Small
·
2023
·Vol. 20
·期 2
·2305639
·
IF 13.3
Shiwei Xu,Qiu Fang,Jipeng Wu,Suting Weng,Xiaoyun Li,Qiuyan Liu,Qiyu Wang,Xiqian Yu,Liquan Chen,Yejing Li,Zhaoxiang Wang,Xuefeng Wang
Prelithiation is an essential technology to compensate for the initial lithium loss of lithium-ion batteries due to the formation of solid electrolyte interphase (SEI) and irreversible structure change. However, the prelithiated materials/electrodes become more reactive with air and electrolyte resulting in unwanted side reactions and contaminations, which makes it difficult for the practical application of prelithiation technology. To address this problem, herein, interphase engineering through a simple solution treatment after chemical prelithiation is proposed to protect the prelithiated electrode. The used solutions are carefully selected, and the composition and nanostructure of the as-formed artificial SEIs are revealed by cryogenic electron microscopy and X-ray photoelectron spectroscopy. The electrochemical evaluation demonstrates the unique merits of this artificial SEI, especially for the fluorinated interphase, which not only enhances the interfacial ion transport but also increases the tolerance of the prelithiated electrode to the air. The treated graphite electrode shows an initial Coulombic efficiency of 129.4%, a high capacity of 170 mAh g −1 at 3 C, and negligible capacity decay after 200 cycles at 1 C. These findings not only provide a facile, universal, and controllable method to construct an artificial SEI but also enlighten the upgrade of battery fabrication and the alternative use of advanced electrolytes.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Haoou Ruan,Xiang Yu,Yunpeng Liu,Yixiao Zhang,Sidi Fan,Fangcheng Lv
Aramid nanofibers (ANFs)-based composites have attracted considerable interest in electronic and electrical engineering due to their exceptional thermal stability, high strength, and superior insulating properties. However, the performance of ANFs-based composites is severely confined by interfacial issues. Accordingly, a novel strategy of fluorinated interface engineering is proposed herein, by which the fillers are grafted by the fluorine-containing functional groups. The introduction of interfacial fluorination yields a dense and compact composite structure which stems from the improved compatibility at the matrix-filler interfaces. The tensile strength and thermal conductivity are increased by 30% and 50%, respectively. Additionally, the band structure variation is observed in the fluorinated BNNs, where the electron trap states are formed at the interface. With the deepened deep trap depth and increased density, the breakdown strength is enhanced by 50%. The breakdown phase field simulations also indicate the high discharge energy consumption by the fluorination effect.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 39
·22347-22352
·
IF 12.732
Shunqiang Chen,Qingshun Nian,Lei Zheng,Bing-Qing Xiong,Zihong Wang,Yanbin Shen,Xiaodi Ren
High concentration electrolyte (HCE) provides a great opportunity for the development of long-life aqueous zinc (Zn) metal batteries because it can eliminate Zn dendrites and promotes higher Zn coulombic efficiencies (CEs) than conventional aqueous electrolytes. However, its application is limited by high cost, high viscosity, poor wettability and ionic conductivity. In this work, a localized high concentration electrolyte (LHCE) with 1,4-dioxane as the diluent and the hydrogen-bond modulator is reported for aqueous Zn metal batteries to overcome these limitations. More importantly, compared to the HCE, the unique solvation structure in the LHCE greatly boosts the anion chemistries to induce fluorinated interphases on the Zn anode and the V2O5 cathode. As a result, the LHCE not only achieves higher rate capabilities for Zn metal anodes and Zn‖V2O5 batteries, but also enables the Zn CE to quickly reach an average of 99.7% without the formation of dendrites (compared to <99% for the corresponding HCE). This approach can also be used in other aqueous battery systems to adjust the electrolyte physical properties and control the interphase formation process for practical applications.
研究领域:
电化学
·
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 32
·2101737
·
IF 18.808
Yitao He,Yaohui Zhang,Zhihong Wang,Xifei Li,Zhe Lü,Xiqiang Huang,Zhiguo Liu
Surface protection has drawn increasing attention in lithium (Li) metal batteries by simultaneously taking advantage of the uniform potential distribution and high conductivity, whereas tuning the composition of the protective film and improving the resistance at the interface of protective film/Li metal remain the challenges. Herein, a solid-state anodic oxidation strategy for preparing an in situ protective film for enhanced cycle life of Li metal anode is illustrated. The solid-state anodic oxidation of lithium metal is realized for the first time, and the method can be further modified for tuning the composition of the protective film for highly ionic conductive fluorine-rich interface. Surface electrodeposition simulations indicate the important role of the conductive protective film in increasing the uniform potential distribution on the Li surface. The as-prepared in situ fluorinated protective film efficiently suppresses the dendrite growth and promotes the cycling performance of the Li metal full cell in commercial ester electrolyte without any additive. This work opens up a new avenue for fabricating unique in situ protective films with controlled composition on Li surface for energy storage applications.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
界面化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Jingru Li,Han Su,Min Li,Jiayuan Xiang,Xianzhang Wu,Sufu Liu,Xiuli Wang,Xinhui Xia,Changdong Gu,Jiangping Tu
Lithium-metal batteries are promising candidates for the next-generation energy storage devices. However, notorious dendrite growth and an unstable interface between Li and electrolytes severely hamper the practical implantation of Li-metal anodes. Here, a robust solid electrolyte interphase (SEI) layer with flexible organic components on the top and plentiful LiF together with lithiophilic Zn nanoparticles on the bottom is constructed on Li metal based on the spray quenching method. The fluorinated interface layer exhibits remarkable stability to shield Li from the aggressive electrolyte and restrain dendrite growth. Accordingly, the modified Li electrode delivers a stable cycling for over 400 cycles at 3 mA cm–2 in symmetric cells. An improved capacity retention is also achieved in a full cell with a LiFePO4 cathode. This novel design of the artificial SEI layer offers rational guidance for the further development of high-energy-density lithium-metal batteries.
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）