Boosting fast lithium ion storage of Li4Ti5O12 by synergistic effect of vertical graphene and nitrogen doping

• 来源期刊: 能源化学
• 年，卷（期）: 2020,（12）
• 页码范围: 372-377
• 页数: 6页
• 语种: 英文

摘要

The advancement of power-type lithium ion batteries(LIBs)mainly depends on the construction of elec-trodes with superior electronic & ionic conductivity.In this work,a synergistic combination of nitro-gen doped Li4Ti5O12(N-LTO)nanoparticles and highly conductive vertical graphene(VG)skeleton is pro-posed to obtain ultrafast Li ion storage performance via a facile hydrothermal-nitridation method.The as-synthesized composite nanosheets are composed of interconnected N-LTO shell and VG core to form the final N-LTO/VG core-shell arrays,which are systematically studied as the anodes of LIBs.In virtue of the positive synergistic effect of high conductive VG backbone and nitrogen doping,overwhelming ad-vantages including high specific surface area,superb structural stability and enhanced conductivity are achieved in the well-designed N-LTO/VG electrodes.Accordingly,the as-synthesized N-LTO/VG electrode shows outstanding high rate capacity(142.5 mAh g-1 at 20 C)and superior long-term cycling stability(capacity retention of 98.9％ after 10000 cycles at 5 C),better than LTO/VG electrode without N doping.Our research provides a new strategy for the synthesis of high-performance hybrid electrodes for appli-cation in power-type LIBs.