Multiscale control of MnO_(2) growth via[WO_(6)]-perturbed[MnO_(6)]assembly toward a favorable balance between capacitance and rate performance  

作　　者：Jin-Kang Liu Tian-Shuo Yang Zhi-Bin Ren Adekunle-Adedapo Obisanya Xin-Yi Tan Yan-Di Rao Jun-Shuang Zhou Fa-Ming Gao Jian-Ren Wang 

机构地区：[1]Hebei Key Laboratory of Applied Chemistry,Yanshan University,Qinhuangdao,066004,China

出　　处：《Rare Metals》2024年第4期1658-1671,共14页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.22105164 and 21875205);the National Natural Science Foundation of Hebei Province(No.B2022203009);Hebei Province Foundation for the National Natural Science Foundation(No.206Z4404G);the subsidy for Hebei Key Laboratory of Applied Chemistry after Operation Performance(No.22567616H)。

摘　　要：Although pseudocapacitive manganese dioxide(MnO_(2))integrates the high-power merit of carbonaceous materials with the high-energy merit of battery-type materials,it still has a long way to go in achieving a more satisfactory balance of higher energy and power density,and in decoupling the relationship of structural characteristics with energy storage performance.To realize such goals,a bottom-up[WO_(6)]-perturbed[MnO_(6)]assembly strategy has been developed here due to their similar structure,yet mismatched lattice parameters.This facile protocol is capable of finely controlling the morphology and crystal structure of MnO_(2)by adjusting its internal[WO_(6)]concentration.Therefore,the as-prepared W_xMnO_(2)is treated as an ideal platform to scrutinize the correlations of the structure with the energy storage performance.The operando Raman spectra and finite element analysis have fully demonstrated the superiority of the locally ordered defects-enriched structure of W_(0.02)-MnO_(2),which could reach a favorable balance between the ion diffusion equilibrium time and the number of active sites.As a result,the W_(0.02)-MnO_(2)is able to deliver a high capacitance of 292 F·g^(-1)at a current density of 1 A·g^(-1)and a remarkable rate performance with a 60%capacity retention at a current density of 50 A·g^(-1).The further unveiled structure-performance relationship provides a guideline for the design of better pseudocapacitive energy storage devices.

关 键 词：SUPERCAPACITORS Pseudocapacitive materials MnO_(2) Tungsten doping Crystal structure regulation 

分 类 号：TQ137.12[化学工程—无机化工] TM53[电气工程—电器]