Coated lithium ion sieve and its manufacturing method

A coated lithium ion sieve with a 2-4 nm coating layer on a spinel-type inner shell addresses manganese dissolution issues, enhancing adsorption capacity and stability, and achieves efficient lithium ion insertion and extraction, and maintaining cycle stability.

JP7783813B2Active Publication Date: 2025-12-10LIS (SHANGHAI) MATERIALS TECHNOLOGY CO LTD
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Patent Information

Application Number
JP2022531507
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2020-12-23
Filing Date
2021-10-09
Publication Date
2025-12-10
Estimated Expiration
2041-10-09

AI Technical Summary

Technical Problem

Lithium manganese oxide (LMO) spinel materials suffer from manganese dissolution, which reduces adsorption capacity and contaminates desorption solutions, limiting their industrial applications.

Method used

A coated lithium ion sieve comprising an inner shell and a coating layer, where the coating is made of Li2O, Li2MnO3, or MnO2, with a thickness of 2 to 4 nm, is manufactured through a process involving calcination, mixing, hydrothermal reaction, ultrasonication, and oxidation treatment to enhance structural stability and reduce manganese dissolution.

Benefits of technology

The coated lithium ion sieve achieves high adsorption capacity, low manganese dissolution loss, and improved cycle stability, maintaining structural integrity and facilitating lithium ion insertion and extraction.

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Abstract

The present invention provides a method for preparing a coated lithium ion sieve, which includes the steps of: Step 01: calcining manganese salt in air atmosphere for 2-10 hours to obtain Mn2O3; Step 02: mixing and grinding Mn2O3 and lithium salt, reacting in autoclave at 100-200°C for 36-72 hours to obtain product LiMnO2, the molar ratio of Li / Mn in Mn2O3 and lithium salt is 1-10:1; Step 03: adding LiMnO2 to metal-coating reagent, ultrasonicating for 2-10 hours, drying for 6-24 hours, and calcining at 400-600°C for 2-10 hours to obtain oxide-coated LiMnO2. 1.6 Mn 1.6 Step 03: obtaining a lithium ion adsorbent, the molar ratio of the metal coating reagent to LiMnO2 being 0.01-0.08:1; 1.6 Mn 1.6 and step 04 of oxidizing the O4 lithium ion adsorbent, washing and drying the product after oxidation to obtain a coated lithium ion sieve. The coated lithium ion sieve of the present invention has a more stable structural lattice, which solves the problem that the HMn2O4 lithium ion sieve in the prior art is easily dissolved and lost, and can be used repeatedly.
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Citation Information

Patent Citations

  • Zirconium dioxide-coated manganese lithium ion sieve as well as preparation method and application thereof

    CN107376827A

  • Positive electrode active material for lithium secondary battery, its manufacturing method and lithium secondary battery using the same

    JP2003168431A

  • Lithium extraction using coated ion exchange particles

    JP2019535503A