单斜晶系
材料科学
阳极
锂(药物)
纳米孔
正交晶系
化学工程
惰性
结晶学
扩散
电导率
储能
离子
纳米技术
分析化学(期刊)
晶体结构
物理化学
热力学
功率(物理)
有机化学
电极
内分泌学
物理
化学
医学
工程类
作者
Wujie Dong,Zichao Liu,Miao Xie,Yongjin Chen,Wenqin Ma,Lihong Song,Yuzhou Bai,Fuqiang Huang
标识
DOI:10.1002/adma.202311424
摘要
Apart from Li4 Ti5 O12 , there are few anode substitutes that can be used in commercial high-power lithium-ion batteries. Orthorhombic T-Nb2 O5 has recently been proven to be another substitute anode. However, monoclinic B-Nb2 O5 of same chemistry is essentially inert for lithium storage, but the underlying reasons are unclear. In order to activate the "inert" B-Nb2 O5 , herein, nanoporous pseudocrystals to achieve a larger specific capacity of 243 mAh g-1 than Li4 Ti5 O12 (theoretical capacity: 175 mAh g-1 ) are proposed. These pseudocrystals are rationally synthesized via a "shape-keep" topological microcorrosion process from LiNbO3 precursor. Compared to pristine B-Nb2 O5 , experimental investigations reveal that B-Nb2 O5-x delivers ≈3000 times higher electronic conductivity and tenfold enhanced Li+ diffusion coefficient. An ≈30% reduction of energy barrier for Li-ion migration is also confirmed by the theoretical calculations. The nanoporous B-Nb2 O5-x delivers unique ion/electron transport channels to proliferate the reversible and deeper lithiation, which activate the "inert" B-Nb2 O5 . The capacitive-like behavior is observed to endow B-Nb2 O5-x ultrafast lithium storage ability, harvesting 136 mAh g-1 at 100 C and 72 mAh g-1 even at 250 C, superior to Li4 Ti5 O12 . Pouch-type full cells exhibit the energy density of ≈251 Wh kg-1 and ultrahigh power density up to ≈35 kW kg-1 .
科研通智能强力驱动
Strongly Powered by AbleSci AI