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Construction of 3D Electronic/Ionic Conduction Networks for All‐Solid‐State Lithium Batteries
Author(s) -
Wan Hongli,
Cai Liangting,
Han Fudong,
Mwizerwa Jean Pierre,
Wang Chunsheng,
Yao Xiayin
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201905849
Subject(s) - ionic bonding , lithium (medication) , solid state , materials science , ionic conductivity , thermal conduction , nanotechnology , chemical physics , chemical engineering , ion , chemistry , electrode , composite material , organic chemistry , engineering , electrolyte , medicine , endocrinology
Abstract High and balanced electronic and ionic transportation networks with nanoscale distribution in solid‐state cathodes are crucial to realize high‐performance all‐solid‐state lithium batteries. Using Cu 2 SnS 3 as a model active material, such a kind of solid‐state Cu 2 SnS 3 @graphene‐Li 7 P 3 S 11 nanocomposite cathodes are synthesized, where 5–10 nm Cu 2 SnS 3 nanoparticles homogenously anchor on the graphene nanosheets, while the Li 7 P 3 S 11 electrolytes uniformly coat on the surface of Cu 2 SnS 3 @graphene composite forming nanoscaled electron/ion transportation networks. The large amount of nanoscaled triple‐phase boundary in cathode ensures high power density due to high ionic/electronic conductions and long cycle life due to uniform and reduced volume change of nano‐Cu 2 SnS 3. The Cu 2 SnS 3 @graphene‐Li 7 P 3 S 11 cathode layer with 2.0 mg cm −2 loading in all‐solid‐state lithium batteries demonstrates a high reversible discharge specific capacity of 813.2 mAh g −1 at 100 mA g −1 and retains 732.0 mAh g −1 after 60 cycles, corresponding to a high energy density of 410.4 Wh kg −1 based on the total mass of Cu 2 SnS 3 @graphene‐Li 7 P 3 S 11 composite based cathode. Moreover, it exhibits excellent rate capability and high‐rate cycling stability, showing reversible capacity of 363.5 mAh g −1 at 500 mA g −1 after 200 cycles. The study provides a new insight into constructing both electronic and ionic conduction networks for all‐solid‐state lithium batteries.