Boost charging lithium-ion battery using expanded graphite anode with enhanced performance

Expanded graphite (EG) for fasting charging was prepared via a facile chemical and thermal exfoliation process. EG specimens yielded through two step exfoliation process for 30, 60, and 90 min (named EG30, EG60, and EG90) served as high-performance anodes for lithium-ion batteries (LIBs). EG60 exhibited the highest specific capacity of 185 mAh g(-1) at an ultrafast charging of 1000 mA g(-1) after 500 cycles. Furthermore, EG60 had an initial specific capacity of 326 mAh g(-1) at 100 mA g(-1 )compared to 247 mAh g(-1) of commercial pristine graphite (PG). EG60 showed the enhanced performance compared to previous reports of EG anodes in LIBs and even other types of metal-based batteries (Na, K-ions batteries). Overall, the results provided a new ideas for enhancing the performance of graphite anode at fast charging attributed to the increased interlayer graphitic spacing with various defects for fast Li ion intercalation. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Expanded graphite (EG) for fast charging was prepared using a facile chemical and thermal exfoliation process, with EG60 exhibiting the highest specific capacity and outperforming commercial pristine graphite (PG) in lithium-ion batteries (LIBs). The results suggest that increased interlayer graphitic spacing with various defects in EG60 contribute to enhanced performance in fast Li-ion intercalation.