ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Jingru Li,Sufu Liu,Yongliang Cui,Shengzhao Zhang,Xianzhang Wu,Jiayuan Xiang,Min Li,Xiuli Wang,Xinhui Xia,Changdong Gu,Jiangping Tu
Uncontrollable dendrite growth and low Coulombic efficiency are the two main obstacles that hinder the application of rechargeable Li metal batteries. Here, an optimized amount of potassium hexafluorophosphate (KPF6, 0.01 M) has been added into the 2 M LiTFSI/ether-based electrolyte to improve the cycling stability of lithium–sulfur (Li–S) batteries. Due to the synergistic effect of self-healing electrostatic shield effect from K+ cations and the LiF-rich solid electrolyte interphases derived from PF6– anions, the KPF6 additive enables a high Li Coulombic efficiency of 98.8% (1 mA cm–2 of 1 mAh cm–2). The symmetrical Li cell can achieve a stable cycling performance for over 200 cycles under a high Li utilization up to 33.3%. Meanwhile, the polysulfide shuttle has been restrained due to the higher concentration of the LiTFSI in the electrolyte. As a result, the assembled Li–S full cell displays excellent capacity retention with only 0.25% decay per cycle in the final electrolyte. Our work offers a smart approach to improve both the anode and cathode performance by the electrolyte modification of rechargeable Li–S batteries.
研究领域:
电化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 16
·9469-9477
·
IF 10.7
Shilun Gao,Mengxiang Ma,Youjia Zhang,Lin Li,Shuangshuang Zhu,Yayue He,Dandan Yang,Huabin Yang,Peng-Fei Cao
Solid polymer electrolytes (SPEs) with low density, high flexibility and excellent processability have been attracting broad interest in constructing high energy density and safe all-solid-state batteries. However, the poor lithium-ion (Li+) migration kinetics should be addressed before their large-scale applications. Reducing the thickness can efficiently shorten the Li+ diffusion distance and time, making the low ionic conductivity of electrolytes still applicable for practical applications. Herein, by integrating polyethylene fiber (PEF) with an in situ polymerized network, i.e., poly[(poly(ethylene glycol) methyl ether methacrylate)-r-(vinyl ethylene carbonate)-r-(dimethyl aminopropyl methacrylamide)-r-(polyethylene glycol dimethacrylate)] (PPVD), an ultra-thin, flexible and mechanically robust SPE with a thickness of ≈5 μm was developed. With an ionic conductivity of 2.0 × 10−2 mS cm−1, such an in situ constructed ultra-thin SPE still exhibits a high ionic conductance of 0.1 S, providing sufficient Li+ conductance for operable batteries at room temperature. As a result, the assembled Li|PPVD@PEF|Li symmetric cell delivers stable cycling performance over 800 h. The Li|PPVD@PEF|LiFePO4 full cell exhibits excellent cycling stability with a capacity retention of 85.7% over 500 cycles. The current design of the in situ constructed ultra-thin SPE not only decreases the electrolyte/electrode interfacial resistance but also sheds light on breaking the bottleneck of ionic conductivity for SPEs towards high energy density batteries.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 31
·20288-20299
·
IF 10.7
Liang Chai,Zhiheng Zou,Zhengsheng Yang,Guang Yang
Developing flexible polymer electrolytes that can concurrently promote ion conduction, uniform Li deposition, and robust solid electrolyte interphase (SEI) formation is promising for the development of next-generation lithium metal batteries (LMBs). Herein, a new polymeric zwitterionic electrolyte with a glass fiber support was investigated. A sulfobetaine zwitterionic crosslinker participated in in situ UV-triggered photopolymerization with a carbonate monomer and ether type dimethacrylate. The zwitterionic gel electrolyte (ZGE) demonstrated a high ionic conductivity exceeding 1 × 10−3 S cm−1 and electrochemical oxidative stability (>5 V vs. Li+/Li). The zwitterionic crosslinker in the ZGE was able to mediate homogeneous Li+ flux toward the lithium anode and suppress lithium dendrites (the Li/ZGE/Li cell can cycle stably for more than 1400 h with a current density of 0.1 mA cm−2). The ZGE also helped construct a LiF-rich SEI favorable for dendrite suppression. A Li/ZGE/LiFePO4 (LFP) cell demonstrated excellent long-term cycling stability (>600 cycles with a capacity retention of 92%, high discharge capacity of 155 mA h g−1, and coulombic efficiency of >99.5%). The ZGE could also support a Li/Ni0.815Co0.15Al0.035O2 (NCA) cell to operate with a high specific capacity of 232 mA h g−1. The flexible ZGE made it possible for a pouch-type Li/LFP cell to cycle and function well in a flat and bending state. This polymer electrolyte holds great promise for the exploration of high-energy polymeric LMBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiahui Zhou,Man Xie,Feng Wu,Guangling Wei,Yang Mei,Ruling Huang,Guoqiang Tan,Li Li,Renjie Chen
