High areal capacity cathode and electrolyte reservoir render practical Li-S batteries
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发表刊物：
2017
关键字：
Lithium sulfur battery
Electrolyte
High areal capacity
High sulfur loading
Hierachically porous carbon
摘要：
With the considerable development in sulfur cathode, Li-S batteries have recently witnessed a significant
improvement, especially in the gravimetric capacity and cycling performance. However, maintaining high
energy density of Li-S batteries and their commercialization relies on the high areal loading and high utilization
of active material on the electrode, which are always ignored in the most fundamental research reports. For the
Li-S batteries with much higher sulfur loading, except for the well-known issues about polysulfide dissolution,
some new issues such as electron and ion transport in thick cathode, depletion of electrolyte and lithium
dendrite growth need to be addressed. Here, a Li-S battery with a high areal capacity is proposed by a systematic
strategy incorporating two approaches as follows: 1) a hierarchically porous carbon host containing graphene
(G), mesoporous carbon (MPC) and super P (SP) diminishes polysulfide migration and guarantees fast electron
and ion transport in thick cathode; 2) a glass-fiber (GF) membrane severs as the electrolyte reservoir to prevent
the short circuit resulted from the deficiency of liquid electrolyte. With these methods, the Li-S batteries with an
ultrahigh sulfur loading of 13 mg cm−2 provide a high areal capacity of 14.3 mA h cm−2 (1099 mA h g−1) at the
first cycle and stable cycling performance with a reversible capacity of 628 mA h g−1 (8.16 mA h cm−2) after 75
cycles at 0.1 C.
论文类型：
期刊论文
是否译文：
否
收录刊物：
SCI
学位：工学博士学位
职称：实验师
所在单位：冶金与环境学院