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In the past few decades, great efforts have been made in exploring advanced active materials with improved electrochemical performances in terms of high energy density, good mechanical/thermal stability, environmental friendliness and low cost for practical applications. To accomplish these goals, combining active materials with other active/inactive materials for complementary strengthening is an efficient approach, among these active materials, carbon materials are of great importance to a range of battery chemistries, because of it is the most versatile element on the periodic table, and its various allotropes make for highly diverse properties and applications. Nowadays, carbonaceous and carbon-containing composite materials have attracted great attention because of their high specific surface area, good active center, adjustable morphology, and excellent mass transfer and diffusion properties. For example, biomass derived carbon had the advantage of being a renewable, low-cost source, and also can provide excellent porous 3D nanostructure. N-doping of carbon have been proven to improve the electrochemical performance, as it enhances the electrical conductivity and also provide more sites. Furthermore, N-doped carbons are synthesized typically using various expensive, toxic N containing precursors following rigorous/complex experimental procedures. In this point, preparation of N-doped carbon from naturally occurring bio waste/ biomass is very appealing as it reduces the environmental pollution, lessens the usage of toxic chemicals and is very inexpensive both in terms of source cost and processing cost. Graphene is regarded as the ideal conductive substrate to disperse and confine active materials because of its excellent conductivity, large specific surface area, robust mechanical strength and remarkable stability. In the field of rechargeable lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs), as the next-generation large-scale energy storage systems, have been widely studied. However, its energy density, power density, and cycle performance are still the main challenges faced by LIBs/SIBs, especially as the anode of the bottleneck. Graphite is the most widely used anode material for commercial lithium-ion batteries because of its flat potential profile, high columbic efficiency, and good cycling stability. However, the relatively low theoretical capacity (372 mAh·g-1) greatly limited the energy density of lithium-ion batteries. To address such issues, many carbonaceous materials with various morphologies and structures have been applied. For instance, porous carbon, carbon nanotubes (CNTs) or reduced graphene oxide, owing to their high conductivity and mechanical strength, are widely employed as matrix to loading the anode materials. Meanwhile, extensive researches have proved that nanostructured materials can effectively enhance electrochemical performance by reducing the diffusion lengths, improving kinetics, and increasing electrolyte contact area. However, because of their high surface energy, the nanostructured materials always tend to aggregation. Nowadays, metal-organic frameworks (MOFs) are a class of crystalline porous materials composed of metal units and organic linkers. MOFs used as promising precursors to construct carbon coated metal-based composites with enhanced individual-particle conductivity for electrocatalysis and energy storage. Moreover, interconnecting isolated MOF derived nanoparticles can enhance interparticle conductivity and accommodate large volume changes during cycles. Transition-metal oxide/sulfide have attracted considerable attention in recent years because of their unique properties and promising applications in electrochemical energy storage and conversion. However, the limited number of active sites and inherent low conductivity severely impair their electrochemical performance. To top it off, the fatal volume changes happened in cycling processes due to the oxidation-reduction reaction could lead to the pulverization and exfoliation of active material. Thus, like almost all transition metal oxygen/chalcogenide showed terrible cyclability, it is the main bottleneck of their application for LIBs/SIBs. Carbon materials had good cycle performance during cycling because of their good conductivity. Therefore, as a load of most negative electrode materials, carbon materials can improve the conductivity and cycle performance of composite materials. Numerous studies showed that the structure of anodes was crucial for good electrochemical performance. Hollow spheres with nanometer-to-micrometer dimensions, controlled internal structure, and shell composition have attracted tremendous attention because of their potential application in catalysis, drug delivery, nanoreactors, energy conversion and storage systems, photonic devices, chemical sensors, and biotechnology. Single-shell and double-shell hollow spheres of various compositions have been synthesized by a number of methods, such as vesicles, emulsions, micelles, gas-bubble, and hard-templating methods. Recently, more efforts have focused on the fabrication of hollow spheres with multiple shells, as these materials are expected to have better properties for applications such as drug release with prolonged release time, heterogeneous catalysis, lithium-ion batteries, and photocatalysis. The construction of three-dimensional (3D) architectures from transition metal oxygen/chalcogenide nanomaterials provides an effective strategy to solve these issues. Generally, these 3D architectures possess large specific surface area which nanosheets can be maintained in the 3D transition metal oxygen/chalcogenide architecture as the restacking of nanosheets is effectively inhibited. Therefore, a great number of electrochemically active sites are exposed to the electrolyte, thus enabling sufficient electrochemical reactions. This paper systematically summarized the types of supported carbon in lithium/sodium ion batteries and the synthesis method of composite materials, starting from the materials commonly used for transition metal oxide/sulfide/selenide and carbon composites for lithium/sodium ion battery anode materials and looking forward to the challenges faced by carbon-loaded anode materials. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.
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Chinese Journal of Rare Metals
ISSN: 0258-7076
Year: 2021
Issue: 10
Volume: 45
Page: 1241-1257
Cited Count:
WoS CC Cited Count: 0
SCOPUS Cited Count: 29
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 5
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