Mingming Chen

Bio: Mingming Chen is an academic researcher from Tianjin University. The author has contributed to research in topics: Carbon & Electrolyte. The author has an hindex of 30, co-authored 88 publications receiving 4889 citations. Previous affiliations of Mingming Chen include Oita University.

In Situ Polymerization of Fluorinated Polyacrylate Copolymer Solid Electrolytes for High-Voltage Lithium Metal Batteries at Room Temperature

Abstract: Poly(ethylene oxide) is a promising solid polymer electrolyte (SPE) matrix. However, its low ionic conductivity, narrow electrochemical window, and sluggish interfacial charge transfer limit its use in solid-state batteries at room temperature. Herein, we report the in situ polymerization of poly(2,2,3,4,4,4-hexafluorobutyl acrylate-copolymer-2-(2-(2-methoxyethoxy) ethoxy)ethyl acrylate) (P(HFBA-co-MEA)) with lithium bis(trifluoromethane sulfonamide) (LiTFSI) to form a fluorinated SPE (P(HFBA-co-MEA)/LiTFSI). When the molar ratio of HFBA to MEA is 1:1, P(HFBA1:1-co-MEA) exhibits a lower lithium-ion absorption energy (−4.602 eV) than that of PMEA (−4.372 eV), providing a fast transport pathway for lithium ions. The electron-absorbing properties of the −C–F group can reduce the lone-pair electron density around the ether-oxygen group and increase the electrochemical window of P(HFBA1:1-co-MEA)/LiTFSI to 4.9 V. In addition, P(HFBA1:1-co-MEA)/LiTFSI demonstrates excellent compatibility with lithium anodes, and the Li|P(HFBA1:1-co-MEA)/LiTFSI|LiNi0.5Co0.3Mn0.2O2 battery has a capacity retention of 62.3% after 170 charge–discharge cycles at 0.1C.

Anatase-TiO2 Nanocoating of Li4Ti5O12 Nanorod Anode for Lithium-Ion Batteries.

Abstract: Li4Ti5O12 nanorods coated by anatase-TiO2 is prepared via a microemulsion consisting of cetyltrimethylammonium bromide, cyclohexane, BuOH, and LiOH to which Ti(OBu)4 is added followed by hydrothermal treatment (autoclave, 180 °C) and calcination at 550 °C in air.

Graphene and Graphene Oxide: Synthesis, Properties, and Applications

Abstract: There is intense interest in graphene in fields such as physics, chemistry, and materials science, among others. Interest in graphene's exceptional physical properties, chemical tunability, and potential for applications has generated thousands of publications and an accelerating pace of research, making review of such research timely. Here is an overview of the synthesis, properties, and applications of graphene and related materials (primarily, graphite oxide and its colloidal suspensions and materials made from them), from a materials science perspective.

Carbon-based Supercapacitors Produced by Activation of Graphene

Abstract: Supercapacitors, also called ultracapacitors or electrochemical capacitors, store electrical charge on high-surface-area conducting materials. Their widespread use is limited by their low energy storage density and relatively high effective series resistance. Using chemical activation of exfoliated graphite oxide, we synthesized a porous carbon with a Brunauer-Emmett-Teller surface area of up to 3100 square meters per gram, a high electrical conductivity, and a low oxygen and hydrogen content. This sp 2 -bonded carbon has a continuous three-dimensional network of highly curved, atom-thick walls that form primarily 0.6- to 5-nanometer-width pores. Two-electrode supercapacitor cells constructed with this carbon yielded high values of gravimetric capacitance and energy density with organic and ionic liquid electrolytes. The processes used to make this carbon are readily scalable to industrial levels.

Laser Scribing of High-Performance and Flexible Graphene-Based Electrochemical Capacitors

Abstract: Although electrochemical capacitors (ECs), also known as supercapacitors or ultracapacitors, charge and discharge faster than batteries, they are still limited by low energy densities and slow rate capabilities. We used a standard LightScribe DVD optical drive to do the direct laser reduction of graphite oxide films to graphene. The produced films are mechanically robust, show high electrical conductivity (1738 siemens per meter) and specific surface area (1520 square meters per gram), and can thus be used directly as EC electrodes without the need for binders or current collectors, as is the case for conventional ECs. Devices made with these electrodes exhibit ultrahigh energy density values in different electrolytes while maintaining the high power density and excellent cycle stability of ECs. Moreover, these ECs maintain excellent electrochemical attributes under high mechanical stress and thus hold promise for high-power, flexible electronics.

Graphene-based composites

Abstract: Graphene has attracted tremendous research interest in recent years, owing to its exceptional properties. The scaled-up and reliable production of graphene derivatives, such as graphene oxide (GO) and reduced graphene oxide (rGO), offers a wide range of possibilities to synthesize graphene-based functional materials for various applications. This critical review presents and discusses the current development of graphene-based composites. After introduction of the synthesis methods for graphene and its derivatives as well as their properties, we focus on the description of various methods to synthesize graphene-based composites, especially those with functional polymers and inorganic nanostructures. Particular emphasis is placed on strategies for the optimization of composite properties. Lastly, the advantages of graphene-based composites in applications such as the Li-ion batteries, supercapacitors, fuel cells, photovoltaic devices, photocatalysis, as well as Raman enhancement are described (279 references).