硼酸锂包覆改性尖晶石锰酸锂的研究

doi:10.19964/j.issn.1006-4990.2021-0738

Abstract

Abstract:

Spinel lithium manganate is a research hotspot of cathode materials for lithium?ion batteries because of its excellent safety performance and low cost.However，the degradation of cycle performance caused by manganese dissolution is the main obstacle to the development of lithium manganite.With the increase of temperature，the dissolution of manganese intensifies，so the deterioration of the battery is more serious under high temperature conditions.Coating lithium borate on the surface of lithium manganate can inhibit the dissolution of manganese.Lithium borate can be uniformly coated on the surface of lithium manganate by high?energy ball milling.X-ray diffraction and electrochemical impedance spectroscopy showed that lithium borate would not cause the change of lithium manganate structure and the increase of battery impedance.Through the study of interface transfer resistance，it was found that the polarization of the battery would increase when the coating amount of lithium borate exceeded 2%（mass fraction），so the optimal coating amount of lithium borate was controlled at 2%.Compared with uncoated lithium manganate，coated lithium manganate showed excellent cycle performance for both lithium half battery and graphite full battery.especially at 60 ℃，the cycle performance was greatly improved.The volume energy density of soft packed full battery reached 308 W·h/L，and the capacity retention rate could reach 94.7% after 200 cycles at 1C.The coating of lithium borate could effectively inhibit the dissolution of manganese in lithium manganate and improve its cycle performance.

Key words: Li₃BO₃, LiMn₂O₄, lithium?ion battery, coating

CLC Number:

O646.542

LIU Zhuoqin,ZHOU Xiaochong,MO Liangjun. Study on modification of spinel lithium manganate coated with lithium borate[J]. Inorganic Chemicals Industry, 2022, 54(9): 90-95.

Figures/Tables 9

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项目		R₁/Ω	R₂/Ω	R₃/Ω
25 ℃	未包覆	11.3	3.2	17.7
25 ℃	Li₃BO₃包覆	11.5	3.8	17.9
60 ℃	未包覆	11.4	8.6	18.1
60 ℃	Li₃BO₃包覆	11.1	3.3	17.6

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on modification of spinel lithium manganate coated with lithium borate

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