The Controllable Preparation Of 3D LiCoO₂ Nanoarray And It’s Electrochemical Properties

Compared with the traditional secondary batteries, such as lead-acid battery, Lithium ion battery has obvious advantages in power density, energy density and charge/discharge performance. Moreover, lithium ion battery has advantages, for example, a long cycle life, low self-discharge rate, environmentally friendly. And it has been widely used in small appliances and electric cars. However, there is a lot of defects in the existing battery, for instance, it’s heavy, and it can’t be bended, it’s power/energy density is low, the miniaturization and integration are relatively poor. All of these hindered the development of a new generation of electronic devices. The flexible lithium-ion battery has potential value in energy storage applications, such as wearable and portable electronic devices. The electrode material is the key to a battery’s performance. Through the study, the researchers found that in recent years, changing the two-dimensional structure to three-dimensional structure, greatly improved the performance of lithium ion battery, The concept three-dimensional cell is put forward and gradually attract the researchers’attention. Basic method is design the electrode materials’microstructure, shortening the lithium ion diffusion’s distance, and thus improves the energy density of the battery and charge/discharge capacity. The lithium ion battery with three-dimensional nanostructures has large capacity in per unit area and strong ability of fast charge/discharge. The article is based on the innovative research on three dimensional nano electrodes, the main work are:(1)Prepare the LT/HT-LiCoO2 three-dimensional material on the metal set fluid basal (gold) by hydrothermal treatment and sintering. The material’s content and morphology were characterized By XRD, SEM and TEM analysis. The electrochemical performance of the electrode materials were characterized by the charge/discharge test, cyclic voltammetric and AC impedance test. Prepare the different three-dimensional structure through adjusting the hydrothermal reaction’s temperature and time. Comparing the spinel lithium cobalt oxides and six-party lamellar phase lithium cobalt oxides, the preparation methods of the spinel phase is more simple than the preparation of the six-party lamellar phase save energy, but the latter has obvious good performance in the charge/discharge curve. Therefore, in the following work, our main goal is the preparation of high performance of HT-LiCoO2.(2)Comply with the requirement of flexible device, I prepared the HT-LiCoO2 three-dimensional material on high conductive flexible carbon materials (carbon cloth). Due to the carbon cloth can’t sustain high temperature for a long time, on the basis of the first experiment, we changed the processes appropriately, and found the influence law of the hydrothermal reaction’s time and temperature.(3)Packing the HT-LiCoO2/Li4Ti5O12 flexible full battery, the electrochemical performances were characterized by the charge/discharge test, rate performance test, the flexible lithium ion battery with three-dimensional electrode shows excellent performance.