Rational Design of Li3V2(PO4)3/C for Phosphate-Based Symmetric Full-Cell Li-Ion Batteries

被引:1
|
作者
Yoo, Ye-Wan [1 ]
Oh, Hyeong-Seok [1 ]
Lee, Jong-Kyu [1 ]
Yoon, Jung-Rag [2 ]
Lee, Seung-Hwan [1 ]
机构
[1] Department of Battery Convergence Engineering, Kangwon National University, Chuncheon,24341, Korea, Republic of
[2] R&D Center, Samwha Capacitor, Yongin,449-884, Korea, Republic of
来源
Energy Material Advances | 2024年 / 5卷
关键词
Solid-State Batteries;
D O I
10.34133/energymatadv.0147
中图分类号
学科分类号
摘要
To further increase the energy density of lithium-ion batteries (LIBs), various researches have been conducted on high-voltage and high-capacity cathode materials. In this perspective, monoclinic Li3V2(PO4)3 is a promising candidate due to its promising theoretical discharge capacity of 197 mAh/g with complex phase transition in the voltage range of 3.0 to 4.8 V. However, such asymmetric phase transition behavior with 3 Li+ ion extraction/ insertion is highly irreversible, resulting in an initial discharge capacity of 163 mAh/g with deteriorated capacity retention. We suggest that cycling Li3V2(PO4)3 in the voltage range of 3.0 to 4.5 V suppresses the irreversible phase transition and elution of transition metal. Hence, Li3V2(PO4)3 in the voltage range of 3.0 to 4.5 V delivers an initial discharge capacity of about 142 mAh/g and exhibits extremely long cycle retention (78.70% 2,000 cycles), as when cycling in the voltage range of 3.0 to 4.3 V (81.67% 2,000 cycles). Furthermore, we present the possibility of a Li3V2(PO4)3||Li3V2(PO4)3 symmetric all-solid-state battery based on an N/P ratio and a cutoff voltage design, which is demonstrated in liquid electrolyte half-cells and symmetric full cells. Copyright © 2024 Ye-Wan Yoo et al.
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