Extensive comparison of doping and coating strategies for Ni-rich positive electrode materials

Controlling the Microstructure of Cobalt-Free, High-Nickel Cathode Materials with Dopant Solubility for Lithium-Ion Batteries

“…Various dopant elements, such as Mg, Co, Mn, Al, Ti, Fe, and Zr, have been examined in high-nickel layered oxides. − These elements are widely used as dopants to enhance structural stability as they have some solubility in the host structure. However, as mentioned above, the surface stability of the cathodes decreases as the nickel content increases. , In this regard, investigations on simultaneously modifying the structure and surface with dopants that have low solubility in the host structure have been recently reported. ,− This approach is quite promising in that it does not require additional coating processes often employed with conventional cathodes.…”

Conductive polymer polyaniline covering promotes the electrochemical properties of a nickel-rich quaternary cathode LiNi0.88Co0.06Mn0.03Al0.03O2

“…The coating layer is applied on the particles to reduce the contact of electrode and electrolyte, and then eliminate surface residual alkali compounds such as Li 2 CO 3 and LiOH, so as to inhibit the occurrence of interface side reactions and maintain the structure and cycle stability of the materials. 11–13 However, the traditional covering materials, such as oxides, fluorides and phosphate compounds etc. , are composed of plenty of inorganic nanoparticles, and by-products originating from the electrolyte could permeate and pass through the covering film, resulting in destruction of cathode structure after working for a long time.…”

“…The coating layer is applied on the particles to reduce the contact of electrode and electrolyte, and then eliminate surface residual alkali compounds such as Li 2 CO 3 and LiOH, so as to inhibit the occurrence of interface side reactions and maintain the structure and cycle stability of the materials. [11][12][13] However, the traditional covering materials, such as oxides, fluorides and phosphate compounds etc., are composed of plenty of inorganic nanoparticles, and by-products originating from the electrolyte could permeate and pass through the covering film, resulting in destruction of cathode structure after working for a long time. [14][15][16][17] In comparison with the inorganic covering materials, conductive polymers have demonstrated obvious superiority in terms of rapid electronic conductivity and prominent environmental stability, enabling them to effectively and enduringly maintain cathode structure stability and increase the rate performance of Ni-rich cathodes.…”

Dual-Site Doping of Cu2+ Enables High Voltage Stability and Rate Performance of Single-Crystal LiNi0.5Co0.2Mn0.3O2 for Li-Ion Batteries

“…An inactive element doping strategy has been proven to be effective in alleviating the above drawbacks . By introduction of electrochemically inert metal elements into the material, the structure of the SC material can be stabilized, the lattice parameter c can be expanded, and the transport of Li + can be promoted .…”