Research on the performance of high energy density lithium-ion batteries based on dry-processed electrodes

Abstract

A LiNi_0.8Co_0.1Mn_0.1O₂/graphite electrode system with an energy density of up to 327.7 Wh/kg is rationally designed. The cathode is prepared by a dry process, while the anode with a uniform carbon nanotube dispersion structure is prepared by a semi-dry process. The study first analyzes the effect of electrode load on the performance, and then investigates the influence of the type and content of conductive agent on the reduction decomposition reaction in the dry anode. The electrochemical tests show that the dry-processed full cells show a significant improvement in energy density, rate performance and cycling stability，and the capacity retention rate of the dry-processed full cells is as high as 90 % after 400 cycles. Scanning electron microscopy is used to reveal the unique structure of the dry-processed electrodes, and tensile, folding and electrochemical tests are performed on the dry-processed electrodes at different loads to select the optimum electrode loads. In addition, a systematic electrochemical evaluation of the dry-processed anode containing different conductive agents is carried out to reveal the effect of the conductive agents. Finally, the electrode interface conditions after full cell cycling are analyzed by X-ray photoelectron spectroscopy to elucidate the differences between dry-processed electrodes and slurry-based process electrodes.