Method for preparing iron sulfide, cathode comprising iron sulfide prepared thereby for lithium secondary battery, and lithium secondary battery comprising same

A lithium secondary battery and iron sulfide technology, applied in secondary batteries, iron sulfide, lithium storage batteries, etc., can solve problems such as complicated methods and sulfur limitation, and achieve the effect of suppressing side reactions and improving reactivity

Pending Publication Date: 2021-02-19
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] Although such efforts are ongoing, these methods are not only complicated, but also have the problem that the amount of sulfur that can be added as an active material is limited

Method used

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  • Method for preparing iron sulfide, cathode comprising iron sulfide prepared thereby for lithium secondary battery, and lithium secondary battery comprising same
  • Method for preparing iron sulfide, cathode comprising iron sulfide prepared thereby for lithium secondary battery, and lithium secondary battery comprising same
  • Method for preparing iron sulfide, cathode comprising iron sulfide prepared thereby for lithium secondary battery, and lithium secondary battery comprising same

Examples

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preparation example Construction

[0048] The preparation method of iron sulfide

[0049] According to the iron sulfide (FeS 2 ) comprises the steps of: (1) mixing an iron precursor and a sulfur precursor to form a mixture, and (2) heat-treating the mixture in an inert gas atmosphere.

preparation example 1

[0104] Preparation Example 1: Preparation of Iron Sulfide

[0105] 1.9 g ferric nitrate hydrate (Fe(NO 3 ) 3 9H 2 O) (Sigma-Aldrich company) and 3.6g thiourea (CH 4 N 2 S) (Sigma-Aldrich) mixed (Fe:S=1:10 (molar ratio)).

[0106]While flowing argon gas at a flow rate of 100 mL / min, the mixture was heat-treated at 400° C. for 1.5 hours. At this time, the rate of temperature increase in the heat treatment was 10° C. / min. Iron sulfide (FeS 2 ).

preparation example 2

[0107] Preparation Example 2: Preparation of Iron Sulfide

[0108] In addition to using 0.42 g of ferric hydroxide (γ-FeOOH) instead of ferric nitrate hydrate (Fe(NO 3 ) 3 9H 2 O) Except for the iron precursor, iron sulfide (FeS 2 ).

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Abstract

The present invention relates to: a method for preparing iron sulfide (FeS2), which is selective for and allows high-purity iron sulfide to be prepared in a simple process; a cathode containing iron sulfide (FeS2) for a lithium secondary battery, in which iron sulfide (FeS2) adsorbs lithium polysulfide generated during charging and discharging processes of the lithium secondary battery, thereby enabling the battery to increase in charge and discharge efficiency and to improve in lifespan characteristic; and a lithium secondary battery comprising same.

Description

technical field [0001] This application is based on Korean Patent Application No. 10-2018-0111788 filed on September 18, 2018, Korean Patent Application No. 10-2019-0114771 filed on September 18, 2019, and Korean Patent Application No. 10-2019-0114771 filed on September 18, 2018. The benefit of priority of Korean Patent Application No. 10-2018-0111792 and Korean Patent Application No. 10-2019-0114782 filed on September 18, 2019, the entire contents of which are incorporated herein by reference. [0002] The present invention relates to a method for preparing iron sulfide, a positive electrode for a lithium secondary battery comprising the iron sulfide prepared therefrom, and a lithium secondary battery provided with the positive electrode, and more particularly to a positive electrode additive usable as a lithium secondary battery iron sulfide (FeS 2 ) preparation method capable of selectively producing high-purity iron sulfide that can be used as a positive electrode additiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/36H01M4/38H01M10/052C01G49/12
CPCC01G49/12H01M4/13H01M4/38H01M10/052C01P2004/03C01P2002/72C01P2006/40H01M2004/028H01M4/628Y02E60/10C01P2002/74C01P2004/61C01P2004/62H01M4/364H01M4/5815H01M4/587H01M10/0525H01M2004/021
Inventor 芮成知韩承勋
Owner LG ENERGY SOLUTION LTD
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