Modification method of lithium-rich cathode material

A technology of lithium-rich positive electrode materials and positive electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of reducing the discharge capacity of materials, achieve low cost, increase rate capacity, and reduce the effect of irreversible capacity loss for the first time
CN102969495AInactive Publication Date: 2013-03-13IRICO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
IRICO
Publication Date
2013-03-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a surface modification method of lithium ion battery cathode material, and especially a modification method of a lithium-rich cathode material. The method is characterized by comprising the following steps: preparing a lithium ion battery cathode material Li [NixLi1 / 3-2x / 3Mn2 / 3-x / 3] O2, wherein x satisfies the relation of 1 / 5<= x<=1 / 3; dispersing the lithium-rich cathode material in a FeC2O4 solution with concentration no higher than 0.95g / L in and treating the solution with ultrasound for 0.5-5 h, then stirring for 0.5-5 h, dropwise adding NH4H2PO4 solution with concentration no higher than 0.76g / L, and completely drying the obtained slurry at 80-150 DEG C; and sintering at 200-700 DEG C for 4-15 h to obtain FePO4 surface modified lithium ion battery cathode material. The invention has advantages of simple process, low temperature heat treatment, simple operation and low cost, and is suitable for large-scale industrial production.
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Description

technical field

[0001] The invention relates to a method for modifying the surface of a positive electrode material of a lithium ion battery, in particular to a method for modifying a lithium-rich positive electrode material. Background technique

[0002] In recent years, under the environment of soaring gasoline prices and global advocacy of new energy, energy saving and emission reduction, and low-carbon economy, lithium-ion batteries with high energy density and high power density have become the focus of attention. Inexpensive and abundant iron-based and manganese-based cathode materials become the most promising candidates, LiFePO 4 and LiMn 2 o 4 As a cathode material, it has been widely used, but due to the limitation of the theoretical capacity of these two materials, the energy density is low. Layered lithium-rich manganese-based cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 (M=Co,Ni 1 / 2 mn 1 / 2 …) have attracted extensive attention due to their high voltage and ...

Claims

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