A Novel Core-shell Structured Nickel-rich Layered Cathode Material for High-energy Lithium-ion Batteries

Abstract

For enhancing the electrochemical properties of lithium transition-metal oxide, a novel core-shell structured cathode material LiNi Co Mn O @V O was designed and synthesized. The precursor of the material was made of metal hydroxide in the interior and metal 0.75 0.12 0.13 2 2 5 carbonate in the exterior, and with full concentration gradient structure. In this cathode material, the core was the high-Ni material, and the shell was the high-Mn material. The sphere material was coated and penetrated by V O due to the existence of pores. Furthermore, the material was 2 5 also doped by vanadium element. These were investigated and confirmed by X-ray diffraction, Focused Ion beam, EDS, TEM, etc. The 3 wt% V O-coated sample exhibited a remarkable cycling performance, with capacity retention of 86.5% at the current rate of 1 C after 100 cycles. 2 5 Besides, the rate capability of the V O-coated sample was obviously enhanced at high rates (2, 5 and 10 C). The interfacial charge transfer 2 5 resistance of the material after cycling was obviously decreased by V O coating. The cyclic voltammetry analysis showed that the interfacial 2 5 polarization of the material was inhibited due to V O coating.

The role of metal substitutions in the development of Li batteries, part I: cathodes

“…18 Alternatively, performance can be improved using a coreshell structure, or a core-gradient-shell structure. [260][261][262][263][264][265][266][267] The idea behind a core-shell particle is to have high energy density cathode material in the core, surrounded by a more stable, yet still active, cathode material to protect the core from degradation (Fig. 22a-c).…”

Technologies of lithium recycling from waste lithium ion batteries: a review

“…From the first commercialization in 1991, the lithium-ion battery has been a core energy technology and it has been continuously researched for several decades for the development of the future energy market. [1][2][3][4][5][6][7] Lithium is attracting attention as it is a key element of lithium-ion batteries. However, lithium is not evenly distributed around the world and is a limited element.…”

A process of leaching recovery for cobalt and lithium from spent lithium-ion batteries by citric acid and salicylic acid

“…The "inorganic acid + reducing agent" system is widely used, but harmful gases will be produced in the process of acid leaching, and the waste acid aer leaching is difficult to treat, which will pose potential harm to the environment. 19,20 At this time, the leaching system "organic acid + reducing agent" emerges as required in modern times. Therefore, research using organic acid systems for efficient recovery spent LIBs has become a new research focus.…”