CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Jiajia Li,Lipeng Yang,Haitao Zhang,Xiaoyan Ji
The Li dendrites introduced by the inhomogeneous Li-ion flux are the barriers to the commercialization of solid-state lithium metal batteries (LMBs). Increasing the Li + transference number and homogenizing the Li + flux are two effective strategies to solve the aforementioned issues. Herein, a flexible composite solid electrolyte (CSE) with an enhanced Li + transference number, high ionic conductivity, and self-healing function was synthesized via a simple template method. Boron nitride (BN) nanosheets with high specific surface area and richly porous structure were used as the passive inorganic filler, homogenizing the Li + flux and facilitating the Li + transmission. The flexible and self-healing features of the CSE reduced the interface resistance and considerably prolonged their cycling life. By exploiting stress–strain curves before and after healing, along with physical characterizations, the self-healing efficiency was obtained and the dendrite suppress mechanisms at the electrode/CSE interface were discussed. Finally, the assembled LiFePO 4 /Li cell with optimized CSE exhibited impressive cycling performance and delivered a steady discharge capacity up to 152 mA h g −1 after 300 cycles at 0.1C. This universal strategy can be used in other emerging energy storage fields to boost high energy density and long cycling life.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Jianfeng Wang,Jun Li
The traditional PP separator is failed to inhibit the polysulfide shuttle effect for the lithium-sulfur ctteries. Besides, it has poor safety porblem when used at high temperatures. Therefore, it is urgent to develop new modified separator to repalce the traditional separator. To deal with these problems, layered hierarchical C@MoS 2 spheres are prepared and modified the traditional separator. Due to the presence of the C@MoS 2 modified separator, the Li-S batteries with C@MoS 2 separator display high specific capacity and superior cycling stability even at high rate of 2C. The high electrochemical performance is attributed to efficient inhibition of shuttle effect by the adsorption and catalytic conversion of polysulfide on the C@MoS 2 separator. This work has a certain reference value for the future large-scale application of lithium-sulfur battery.
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高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Bin Liang,Fangyuan Cheng,Xiaoyu Ge,Xuejun Tan,Chun Fang,Jiantao Han
The Ni-rich LiNixMnyCozO2 (x + y + z = 1, x > 0.5, Ni-rich NMC) materials are one of the most potential cathodes for high energy density lithium-ion batteries (LIBs) due to their high specific capacity and relatively low cost. However, performances of LIBs with the Ni-rich NCM cathode below 0 °C are restricted by low ion conductivity of the electrolyte and a slow ion diffusion rate at the electrode–electrolyte interphase. Here, γ-butyrolactone (GBL) with a low melting point and high ion conductivity is used to partially replace ethylene carbonate, which is conducive to lower the freezing point and increase the low-temperature ionic conductivity of the electrolyte, and the addition of GBL improves the dissolution of lithium difluoro(oxalato)borate (LiDFOB) in a traditional carbonate solvent. Instead of lithium hexafluorophosphate (LiPF6), LiDFOB can form a F-, B-, and O-rich interfacial phase at the Ni-rich NCM cathode, suppressing the fatal interface reaction and reducing the interface impedance. As a result, the electrolyte using GBL as the cosolvent and LiDFOB as the lithium salt can significantly improve the specific discharge capacity and cycling stability of LiNi0.8Co0.1Mn0.1O2/Li cells at 0 °C and −30 °C. At 0 °C, the LiNi0.8Co0.1Mn0.1O2/Li cells have a discharge specific capacity of 160 mA h g–1 and a capacity retention rate of 99% over 100 cycles. They deliver a decent capacity at −30 °C. This rational design of an electrolyte via optimizing the combination of a solvent and a lithium salt has been confirmed to be a low cost but rather an effective method to improve the low-temperature performances of LIBs.
