Abstract
All-solid-state lithium batteries (ASSLBs) with solid-state electrolytes (SSEs) are considered as a promising next-generation energy storage technology due to their improved safety and higher energy density. Among various SSEs, halide Li3InCl6 is emerging as a promising candidate because of its high ionic conductivity, air-stability, and wide electrochemical window. Generally, most of the ASSLBs based on inorganic SSEs are assembled by mixed dry pressing, which is not easy, to achieve uniform dispersion of powder composite cathode. Here, a slurry coating method by dispersing active materials (LiNi0.8Co0.1Mn0.1O2), SSEs (Li3InCl6), binders (ethyl cellulose, polymethyl methacrylate, styrene butadiene rubber, and nitrile rubber), and conductive carbon black in toluene solvent is used to fabricate cathodes. We studied the effects of different kinds of binders and their contents on the electrochemical performance of ASSLBs. The results show that polymethyl methacrylate, ethyl cellulose, styrene butadiene rubber, and nitrile rubber binders are all suitable for preparing cathodes, and a binder content of 2 wt% can achieve the best electrochemical performance of the ASSLBs. This work proves that the intimate contact between the active material and the halide SSE in the electrode can be realized by using slurry coating method with suitable binders, thus achieving stable electrochemical performance.
Highlights
Compared with traditional liquid lithium-ion batteries, all solid-state lithium batteries (ASSLBs) have better development prospects due to their improved safety, high-energy density, and thermal stability (Yue et al, 2017; Kraft et al, 2018; Zhang et al, 2018b)
The All-solid-state lithium batteries (ASSLBs) are assembled with a positive electrode prepared by a slurry coating method
The results show that the electrodes prepared by slurry coating method have low interfacial impedance due to the intimate contact between NCM particles and the solid-state electrolytes (SSEs)
Summary
Compared with traditional liquid lithium-ion batteries, all solid-state lithium batteries (ASSLBs) have better development prospects due to their improved safety, high-energy density, and thermal stability (Yue et al, 2017; Kraft et al, 2018; Zhang et al, 2018b). The positive electrode prepared by mixed dry pressing has poor contact between electrode material and SSEs, which will produce large charge transfer resistance and affect the electrochemical performance of the battery (Zhou et al, 2016). The cathodes prepared by the slurry coating method can be closely contacted with the active materials under the action of binder, and dispersed evenly with each other, which can effectively reduce the interfacial resistance (Banerjee et al, 2016). This is because the rich functional groups of polymer binder can make the components in the cathodes wellcombined through chemical bond adsorption (Park et al, 2016). The galvanostatic charge–discharge studies of NCM cathodes were conducted at different current densities (e.g., 1C 200 mA g−1), within a potential window of 2.5–4.2 V vs. Li/Li+ at 25°C
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