文献类型：期刊文献

英文题名：Synergistic Enhancement of Pyridinic N-B and Nano-Sandwich Structure on the High Energy Density and Long Cycle Life of Symmetrical Carbon-Based Lithium-Ion Capacitors

作者：Wu, Dichao[1,2] Li, Jiayuan[1,2] Yuying, Zhao[1,2] Wang, Ao[1] Zhu, Haotian[1,2] Zhang, Gaoyue[3] Jiang, Jianchun[1] Fan, Mengmeng[2] Sun, Kang[1]

第一作者：Wu, Dichao

机构：[1] Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material Jiangsu Province, National Engineering Lab for Biomass Chemical Utilization, Key and Open Lab. on Forest Chemical Engineering, SFA, Nanjing, 210042, China; [2] Jiangsu Co-Innovation Center of Efficient Processing, Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China; [3] School of Energy and Environment, Southeast University, Nanjing, 210096, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220373985)

语种：英文

外文关键词：Carbon - Cathodes - Density functional theory - Diffusion barriers - Ions - Lithium - Lithium compounds - Lithium-ion batteries - Nanostructures - Porous materials - Sandwich structures - Solid electrolytes - Storage (materials)

摘要：Carbon-based Lithium-ion capacitors (LICs) are considered as promising energy storages devices with high energy density and power density. However, the mismatch of charge-storage capacity and electrode kinetics between cathode and anode electrodes remains a challenge. In this research, we propose a "Self-assembly-Template" method to prepare B, N co-doped porous carbon (BN-C) with nano-sandwich structure and abundant pyridinic N-B species. The nano-sandwich structure can increase powder density and cycle stability by constructing stable solid electrolyte interphase film, shortening Li+ diffusion pathway and accommodating volume expansion during repeated charging/discharging. The abundant pyridinic N-B species can simultaneously promote the adsorption/desorption of Li+/PF6- and reduce diffusion barrier. The BN-C used as the anode/cathode material promotes the matching of charge-storage capacity and results into high capacity. Owing to the synergistic effect of nano-sandwich structure and pyridinic N-B species, the assembled symmetrical BN-C//BN-C LICs exhibit high energy density of 234.7 W h kg?1, high power density of 39.38 kW kg?1, and excellent cycling stability (91% capacitance retention after 10000 cycles), superior to most of the reported carbon-based LICs. As Density functional theory simulation demonstrated, the pyridinic N-B shows the enhanced adsorption activity for Li+ and PF6-, which is beneficial to increase the capacity of anode and cathode, respectively. Meanwhile, the relatively lower diffusion barrier of pyridinic N-B promote the Li+ migration resulting into good rate performance. Therefore, this work provides a new approach for the synergistic modulation of nano-structure and active site simultaneously to fabricate the cathode/anode dual-appliable electrode material in the LICs application. ? 2022, The Authors. All rights reserved.