Studies on intrinsic phase-dependent electrochemical properties of MnS nanocrystals as anodes for lithium-ion batteries

Abstract

Manganese sulfide (MnS), a member of transition metal sulfides, has been considered as a promising anode material for reversible Li storage due to its high theoretical capacity and structural advantages. However, the intrinsic electrochemical performance of MnS with different phases in lithium-ion batteries is yet to be fully investigated. Herein, high purity rock-salt (RS), zinc-blende (ZB) and wurtzite (WZ) MnS nanocrystals with different morphologies were successfully synthesized via a facile solvothermal method. The RS-MnS, ZB-MnS and WZ-MnS electrodes showed the capacities of 232.5 mAh g -1 , 287.9 mAh g -1 and 79.8 mAh g -1 at the 600th cycle, respectively. ZB-MnS displayed the best performance in terms of specific capacity and cyclability in comparison to RS-MnS and WZ-MnS nanocrystals. Interestingly, all the three kinds of MnS electrodes exhibited an unusual phenomenon of capacity increase upon cycling along with reduced particle sizes and without change in crystallinity. The main contribution of capacity increase was ascribed to the decreased cell resistance and enhanced interfacial charge storage, which facilitated more effective Li + diffusion into electrode materials.

Flexible MnS–Carbon Fiber Hybrids for Lithium‐Ion and Sodium‐Ion Energy Storage

“…The positions of reduction and oxidation peaks, at 0.45 and 1.25 V respectively, are reversible in the following cycles. These peaks indicate that stable electrochemical reactions between MnS and Li + occur, which is proposed to be a conversion reaction in the literature …”

“…While these various graphene‐MnS hybrid results have been reported, little noteworthy effort was made on other types of hybrid. Hybrid electrodes made of carbon fibers embedded with MnS nanoparticles could improve the electrical conductivity of the electrode, buffer volume changes, and form a porous 3D structure beneficial for electrode/electrolyte interface and mechanical stability …”

“…Hybrid electrodes made of carbon fibers embeddedw ith MnS nanoparticlesc ould improve the electricalc onductivity of the electrode,b uffer volumec hanges, andf orm ap orous 3D structure beneficial for electrode/electrolyte interface and mechanical stability. [31,33,[35][36][37][38][39][40][41] In this paper,w es ynthesized af reestanding flexible electrode of MnS nanoparticlese mbedded onto carbon nanofibers by electrospinning, and investigated its electrochemical performances for lithium-ion and sodium-ion energy storage applications.…”

Preparation and Electrochemical Performance of CoSe2−MnSe2 for Application in Lithium‐Ion Batteries

“…The cyclic voltammetry (CV) results of CoSe 2 ‐MnSe 2 @rGO electrode for the first three cycles at a scan rate of 0.1 mV s −1 ranging from 0.01 V to 3 V are shown in Figure a. An irreversible cathode peak appeared in the first cycle, due to the nonaqueous electrolyte decomposition and solid electrolyte interface (SEI) film formed during the discharge process . According to previous reports about transition metal selenide as the anode of lithium‐ion batteries, the discharge process can be summarized as Equations (2)–(4) .…”

“…An irreversible cathode peak appeared in the first cycle, due to the nonaqueous electrolyte decomposition and solid electrolyte interface (SEI) film formed during the discharge process. [32] According to previous reports about transition metal selenide as the anode of lithium-ion batteries, the discharge process can be summarized as Equations (2)-(4). [11,13] According to the subsequent cycles, three cathodic peaks are observed at 1.85 V, 1.35 V, and 0.25 V, respectively.…”