Abstract

Li₄Ti₅O₁₂ (LTO) composites modified with carbon nanotubes (CNTs) and carbon coating (LTO@C/CNTs) were synthesized by a simple solid-state reaction. The carbon-coated layers reduce the growth of the primary particles, inhibit interface side reactions and increase electron conductivity, so CNTs-modified LTO can form a conductive network and improve the diffusion path of lithium ions. The LTO@C/CNTs composites show a high-rate capability (150 mAh g⁻¹ at 10 C, 145 mAh g⁻¹ at 20 C) with good cycling performance (90.1% and 82.8% capacity retentions after 1000 cycles at 10 C and 20 C, respectively). In addition, superior electrochemical performance is also demonstrated in a full cell with a LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) cathode and LTO@C/CNTs anode (97.1% capacity retentions after 200 cycles at 1 C). The carbon coating and CNTs-modified in LTO can reduce the polarization of potential difference and charge-transfer resistance, improve the diffusion coefficient of lithium ions, and lead to high rate performance and cycle stability.

中文翻译：

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碳纳米管修饰碳包覆的Li 4 Ti 5 O 12的一步合成及其在Li半电池和LiNi 0.8 Co 0.1 Mn 0.1 O 2 / Li 4 Ti 5 O 12全电池中的应用

摘要

通过简单的固相反应合成了碳纳米管（CNTs）和碳涂层（LTO @ C / CNTs）改性的Li ₄ Ti ₅ O ₁₂（LTO）复合材料。碳涂层减少了一次粒子的生长，抑制了界面副反应并提高了电子传导性，因此CNTs改性的LTO可以形成导电网络并改善锂离子的扩散路径。LTO @ C / CNTs复合材料显示出高速率能力（在10 C下为150 mAh g ^-1，在20 C下为145 mAh g ^-1）和良好的循环性能（在10 C下1000次循环后容量保持率分别为90.1％和82.8％）和20 C）。此外，在具有LiNi _0.8的全电池中也显示出优异的电化学性能Co _0.1 Mn _0.1 O ₂（NCM811）阴极和LTO @ C / CNTs阳极（在1 C下200次循环后，容量保持率达到97.1％）。LTO中改性的碳涂层和CNTs可以减少电势差的极化和电荷转移电阻，提高锂离子的扩散系数，并导致高倍率性能和循环稳定性。