Electrochemical performance of the chalcopyrite CuFeS2 as cathode for lithium ion battery

Ether based electrolyte improves the performance of CuFeS2 spike-like nanorods as a novel anode for lithium storage

“…The formation process could be summarized as follow [21,22] : FeSO 4 +CuSO 4 +Na 2 S 2 O 3 +H 2 O→CuFeS 2 +Na 2 SO 4 +H 2 SO 4 In traditional preparations, Cu + 、(NH 4 ) 2 S are usually used as the raw material [23,24] or organics as the solvents [19,24,25] . As we know, Cu + is more unstable than Fe 2+ within the same system and the cost of production of thiourea is higher than Na 2 S 2 O 3 , so taking advantage of Fe 2+ salt and thiosulfate as raw material is more attractive in consideration of cost.…”

“…As we know, Cu + is more unstable than Fe 2+ within the same system and the cost of production of thiourea is higher than Na 2 S 2 O 3 , so taking advantage of Fe 2+ salt and thiosulfate as raw material is more attractive in consideration of cost. Usually, the reducing atmosphere could be provided by solvents like ethylenediamine [19] . Although it is an effective way to synthesize such kind material, it is not a desirable way due to the organic solvents are unfriendly to the environment.…”

“…The peaks at 1.73 V represents the formation of intermediates, Li x CuFeS 2 [27] . And the cathodic peak at 1.29 V would be ascribed to the conversion reaction: Li x CuFeS 2 +xLi → Cu+Fe+xLi 2 S [17,19] . In the successive cycles (10 cycles), the cathodic peaks at 1.73 V and 1.65 V disappear while the peak at 2.01 V still exists.…”

“…Mostly, it's regard as a kind of additive [17,18] or the cathode for lithium ion batteries [19] without stable cycle performance. How to improve the cycle stability of CuFeS 2 electrode has become a pivotal concern.…”

CuFe2S3 as electrode material for Li-ion batteries

“…In recent years, only a few studies have been reported on chalcopyrite CuFeS 2 , rst as a cathode in a primary battery 16 then as an anode and cathode in a secondary battery.…”