Structural, electrochemical and Li-ion transport properties of Zr-modified LiNi0.8Co0.1Mn0.1O2 positive electrode materials for Li-ion batteries

A Three in One Strategy to Achieve Zirconium Doping, Boron Doping, and Interfacial Coating for Stable LiNi0.8Co0.1Mn0.1O2 Cathode

“…that Zr could react with the residual lithium and form lithium zirconates when using Zr salt as the dopant. [ 17 ] Besides, the planes of (101) and (012) are detected, corresponding to the interplanar spacing of 0.239 and 0.235 nm, respectively, which confirms the successful synthesis of well‐crystallized Ni‐rich cathode. According to the above analysis, we can conclude that B and Zr have concurrently doped into the bulk lattice though a simple preparation process, which is beneficial for stabilizing the bulk structure of the material.…”

“…Evidently, the Zr element is well distributed throughout the material, not only in the bulk but also at the interfaces of 0.2ZB‐NCM811 sample (Figure S2e,h, Supporting Information), that is, in addition to the doping into the bulk, a portion of remained Zr on the surface can react with the lithium to form a coating layer onto the sample during the sintering. [ 17 ] However, the B element is mainly detected in the bulk (Figure S2f,i, Supporting Information), and the uniform distribution of B in the particle interior is also achieved as shown in Figure S2i, Supporting Information, demonstrating that the B is successfully doped into the crystal lattice. Moreover, the energy dispersive X‐ray analysis on the cross section of the 0.2ZB‐NCM811 is shown in Figure a.…”

Surface/Interface Structure Degradation of Ni‐Rich Layered Oxide Cathodes toward Lithium‐Ion Batteries: Fundamental Mechanisms and Remedying Strategies

“…Doping has been widely demonstrated to be the simplest approach for enhancing the structural and thermal stabilities of the Ni-rich cathodes. Typically, to date, a wide range of dopants including cations doping (Mg, [211,242] Al, [67,129,140,[243][244][245][246] Ti, [209,211] Zr, [208,[247][248][249] Nb, [250] Cd, [251] Ce, [252] Mo, [87] Ca, [253] Ta, [211] V, [254] Na [255,256] W, [257,258] and B, [132,259] ) and anions doping (F, [260,261] Cl, [262] and S, [263] ) have been introduced into the Ni-rich cathodes. The origins for the obviously improved structural stabilities by doping are closely associated with the three aspects as follows: i) the reinforcement of the bonding energy between TM ions and oxygen, ii) the suppression of the detrimental phase distortion from the layered to rocksalt structure, and iii) the promotion of the Li-ion migration thanks to increased Li slab distance by the dopants.…”

The Effects of Reversibility of H2-H3 Phase Transition on Ni-Rich Layered Oxide Cathode for High-Energy Lithium-Ion Batteries

“…During the extraction of Lithium-ion, Ni-rich materials undergoes a series of phase transitions: The original layered structure (H1) transforms to the monoclinic phase (M), the second hexagonal phase (H2), and the third hexagonal phase (H3) (He et al, 2018; Gao et al, 2019; Wu et al, 2019a). It has been reported that the H2-H3 transition will cause detrimental lattice shrinkage along the c-direction, resulting in the volume change and the local stress accumulation, and further leading to the microcracks generation and propagation in secondary particles (Lee et al, 2014; Sun and Manthiram, 2017; Yoon et al, 2018).…”