Synthesis and Electrochemical Properties of Cathode Material LiNi_0.8Co_0.1Mn_0.1O₂via Li, Mg, Al Dopping

Abstract

Coprecipitation method is adopted to prepare LiNi0.8Co0.1Mn0.1O2, to discuss the factors of affecting electrochemical properties and structure at lithium ion battery cathode material LiNi0.8Co0.1Mn0.1O2. In order to improve the electrochemical properties of materials, LiNi0.8Co0.1Mn0.1O2 materials were modified by doping the cation of Li or Mg or Al. Through the charge-discharge tests in the range of 2.5~4.3V, the result show that doped Mg samples with a discharge capacity and high efficiency as well as the lowest capacity loss, the initial discharge capacity is 205.9mA.h/g, after 20 cycles the discharge capacity reached 142.4mA.h/g.

Synthesis and Characterization of Nano SnO2 Modification on LiNi0.8Mn0.1Ni0.1O2 Cathode Materials for Lithium Ion Batteries

“…Researchers have carried out many modification studies to solve the problems existing in LiNi 0.8 Mn 0.1 Co 0.1 O 2 (811), in which doping and coating are generally recognized as effective methods. Researchers believe that doping can reduce the probability of phase transition during the cycle, improve the structural stability and contribute to electrochemical performance, doping cations such as Cr 3+ , Ti 4+ , Rb + , Al 3+ , and Mg 2+ (Li et al, 2010(Li et al, , 2013Yuan et al, 2014;Du et al, 2015;Dong et al, 2017;Zhang et al, 2017). Semiconductive or insulating materials are usually adopted to coat the LiMO 2 phase because it has the functions of protecting active substances from diffusion and dissolution in electrolyte, improving electronic conductivity, ensuring surface structure stability and avoiding corrosion of anode materials.…”