High‐Performance All‐Solid‐State Lithium–Sulfur Batteries Enabled by Amorphous Sulfur‐Coated Reduced Graphene Oxide Cathodes
Abstract
Safety and the polysulfide shuttle reaction are two major challenges for liquid electrolyte lithium–sulfur (Li–S) batteries. Although use of solid‐state electrolytes can overcome these two challenges, it also brings new challenges by increasing the interface resistance and stress/strain. In this work, the interface resistance and stress/strain of sulfur cathodes are significantly reduced by conformal coating ≈2 nm sulfur (S) onto reduced graphene oxide (rGO). An Li–S full cell consisting of an rGO@S‐Li10GeP2S12‐acetylene black (AB) composite cathode is evaluated. At 60 °C, the all‐solid‐state Li–S cell demonstrates a similar electrochemical performance as in liquid organic electrolyte, with high rate capacities of 1525.6, 1384.5, 1336.3, 903.2, 502.6, and 204.7 mA h g−1 at 0.05, 0.1, 0.5, 1.0, 2.0, and 5.0 C, respectively. It can maintain a high and reversible capacity of 830 mA h g−1 at 1.0 C for 750 cycles. The uniform distribution of the rGO@S nanocomposite in the Li10GeP2S12‐AB matrix generates uniform volume changes during lithiation/delithiation, significantly reducing the stress/strain, thus extending the cycle life. Minimization of the stress/strain of solid cells is the key for a long cycle life of all‐solid‐state Li–S batteries.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 11, 2017
- Source ID
- 10.1002/aenm.201602923
Entities
People
- Chunsheng Wang
- Fudong Han
- Hongli Wan
- Jean Pierre Mwizerwa
- Ning Huang
- Qiang Zhang
- Xiaoxiong Xu
- Xiayin Yao
Organizations
- Chinese Academy of Sciences
- National Natural Science Foundation of China
- Ningbo Institute of Industrial Technology
- United States Army Research Laboratory
- University of Maryland
- University of Science and Technology of China
- Youth Innovation Promotion Association