Cr/Mo co-doped regulation on structure and electrochemical performance in Li-rich manganese-based cathode materials

doi:10.19799/j.cnki.2095-4239.2024.1120

Abstract

Abstract:

Li-rich manganese-based cathode material has a higher capacity (>250 mAh/g) than common commercial cathode materials, but it is plagued by severe voltage decay, surface phase transitions, and lattice oxygen evolution during cycling. To address these issues, this paper designs a Cr/Mo co-doped Li_1.2Ni_0.167Co_0.167Mn_0.666O₂ (LLO) cathode material using a high-temperature solid-state method. The results show that stability and electrochemical performance are improved after this modification. On one hand, the large ionic radius of Mo⁶⁺ increases lattice spacing, while Cr doping stabilizes the layered structure. Conversely, the higher bond energies of Cr—O and Mo—O effectively mitigate structural distortion, resulting in reduced transition metal migration and oxygen release. Moreover, abundant surface oxygen vacancies lower irreversible oxygen redox. Electrochemical measurements display that the cycle performance and rate capability of LLO-CM1 are enhanced. In particular, LLO-CM1 delivers an initial discharge specific capacity of 272.7 mAh/g and maintains 177.7 mAh/g after 200 cycles in the voltage range of 2—4.8 V at 1 C, corresponding to a capacity retention of 84.0%, while an average discharge specific capacity of 102.0 mAh/g is delivered even at 10 C. The co-doped strategy sheds light on designing Li-rich manganese-based cathode materials.

Key words: lithium-ion battery, layered oxide, Li-rich manganese-based, doping, oxygen vacancies

CLC Number:

TQ 152

Huiming CHEN, Yijia CAI, Wenji YIN, Meifeng CHEN, Youguo HUANG, Sijiang HU, Hongqiang WANG, Qingyu LI. Cr/Mo co-doped regulation on structure and electrochemical performance in Li-rich manganese-based cathode materials[J]. Energy Storage Science and Technology, 2025, 14(3): 1123-1132.

Figures/Tables 8

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Table 1

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样品	I(003)/I(104)
LLO	1.35
LLO-CM	1.42
LLO-CM1	1.56
LLO-CM2	1.49

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