Effects of Oxygen Pressurization on Li/Ni Cation Mixing and the Oxygen Vacancies of LiNiCoAlO Cathode Materials.

Ni-rich cathode materials are a low-cost and high-energy density solution for high-power lithium-ion batteries. However, Li/Ni cation mixing and oxygen vacancies are inevitably formed during the high-temperature calcination process, resulting in a poor crystal structure that adversely affects the electrochemical performance. In this work, the LiNiCoAlO cathode material with a regular crystal structure was prepared through oxygen pressurization during lithiation-calcination, which effectively solved the problems caused by the high calcination temperature, such as oxygen loss and a reduction of Ni.

Simple Strategy for Synthesizing LiNiCoAlO Using CoAl-LDH Nanosheet-Coated Ni(OH) as the Precursor: Dual Effects of the Buffer Layer and Synergistic Diffusion.

Ni-rich layered oxide LiNiCoAlO is a promising cathode material for high-power lithium-ion batteries due to its high energy density and low cost. However, obtaining LiNiCoAlO with a large and uniform particle size and without undesired Al-related phases using some conventional synthesis methods is quite difficult. These problems seriously affect the electrochemical performance of LiNiCoAlO, thus impeding its wide application.

The Synthesis of LiMnFePO₄/C Cathode Material through Solvothermal Jointed with Solid-State Reaction.

LiMnFePO₄/C material has been synthesized through a facile solid-state reaction under the condition of carbon coating, using solvothermal-prepared LiMnPO₄ and LiFePO₄ as precursors and sucrose as a carbon resource. XRD and element distribution analysis reveal completed solid-state reaction of precursors. LiMnFePO₄/C composites inherit the morphology of precursors after heat treatment without obvious agglomeration and size increase.