In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 10, No. 18 ( 2022), p. 10004-10013
Abstract:
Regulating the morphology and structure of Si by alloying/dealloying has been proven as an effective way to leverage the Li-storage performance of Si the anode in Li-ion batteries (LIBs). However, the alloying depth is difficult to control and thus the alloy depth-structure relationship is still unclear. Here, we employ the molten-salt electrochemical alloying/dealloying approach to regulate the Li/Si atom ratio (Li x –Si, where x refers to the Li/Si atom ratio and ranges from 1 to 9) to prepare a series of three-dimensional nanoporous Si materials. The obtained nanoporous Si (np-Si-5) shows an outstanding charge capacity of 3276.6 mA h g −1 at 1 A g −1 , a high initial coulombic efficiency of 77.5%, excellent rate performance (reversible capacity of 1074.1 mA h g −1 at 7 A g −1 ), and long cycle stability (reversible capacity of 1012.1 mA h g −1 and capacity retention of 83% at 5 A g −1 after 1000 cycles). Moreover, the np-Si-5 ‖ LiNi 0.6 Co 0.2 Mn 0.2 O 2 full cell delivers a high capacity of 101.2 mA h g −1 and capacity retention of 89% after 150 cycles at 5C. Hence, controlling the Li/Si ratio can mediate the morphology and structure of Si so as to control the Li-storage performance of the Si anode, which sheds light on designing Si-based anodes for high-performance LIBs.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702232-8