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Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 15
·3658-3668
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IF 6.813
Xirui Kong,Yichen Kong,Xiaobin Liao,Sheng Liu,Yan Zhao
Lithium–sulfur batteries (LSB) are regarded as one of the next-generation energy storage systems with a high energy density. However, the shuttle effect of lithium polysulfides (LiPSs) and irreversible consumption of the Li anode prevent the practical application of Li–S batteries. In this work, a mixed tetrahydrofuran (THF) and dipropyl ether (DPE) based electrolyte has been optimized for Li–S batteries. Due to the common-ion effect, the LiPS solubility has been significantly inhibited when the sulfur cathode is operating in a concentrated electrolyte containing an optimized solvent system with weak dissolving power. And no self-discharge effect occurred in the cells with these electrolytes during a 10 day storage. Besides, the coulombic efficiency (CE) for Li deposition/stripping has been improved by optimizing the ratio of dual lithium salts. Impressively, Li‖Cu half-cells can run stably for more than 500 cycles with a high CE (>99.3%). For these reasons, a Li–SeSPAN cell with a L1L2TE-1382 electrolyte demonstrates an excellent capacity retention (>94% after 500 cycles) with an ultrathin (50 μm) Li metal anode. With a good compatibility of the optimized electrolyte for both the Li metal anode and sulfur cathode, this work provides a new design strategy for the electrolyte for lithium–sulfur batteries.
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JOURNAL OF POWER SOURCES
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2022
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IF 9.794
Weifeng Zhang,Guoxing Jiang,Wenwu Zou,Longhai Zhang,Shulian Li,Shengguang Qi,Xiujun Wang,Zhiming Cui,Huiyu Song,Li Du,Zhenxing Liang
The parasitic side reaction between the electrolyte and the lithium metal (Li 0 ) forms an unstable heterogeneous interphase, causing the poor reversibility of Li plating/stripping. The rational design of protection layer on Li 0 anode is imperative to inhibit side reactions and achieve fast Li + transport on the Li 0 /electrolyte interface. Herein, by firstly coordinating the bis(fluorosulfonyl)imide anion (FSI − ) to the protection layer, a layer consisting of 2D ionic vinylene-linked covalent organic frameworks (ivCOF-FSI) is proposed to stabilize the Li 0 /electrolyte interface. As demonstrated theoretically and experimentally, the triazine group in the cationic framework is identified to promote Li + de-solvation process while partial FSI − prefers to form LiF-rich interphase. Attributed to these superiorities, the ivCOF-FSI layer endows the Li 0 /electrolyte interface with high reversibility in carbonate-based electrolytes by simultaneously suppressing the side effect and achieving rapid Li + transfer. Combined with the high stability of solid-liquid interface, the LiFePO 4 full cells with ivCOF-FSI/Li anode display enhanced cyclability under a high cathode loading of 9.4 mg cm −2 and a low negative/positive capacity ratio of 5. This work provides a novel route for stabilizing the interfacial chemistry of solid-liquid interface, aiming to pave the way for the next-generation high-energy-density batteries .
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Nan Wang,Jialin Fu,Xuecheng Cao,Lingling Tang,Xiankai Meng,Zhenyi Han,Linhao Sun,Shuo Qi,Dangsheng Xiong
Li–air batteries have received significant attention for their ultrahigh theoretical energy density. However, the byproducts induced by attacking air hinder the conversion of Li–O 2 batteries to Li–air batteries. Humidity is one of the main obstacles, not only causing side reactions with the discharge products but also leading to rapid corrosion of the lithium anode. Here, we fabricated a novel composite hydrophobic catalyst by loading RuO 2 and graphene on N-doped porous carbon. The catalyst was endowed with hydrophobicity and showed superior catalytic performance and low affinity to water in the air. A Li–air battery equipped with this novel composite catalyst exhibited eminent cycling performance in pure oxygen (over 470 h), humid oxygen [∼40% relative humidity (RH), over 310 h], and ambient air (∼42% RH, over 330 h) at a current density of 500 mA g −1 , and the discharge specific capacity increased from 13122.1 to 19358.6 mAh g −1 .