Great efforts have been made to optimize Li metal anodes to improve energy density and cycle life. However, challenges remain in achieving uniform Li plating/stripping while maintaining stable interphase chemistry. Here, an engineered graphene aerogel with uniformly oriented microscale channels, and normalized lithiophilic binding sites as hosted Li anodes is reported. Vertically aligned graphene with oriented channels are constructed using a freeze-drying mechanism, and highly lithiophilic binding sites are optimized by adjusting functional oxygen anions on graphene. Based on the in-situ optical microscopy visualization and first-principles calculations, this graphene host design presents homogeneous Li-ion nucleation owing to its straight transport channels with ultrahigh lithiophilicity, resulting in greatly improved cycling stability. Also, the flat and compatible electrode–electrolyte interphase facilitates smooth Li growth, thereby suppressing the formation of dendrites. Notably, the symmetric cells using the new composite anodes exhibit superior electrochemical reversibility over 500 cycles, with the patternable LiFePO 4 //Li@graphene pouch cells displaying outstanding cycling performance. This graphene-hosted Li anode thus demonstrates great potential for Li 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
Journal of Energy Chemistry
·
2024
·
IF 14
Lei Ding,Dandan Li,Sihang Zhang,Zhaoyang Wang,Pengfang Zhang,Fanghui Du,Shuyue Zhao,Daoxin Zhang,Feng Yang,Shuo Zhang
Lithium-sulfur (Li-S) batteries with attractive capacity give remarkable potential for prospective high-capacity application scenarios but suffer a fatal flaw of short cyclability before large-scale commercialization especially owing to polysulfide (Li 2 S n ) transmembrane shuttling. To efficiently restrain chronic Li 2 S n shuttle and expedite Li + transfer, herein, a novel electriferous charge-mosaic S(TMC@Lys-Li) separator preparation approach is recommended. Interfacial polymerizations of lithiated lysine and trimesoyl chloride establish an electriferous charge-mosaic polyamide functional layer. Substituted Li within the charge-mosaic layer offers transition or replacement sites for smoothing Li + migrations, which constructs efficient Li + fast-transfer private channels and accelerates the Li + transfer rate to 9.4 times. Negatively charged polyamide skeleton synchronously heightens Li 2 S n rejections by combining Donnan and steric effects. S(TMC@Lys-Li) replenishes Li for homogenizing Li nucleation and growth, endowing stable plating/stripping behaviors over 250 cycles for Li-Cu batteries. Assembled Li-S cells thus exhibit excellent specific capacity and cyclability at multiple application scenarios such as long periods, high areal capacity, and fast charge, holding 78.1% retention after 500 cycles at 1 C. The superior thermal stability and self-discharge of S(TMC@Lys-Li) dramatically strengthen battery thermal runaway resistance even at 155 ℃, which ensures security for Li-S battery high-power and high-temperature operations. Above alluring features enable charge-mosaic separators to be potentially adopted in practical Li-S batteries demanding strict security, high-capacity density, and fast charge technology.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2015
·Vol. 30
·期 5
·645-653
·
IF 1.647
Ruiqiong Wang,Ronglan Zhang,Bei Xu,Fei Yang,Jianshe Zhao,Shichao Zhang,Junlong Wang
Two novel series of cathode materials LiFe1−x Mx PO4/C (x ≈ 0.0040; M = Mn, Fe, Co, Ni, Cu, and Zn) composites based on metal phthalocyanines (MPc) and metal tetrasulfophthalocyanines (MPcTs) to modify lithium iron phosphate (LiFePO4) for lithium-ion batteries (LIBs) are in situ prepared by solvothermal and calcination techniques. Structures and morphologies of all the composites are characterized by normal methods. To evaluate the electrochemical performance of the composites, the charge/discharge capabilities, rate performance, cycling stabilities, cyclic voltammetry profiles, and electrochemical impedance spectroscopy plots of the LIBs using them as cathode materials are measured carefully. The results indicate that most of the composites deliver highly improved initial discharge capacity and show remarkable reversibility and cycling stabilities. Especially, composites using MPcTs as additives are more efficient for the improvement of specific capacity, rate capability, reversibility, and cycling stability.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2018
