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- Title
Self-Regulating Interfacial Space Charge through Polyanion Repulsion Effect towards Dendrite-Free Polymer Lithium-Metal Batteries.
- Authors
Manying Cui; Na Gao; Wenshan Zhao; Hongyang Zhao; Zhenjiang Cao; Yanyang Qin; Guoxin Gao; Kai Xi; Yaqiong Su; Shujiang Ding
- Abstract
Uncontrolled transport of anions leads to many issues, including concentration polarization, excessive interface side reactions, and space charge-induced lithium dendrites at the anode/electrolyte interface, which severely deteriorates the cycling stability of lithium metal batteries. Herein, an asymmetrical polymer electrolyte modified by a boron-containing single-ion conductor (LiPVAOB), is designed to inhibit the nonuniform aggregation of free anions in the vicinity of the lithium anode through the repulsion effect improving the lithium-ion transference number to 0.63. This LiPVAOB exerts a repulsion interaction with free anions even at a long distance and a selective effect for free anions transport, which diminishes uneven aggregation of free anions at the interface and suppresses space charges-induced lithium dendrites growth. Consequently, the assembled Li||Li cell delivers an ultra-long cycle for over 5400 h. The Li||LiFePO4 cell exhibits outstanding cycle performance with a capacity retention of 93% over 4500 cycles. In particular, the assembled high-voltage Li||Li1.2Ni0.2Mn0.6O2 cell (charged to 4.8 V) exhibits good cycle stability with a high specific capacity of 245 mAh g-1. This designed polymer electrolyte provides a promising strategy for regulating ion transport to inhibit space charge-induced lithium dendrite growth for high-performance lithium metal batteries.
- Subjects
SPACE charge; POLYANIONS; POLYMERS; DENDRITIC crystals; LITHIUM cells; POLYELECTROLYTES
- Publication
Advanced Energy Materials, 2024, Vol 14, Issue 13, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.202303834