Progress on Modification Strategies of Layered Lithium-Rich Cathode Materials for High Energy Lithium-Ion Batteries

In Situ Doping Polyanions Enables Concentration-Gradient Ni-Rich Cathodes for Long-Life Lithium-Ion Batteries

“…Oxygen release caused by electron transfer between highly reactive Ni 4+ on the surface and O n‑ at the end of charging can trigger thermal runaway of the battery. − To monitor the gas release in real-time, the in situ differential electrochemical mass spectrometry (DEMS) images of three samples are provided in Figure a. The onset potentials of gas evolution (O 2 and CO 2 ) of the three samples are all around 4.2 V. Compared with the massive evolution of the O 2 and CO 2 in NCM, the gas evolution in GNCM is suppressed to a certain extent, and after further modification by SiO 4 4– doping, there is only a trace amount of the CO 2 evolution in GNCM-Si.…”

Modification Strategies and Challenges of High‐Performance Lithium‐Rich Manganese‐Based Cathode Materials

“…[ 12 ] There is a view that the degree of structural order in oxide materials directly influenced their properties. [ 13 ] However, in 2014, Ceder et al discovered that the disordered halite material Li 1.211 Mo 0.467 Cr 0.3 O 2 exhibited exceptional cycle performance and specific capacity, challenging the previous understanding of the structure–activity relationship. [ 14 ] In the study of Anton Van der Ven et al tetrahedral clusters formed by Li + and transition metal (TM) ions can be roughly divided into the following types [ 15 ] : 1) a single Li + ion occupies one position in the tetrahedral cluster, 2) a single TM ion occupies one position in the tetrahedral cluster, 3) a single Li + ion and a single TM ion simultaneously occupy two different positions in the tetrahedral cluster, 4) a single Li + ion and multiple TM ions simultaneously occupy multiple different positions in the tetrahedral cluster, 5) multiple Li + ions and multiple TM ions simultaneously occupy multiple different positions in the tetrahedral cluster.…”

“…There are mainly two methods used to enhance the multiplication properties of materials. [ 13 ] One approach is to decrease the grain size of primary particles to achieve a shorter Li + diffusion length, a larger contact area, and more active sites. The other method is surface modification, which aims to hinder the dissolution of TM ions into the electrolyte and prevent the formation of a surface passivation layer.…”

Acid-scavenging separators promise long-term cycling stability of lithium-ion batteries

“…Cathode and anode materials with high capacity and low cost play a vital role in the development of LIBs. 1,40 Currently available cathode materials with high capacity and high voltage include: layered lithium cobalt oxides LiCoO 2 (LCO), [41][42][43] advanced derived materials LiNi x-Co y Mn 1ÀxÀy O 2 (NCM) and Ni-rich layered oxides, [44][45][46] and spinel LiNi 0.5 Mn 1.5 O 4 (LNMO) materials. 47,48 For the anode, graphite and Si-based materials are used successfully in commercial applications in high-energy-density LIBs.…”