Constructing a surface spinel layer to stabilize the oxygen frame of Li-rich layered oxides

Abstract

With the explosive growth of the electric energy storage industry, it is urgent to develop cathode materials with wide working voltage, high capacity, and low cost. Li-rich layered oxides have...

Review on comprehending and enhancing the initial coulombic efficiency of Li-rich Mn-based cathode materials in lithium-ion batteries

“…20 In order to address the loss of lattice oxygen in LMOs during charging, Zhang et al modified a sintering technique to stabilize lattice oxygen as the high temperature significantly promotes the diffusion of the ions in the precursor and the subsequent polycrystalline growth. 21 In terms of modification, researchers have been improving the electrochemical performance of LMO materials through structural design, 22,23 surface coating 24 and element doping. 25 So far, the structures of LMO cathode materials, including the core-shell structure, 26,27 the O 2 -type LMO cathode, 28 concentration-gradient design, 29,30 and composite structure, have made significant progress in recent decades.…”

Understanding the key role of {100} exposed crystal facets on the electrochemistry of the spinel LiMn2O4 cathode

“…Among these classes of cathode materials, manganese (Mn)-based oxides have the significant advantage of low cost because of their abundant sources. [6][7][8] In particular, the spinel cathode LiMn 2 O 4 possesses three-dimensional (3D) Li + diffusion channels and high voltages and thereby shows great potential for developing high-power and low-cost LIBs. [9][10][11][12][13][14][15][16][17] The spinel LiMn 2 O 4 with a cubic crystal structure consists of Mn 3+ and Mn 4+ .…”

Boosting the voltage/capacity stability of O2-type Li-rich layered cathodes by tailoring transition metal distribution for Li-ion batteries

“…Among these candidates, Li-rich layered oxide cathodes (LLOs) possess high capacities of above 300 mA h g −1 because of a new redox mechanism, which shows great promise for developing high-energy (≥350 W h kg −1 ) LIBs. 5–12…”

“…Among these candidates, Li-rich layered oxide cathodes (LLOs) possess high capacities of above 300 mA h g −1 because of a new redox mechanism, which shows great promise for developing highenergy (≥350 W h kg −1 ) LIBs. [5][6][7][8][9][10][11][12] Generally, traditional LLOs have an O3-type structure with an oxygen stacking sequence of ABCABC. 13 The phase structure of LLOs is usually regarded as the solid solution of Li 2 MnO 3 and LiTMO 2 (TM = Ni, Co, and Mn).…”