A Cost‐Effective and Scaleable Approach for the In‐Situ Synthesis of Porous Carbon‐Coated Micrometer‐Sized AlSi Particles as Anode for Lithium‐Ion Batteries

Abstract

Silicon is intensively investigated as one of the most promising lithium-ion battery anode material due to its high theoretical capacity. Here, spherical micro-sized porous AlSi coated by a carbon layer (AlSi@C) are fabricated from low-cost commercial AlSi alloy by delicately controlling an acid etching period, followed by polymerization and carbonization. A small amount of residual Al is beneficial to maintain the spherical morphology and enhance the electrical conductivity of the AlSi anode. Profiting from the porous structure and carbon coating layer, micro-sized porous AlSi@C exhibits a high initial coulombic efficiency of 84.2 %, delivers an initial specific discharge capacity of 1650 mA h g À 1 at a current density of 0.50 A g À 1 , and still retains 824 mA h g À 1 after 300 cycles. This work provides a facile and scalable synthetic strategy for the preparation of porous Sibased anode materials from low-cost AlSi alloy, and it is expected to realize the industrialization of preparation of porous Si-based anode materials.

Improving the Performance of SiOx/Carbon Materials for High Energy Density Commercial Lithium‐Ion Batteries Based on Montmorillonite

“…For example, solar energy can only be generated in the daytime, while wind energy can only be utilized in windy areas. Thus, LIB, as a facile device for energy storage and conversion, has become the core issue of new energy industry and has occupied an important position in modern society . However, its low endurance capacity is far from meeting the demands of the developing new energy industry.…”

“…Thereafter, enough space for the expansion of silicon was provided. In addition, the presence of aluminum further enhanced the conductivity and the rate performance of the anodes . In the work described in the paper, coin lithium ion batteries were assembled using the prepared materials as anodes and commercial ternary material LiNi 0.6 Co 0.2 Mn 0.2 O 2 as cathodes, which showed excellent electrochemical activities.…”

“…Based on Figure a, statistical analyses showed that the size of the MSBC particles varied from 0.06 to 42.25 μm with an average diameter (D50) of 7.83 μm. Such size distribution is among the preferred range for electrode fabrication and is beneficial for compaction of materials and producing high density commercial LIBs . Figure b is the N 2 adsorption/desorption isotherms of the MSBC particles at 77 K, which displayed a typical IV isotherm.…”

“…Thus, LIB, as a facile device for energy storage and conversion, has become the core issue of new energy industry and has occupied an important position in modern society. [1,[6][7] However, its low endurance capacity is far from meeting the demands of the developing new energy industry. Therefore, many efforts have been devoted to improve the energy density of lithium ion battery.…”

“…In addition, the presence of aluminum further enhanced the conductivity and the rate performance of the anodes. [7,34,[38][39] In the work described in the paper, coin lithium ion batteries were assembled using the prepared materials as anodes and commercial ternary material Li-Ni 0.6 Co 0.2 Mn 0.2 O 2 as cathodes, which showed excellent electrochemical activities. Figure 1a presents the diffraction pattern of the prepared silicon-based composite (MSBC).…”