TY - JOUR
T1 - NaV3O8/poly(3,4-ethylenedioxythiophene) composites as high-rate and long-lifespan cathode materials for reversible sodium storage
AU - Ding, Guo-Chun
AU - Zhu, Li-Min
AU - Yang, Qi
AU - Xie, Ling-Ling
AU - Cao, Xiao-Yu
AU - Wang, Yu-Ling
AU - Liu, Jian-Ping
AU - Yang, Xin-Li
PY - 2020/8
Y1 - 2020/8
N2 - Sodium-ion batteries have received a surge of interests for the alternatives to lithium-ion batteries due to their abundant reserves and low cost. The quest of reliable and high-performance cathode materials is crucial to future Na storage technologies. Herein, poly(3,4-ethylenedioxythiophene) (PEDOT) was successfully introduced to NaV3O8 via in situ oxidation polymerization, which can effectively enhance electron conductivity and ionic diffusion of NaV3O8 material. As a result, these NaV3O8@PEDOT composites exhibit a significantly improved electrochemical performance including cycle stability and rate performance. In particular, NaV3O8@20 wt% PEDOT composite demonstrates better dispersibility and lower charge transfer resistance compared with bare NaV3O8, which delivers the first discharge capacity of 142 mAh·g−1 and holds about 128.7 mAh·g−1 after 300 cycles at a current density of 120 mA·g−1. Even at a high current density of 300 mA·g−1, a high reversible capacity of 99.6 mAh·g−1 is revealed. All these consequences suggest that NaV3O8@20 wt% PEDOT composite may be a promising candidate to serve as a high-rate and long-lifespan cathode material for sodium-ion batteries.
AB - Sodium-ion batteries have received a surge of interests for the alternatives to lithium-ion batteries due to their abundant reserves and low cost. The quest of reliable and high-performance cathode materials is crucial to future Na storage technologies. Herein, poly(3,4-ethylenedioxythiophene) (PEDOT) was successfully introduced to NaV3O8 via in situ oxidation polymerization, which can effectively enhance electron conductivity and ionic diffusion of NaV3O8 material. As a result, these NaV3O8@PEDOT composites exhibit a significantly improved electrochemical performance including cycle stability and rate performance. In particular, NaV3O8@20 wt% PEDOT composite demonstrates better dispersibility and lower charge transfer resistance compared with bare NaV3O8, which delivers the first discharge capacity of 142 mAh·g−1 and holds about 128.7 mAh·g−1 after 300 cycles at a current density of 120 mA·g−1. Even at a high current density of 300 mA·g−1, a high reversible capacity of 99.6 mAh·g−1 is revealed. All these consequences suggest that NaV3O8@20 wt% PEDOT composite may be a promising candidate to serve as a high-rate and long-lifespan cathode material for sodium-ion batteries.
KW - High-rate
KW - In situ oxidation polymerization
KW - Long-lifespan
KW - NaVO@PEDOT cathode composites
KW - Sodium-ion batteries
UR - http://www.scopus.com/inward/record.url?scp=85087081525&partnerID=8YFLogxK
U2 - 10.1007/s12598-020-01452-y
DO - 10.1007/s12598-020-01452-y
M3 - Article
AN - SCOPUS:85087081525
SN - 1001-0521
VL - 39
SP - 865
EP - 873
JO - Rare Metals
JF - Rare Metals
IS - 8
ER -