Open AccessEfficient Lithium Storage of Si‐Based Anode Enabled by a Dual‐Component Protection Strategy
Author(s) -
Sun Xuan,
Wang Yuyan,
Zhang Yamin,
Hou Linrui,
Yuan Changzhou
Publication year - 2022
Publication title -
advanced energy and sustainability research
Language(s) - English
Resource type - Journals
ISSN - 2699-9412
DOI - 10.1002/aesr.202200028
Subject(s) - anode , materials science , electrolyte , lithium (medication) , carbon fibers , energy storage , electrode , nanotechnology , composite number , chemical engineering , composite material , chemistry , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
Si, as a highly competitive anode material for lithium‐ion batteries (LIBs), has gained enormous commercial interests due to its high theoretical capacity, low delithiation potential, and natural abundance. However, its poor cycling stability/electron conductivity seriously restrains its practical applications. To address this problem well, herein, a scalable spray‐drying method is explored to construct an ultrahigh stable 3D Si‐based composite (designed as Si@C‐MX) anode, where the Ti 3 C 2 T x MXene nanosheets (NSs) crump the nano‐Si coated uniformly with an ultrathin carbon layer. Synergistically, the coating carbon layer and Ti 3 C 2 T x NSs as the conductive elastomer constrain/buffer the volume expansion of nano‐Si, avoid direct contact with the electrolyte, build a continuous electronic network for rapid electron transport, and meanwhile improve mechanical properties of the electrodes. Thanks to the dual protection (i.e., carbon coating and Ti 3 C 2 T x NSs) strategy, the resultant Si@C‐MX anode exhibits large reversible capacities, superior rate capability, and long‐duration cycle stability. Additionally, the Si@C‐MX‐based full batteries delivered an energy density of 371.8 Wh kg −1 based on the whole device at 123.9 W kg −1 and a desirable capacity retention with cycling, which convincingly highlights its promising application in advanced LIBs.