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release time:2024-04-15 Hits: Popular:AG11 battery
Hefei Research Institute has made a series of progress in the research of MoS2 no. 7 alkaline battery electrode materials
Recently, the research group of Zhao Bangchuan, a researcher at the Functional Materials Laboratory of the Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, has made a series of progress in the research of MoS2 lithium-ion batteries (LIBs) electrode materials. Relevant research results have been published in ChemElectroChem, Nanoscale, and Small.
Rechargeable lithium-ion batteries have important applications in electric vehicles, portable electronic products, energy storage grids and other fields and have received widespread attention. However, the current commercial graphite anode material cannot meet people's demand for battery energy and power density due to its low theoretical specific capacity (372mAh/g), poor rate performance, and cannot well match the cathode material to obtain the best electrochemistry. performance. In addition, the extremely low working voltage of graphite makes LIBs pose greater safety risks when working. Therefore, exploring anode materials with high safety, high specific capacity, high rate performance and high cycle performance is a hot topic in the current field of LIBs research.
Compared with graphite, materials with two-dimensional/quasi-two-dimensional crystal structures can be used in lithium applications due to their relatively safe operating voltage, larger specific surface area, richer active sites, and rapid ion/electron transfer capabilities. Ion battery anode material. As a typical representative of two-dimensional materials, MoS2 has a graphene-like layered structure and a high theoretical specific capacity (669mAh/g). However, when MoS2 is used as an anode material for LIBs, it has shortcomings such as poor rate performance due to poor conductivity of the material and poor stability due to large volume changes during cycling. In order to solve the above problems, the research team carried out modification research on MoS2 electrode materials and obtained MoS2 electrode materials with superior electrochemical properties.
In order to solve the problem of poor conductivity of MoS2 electrode material, the research team used the metal Co element with high conductivity to composite with MoS2, which effectively improved the conductivity of the material and the electrochemical performance of the material. Even if the MoS2/Co composite electrode Its capacity can still remain above 700mAh/g at a current density of 2A/g. The relevant results were published in ChemElectroChem. In order to further improve the cycle stability of the electrode, V4C3MXene (Mycoene) and MoS2 were used to composite, and combined with the carbon coating process, a V4C3-MXene/MoS2/C composite material was prepared. Since V4C3-MXene can effectively enhance the conductivity of the material and the stability of the electrode structure. Carbon coating can further stabilize the structure of the material and increase the specific surface area of the material, thereby significantly improving the electrochemical performance of the electrode material. The V4C3-MXene/MoS2/C electrode operates at a current density of 1A/g. After 450 cycles, its capacity can reach about 600mAh/g. Even at a current density of 10A/g, the capacity can still be maintained at about 500mAh/g. The relevant results were published in Nanoscale. Compared with the above-mentioned 2H phase MoS2, 1T phase MoS2 has advantages in conductivity and interlayer spacing. However, the current preparation process of 1T phase MoS2 is complicated, and the prepared 1T phase MoS2 is also unstable. The researchers used a glucose-assisted hydrothermal method to synthesize a 1T-MoS2/C material composed of 1T phase MoS2 and carbon with a few-layer structure. The MoS2 composite material had an initial specific capacity of 920.6mAh/g at a current density of 1A/g. The 300-cycle capacity is 870mAh/g, and the specific capacity can still be maintained at around 600mAh/g at a high current density of 10A/g, showing excellent cycle and rate performance. The relevant results were published on Small.
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