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 20
·16383-16395
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IF 2.779
Zhao Taolin,Chang Liyao,Ji Rixin,Chen Shaokang,Jin Xiaoyu,Zheng Yingdi,Huang Xiyun,Shen Jiangang,Zhang Yuxia
Recently, all types of electrical equipment put forward increasing requirements on the energy density of secondary rechargeable batteries. The low specific capacity of cathode material is the primary factor that restricts the energy density of Li-ion batteries. Li-rich Mn-based cathode materials have the advantages of high specific capacity, high operating voltage, low cost, and environmental friendliness. However, they have the limitations of low first Coulombic efficiency and serious capacity/voltage attenuation. In this work, lithium polyacrylate (LiPAA) has been employed as a water-soluble binder in the electrode to develop a high-performance Li-rich Mn-based cathode. The effect of the LiPAA binder on voltage drop and electrochemical performance of Li[Li 0.2 Co 0.13 Ni 0.13 Mn 0.54 ]O 2 cathode has been examined to reveal the modification mechanism. The results show that carboxyl group (–COOH) in the LiPAA structure can form strong hydrogen bonds with the oxygen atoms in the active material, making the electrode components firmly bonded and thus maintaining the structural stability of the cathode upon cycling. Moreover, the LiPAA binder can effectively inhibit voltage drop of Li[Li 0.2 Co 0.13 Ni 0.13 Mn 0.54 ]O 2 . The discharge voltage of the electrode decreases by only 117 mV after 50 cycles. Green water-soluble LiPAA has broad prospective applications as a binder of electrode materials of secondary batteries.
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IONICS
·
2021
·Vol. 28
·期 1
·85-97
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IF 2.817
Wang Xin,Hua Haiming,Li Jiyang,Shen Xiu,Xie Xiaohua,Zhang Peng,Zhao Jinbao
Polyethylene oxide (PEO) was one of the most classic and widely used solid polymer electrolyte matrixes. In this work, we added the previously synthesized titanium dioxide (B-P25) fillers with oxygen vacancies to the PEO-LiClO 4 solid electrolyte system. It is found that compared with the pristine P25 fillers, the oxygen vacancies lead to the decrease of ionic conductivity and the Li + transference number. Infrared and Raman spectroscopy shows that the introduction of oxygen vacancies lead to the formation of Li + -ClO 4 − ion pairs and the decrease of carrier concentration resulted in the decrease of Li + conductivity. Further theoretical calculations verified that this is due to the preferential combination of oxygen vacancies and ether oxygen atoms of PEO. This finding effectively supplements the effect of oxide oxygen vacancies on the conduction of Li + in the PEO matrix, and not all oxygen vacancies are beneficial to the conduction of Li + ions in the PEO matrix.
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Small Methods
·
2021
·Vol. 5
·期 11
·2100765
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IF 14.188
Ruizhe Li,Wujie Dong,Jun Pan,Fuqiang Huang
The transition metal oxides (TMOs) with high volumetric capacities are promising anodes for the future electronics, however, they usually suffer from severe capacity decay and poor rate capability. Carbon hybridization and nanosizing can resolve these challenges, yet these significantly compromise the volumetric capacity. Herein, both high capacity and long cycling stability are simultaneously achieved in the micrometer-sized Mo-based oxide particles by designing the dual conductive MoO 2 /β-MoO 3- x mosaics. The rational combination of the highly electronically conductive MoO 2 with the highly ionically conductive and open-structured β-MoO 3 achieves a promising volumetric capacity of 1742 mAh cm −3 , which is four times higher than the commercial graphite. Simultaneously, both stable cycling performance (87% retention after 500 cycles) and excellent rate capability (outperformed a majority of the MoO 2 -based anodes reported in literature) are obtained in the lithium-ion batteries. For the sodium-ion batteries, the composite exhibits three times higher Na + storage than pure MoO 2 . Moreover, the decisive role of the bond energy on the electrochemical performance of TMOs is also identified. This study may open up new perspectives for choosing and designing the TMO anodes with a high volumetric capacity for the practical applications.
