RARE METALS
·
2023
·Vol. 42
·期 12
·4081-4090
·
IF 8.8
Tan Lei,Chen Peng,Chen Qiao-Yun,Huang Xing,Zou Kang-Yu,Nie Yan-Mei,Li Ling-Jun
Lithium metal anode is considered the alternative to graphite anode due to its ultra-high theoretical capacity of 3860 mAh·g −1 . However, serious Li dendrite growth and drastic electrolyte side reactions restrain the commercial application of Li metal anode. In this work, a Li 3 Bi/LiF interfacial layer is constructed on the surface of the Li metal anode by a spontaneous substitution reaction. The composite interfacial layer possesses excellent ionic conductivity, high mechanical strength, and great electrolyte wettability, which ensures fast Li-ion transfer and uniform Li deposition of the Li 3 Bi/LiF@Li anode. Impressively, the Li 3 Bi/LiF@Li symmetric cell provides a cycle life of more than 400 h with only 73 mV voltage polarization at 10 mA·cm −2 . By pairing with commercial NCM622 cathode, the Li 3 Bi/LiF@Li full cell exhibits a long cycle at a rate of 2 C. Graphical Abstract
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 35
·19046-19055
·
IF 11.9
Huanhuan Duan,Leiping Liao,Ran Bi,Yuanfu Deng,Guohua Chen
Lithium–sulfur (Li–S) batteries configured with solid-state electrolytes (such as poly(ethylene oxide), PEO), featuring high energy density and safety, seem to have become one of the promising next-generation storage devices. Polysulfide shuttle and lithium dendrite formation still need to be tackled in PEO-based lithium sulfur batteries. In this work, we have developed a functional electrolyte additive, viz. MgF2 (or AlF3) with strong Lewis acidity, to resolve the above dilemma. The introduction of MgF2 restricts the migration of polysulfide species by Lewis acid–base interaction and thus, significantly enhances the coulombic efficiency (more than 98.5% @0.05C, 1C = 1675 mA g−1). Also, a robust SEI composed of LiF-rich and LixMg alloy layer is constructed on the anode, inhibiting the brutal growth of lithium dendrites. The MgF2-functional solid-state electrolyte achieves stable lithium plating/stripping cycles up to 500 h at 0.2 mA cm−2 in a Li//Li symmetric battery. A Li–S battery using such a modified PEO-based electrolyte delivers a high capacity of 982 mA h g−1 and enhanced cyclability (90% capacity retention ratio for 40 days' cycles) at 0.05C. This work provides a guideline for the design of high-performance, long-life PEO-based all solid-state Li–S batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuan Gao,Jing Gao,Zhibin Zhang,Yue Wu,Xiaolin Sun,Fuhua Zhao,Yuan Zhang,Depeng Song,Wenyan Si,Qing Zhao,Xun Yuan,Jianfei Wu
Sulfide solid-state electrolytes have garnered considerable attention owing to their notable ionic conductivity and mechanical properties. However, achieving an electrolyte characterized by both high ionic conductivity and a stable interface between the electrode and electrolyte remains challenging, impeding its widespread application. In this work, we present a novel sulfide solid-state electrolyte, Li3.04P0.96Zn0.04S3.92F0.08, prepared through a solid-phase reaction, and explore its usage in all-solid-state lithium sulfur batteries (ASSLSBs). The findings reveal that the Zn, F co-doped solid-state electrolyte exhibits an ionic conductivity of 1.23 × 10–3 S cm–1 and a low activation energy (Ea) of 9.8 kJ mol–1 at room temperature, illustrating the aliovalent co-doping’s facilitation of Li-ion migration. Furthermore, benefiting from the formation of a LiF-rich interfacial layer between the electrolyte and the Li metal anode, the Li/Li3.04P0.96Zn0.04S3.92F0.08/Li symmetrical cell exhibits critical current densities (CCDs) of up to 1 mA cm–2 and maintains excellent cycling stability. Finally, the assembled ASSLSBs exhibit an initial discharge capacity of 1295.7 mAh g–1 at a rate of 0.05 C and at room temperature. The cell maintains a capacity retention of 70.5% for more than 600 cycles at a high rate of 2 C, representing a substantial improvement compared to the cell with Li3PS4. This work provides a new idea for the design of solid-state electrolytes and ASSLSBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2021
·
IF 17.789
Jun Pan,Huili Peng,Yehao Yan,Yuzhou Bai,Jian Yang,Nana Wang,Shixue Dou,Fuqiang Huang
Polymer solid-state batteries (SSBs) possess the advantages of good interfacial contact, but their application faces low ionic conductivity. Here, three-dimensional (3D) porous composite polymer electrolytes with propylene carbonate plasticizer (3D-PPLLP-CPEs) fabricated effectively, displaying high ionic conductivity even at room temperature. Electrochemical in-situ polymerization of 3D-PPLLP-CPEs occurs during the first discharge process, avoiding safety issues caused by the liquid plasticizer without sacrificing the ionic conductivity of the electrolyte. Besides, the controllable in-situ generated LiF-enriched interface can avoid the Li dendrite growth. To further promote the practical value of SSBs, micro-sized Si@Li 3 PO 4 @C with high initial Coulombic efficiency was adopted to replace lithium foil. The LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM111)//Micro Si@Li 3 PO 4 @C full cell has achieved capacity of 129.1 mAh g −1 at a current density of 0.2 C, with capacity retention of 98.5% after 100 cycles, which is the best performance based on the Si anode in SSBs. Even at the high current density of 2.0 A g −1 , the capacity remains 92.5 mAh g −1 . This design of CPEs and electrodes has paved a new way to construct practical SSBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）