Synthesis of Metal–Organic Sulfides as Anode Materials for Lithium‐Ion Batteries at Room Temperature

Abstract

To relieve the volume effect of metal‐based anode materials for lithium‐ion batteries the size of the active material is reduced to a limit, and organic frameworks are used to provide cushioning for volume expansion. Tin‐based sulfide is designed by 1,3,5‐triazine‐2,4,6‐trithiol trisodium (TMT), and tin dichloride is synthesized at room temperature. TMT like the “solvent” of metal ions has a good electrical conductivity, which makes metal ions disperse in the organic conductive skeleton at the atomic level. A carbon nanotube is introduced to enhance the conductivity among the active particles, and the tin‐based materials deliver a high specific capacity of 713 mAh g−1 at a current density of 500 mA g−1 after 500 cycles. In addition, using Ni2+, Co2+, or Mn2+ instead of Sn2+, the conversion type of the metal‐based anode materials are prepared by the same method, and they also exhibit excellent electrochemical properties.

Nanostructured strategies towards boosting organic lithium-ion batteries

“…Accordingly, the flexible 3D networks of conductive polymer gel were employed to tolerate the huge volume transformation during the electrochemical reaction, thus ensured the expedite transmission and conduction path and kept the anode robust during cycling [141]. In addition, Dai et al [142] reported atomically dispersed metal sulfide anode materials were designed by the 1, 3, 5-triazine-2, 4, 6-trithiol trisodium (TMT) and Sn 2+ loading on CNT networks. TMT is similar to the ''solvent" of metal ions with good conductivity, which makes the ions uniformly dispersed in the organic framework.…”