Enhanced Electrochemical Performance of Li-Rich Layered Cathode Materials by Combined Cr Doping and LiAlO₂ Coating

Abstract

A Li-rich layered cathode material Li 1.2 Ni 0.2 Mn 0.6 O 2 with enhanced electrochemical performance has been fabricated by combining the Cr doping and LiAlO 2 coating. The structural characterization shows the perfect layered crystal structure. The 3 wt % LiAlO 2 -coated Li 1.2 Ni 0.16 Mn 0.56 Cr 0.08 O 2 shows the highest discharge specific capacity and the best cycling stability among different coating levels. The first discharge specific capacity is enhanced from 230.4 mAhg −1 to 268.8 mAhg −1 .The capacity retention ratio is improved from 92.7% to 97.3% after 100 cycles. The spinel phase is suppressed effectively in the 3 wt % LiAlO 2 -coated Li 1.2 Ni 0.16 Mn 0.56 Cr 0.08 O 2 . The midpoint voltage value of Li 1.2 Ni 0.2 Mn 0.6 O 2 after 100 cycles is enhanced from 2.746 to 3.128 V with Cr doping and LiAlO 2 coating. The lower R ct (charge transfer resistance) and higher D Li + (ion diffusion coefficient) of 3 wt % LiAlO 2 -coated Li 1.2 Ni 0.16 Mn 0.56 Cr 0.08 O 2 contribute to the excellent rate capability. The results suggest that ion doping combined with fast ion conductor coating is an effective way to enhance the electrochemical properties of the Li-rich layered cathode materials.

Freestanding graphitic carbon nitride‐based carbon nanotubes hybrid membrane as electrode for lithium/polysulfides batteries

“…The current lithium ion battery technology, based on transition metal oxides as the cathodes and nanoengineered carbon materials as anodes, has limited energy storage capacity . Lithium sulfur batteries, which perform an exceptional theoretical capacity (1675 mAh g −1 ) and specific energy density (2600 Wh kg −1 ), are a promising representative of the next‐generation high energy storage systems .…”

“…The current lithium ion battery technology, based on transition metal oxides as the cathodes and nanoengineered carbon materials as anodes, has limited energy storage capacity. 1,2 Lithium sulfur batteries, which perform an exceptional theoretical capacity (1675 mAh g −1 ) and specific energy density (2600 Wh kg −1 ), are a promising representative of the next-generation high energy storage systems. 3 However, there are still few technical challenges to the commercialization of lithium sulfur batteries, such as poor conductivity of kinetics of sulfur, shuttle effect of redox reaction intermediates, and volume expansion due to density differences between sulfur and Li 2 S. 4,5 Recently, many efforts have been made by researchers to address the above problems.…”

Fabrication of SiOx-G/PAA-PANi/Graphene Composite With Special Cross-Doped Conductive Hydrogels as Anode Materials for Lithium Ion Batteries

“…Compared with Si-based materials, SiO x -based anodes are prone to achieve remarkable electrochemical performance due to the formation of Li 2 O and Li silicates, which can form the stable solid electrolyte interphase (SEI) layer and adapt to the volume expansion of SiO x during the insertion of Li + (Nguyen et al, 2013;Xu et al, 2017;Liu D. et al, 2019;Liu Y. et al, 2019b;Zheng et al, 2019). Although the capacity of SiO x is high, the volume multiplication usually causes this material to crack and pulverize.…”

Hydrothermal Synthesis of Tunable Olive‐Like Ni0.8Co0.1Mn0.1CO3 and its Transformation to LiNi0.8Co0.1Mn0.1O2 Cathode Materials for Li‐Ion Batteries

“…In the present world, rechargeable lithium ion batteries (LIBs) have received great attention due to its high energy density, long cycle life, low self‐discharge, non‐memory effect as well as environmental friendliness, and it is a trend that LIBs have become the primary choice of green secondary batteries for 3 C digitals, electric tools, electric bicycles, electric vehicles and energy storage systems . As far as LIBs are concerned, cathode materials significantly affect the electrochemical performance, energy density and cost of the whole battery system .…”

“…In the present world, rechargeable lithium ion batteries (LIBs) have received great attention due to its high energy density, long cycle life, low self-discharge, non-memory effect as well as environmental friendliness, and it is a trend that LIBs have become the primary choice of green secondary batteries for 3 C digitals, electric tools, electric bicycles, electric vehicles and energy storage systems. [1][2][3][4][5][6][7][8] As far as LIBs are concerned, cathode materials significantly affect the electrochemical performance, energy density and cost of the whole battery system. [9,10] With the large-scale industrialization of high-energy LIBs increasingly grown, requirements for high energy density are becoming more and more strict, the commonly used cathode materials with relatively low practical discharge specific capacity, such as layered LiCoO 2 (~140 mAh g À 1 , upper cutoff voltage of 4.2 V), [11] spinel LiMn 2 O 4 (~120 mAh g À 1 ), [12] and olivine LiFePO 4 (~170 mAh g À 1 ), [13] cannot satisfy the demands of electric vehicles and energy storage systems.…”