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Due to the scarcity and high cost of cobalt resources, the development of cobalt free batteries is considered to be the next stage of power battery research. Layered LiNi 0.9 Mn 0.1 O 2 has higher energy density and better magnification performance with good prospects. However, its fragile structural stability and surface interface problems result in inferior cycle performance and rate capability compared to cobalt-containing cathode materials with the same Ni content. In this study, low magnetic resistance Al3+ is used as a doping element to enhance the structure of the material and inhibit Li/Ni disordering. As expected, The Ni-rich, Co-free cathode material doped with 2 mol% Al3+ showed the best structure and interface stability, exhibiting a capacity of 166.1 mAh·g−1 at a rate of 1 C after 180 cycles in the voltage range of 2.7–4.3 V, which was higher than that of untreated LiNi 0.9 Mn 0.1 O 2 and other materials with Al3+ doping. Al3+ doping enhanced the material's rate and cycle performance. Cycling at an ultra-high rate of 5 C, the capacity retention rate reaches 86.4% after 100 cycles. The effectiveness of the modified method has been demonstrated in this study, providing a theoretical basis for the commercialization of the material to some extent. ● Al3+ enhances the structural stability of the material and reduces Li/Ni disordering. ● Significantly improved electrochemical properties of Co-free Ni-rich materials after doping with 2 mol% Al3+. Capacity retention is 86.4% after 100 cycles at 5c. ● The suppressions of the secondary particle cracking and the surface side reactions ensure the electrochemical performance of Al3+ doped Co-free Ni-rich cathode materials.. [ABSTRACT FROM AUTHOR]

The present study introduces a facile triethanolamine-assisted combustion method, wherein stoichiometric hydrate transition metal acetate with and without the addition of triethanolamine (TEA) were dissolved and mixed uniformly in deionized water and heated to burn. The ashes were then grinded and calcinated to synthesize layered LiNi 1/3 Co 1/3 Mn 1/3 O 2 cathode materials. The structure, morphology, and electrochemical performance of two kinds of LiNi 1/3 Co 1/3 Mn 1/3 O 2 materials were investigated and compared systematically. The results indicate that the sample with TEA possesses smaller particles and exhibits less aggregation and a better hexagonal layered structure. On the contrary, the sample with TEA exhibits lower polarization, a better cycling ability, a significantly improved rate performance, and better electronic conductivity. The enhanced electronic conductivity and electrochemical performance may be ascribed to a higher combustion enthalpy and better dispersion in the solvent following the introduction of TEA. This simple synthetic strategy presents a promising synthetic model for the enhancement of electrochemical performance cathode materials for lithium-ion batteries. [ABSTRACT FROM AUTHOR]

In this study, Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 cathode materials for lithium-ion battery have been successfully synthesized by triethanolamine(TEA) and ethylene glycol solution assisted co-precipitation technology and solid-state sintering method. Relevant tests (XRD, ICP, SEM) were used to determine the structure, composition and morphology of the Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 cathode materials. The electrochemical tests were performed to evaluate the electrochemical performance of the materials. The results show that the initial discharge capacity is 263.8 mAh g −1 at 0.1C rate in a half battery. Furthermore, this cathode material retains a final capacity of 186 mAh g −1 at 0.5C after 200 cycles and displays an outstanding capacity retention of 98.5%. And all tests prove that the Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 lithium-rich materials synthesized with TEA and ethylene glycol solution assisted co-precipitation method have excellent electrochemical properties. [ABSTRACT FROM AUTHOR]