Facile Synthesis of Hybrid Anodes with Enhanced Lithium-Storage Performance Realized by a “Synergistic Effect”

Abstract

Alloying-type anodes including Si- and Sn-based materials are considered the most exploitable anodes for high-performance lithium-ion batteries. However, problems of poor kinetics properties and structural failures such as grain pulverization and coarsening hinder their large-scale application. Herein, SnO2/Si@graphite hybrid anodes, with nano-SnO2 and nano-Si thoroughly mixed with each other and loaded onto graphite flakes, have been prepared by a facile ball milling method. Attributed to the “synergistic effect” between SnO2 and Si, the mechanical stability and kinetics properties can be remarkably enhanced. Furthermore, graphite substrate supplies a fast electrically conductive path and buffers the volume expansion of active particles. Accordingly, SnO2/Si@graphite delivers 798.9 mAh g–1 at 200 mA g–1 and maintains 550.8 mAh g–1 after 1000 cycles at 1 A g–1 in half cells. Impressively, a high energy density of 431.4 Wh kg–1 (based on the mass of anode and cathode) can be obtained in full cells when paired with the NCM622 cathode. This work presents an effective strategy to exploit high-performance alloying-type anodes for LIBs by designing hybrid materials with multiple active components.

Metal–Organic Framework‐Derived SnS2/C/CNT as Anode Material for Lithium‐Ion Batteries with High Capacity and Stability

“…The G and 2D band indicate that the C in the sample has high crystallinity. [22] The SnS 2 content in both samples was further confirmed by thermogravimetric analysis (TGA) (Figure 4f and S4, Supporting Information). The weight loss before 200 °C is related to the evaporation of water in the sample.…”

Effective Encapsulated Strategy throughout Lithiation/Delithiation: Enabling a Stable Interface and Fast Kinetics of Silicon Anode for High-Performance Lithium-Ion Half/Full Batteries

“…In the high-resolution TEM (HR-TEM) image (Figure d), the lattice fringe of ∼0.31 nm in the core part is related to the (111) of polysilicon and a lattice spacing of ∼0.34 nm in the shell part corresponds to the (110) of SnO 2 . Also, the amorphous N-doped carbon is between the Si core and the SnO 2 shell. , Accordingly, selective area electron diffraction (SAED) (Figure e) shows three clear diffraction rings of Si@NC@SnO 2 , revealing the crystal faces of Si (111), (220), and (311) . Based on the above analysis, the core–shell Si@NC@SnO 2 is composed of nano-Si completely encapsulated into a hybrid shell of SnO 2 quantum dots and N-doped carbon, with good thermal and mechanical stability.…”

“…Also, the amorphous N-doped carbon is between the Si core and the SnO 2 shell. 11,27 Accordingly, selective area electron diffraction (SAED) (Figure 2e) shows three clear diffraction rings of Si@NC@SnO 2 , revealing the crystal faces of Si (111), (220), and (311). 27 Based on the above analysis, the core−shell Si@NC@SnO 2 is composed of nano-Si completely encapsulated into a hybrid shell of SnO 2 quantum dots and N-doped carbon, with good thermal and mechanical stability.…”

SiSe2 for Superior Sulfide Solid Electrolytes and Li-Ion Batteries

“…According to previous studies, nanocomposites incorporated with carbonaceous materials have been confirmed to be effective in enhancing the reversibility and reactivity of battery materials. , These nanocomposites increase the ionic and electronic conductivities, enable them to withstand large strains, and accommodate the volume variations of Li-active materials. , Hence, to enhance and optimize the electrochemical performance of SiSe 2 , a SiSe 2 nanocomposite incorporating amorphous carbon was fabricated by using a simple mechanical BM process. The XRD patterns of the SiSe 2 nanocomposite in Figure S11 reveal largely broadened diffraction peaks, indicating the nanocrystalline nature of the SiSe 2 within the nanocomposite.…”