Wenjia Jiang , Qiaochu Ren , Teli Hu , Hai Hu , Zhifeng Huang , Zhou Li , Shaoxiong Liu , Yi Pei , Li Liu
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引用次数: 0
Abstract
The high specific capacity of the P2-type cathode endowed by the synergistic cation and anion redox makes it one of the most promising cathode materials for sodium-ion batteries (NIBs). However, the structural rearrangement and the irreversible oxygen release under highly desodiated states engender stability issues upon high-capacity operation. Herein, we show specifically how the structural degradation of the P2-type cathode is effectively stabilized by the substitution of bifunctional spectator ions. The rational incorporation of Ti and Si ions triggers the “pillar effect” and “inductive effect”, which eliminates the P2-O2/P2-P2′ structural evolution and mitigates the irreversible oxygen oxidation. Benefited from the highly reversible anion redox, the obtained Na0·67Li0·21Mn0·59Si0·01Ti0·19O2 represents a high reversible capacity of 220 mAh g−1 at 0.1C (20 mA g−1) within a Na-metal half-cell. Ex-situ XRD reveals a solid solution reaction without the formation of additional phases among the charge/discharge process, thus favoring stable cycling performance for up to 200 cycles at 2.5C (with a capacity retention rate of 88 %). This work shows, not only the specific strategies for improving the electrochemical performance of cathode materials, but also offers insights into the intrinsic mechanisms underlying the performance enhancement achieved through spectator ion substitution.
期刊介绍:
The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells.
Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include:
• Portable electronics
• Electric and Hybrid Electric Vehicles
• Uninterruptible Power Supply (UPS) systems
• Storage of renewable energy
• Satellites and deep space probes
• Boats and ships, drones and aircrafts
• Wearable energy storage systems