Cathode of lithium secondary battery comprising iron oxide, and lithium secondary battery comprising same

A lithium secondary battery, iron oxide technology, applied in secondary batteries, lithium batteries, battery electrodes, etc.

Active Publication Date: 2020-08-14
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0021] Therefore, an object of the present invention is to provide a kind of positive electrode additive for lithium secondary battery that can solve the problem caused by lithium polysulfide

Method used

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  • Cathode of lithium secondary battery comprising iron oxide, and lithium secondary battery comprising same
  • Cathode of lithium secondary battery comprising iron oxide, and lithium secondary battery comprising same
  • Cathode of lithium secondary battery comprising iron oxide, and lithium secondary battery comprising same

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preparation example Construction

[0055] The preparation method of iron oxide

[0056] The preparation method of iron oxide according to the present invention may comprise the following steps:

[0057] (1) Fe(NO 3 ) 3 9H 2 O was dissolved in distilled water to prepare Fe(NO 3 ) 3 9H 2 O aqueous solution;

[0058] (2) drying the Fe(NO 3 ) 3 9H 2 O aqueous solution; and

[0059] (3) For the dry Fe(NO 3 ) 3 9H 2 O is heat-treated to obtain iron oxide represented by the following formula 1:

[0060] [Formula 1]

[0061] Fe x o 3 (where 1.7≤x<2).

[0062] Fe(NO 3 ) 3 9H 2 O is dissolved in an aqueous solvent to prepare an aqueous solution, and preferably, Fe(NO 3 ) 3 9H 2 O is dissolved in deionized water (DIW) or the like. The concentration of the aqueous solution may be 0.5M to 5.0M, preferably 1.0M to 2.0M. If the concentration of the aqueous solution is less than 0.5M, the evaporation rate of the aqueous solution may become slow, and thus, the crystals of the produced iron oxide may b...

preparation example 1

[0120] Preparation example 1: Preparation of Iron Oxide(1)

[0121] Fe(NO 3 ) 3 9H 2 O (Sigma-Aldrich Company) was dissolved in deionized water (DIW) to make a 2.0M aqueous solution. The prepared aqueous solution was dried in a convection oven at 80° C. for 6 hours while sufficiently introducing air. Afterwards, in a convection oven, while fully introducing air, heat treatment was performed at 155 °C for 18 hours to prepare Fe 1.766 o 3 Expressed iron oxide.

preparation example 2

[0122] Preparation example 2: Preparation of Iron Oxide(1)

[0123] Iron oxide was prepared in the same manner as in Preparation Example 1 except that the heat treatment time was 24 hours.

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Abstract

The present invention relates to a cathode of a lithium secondary battery comprising iron oxide as an additive, and a lithium secondary battery comprising same. In the case of a lithium secondary battery comprising a cathode to which iron oxide is applied, the iron oxide absorbs lithium polysulfide (LiPS), which is generated in the process of charging and discharging the lithium secondary battery,thereby increasing charging and discharging efficiency of the battery and improving the longevity thereof.

Description

technical field [0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0082513 filed on July 16, 2018, the entire contents of which are incorporated herein by reference. [0002] The present invention relates to a positive electrode for a lithium secondary battery comprising iron oxide as a positive electrode additive and a lithium secondary battery comprising the same having improved discharge characteristics. Background technique [0003] Since the 1990s, secondary batteries have been important electronic components of portable electronic devices as power storage devices that can be continuously charged and discharged unlike primary batteries that can only be discharged once. In particular, since lithium ion secondary batteries were commercialized by Sony in Japan in 1992, they have ushered in the information age as key components of portable electronic devices such as smart phones, digital cameras, and notebook computers. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M4/38H01M4/36H01M10/052H01M4/02
CPCH01M4/13H01M10/052H01M4/38H01M4/62Y02E60/10H01M4/139H01M4/382H01M10/4235H01M4/625H01M2004/028C01G49/06C01P2002/72C01P2002/74C01P2002/84C01P2006/40C01P2004/64C01P2004/61C01P2004/03C01P2004/50H01M4/131H01M4/133H01M4/134H01M4/525H01M4/621H01M4/661H01M10/0525H01M2004/021
Inventor 韩承勋芮成知
Owner LG ENERGY SOLUTION LTD
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