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- Title
A Self-Forming Composite Electrolyte for Solid-State Sodium Battery with Ultralong Cycle Life.
- Authors
Zhang, Zhizhen; Zhang, Qinghua; Shi, Jinan; Chu, Yong S.; Yu, Xiqian; Xu, Kaiqi; Ge, Mingyuan; Yan, Hanfei; Li, Wenjun; Gu, Lin; Hu, Yong‐Sheng; Li, Hong; Yang, Xiao‐Qing; Chen, Liquan; Huang, Xuejie
- Abstract
Replacing organic liquid electrolyte with inorganic solid electrolytes (SE) can potentially address the inherent safety problems in conventional rechargeable batteries. However, solid-state batteries (SSBs) have been plagued by the relatively low ionic conductivity of SEs and large charge-transfer resistance between electrode and SE. Here, a new design strategy is reported for improving the ionic conductivity of SE by self-forming a composite material. An optimized Na+ ion conducting composite electrolyte derived from the Na1+n Zr2Si n P3−n O12 NASICON (Na Super Ionic Conductor) structure is successfully synthesized, yielding ultrahigh ionic conductivity of 3.4 mS cm−1 at 25 °C and 14 mS cm−1 at 80 °C. On the other hand, in order to enhance the charge-transfer rate at the electrode/electrolyte interface, an interface modification strategy is demonstrated by utilization of a small amount of nonflammable and nonvolatile ionic liquid (IL) at the cathode side in SSBs. The IL acts as a wetting agent, enabling a favorable interface kinetic in SSBs. The Na3V2(PO4)3/IL/SE/Na SSB exhibits excellent cycle performance and rate capability. A specific capacity of ≈90 mA h g−1 is maintained after 10 000 cycles without capacity decay under 10 C rate at room temperature. This provides a new perspective to design fast ion conductors and fabricate long life SSBs.
- Subjects
SOLID state batteries; ELECTROLYTES; SODIUM ions; IONIC conductivity; WETTING agents; INTERFACES (Physical sciences); CHARGE transfer
- Publication
Advanced Energy Materials, 2017, Vol 7, Issue 4, pn/a
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201601196