·Vol. 5
·期 23
·3708-3716
·
IF 4.446
Nanxiang Feng,Kaixiong Xiang,Li Xiao,Wenhao Chen,Yirong Zhu,Han Chen
Li 1.1 V 0.9 O 2 /C microspheres with isomeric core-shell structure were synthesized by a rapid cooling and subsequent evaporative assembly approach. The prepared Li 1.1 V 0.9 O 2 /C microspheres were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) including elemental mapping analysis, and transmission electron microscopy (TEM). The core-shell Li 1.1 V 0.9 O 2 /C microspheres display identical composition but distinct texture of cores and shells, which herein is described as isomeric structure. Amorphous carbon nanodots are uniformly dispersed in the crystalline Li 1.1 V 0.9 O 2 matrix in the core. In the shell however, Li 1.1 V 0.9 O 2 nanoparticles are embedded in an amorphous carbon network. The Li 1.1 V 0.9 O 2 /C microspheres are tested as active material for anodes in lithium-ion batteries, and exhibit an excellent reversible capacity of 295 mAh g −1 , high capacity retention of 98 % after 100 cycles at 0.2 C and 95 % after 500 cycles at 2 C rate, and deliver wonderful rate capability of 250 mAh g −1 at 5 C. Thus, the Li 1.1 V 0.9 O 2 /C microspheres with isomeric core-shell structure are promising candidates as anode material for commercial lithium-ion batteries. Graphical In a nutshell : Li 1.1 V 0.9 O 2 /C microspheres are synthesized as anode material for lithium-ion batteries. The Li 1.1 V 0.9 O 2 /C microspheres display identical composition but distinct texture of cores and shells, which herein is described as isomeric structure. As anodes in lithium-ion batteries, the microspheres exhibit excellent overall electrochemical performance, rendering this material as promising candidate for the use in commercial lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Donghao Wang,Yuqi Wu,Xuefan Zheng,Shijun Tang,Zhengliang Gong,Yong Yang
All-solid-state Li–S batteries (ASSLSBs) offer an opportunity to realize both high energy density , safety and reliability, via eliminating the polysulfides shuttle effect and flammable liquid electrolyte. However, the sluggish kinetics of S and Li 2 S solid conversion results in low discharge capacity at high active material loading, which is critical for ASSLSBs to implement the high energy density potential. Herein, nitrogen doped-carbon (NC) coated Li 2 S (Li 2 S@NC composite) is developed for ASSLSBs that highly improves electrochemical performance. A thin and uniform nitrogen doped-carbon layer is coated on Li 2 S via pyrolysis deposition approach to prepare Li 2 S@NC. The as obtained Li 2 S@NC composite exhibits greatly enhanced electrochemical performance with high reversible capacity, high coulombic efficiency of ~100%, good rate capability and cycling stability. Particularly, outstanding electrochemical performance with high capacity of 931 mAh g −1 can also be obtained at both high Li 2 S content (43%) and high areal Li 2 S loading (10.4 mg cm −2 ).
研究领域:
材料科学
·
电化学
·
能源存储
·
固态电池
·
纳米材料
✓ 已验证
DOI
高影响因子
HYDROMETALLURGY
·
2019
·
IF 3.465
Jishen Li,Xiyun Yang,Yuyao Fu,Haiqiang Huang,Zhijie Zhong,Yuanyuan Wang
A comprehensive utilization process of Fe, Mn, Ni and Co in the acid leaching liquor of spent lithium ion batteries was put forward. Fe and part of Mn were extracted to synthesize Fe-doped lithium ion-sieve. Ni, Co and the rest of Mn were coprecipitated to prepare ternary lithium ion battery cathode material precursor Ni x Co y Mn 1-x-y (OH) 2 . After removing Cu 2+ ions in acid leaching liquor by adding MnS, two-stage counter current extraction and one-stage stripping were used to extract all Fe 3+ and 40.3% of Mn 2+ ions in sulfuric acid leaching solution to obtain a MnSO 4 stripping solution containing Fe 3+ ions. Iron-doped lithium ion-sieve was synthesized by oxidation of the resulting MnSO 4 solution with KMnO 4 followed by roasting and acid leaching. Fe incorporates into the lattice of lithium ion-sieve and improves the structure stability. Fe-doped lithium ion-sieve shows Li adsorption capacity of 35.29 mg.g −1 and Mn dissolution loss of 1.66%. The Li + adsorption in salt lake brine with the Fe-doped ion-sieve follows a pseudo-second-order kinetic model . Ni x Co y Mn 1-x-y (OH) 2 is regular spherical particles with β-Ni(OH) 2 -like structure. This process provides a simple method for recovery and utilization of Mn, Fe, Ni and Co in spent lithium ion batteries .
