材料科学
纳米片
阴极
多硫化物
兴奋剂
阳极
电池(电)
涂层
纳米技术
溶解
碳纤维
复合材料
锂(药物)
化学工程
电解质
光电子学
电极
复合数
物理化学
内分泌学
工程类
物理
功率(物理)
化学
医学
量子力学
作者
Xuejun Zhou,Jing Tian,Qingping Wu,Jiulin Hu,Chilin Li
标识
DOI:10.1016/j.ensm.2019.06.009
摘要
Lithium-sulfur (Li-S) battery is one of the most prospective energy storage systems beyond lithium ion battery technologies owing to its super-high theoretical energy density and low cost. However, the dissolution of polysulfide intermediates and low level of sulfur loading still retard the practical application of Li-S batteries. Here, a self-sacrifice templating strategy is reported to synthesize N/O dual-doped hollow carbon microspheres (HCMs) by carbonization of polydopamine coating carbon nitride hollow spheres. The HCM host is constructed by holey nanosheets in shell with a large surface area (873 m2/g) and pore volume (4.84 cm3/g), high N/O doping contents (5.36 and 6.99 atom%). Benefiting from the confinement effect, wetting capability, lithiophilic adsorption and catalytic conversion, HCMs-S cathode enables a reversible capacity around 900 mAh/g at 1–2 C and a retention capacity of 530 mAh/g after 900 cycles. HCMs-S also enables an endurance of high mass and areal S loadings (90% and 4.84 mg/cm2) with a reversible capacity around 700 mAh/g. Long-term and high-rate cycling does not degrade the homogeneous deposition of nanostructured Li2S at cathode side and dendrite-free Li plating at anode side. This work demonstrates a facile approach to micro-sized C-S grains with desirable three-dimensional architecture composed of two-dimensional building blocks and interconnected mass/charge transport channels for high loading Li-S batteries.
科研通智能强力驱动
Strongly Powered by AbleSci AI