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Processes
·
2021
·Vol. 10
·期 1
·49
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IF 2.847
Yu Zheng,Xin Wu,Xuexia Lan,Renzong Hu
Recently, high entropy oxides (HEO) with special stabilization effects have been widely investigated as new anode materials for lithium-ion batteries. However, the lithium storage mechanism of HEO is still under debate. In this work, we applied a modified solution combustion synthesis method with a subsequent ball milling refinement process to prepare a six-component (FeNiCrMnMgAl)3O4spinel high entropy oxide (6-SHEO). The novel 6-SHEO anode features outstanding electrochemical performance, enabling a stable capacity of 657 mAh g−1at a current rate of 0.2 A g−1after 200 cycles, and good high-rate capability with 350 mAh g−1even at 4 A g−1. In addition, the lithium storage behavior of this 6-SHEO anode was explored in detail through in-situ XRD and ex-situ TEM approaches. Surprisingly, a reversible spinel to rock salt phase transition behavior and spinel phase residue phenomenon was firstly observed by this route. Furthermore, for better understanding of the phase change behavior in this 6-SHEO anode, a high-energy ball milling approach was applied to induce a similar spinel to rock salt phase transformation for the first time, which generates fresh insight into the mechanism of the phase change behavior in this 6-SHEO anode.Keywords:lithium-ion battery;spinel-type high entropy oxide;phase transformation;in-situ X-ray diffraction
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yue Ma,Qifang Sun,Su Wang,Ying Zhou,Dawei Song,Hongzhou Zhang,Xixi Shi,Lianqi Zhang
Favorable interface is essential for the implementation of high energy density and high safety solid-state lithium metal battery (SSLMB). The in-situ transformation of electrolyte from liquid to solid-state is of great significance for the compatibility of interface. Herein, an in-situ polymerized glycerin triglycidyl ether (PGTE) solid polymer electrolyte (SPE) featuring excellent ion transfer capability, superior interfacial compatibility and cross-linked structure is developed by the initiation of optimal LiDFOB following cationic catalytic mechanism. Ionic conductivity of 4.16 × 10 -4 S cm −1 is achieved at 60 °C due to the superiority of oxyethylene repeating units (C–C-O/C-O-C), and a discharge capacity of 135.2 mAhg −1 is obtained after 200 cycles at 0.2C for LiFePO 4 (LFP)/PGTE/Li battery. More importantly, as a Li salt initiated SPE, the in-situ polymerization process of PGTE is firstly investigated via ex-situ FT-IR, the ring opening catalytic activity of Lewis acid on epoxide is evaluated and the order of LiDFOB＞LiPF 6 ＞AlCl 3 is revealed. Furthermore, the effect of in-situ prepared SPE on electrode/electrolyte interface is innovatively explored using in-situ electrochemical impedance spectroscopy (EIS). The stable interfacial passivation layer is generated at platform voltage and the maximum value of average diffusion coefficient is also obtained at the plateau.
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Membranes
·
2021
·Vol. 11
·期 4
·267
·
IF 4.106
Danxia Chen,Xiang Wang,Jianyu Liang,Ze Zhang,Weiping Chen
Commercial separators (polyolefin separators) for lithium-ion batteries still have defects such as low thermostability and inferior interface compatibility, which result in serious potential safety distress and poor electrochemical performance. Zeolite/Polyacrylonitrile (Z/PAN) composite separators have been fabricated by electrospinning a polyacrylonitrile (PAN) membrane and then dip-coating it with zeolite (ZSM-5). Different from commercial separators, the Z/PAN composite separators exhibit high electrolyte uptake, excellent ionic conductivity, and prominent thermal stability. Specifically, the Z/PAN-1.5 separator exhibits the best performance, with a high electrolyte uptake of 308.1% and an excellent ionic conductivity of 2.158 mS·cm−1. The Z/PAN-1.5 separator may mechanically shrink less than 10% when held at 180 °C for 30 min, proving good thermal stability. Compared with the pristine PAN separator, the Li/separator/LiFePO4cells with the Z/PAN-1.5 composite separator have excellent high-rate discharge capacity (102.2 mAh·g−1at 7 C) and favorable cycling performance (144.9 mAh·g−1at 0.5 C after 100 cycles). Obviously, the Z/PAN-1.5 separator holds great promise in furthering the safety and performance of lithium-ion batteries.Keywords:separator;electrospinning;polyacrylonitrile;zeolite;lithium-ion batteries
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高影响因子
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