研究领域:
材料科学
·
资源回收利用
·
电化学
·
环境工程
·
能源存储
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Xiaorong Meng,Yue Jing,Jiaming Li,Zhengmeng Sun,Zhenpeng Wu
Lithium extraction from salt lakes has become a hot research issue in recent years, and LiMn 2 O 4 -based electrochemical lithium extraction is considered to be one of the most promising technologies for application. However, LiMn 2 O 4 limits its further application due to the dissolution of Mn and the Jahn-Teller effect. In this study, a LiNi 0.05 Mn 1.95 O 4 (LNMO-0.05) lithium-extraction electrode material with truncated octahedral characteristics was prepared. The special crystal surface structure enhanced the diffusion and adsorption rates of Li + , whereas Ni doping effectively suppressed the Jahn-Teller effect, and the two mechanisms synergistically enhanced the lithium extraction performance of LMO. In lithium extraction from East Taijiner brine with an Mg/Li ratio of 46, LNMO-0.05 showed excellent ion selectivity (α Mg-Li = 214.08), high lithium extraction capacity (20.99 mg/g) and no significant capacity decay occurred after 10 cycles. These excellent properties make the LNMO-0.05 electrode suitable for industrial electrochemical lithium extraction.
研究领域:
电化学
·
材料科学
·
环境科学
·
能源技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Samson Ho-Sum Cheng,Kang-Qiang He,Ying Liu,Jun-Wei Zha,Md Kamruzzaman,Robin Lok-Wang Ma,Zhi-Min Dang,Robert K.Y. Li,C.Y. Chung
All-solid-state batteries are proposed to have ultimate safety and higher power and energy densities over conventional lithium ion batteries with liquid electrolytes . The Li ion conductivity and interfacial resistance between electrolyte and electrodes are the major bottleneck of the development of all-solid-state batteries for practical uses. Here, we reported a novel composite electrolyte which is composed of uniform distributed Li ion conducting Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) fillers in PEO/LiClO 4 matrix. The EO:Li + ratio of 15:1 is being used to achieve lower interfacial resistance between electrolyte and electrodes through the melting process. The composite electrolyte is fabricated by simple solution casting method, which is more advantageous comparing with high temperature sintering or sol-gel method used in the fabrication of ceramic electrolytes. The composite electrolyte exhibits good Li ion conductivity of 4.8 × 10 −4 Scm −1 at 60 °C and excellent interfacial stability against Li metal. The all-solid-state lithium battery using this composite electrolyte shows a specific capacity of 140mAhg −1 and an unprecedentedly high capacity retention of 83% after 500 cycles at 60 °C and the rate of 1C. It is concluded that good electrode/electrolyte interfacial stability and contact as well as fast Li ion conductivity obtained by the addition of active garnet particulates to PEO/LiClO 4 matrix are essential criteria for good charge/discharge performance of all-solid-state lithium batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Zhenhua Wang,Xiaodong Wang,Wang Sun,Kening Sun
Lithium sulfur (Li-S) batteries are highly prospective for future generations of transportation and grid storage due to their high energy density and low cost. However, the Li dendrite growth from the anode and the “polysulfide shuttle” from the cathode may cause poor cycling performance and safety concerns, hindering the practicality of Li-S batteries. Herein, we demonstrate a novel separator design by coating three-dimensional (3D) carbon nanofiber (CNF) interlayers on both sides of the separator to achieve a high performance Li-S battery. The CNF interlayer can not only render a uniform Li deposition on the anode by eliminating the “tip effect”, but also restrain the polysulfide diffusion on the cathode with its porous and highly conductive 3D architecture, enhancing the utilization of S-related species significantly. So an average Coulombic efficiency of the Li metal anode protected by a CNF interlayer is up to 95% for 100 cycles at 0.5 mA cm −2 . Moreover, Li-S batteries with CNF interlayers can exhibit remarkable cycle performance, presenting an initial specific capacity of 1207.4 mAh g −1 at 0.5C and retaining at 828.1 mAh g −1 after 100 cycles. In addition, the low-cost raw materials and the simple preparation for CNF interlayers is suitable for industrial scale-up.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）