Journal
NANO-MICRO LETTERS
Volume 10, Issue 4, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s40820-018-0213-5
Keywords
Li-Se batteries; N, S-codoped; Graphene; Ultra-lightweight; Free-standing; Vacuum filtration
Funding
- National Natural Science Foundation of China [51125001, 51172005]
- NSFC-RGC Joint Research Scheme [51361165201]
- Start-up Foundation of High-level Talents in Chongqing Technology and Business University [1856008]
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The desire for practical utilization of rechargeable lithium batteries with high energy density has motivated attempts to develop new electrode materials and battery systems. Here, without additional binders we present a simple vacuum filtration method to synthesize [GRAPHICS] nitrogen and sulfur codoped graphene (N,S-G) blocking layer, which is ultra-lightweight, conductive, and free standing. When the N,S-G membrane was inserted between the catholyte and separator, the lithium-selenium (Li-Se) batteries exhibited a high reversible discharge capacity of 330.7 mAh g(-1) at 1 C (1 C = 675 mA g(-1)) after 500 cycles and high rate performance (over 310 mAh g(-1) at 4 C) even at an active material loading as high as similar to 5 mg cm(-2). This excellent performance can be ascribed to homogenous dispersion of the liquid active material in the electrode, good Li+-ion conductivity, fast electronic transport in the conductive graphene framework, and strong chemical confinement of polyselenides by nitrogen and sulfur atoms. More importantly, it is a promising strategy for enhancing the energy density of Li-Se batteries by using the catholyte with a lightweight heteroatom doping carbon matrix.
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