Li/CPE/FeS2 rechargeable battery

Enhanced electrochemical performance of FeS2 synthesized by hydrothermal method for lithium ion batteries

“…Figure 3 shows the discharge-charge profiles of a few representative cycles, namely cycle 1, 5, 10, 20, and 30 between 1.2 and 2.6 V at 89 mA g -1 . Both the first discharge curves show an abrupt drop in voltage, followed with a long plateau between 1.4 and 1.45 V. The first discharge plateau is associated with the formation of Fe, Li 2 S, and Li-rich phases depending on the quantity of lithium transfer per FeS 2 [2,34,35]. The subsequent discharge curves differ from the first one, indicating a change in the mechanism of pyrite reduction.…”

“…Iron disulfide (FeS 2 ) is an attractive anode material for lithium ion batteries because of its interesting characteristics such as high theoretic capacity (890 mAh g -1 ), low environmental impact and affordable cost [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. However, the capacities of FeS 2 electrodes often reduce very quickly during charge-discharge cycling, especially at high current densities.…”

Electrochemical verification of the redox mechanism of FeS2 in a rechargeable lithium battery

“…In particular, the Li/FeS 2 primary battery operating at ambient temperature was already commercialized as early as the 1980's [5], and FeS 2 was proven to be highly reversible in rechargeable lithium batteries operated at high temperatures (375-500 C) [6,7]. Other publications have shown that Li/FeS 2 batteries are capable of being cycled up to 500 cycles in a moderate temperature range of 90-130 C by employing a composite polymer electrolyte [8][9][10]. However, the attempts to develop a rechargeable lithium battery at ambient temperature have not been successful due to the poor recyclability of FeS 2 , which was attributed to the different redox mechanism of FeS 2 in nonaqueous electrolytes.…”

“…To date, the redox mechanism of FeS 2 in non-aqueous electrolytes has been poorly understood and is the subject of controversy in a number of publications [3,9,[11][12][13][14]. By analyzing a number of previously reported results and observations, in a recent review we proposed that FeS 2 in rechargeable lithium batteries was subject to the following processes [15]: On the initial discharge, FeS 2 is first converted (reduced) to Li 2 FeS 2 during which the Fe 2+ valance remains unchanged whilst the (SÀ ÀS) 2À bond is broken to form 2S 2À anions (Eq.…”

Electrochemical Properties for Co-Doped Pyrite with High Conductivity

“…In particular, pyrite (FeS2) has attracted a good proportion of research attention and has long been considered one of the most attractive cathode materials for lithium OPEN ACCESS secondary batteries because of its high theoretic capacity (890 mAh·g −1 ), low environmental pollution and affordable cost [4][5][6][7][8]. It is well known that FeS2 is a semiconductor with low conductivity, which may result in poor electrical contact between the active particles and the conductive agent and low electrochemical reaction rate during cycling.…”