A current collect-free Li _1.2 Ni _0.13 Co _0.13 Mn _0.54 O ₂ flexible film for high-performance lithium-ion batteries

Abstract Due to the high demand for more convenient flexible devices, there are more requirements for higher performance of flexible batteries. The layered lithium-rich manganese-based Li _1.2 Ni _0.13 Co _0.13 Mn _0.54 O ₂ cathode material has the advantages of higher energy density, higher discharge capacity and environmentally friendly, so it can be used for high-performance flexible electrode cathode material. Its theoretical capacity can reach more than 250 mAh g ⁻¹ , which is higher than most cathode materials currently used in commercialization. Here we synthesize Li _1.2 Ni _0.13 Co _0.13 Mn _0.54 O ₂ (LNCM) cathode, and then use a simple method to make a current collect-free LNCM flexible film. This film has excellent flexibility and electrochemical performance. At 25 mA g ⁻¹ , its initial discharge capacity reaches 314.0 mAh g ⁻¹ . After 200 cycles of 500 mA g ⁻¹ , its capacity retention rate is 82.1%, the attenuation is about 0.08% per cycle. Moreover, by bending at any position of the flexible film, it can still remain intact, and the soft-packaged battery made by the flexible film can still be used under the bending condition and keep the brightness of the LED lamp unchanged. This shows that using Li _1.2 Ni _0.13 Co _0.13 Mn _0.54 O ₂ to make high-performance flexible electrodes is a simple and effective method, which is expected to be practically applied to flexible electronic devices.