Flexible Organic–Inorganic Composite Solid Electrolyte with Asymmetric Structure for Room Temperature Solid-State Li-Ion Batteries

Solid state electrolytes have stimulated research interest due to their promising application in lithium batteries with high safety. In this paper, an asymmetrical structure composite solid electrolyte consisting of Li1.3Al0.3Ti1.7(PO4)3 (LATP), poly­(vinylidene fluoride–hexafluoropropylene) (P­(VDF-HFP)), succinonitrile (SN), and a polyimide (PI) film (named ACSE-PI) was fabricated successfully. This solid electrolyte is flexible and can be stable at a high temperature of 150 °C. Moreover, it exhibits a wide electrochemical window of 5 V and high ionic conductivity of over 10–4 S cm–1. An all-solid-state battery assembled with this electrolyte exhibits excellent performance at ambient temperature. In particular, the specific discharge capacity of LiFePO4/ACSE-PI/Li battery is 168.4, 164.4, 154.9, 143.4, 129.5, and 109.4 mAh g–1 at a rate of 0.1, 0.2, 0.5, 1, 2, and 5 C, respectively. It also delivers a reversible discharge capacity of 156 mAh g–1 after 200 cycles at 0.2 C. Notably, the battery can also operate at 4 °C, and the discharge capacity is higher than 110 mAh g–1 after 200 cycles at 0.2 C. Considering the good performances mentioned above, the ACSE-PI electrolyte is appropriate for the practical application of a solid-state Li-ion battery with higher safety

Flexible Organic–Inorganic Composite Solid Electrolyte with Asymmetric Structure for Room Temperature Solid-State Li-Ion Batteries

Solid state electrolytes have stimulated research interest due to their promising application in lithium batteries with high safety. In this paper, an asymmetrical structure composite solid electrolyte consisting of Li1.3Al0.3Ti1.7(PO4)3 (LATP), poly­(vinylidene fluoride–hexafluoropropylene) (P­(VDF-HFP)), succinonitrile (SN), and a polyimide (PI) film (named ACSE-PI) was fabricated successfully. This solid electrolyte is flexible and can be stable at a high temperature of 150 °C. Moreover, it exhibits a wide electrochemical window of 5 V and high ionic conductivity of over 10–4 S cm–1. An all-solid-state battery assembled with this electrolyte exhibits excellent performance at ambient temperature. In particular, the specific discharge capacity of LiFePO4/ACSE-PI/Li battery is 168.4, 164.4, 154.9, 143.4, 129.5, and 109.4 mAh g–1 at a rate of 0.1, 0.2, 0.5, 1, 2, and 5 C, respectively. It also delivers a reversible discharge capacity of 156 mAh g–1 after 200 cycles at 0.2 C. Notably, the battery can also operate at 4 °C, and the discharge capacity is higher than 110 mAh g–1 after 200 cycles at 0.2 C. Considering the good performances mentioned above, the ACSE-PI electrolyte is appropriate for the practical application of a solid-state Li-ion battery with higher safety

Enhanced Rate Performance of Al-Doped Li-Rich Layered Cathode Material via Nucleation and Post-solvothermal Method

Al-doped layered cathode materials Li_{1.5–<i>x</i>}Al_<i>x</i>Mn_0.675Ni_0.1675Co_0.1675O₂ have been successfully synthesized via a rapid nucleation and post-solvothermal method. The surface morphology and crystal structures of Al-doped Li-rich materials are investigated via scanning electron microscopy, X-ray diffraction, Raman spectra, and X-ray photoelectron spectroscopy. After optimization, the Li_1.45Al_0.05Mn_0.675Ni_0.1675Co_0.1675O₂ (Al = 0.05) sample showed excellent electrochemical performance, and the discharge capacities are 323.7 and 120 mAh g^–1 at a rate of 0.1 and 20 C, respectively. These improvements, based on electrochemical performance evaluation and density functional theory calculations, might be ascribed to the increased electron conductivity of layered Li-rich material via Al³⁺ ions doped into a crystal structure

