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
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[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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