Adenine Derivative Host with Interlaced 2D Structure and Dual Lithiophilic-Sulfiphilic Sites to Enable High-Loading Li-S Batteries
Adenine Derivative Host with Interlaced 2D Structure and Dual Lithiophilic-Sulfiphilic Sites to Enable High-Loading Li-S Batteries
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具有交错二维结构和双亲锂-亲硫位点的腺嘌呤衍生物主体可实现高负载锂硫电池
DOI：
10.1021/acsnano.9b04519
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发表时间：
2019-08-01
期刊：
影响因子：
17.1
通讯作者：
Li, Chilin
中科院分区：
文献类型：
--
作者：
Wu, Qingping;Zhou, Xuejun;Li, Chilin
如何在高硫负载条件下同时抑制活性物种的流失和促进转化反应是解决锂硫电池商业化的关键。对于该系统，原料的可用性和合成策略的简单性（高效率）也是重要因素。在本文中，我们提出了一种交错的二维（2D）碳材料作为先进的锂-硫阴极主体，其特征在于波纹状整体形态和Co/N掺杂剂作为双亲锂-亲硫位点。这种2D结构来自于廉价的生物质前体腺嘌呤，通过简单的离子交换法与MgCl 2水合物模板进行键合相互作用。它允许S/Li 2S沉积物的均匀空间分布和强吸附性以及来自波纹状2D导电基质和嵌入的杂原子/纳米点催化剂的协同效应的增强的转化率，所得硫阴极在0.2 C下释放1290.4mA h g（-1）的高比容量，在2 C下600次循环中每循环0.029%的小容量衰减速率，高达20 C的上级倍率性能，以及即使在高达9.7 mg cm（-2）的硫负载下仍保持6.0 mA h cm（-2）的相当大的面积容量。
How to simultaneously restrain the loss of active species and facilitate the conversion reaction under high S loading condition is the key to solve the commercialization of Li-S batteries. For this system, the availability of raw materials and simplicity (high efficiency) of synthetic strategies are also important factors. Herein, we propose an interlaced two-dimensional (2D) carbon material as advanced Li-S cathode host characterized by corrugated monolithic morphology and Co/N dopants as dual lithiophilic-sulfiphilic sites. This 2D structure is derived from a cheap biomass precursor, adenine, with bonding interaction with a MgCl2 hydrate template via a facile ionothermal method. It allows a homogeneous spatial distribution of S/Li2S deposits and strong adsorbability and enhanced conversion from the synergistic effects of corrugated 2D conductive matrix and embedded heteroatom/nanodot catalyst, the resultant sulfur cathode releases a high specific capacity of 1290.4 mA h g(-1) at 0.2 C, small capacity fading rate of 0.029% per cycle over 600 cycles at 2 C, superior rate performance up to 20 C, and considerable areal capacity retention of 6.0 mA h cm(-2) even under an ultrahigh sulfur loading up to 9.7 mg cm(-2).