Scientific Reports
·
2025
·Vol. 15
·期 1
·1-14
·
IF 3.9
Wei Aijia,Yang Yuqi,Mu Jinping,He Rui,Li Xiaohui,Zhang Haipeng,Liu Zhenfa,Wang Shasha,Zheng Yong,Mei Shuxing
The instability of the electrode/electrolyte interface and the metal-ions dissolution of high-voltage LiNi 0.5 Mn 1.5 O 4 (LNMO) material lead to significant degradation of cycling performance, thereby limiting the large-scale application of LNMO-based batteries. Here, inorganic Mg/Ca/Sr-contained phosphates (MgHPO 4 , CaHPO 4 , and SrHPO 4 ) are used individually as functional additives of standard electrolytes to enhance the cycling performance of LNMO. Combined with theoretical calculations, a series of electrochemical measurements and characteristics corroborate that the MgHPO 4 is the optimal additive and can preferentially undergo oxidation and reduction decomposition over carbonate solvents. Electrochemical results reveal that the LNMO/Li half-cell containing the MgHPO 4 additive shows a capacity retention of 91.9% after 500 cycles at 5 C, higher than that obtained with STD (76.5%). In addition, the LNMO/graphite (Gr) full-cell with MgHPO 4 additive increases the capacity retention from 70.8 to 78.0% after 100 cycles at 0.5 C. The addition of MgHPO 4 allows a thin, uniform, and conductive cathode-electrolyte interphase (CEI) and solid-electrolyte interphase (SEI) film to be formed on the LNMO cathode and graphite anodes. Furthermore, the preferential reduction of MgHPO 4 inhibits the lithium dendritic growth and enables the formation of a more stable SEI on the Li anode. Besides, the MgHPO 4 additive serves as a scavenger of detrimental HF, thus suppressing the Ni/Mn ions dissolution and improving the structural stability of LNMO. This study provides a cost-effective strategy involving the use of an inorganic additive for improving the electrochemical performance of high-voltage lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 42
·19726-19736
·
IF 3.3
Xingxin Xu,Hualiang Huang
In this work, Ca(H2PO4)2 was used as a green corrosion inhibitor for AZ91D magnesium alloy in 3.5 wt% NaCl solution. The corrosion inhibition behavior and mechanism were analyzed using electrochemical tests, high-definition video measuring microscopy, scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD). The electrochemical testing results showed that the optimal corrosion inhibition concentration of Ca(H2PO4)2 was 0.6 g L−1, and the highest corrosion inhibition efficiency was 89.29% after 48 h immersion in the corrosive medium. Optical microscopy and SEM images showed that an obvious protective film formed on the Mg alloy surface in solution inhibited with Ca(H2PO4)2. EDS and XRD results showed that the protective layer was composed of Mg(OH)2 + MgHPO4 + Ca3PO4, and MgHPO4 played a major role. The precipitation mechanism of Ca(H2PO4)2 as a corrosion inhibitor was proposed.
研究领域:
材料科学
·
电化学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Qiuyue Wang,Fuchao Yang,Daheng Wu,Zhiguang Guo
Water harvesting from fog is of considerable interest as a nominated solution to freshwater shortage in arid and underdeveloped regions. The unique hydrophilic and hydrophobic patterns on the dorsal surface of the Namib Desert Beetle have been shown to be an evolving and effective strategy for harvesting water from air. Illuminated by the Namib desert beetle, different elaborate patterns based on aluminum plates were established and their water harvesting efficiency was investigated from a comparative perspective. The results showed that the vein-like patterned surfaces had the highest (786.15 mg∙cm −2 h −1 ) water collection efficiency. However, the heat released during the condensation process affected the water collection rate. In order to reduce the re-evaporation rate of water droplets, a radiant cooling layer was designed on the other side of the water collection plate to release the condensation heat. The radiation cooling layer employed MgHPO 4 ꞏ0.78 H 2 O as the functional particle and P(VDF-HFP) as the adhesive. Benefitted from radiative cooling layer, the water collection efficiency could be increased by 198.51 mg∙cm −2 h −1 . The water collection material with double-sided function structure has low preparation costs and green raw materials. This work provides an effective way to develop key materials with freshwater harvesting capabilities.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2025
·Vol. 41
·期 2
·333-342
·
IF 3
Lin Huahui,Shen Yu,Wei Li,Song Ran,Wu Fan,Wei Peng,Yang Zhenzhong,Ren Yurong,Qu Ke,Ding Zhengping
Ultra-high nickel layered cathodes (Ni⩾95%) have emerged as prospective candidates for next-generation lithium-ion batteries (LIBs) due to their exceptional specific capacity and cost-effectiveness. However, the commercial application of these cathodes has been hindered by several challenges, including structural instability during cycling, high sensitivity to air, and slow Li + migration. In this research, a one-step modification strategy was developed to simultaneously achieve Mg doping and Li 3 PO 4 layer coating for the ultra-high nickel cathodes. Characterization results demonstrated that Mg doping not only alleviates lattice strain changes during the H2–H3 phase transition (H2: the second hexagonal phase; H3: the third hexagonal phase) but also serves as a structural anchor, preventing Ni 2+ migration and occupation within the Li layer. The Li 3 PO 4 surface coating layer acts as an electrochemical shield, protecting against interfacial side reactions and enhancing the Li + diffusion rate. As a result, the LiNi 0.95 Mn 0.05 O 2 cathode, with both internal and external modifications, demonstrates significant improvement in cycling stability (85.7% capacity retention after 100 cycles) and Li + transport performance (130.6 mA·h·g −1 at 10 C, 1 C=189.6 mA·h·g −1 ), providing a solid foundation for the further development and application of ultra-high nickel cathodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）