High-Rate Structure-Gradient Ni-Rich Cathode Material for Lithium-Ion Batteries

Abstract

To simultaneously achieve high compaction density and superior rate performance, a structure-gradient LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode material composed by a compacted core and an active-plane-exposing shell was designed and synthesized via a secondary co-precipitation method successfully. The tight stacking of primary particles in the core part ensures high compaction density of the material, whereas the exposed active planes, resulting from the stacking of primary nanosheets along the [001] crystal axis predominantly, in the shell region afford enhanced Li + transport. Thus, this structure-gradient Nirich cathode material shows a high compaction density with excellent electrochemical performances, especially the rate performance, exhibiting excellent rate capability (160 mA h g −1 at 10 C), which is 62% larger than that of the pristine material within 2.75−4.3 V (vs Li + /Li). Our work proposes a possible strategy for designing and synthesizing layered cathode materials with the required hierarchical structure to meet different application requirements.

Clean the Ni-Rich Cathode Material Surface With Boric Acid to Improve Its Storage Performance

“…All the samples were assembled into CR2025 coin-type half cells, which consist of lithium metal anode and a commercial Celgard 2500 separator. The manufacturing details of cathode electrode and cells were kept the same with our previous work (Su et al, 2019 ). The electrochemical cycling tests (2.75–4.3 V, vs. Li + /Li) and the potentiostatic intermittent titration technique (PITT) experiments of cells were operated on the CT2001A Land Instruments (Wuhan, China) at room temperature.…”

Research Progress on the Surface of High-Nickel Nickel–Cobalt–Manganese Ternary Cathode Materials: A Mini Review

“…A material synthesized by the co-precipitation method has a small and uniform particle size and is typically used for coating the high-nickel NCM ternary cathode material and for the synthesis of the core-shell structure. For example, the following are prepared by co-precipitation method: LiNi 0.6 Mn 0.2 Co 0.2 O 2 (Ren et al, 2017 ), LiNi 0.8 Mn 0.8 Co 0.1 O@Li 3 PO 4 @PPy (Chen S. et al, 2017 ), Li[(Ni 0.8 Co 0.1 Mn 0.1 ) 1−x (Ni 0.5 Mn 0.5 ) x ]O 2 (Sun et al, 2006a ), LiNi 0.8 Co 0.1 Mn 0.1 O 2 @x[Li-Mn-O] (Li et al, 2018 ), and LiNi 0.8 Co 0.1 Mn 0.1 O 2 @active material core-shell material (Su et al, 2019 ). High temperature solid phase method is typically used for doping modification, as follows: Ca doping LiNi 0.8(1−x) Co 0.1 Mn 0.1 Ca 0.8x O 2 (Chen M. et al, 2017 ), Mn doping LiNi 0.82−x Co 0.12−x Mn 0.06+2x O 2 (Cho et al, 2018 ), and Mo doping LiNi 0.6 Co 0.2 Mn 0.2 O 2 (Xue et al, 2018 ).…”

Advances and Prospects of Surface Modification on Nickel‐Rich Materials for Lithium‐Ion Batteries†

“…Similar to blending the different cathode materials in the dry coating method, the core‐shell structure [ 130 ] or structure‐gradient [ 131 ] Ni‐rich materials also could be regarded as a special wet‐ coating modification. This surface modification could combine the advantages of the core materials and the shell materials, which exhibits better cycling performance than the traditional materials.…”