To achieve high energy density lithium-ion battery depends on high area load of the active material in the cathode. However, it is challenging to attain high loading of active material by traditional wet coating method due to large amount of organic solvent used. A solvent-free manufacturing cathode that take advantages of viscous flow polymer binder under shearing force of ball-milling to bind the active materials and the conductive carbon uniformly on the current collector is an environment-friendly alternative and has attracted increasing attention. Herein, a solvent free manufacturing LiFeO 4 cathode with thermoplastic polymer poly(lactide-co-propylene carbonate) as functional binder has high area loading up to 57 mg/cm 2 of active material, and the battery assembled with such a LiFeO 4 cathode and lithium metal anode can release a specific capacity of 135.5 mAh/g at 0.2C. In addition, the cathode using poly(propylene carbonate) or polycaprolactone functional binder can also be loaded with 40 mg/cm 2 of active material, which expands the variety of binders for solvent free manufacturing electrodes. Solvent free manufacturing electrodes with such functional binders are expected to break through the technical bottleneck of lithium-ion battery with high energy density.
Lei Hu,Yulang Ren,Ciwei Wang,Jiedong Li,Zehai Wang,Fu Sun,Jiangwei Ju,Jun Ma,Pengxian Han,Shanmu Dong,Guanglei Cui
For preparing next-generation sulfide all-solid-state batteries (ASSBs), the solvent-free manufacturing process have huge potential for the advantages of economic, thick electrode, and avoidance of organic solvents. However, the dominating solvent-free process is based on the fibrillation of polytetrafluoroethylene, suffering from poor mechanical property and electrochemical instability. Herein, a continuously solvent-free paradigm of fusion bonding technique is developed. A percolation network of thermoplastic polyamide (TPA) binder with low viscosity in viscous state is constructed with Li 6 PS 5 Cl (LPSC) by thermocompression (≤5 MPa), facilitating the formation of ultrathin LPSC film (≤25 μm). This composite sulfide film (CSF) exhibits excellent mechanical properties, ionic conductivity (2.1 mS/cm), and unique stress-dissipation to promote interface stabilization. Thick LiNi 0.83 Co 0.11 Mn 0.06 O 2 cathode can be prepared by this solvent-free method and tighly adhered to CSF by interfacial fusion of TPA for integrated battery. This integrated ASSB shows high-energy-density feasibility (>2.5 mAh·cm −2 after 1400 cycles of 9200 hours and run for more than 10 000 hours), and energy density of 390 Wh·kg −1 and 1020 Wh·L −1 . More specially, high-voltage bipolar cell (≥8.5 V) and bulk-type pouch cell (326 Wh·kg −1 ) are facilely assembled with good cycling performance. This work inspires commercialization of ASSBs by a solvent-free method and provides beneficial guiding for stable batteries. This article is protected by copyright. All rights reserved
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