Porous Coconut Shell Carbon Offering High Retention and Deep Lithiation of Sulfur for Lithium–Sulfur Batteries
- 25 September 2017
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 9 (39), 33855-33862
- https://doi.org/10.1021/acsami.7b09310
Abstract
Retaining soluble polysulfides in the sulfur cathodes and allowing for deep redox are essential to develop high-performance lithium–sulfur batteries. The versatile textures and physicochemical characteristics of abundant biomass offer a great opportunity to prepare biochar materials that can enhance the performance of Li–S batteries in sustainable mode. Here, we exploit micro-/mesoporous coconut shell carbon (CSC) with high specific surface areas as a sulfur host for Li–S batteries. The sulfur-infiltrated CSC materials show superior discharge–charge capacity, cycling stability, and high rate capability. High discharge capacities of 1599 and 1500 mA h g–1 were achieved at current rates of 0.5 and 2.0 C, respectively. A high reversible capacity of 517 mA h g–1 was retained at 2.0 C even after 400 cycles. The results demonstrate a high retention and a deep lithiation of the CSC-confined sulfur. The success of this strategy provides insights into seeking high-performance biochar materials for Li–S batteries from abundant bioresources.Keywords
Funding Information
- National Natural Science Foundation of China (21403050, 21576063)
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