Synthesis and performance of P2-O3 composite-phase Li-rich Mn-based cathode materials

doi:10.19799/j.cnki.2095-4239.2020.0021

Abstract

Abstract:

To solve the common issues of voltage decay, low initial coulombic efficiency, and poor rate performance that occur in high-energy lithium-rich cathode materials, a P2-O3 composite-phase cathode material was synthesized by the simple solid-state method. During the first charging and discharging process, this material experienced P2-O2 phase transition, and the O2 phase prevented transition metal migration; thus, voltage decay was effectively mitigated. This P2-O3 composite-phase cathode material delivered a specific capacity of over 290 mA·h/g with an initial coulombic efficiency of 97% under a current density of 0.1C (1C = 200 mA/g) at 2.0—4.6 V. When charged at 200 mA/g, this material released a capacity of about 240 mA·h/g. After 100 cycles, the capacity retention was approximately 80% and the voltage loss was less than 170 mV. This material is easy to synthesize. At 2.0—4.6 V, it delivered a capacity as high as that of traditional lithium-rich materials tested at 2.0—4.8 V, which greatly promotes the adaptation of lithium-rich materials with commercial electrolytes. Furthermore, the cycle performance is relatively optimum and the voltage decay is suppressed to some extent, which strongly promotes the practical application of lithium-rich materials in the electric vehicles market.

Key words: composite phase, Li-rich Mn-based cathode material, voltage decay, initial coulombic efficiency

CLC Number:

TM 912.9

ZHANG Jianyu, LU Liping, YU Zhihui, SONG Jin, XIA Dingguo. Synthesis and performance of P2-O3 composite-phase Li-rich Mn-based cathode materials[J]. Energy Storage Science and Technology, 2020, 9(2): 346-352.

Figures/Tables 7

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样品	R _s	R _SEI	R _CT
Na-LMNC	3.174	25.47	6.867
Li_1.2Mn_0.54Ni_0.13Co_0.13O₂	3.321	80.59	281.4

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