30-03-2021(online)].pdf 2021-03-30
30 201817018285-FER_SER_REPLY [30-03-2021(online)].pdf 2021-03-30
31 201817018285-CLAIMS [30-03-2021(online)].pdf 2021-03-30
32 201817018285-Response to office action [29-06-2021(online)].pdf 2021-06-29
33 201817018285-FER.pdf 2021-10-18
34 201817018285-FORM 3 [29-04-2022(online)].pdf 2022-04-29
35 201817018285-PA [24-11-2022(online)].pdf 2022-11-24
36 201817018285-ASSIGNMENT DOCUMENTS [24-11-2022(online)].pdf 2022-11-24
37 201817018285-8(i)-Substitution-Change Of Applicant - Form 6 [24-11-2022(online)].pdf 2022-11-24
38 201817018285-US(14)-HearingNotice-(HearingDate-31-08-2023).pdf 2023-07-28
39 201817018285-Correspondence to notify the Controller [28-08-2023(online)].pdf 2023-08-28
40 201817018285-Written submissions and relevant documents [08-09-2023(online)].pdf 2023-09-08
41 201817018285-PatentCertificate25-09-2023.pdf 2023-09-25
42 201817018285-IntimationOfGrant25-09-2023.pdf 2023-09-25

Search Strategy

1 SearchstrategyE_28-12-2020.pdf

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3rd: 05 Dec 2023

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