Revealing the Dual Role of Ammonia in the Hydroxide Co-Precipitation Synthesis of Cobalt-Free Nickel-Rich LiNiMnAlO (NMA955) Cathode Materials for Lithium-Ion Batteries.

Nickel-rich cobalt-free LiNiMnAlO (NMA955) is considered a promising cathode material to address the scarcity and soaring cost of cobalt. Particle size and elemental composition significantly impact the electrochemical performance of NMA955 cathodes. However, differences in precipitation rates among metal ions coveys a challenge in obtaining cathode materials with the desired particle size and composition via hydroxide co-precipitation synthesis.

Interface Analysis of LiCl as a Protective Layer of LiAlTi(PO) for Electrochemically Stabilized All-Solid-State Li-Metal Batteries.

Regardless of the superiorities of LiAlTi(PO) (LATP), such as stability against oxygen and moisture, high ionic conductivity, and low activation energy, its practical application in all-solid-state lithium metal batteries is still impeded by the formation of ionic-resistance interphase layers. Upon contact with Li metal, electron migration from Li to LATP causes the reduction of Ti in LATP. As a result, an ionic-resistance layer will be formed at the interface between the two materials.

Effect of HSO/HO pre-treatment on electrochemical properties of exfoliated graphite prepared by an electro-exfoliation method.

The effect of pre-treating graphite sheets in a HSO/HO solution before electro-exfoliation is reported. It was revealed that the volume fraction of HSO to HO during pre-treatment could control the degree of exfoliation of the resulting exfoliated graphite (EG). X-ray diffraction (XRD), Raman, and Fourier transform infrared (FTIR) spectroscopy analyses have suggested that EG produced by first pre-treating the graphite sheet in HSO/HO solution with the HSO : HO volume fraction of 95 : 5 demonstrates the highest exfoliation degree.