Synthesis of LiNi_0.8Co_0.15Al_0.05O₂ with 5-sulfosalicylic acid as a chelating agent and its electrochemical properties

Abstract

Spherical LiNi0.8Co0.15Al0.05O2 (LNCA) cathode material with excellent electrochemical performance for lithium-ion batteries is successfully synthesized with the precursor of Ni0.8Co0.15Al0.05(OH)2 (NCA) prepared from a continuous co-precipitation method. A more environmentally friendly chelating agent, 5-sulfosalicylic acid (SSA, H3L), stabile as well as non-toxic, is firstly adapted in our synthesis process instead of traditional NH3·H 2O. Thermodynamics of the precipitation from the Ni(II)-Co(II)-Al(III)-SSA-H2O system at 298 K are systematically investigated through thermodynamics model analysis. The results demonstrate that stoichiometric spherical Ni0.8Co0.15Al0.05(OH)2 precursor can be obtained at pH=11~13, with the SSA concentration from 0.05mol L -1 to 0.5mol L -1 . LiNi0.8Co0.15Al0.05O2 prepared from the precursor has an initial discharge specific capacity of 203.1mAh g -1 at 0.1C and capacity retention of 93.3% after 200 cycles when cycled at 1 C between 3.0 and 4.3 V, as well as excellent rate capability. The electrochemical performances are superior to that prepared by using ammonia as chelating agent. It is expected that LiNi0.8Co0.15Al0.05O2 cathode material can be synthesized by a more environmentally friendly method.Please do not adjust margins Please do not adjust margins Scheme1. Prepare Ni0.8Co0.15Al0.05(OH)2 by the co-precipitation method using SSA as chelating agent.

LiNi0.8Co0.15Al0.05O2: Enhanced Electrochemical Performance From Reduced Cationic Disordering in Li Slab

“…As can be seen from the figure, all samples show three pairs of reduction and oxidation peaks, which are caused by the complex three phase transitions of hexagonal phase to monoclinic phase (H1-M), monoclinic phase to hexagonal phase (M-H2), and hexagonal phase to hexagonal phase (H2-H3) during the extraction and insertion of lithium ion. Such findings are consistent with the earlier reports from Xie, H 19, 25 and Zhou, P 26 . In the H1-M redox peaks, the sample of redox voltage gap is 0.1779 V, 0.1564 V, 0.1179 and 0.1485 V, respectively.…”

“…However, there are few ways to solve above problems at the same time by optimizing the synthesis method. Xie, H 19 et al . reported a synthesis method with 5-sulfosalicylic acid as a chelating agent to solve the ion pollution.…”

Facile Fabrication of Ethoxy-Functional Polysiloxane Wrapped LiNi0.6Co0.2Mn0.2O2 Cathode with Improved Cycling Performance for Rechargeable Li-Ion Battery

“…After charge-discharge testing, the R f and R ct of 2 mol% E-NCM are 43.99 Ω and 221.10 Ω, respectively, and are smaller than those of the NCM 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 E-NCM has less irreversible capacity loss to format the SEI film and a higher coulombic efficiency than does the NCM at the 1 st cycle. 54 The potential interval value ∆E is often used to represent the electrode polarization. The ∆E 2 of E-NCM at the 2 nd cycle is 0.082 V, which is slightly higher than that of the pristine NCM (0.072 V).…”

Enhancing the Thermal and Upper Voltage Performance of Ni-Rich Cathode Material by a Homogeneous and Facile Coating Method: Spray-Drying Coating with Nano-Al2O3

“…Thus, intensive researches have been implemented on the LIBs to meet the demand with a higher degree of lithium utilization and specific energy density [3][4][5] . As cathode materials used in the LIBs are the core to the performance, most research efforts have been focused on them, either to develop alternative cathode materials, or to modify the available ones [6][7] . Layered lithium Ni-rich compounds LiNi 1-x M x O 2 (0.1<x<0.5, M = Mn, Co, Al and so on) are considered as promising candidates to meet such requirements for the next generation LIBs for their relatively 3 high capacity (>180 mAh g -1 ) as well as more accessible to the conventional LiCoO 2 [8][9][10] .…”