TY - JOUR
T1 - A new dual-ion hybrid energy storage system with energy density comparable to that of ternary lithium ion batteries
AU - He, Shenggong
AU - Wang, Shaofeng
AU - Chen, Hedong
AU - Hou, Xianhua
AU - Shao, Zongping
N1 - Publisher Copyright:
© 2020 The Royal Society of Chemistry.
PY - 2020
Y1 - 2020
N2 - Supercapacitors that store energy through dual electrochemical layer capacitance or surface faradaic redox reactions are characterized by their fast charging/discharging capability, high power densities, and long cycling lifetime. However, the low energy density of supercapacitors seriously inhibits their practical applications. Herein, a dual-ion hybrid energy storage system using expanded graphite (EG) as the anion-intercalation supercapacitor-type cathode and graphite@nano-silicon@carbon (Si/C) as the cation intercalation battery-type anode is designed for efficient energy storage. The Si/C anode, synthesized by interfacial adhesion between nanosilicon and graphite with the help of pitch, demonstrates high specific capacity, remarkable cycling stability, and enhanced rate capability. Meanwhile, the EG cathode, which stores energy based on electrochemical double layer capacitance through its unique faradaic pseudocapacitive negative anion intercalation behaviour, demonstrates high energy densities of 462.9-356.5 W h kg-1 at power densities of 403-7130 W kg-1. The resulting Si/C//EG hybrid system delivered highly attractive energy densities of 252-222.6 W h kg-1 at power densities of 215-5420 W kg-1, which are superior to those of conventional electrochemical double layer capacitors and lithium-ion capacitors, making the dual-ion hybrid system a new type of energy storage device capable of achieving fast and efficient energy storage.
AB - Supercapacitors that store energy through dual electrochemical layer capacitance or surface faradaic redox reactions are characterized by their fast charging/discharging capability, high power densities, and long cycling lifetime. However, the low energy density of supercapacitors seriously inhibits their practical applications. Herein, a dual-ion hybrid energy storage system using expanded graphite (EG) as the anion-intercalation supercapacitor-type cathode and graphite@nano-silicon@carbon (Si/C) as the cation intercalation battery-type anode is designed for efficient energy storage. The Si/C anode, synthesized by interfacial adhesion between nanosilicon and graphite with the help of pitch, demonstrates high specific capacity, remarkable cycling stability, and enhanced rate capability. Meanwhile, the EG cathode, which stores energy based on electrochemical double layer capacitance through its unique faradaic pseudocapacitive negative anion intercalation behaviour, demonstrates high energy densities of 462.9-356.5 W h kg-1 at power densities of 403-7130 W kg-1. The resulting Si/C//EG hybrid system delivered highly attractive energy densities of 252-222.6 W h kg-1 at power densities of 215-5420 W kg-1, which are superior to those of conventional electrochemical double layer capacitors and lithium-ion capacitors, making the dual-ion hybrid system a new type of energy storage device capable of achieving fast and efficient energy storage.
UR - http://www.scopus.com/inward/record.url?scp=85079241026&partnerID=8YFLogxK
U2 - 10.1039/c9ta12660k
DO - 10.1039/c9ta12660k
M3 - 文章
AN - SCOPUS:85079241026
SN - 2050-7488
VL - 8
SP - 2571
EP - 2580
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 5
ER -