Pyritoides additive used in anode of lithium-sulfur battery
A lithium-sulfur battery and additive technology, applied in the field of electrochemistry, can solve the problems of complex synthesis, unfavorable battery capacity and rate performance, and low conductivity, and achieve the effects of convenient preparation, accelerated electrochemical reaction rate, and low price
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Embodiment 1
[0018] Natural pyrite FeS 2 Grinding to millimeter-sized particles, mixed into sulfur / mesoporous carbon composites by co-grinding as cathode materials, in which FeS 2 The mass fraction is 5%. At the same time, a metal lithium sheet is used as the negative electrode, a polyethylene film is used as the diaphragm, and 1,3-dioxolane and ethylene glycol dimethyl ether solution of lithium bis(trifluoromethylsulfonyl)imide are used as the electrolyte to produce lithium sulfur Battery. At a charge-discharge rate of 0.05C, the addition of FeS 2 The initial capacity of the positive electrode reaches 1328mAh / g, and the decay rate of the first 100 cycles is about 0.06%. If FeS 2 Replaced by mesoporous carbon with equal mass, the initial capacity is only 1045mAh / g, and the capacity decay rate is higher (about 0.25%).
Embodiment 2
[0020] Synthesis of CoS on graphene oxide sheets by hydrothermal method 2 , to get the mutually combined CoS 2 - Graphene oxide composite, and then compounded with sulfur to form a positive electrode material, in which CoS 2 The mass fraction is 15%. At the same time, a metal lithium sheet is used as a negative electrode, a polypropylene film is used as a diaphragm, and an ethylene glycol dimethyl ether solution of lithium bis(trifluoromethylsulfonyl)imide and lithium nitrate is used as an electrolyte to manufacture a lithium-sulfur battery. At a charge-discharge rate of 0.5C, the introduction of CoS 2 The initial capacity of the positive electrode reaches 1285mAh / g, and the decay rate of the first 1000 cycles is about 0.04%. If the CoS 2 Replaced by graphene oxide with equal mass, the initial capacity is only 956mAh / g, and the capacity decay rate is higher (about 0.5%).
Embodiment 3
[0022] NiS obtained by co-heating nano-sized nickel and sulfur 2 , co-dispersed with carbon nanotubes in a solvent, assembled by suction filtration, and then compounded with sulfur to obtain a positive electrode, in which NiS 2 The quality score is 50%. At the same time, a lithium-boron alloy is used as the negative electrode, a polypropylene-polyethylene-polypropylene multilayer film is used as the diaphragm, and dimethyl carbonate and diethyl carbonate solutions of lithium hexafluorophosphate are used as the electrolyte to produce a lithium-sulfur battery. At a charge-discharge rate of 2.0C, the addition of NiS 2 The initial capacity of the positive electrode reaches 1054mAh / g, and the decay rate of the first 2000 cycles is about 0.03%. If NiS 2 Replaced by equal mass carbon nanotubes, the initial capacity is only 876mAh / g, and the capacity decay rate is higher (about 0.1%).
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