Novel peapoded Li4Ti5O12 nanoparticles for high-rate and ultralong-life rechargeable lithium ion batteries at room and lower temperatures
Novel peapoded Li4Ti5O12 nanoparticles for high-rate and ultralong-life rechargeable lithium ion batteries at room and lower temperatures
复制标题
新型豆足Li4Ti5O12纳米粒子，用于室温和低温下高倍率和超长寿命可充电锂离子电池
作者：
Peng Liang;Zhang Huijuan;Fang Ling;Zhang Yan;Wang Yu
本文首次设计合成了一种新型豆荚状、高导电性的Li4Ti5O12-C复合材料结构，用于锂离子电池负极材料。在合成过程中，Na2Ti3O7纳米管作为前体和牺牲模板，葡萄糖分子作为绿色碳源，通过简单的水热反应和随后的固态工艺制备出豆荚状的Li4Ti5O12-C复合材料。与之前的报道相比，我们的新策略制备的样品表现出优异的电化学性能，例如出色的倍率能力（在30℃和90℃下分别具有148 mA h g - 1、125 mA h g - 1的极可逆能力）以及出色的循环性能（在10℃下循环5000次后容量损失约5%，容量保留152 mA h g - 1）。低温测试还表明，在不同速率电流下，豆荚状Li4Ti5O12-C复合材料的电化学性能得到了显著改善（在- 25℃的低温下，在10℃下循环500次后，库仑效率可达99%左右）。
In this paper, a novel peapod-like Li4Ti5O12–C composite architecture with high conductivity is firstly designed and synthesized to be used as anode materials for lithium-ion batteries. In the synthesis, Na2Ti3O7 nanotubes act as precursors and sacrificial templates, and glucose molecules serve as the green carbon source, thus the peapod-like Li4Ti5O12–C composite can be fabricated by a facile hydrothermal reaction and the subsequent solid-state process. Compared to the previous reports, the as-prepared samples obtained by our new strategy exhibit excellent electrochemical performances, such as outstanding rate capability (an extremely reversible capability of 148 mA h g−1, 125 mA h g−1 at 30 C and 90 C, respectively) as well as excellent cycling performance (about 5% capacity loss after 5000 cycles at 10 C with 152 mA h g−1 capacity retained). The low-temperature measurements also demonstrate that the electrochemical performances of the peapod-like Li4Ti5O12–C composite are remarkably improved at various rate currents (at the low-temperature of −25 °C, a high Coulombic efficiency of about 99% can be achieved after 500 cycles at 10 C).