Phase-doped modified single-crystal positive electrode material and preparation method thereof

The co-precipitation method and solid phase method are used to phase dopant modification and single crystallization of the nickel-cobalt-manganese cathode material, which solves the problem of lattice strain accumulation and volume change during the charge and discharge process, and achieves higher stability and electrochemical performance.

CN119650684AActive Publication Date: 2025-03-18ZHEJIANG UNIV
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Patent Information

Application Number
CN202411816548.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-18
Estimated Expiration
2044-12-11

AI Technical Summary

Technical Problem

The ternary nickel-cobalt-manganese positive electrode material has lattice strain accumulation and volume change during the charge and discharge process, resulting in structural instability and electrochemical attenuation.

Method used

Through the co-precipitation method and the solid phase method, the transition metal salt is used as the doping precursor to phase dopant and modify the Nicocobalt Manganate lithium manganate positive electrode material, and single crystallization is achieved by high-temperature solid phase method to form the La4[LiTM]O8 (TM=Ni,Co,Mn) phase.

Benefits of technology

It effectively alleviates the accumulation of lattice strain and volume changes of the positive electrode material during the charging and discharging process, improves the stability and working life of the nickel-cobalt-manganese positive electrode material, and at the same time improves the specific capacity and charge and discharge rate.

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Abstract

The invention discloses a phase-doped modified single-crystal positive electrode material and a preparation method thereof. The modified single crystal positive electrode material is Mq-LiNi < x > Co < y > Mn < z > O < 2 >; wherein M is a La4 [LiTM] O8 (TM is Ni, Co or Mn) phase. The preparation method comprises the following steps: mixing preparation raw materials of a positive electrode precursor material, preparing a precursor of the modified single-crystal positive electrode material by using a coprecipitation method, mixing the raw materials of the single-crystal positive electrode material with a modifier, and preparing the phase-doped modified single-crystal positive electrode material by using a solid phase method, and the positive electrode material is nickel cobalt lithium manganate. The transition metal salt is used for performing phase doping modification and single crystallization on the nickel cobalt lithium manganate precursor and the positive electrode material thereof, so that lattice strain accumulation and volume change of the positive electrode material in the charging and discharging process can be effectively relieved, and the working life of the nickel cobalt manganese positive electrode material is prolonged.
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