Flexible Organic–Inorganic Composite Solid Electrolyte with Asymmetric Structure for Room Temperature Solid-State Li-Ion Batteries

Solid state electrolytes have stimulated research interest due to their promising application in lithium batteries with high safety. In this paper, an asymmetrical structure composite solid electrolyte consisting of Li1.3Al0.3Ti1.7(PO4)3 (LATP), poly­(vinylidene fluoride–hexafluoropropylene) (P­(VDF-HFP)), succinonitrile (SN), and a polyimide (PI) film (named ACSE-PI) was fabricated successfully. This solid electrolyte is flexible and can be stable at a high temperature of 150 °C. Moreover, it exhibits a wide electrochemical window of 5 V and high ionic conductivity of over 10–4 S cm–1. An all-solid-state battery assembled with this electrolyte exhibits excellent performance at ambient temperature. In particular, the specific discharge capacity of LiFePO4/ACSE-PI/Li battery is 168.4, 164.4, 154.9, 143.4, 129.5, and 109.4 mAh g–1 at a rate of 0.1, 0.2, 0.5, 1, 2, and 5 C, respectively. It also delivers a reversible discharge capacity of 156 mAh g–1 after 200 cycles at 0.2 C. Notably, the battery can also operate at 4 °C, and the discharge capacity is higher than 110 mAh g–1 after 200 cycles at 0.2 C. Considering the good performances mentioned above, the ACSE-PI electrolyte is appropriate for the practical application of a solid-state Li-ion battery with higher safety

Solid Polymer Electrolyte Based on Polymerized Ionic Liquid for High Performance All-Solid-State Lithium-Ion Batteries

Polymerized ionic liquids (PILs) have several advantages over ionic liquids, such as easy handling, good electrochemical performance, and chemical compatibility. In this research, a solid-state electrolyte composite membrane was successfully fabricated by using an imidazolium-based polymerized ionic liquid as polymer matrix, a kind of porous fiber cloth as rigid frame, and lithium bis­(trifluoro­methane­sulfonyl)­imide (LiTFSI) as lithium salt. The ionic conductivity of the composite electrolyte with 2.0 mol/kg LiTFSI is 7.78 × 10–5 S cm–1 at 30 °C and reaches 5.92 × 10–4 S cm–1 at 60 °C, which is considered a satisfactory value for potential application in lithium-ion batteries. The specific discharge capacity of the LiFe­PO4/Li cell with as-prepared composite electrolyte is 138.4 mAh g–1, and 90% of the discharge capacity is retained after 250 cycles at 60 °C. In order to further improve the conductivity, Li1.3­Al0.3­Ti1.7­(PO4)3 (LATP) ceramic electrolyte particles are dispersed in a PIL polymer matrix to prepare the PIL-LiTFSI-LATP composite electrolyte. LiFe­PO4/Li cells using PIL-LiTFSI-LATP (10 wt % LATP) as a solid-state electrolyte exhibit excellent rate performance and high capacity retention (close to 97% after 250 cycles at 60 °C). This work may provide a unique way to prepare a new series of electrolytes for high-performance solid-state lithium batteries

Good Low-Temperature Properties of Nitrogen-Enriched Porous Carbon as Sulfur Hosts for High-Performance Li–S Batteries

Despite the increased attention devoted to exploring cathode construction based on various nitrogen-enriched carbon scaffolds at room temperature, the low-temperature behaviors of Li–S cathodes have yet to be studied. Herein, we demonstrate the good low-temperature electrochemical performances of nitrogen-enriched carbon/sulfur composite cathodes. Electrochemical evaluation indicates that a reversible capacity of 368 mAh g^–1 (0.5 C) over 100 cycles is achieved at −20 °C. After returning to 25 °C, a capacity of 620 mAh g^–1 (0.5 C) is achieved over 350 cycles with a low-capacity attenuation rate (0.071% per cycle) and an initial capacity of 1151 mAh g^–1 (0.1C). This positive electrochemical property was speculated to result from the good surface chemistry of the various amine groups in the nitrogen-enriched carbon materials with enhanced polysulfide immobilization