期刊
JOURNAL OF POWER SOURCES
卷 330, 期 -, 页码 70-77出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.08.128
关键词
Lithium sulfur battery; Sulfur cathode; Mesoporous carbon; Porous silicon; Polysulfide immobilization
资金
- NSF CMMI grant [1334269]
- National Science Foundation Graduate Research Fellowship [1445197]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1263182] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1334269] Funding Source: National Science Foundation
Despite widespread focus on porous carbons for lithium-sulfur battery cathode materials, electrode design to preserve mass-specific performance and sustained extended cycling stability remains a challenge. Here, we demonstrate electrochemically etched porous silicon as a sacrificial template to produce a new class of functional mesoporous carbons optimized for dual chemical and physical confinement of soluble polysulfides in lithium-sulfur battery cathodes. Melt infiltration loading of sulfur at 60 wt% enables initial discharge capacity of 1350 mAh/g(sulfur) at rates of 0.1 C - approaching theoretical capacity of 1675 mAh/g(sulfur). Cycling performance measured at 0.2 C indicates 81% capacity retention measured over 100 cycles with 830 mAh/g(sulfur) capacity. Unlike other carbons, this template combines structural properties necessary for sulfur containment and polysulfide confinement to achieve high specific capacity, but also boasts surface-bound oxygen-containing functional groups that are able to chemically anchor the soluble Li2Sn species on the interior of the mesoporous carbon to sustain cycling performance. In turn, this elucidates a scalable and competitive material framework that is capable, without the addition of additional membranes or inactive anchoring materials, of providing the simultaneous anchoring and confinement effects necessary to overcome performance limitations in lithium sulfur batteries. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据