Multielement composite cathode material for lithium secondary battery and preparation method thereof

A lithium secondary battery and multi-element composite technology, which is applied to battery electrodes, electrical components, circuits, etc., can solve the problems of incomplete reaction, high-temperature gas expansion of ternary positive electrode materials, etc., and achieve improved structural stability, cycle performance and Thermal stability, low inflation effect
CN102420322BActive Publication Date: 2013-11-20HUNAN SHANSHAN NEW ENERGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUNAN SHANSHAN NEW ENERGY CO LTD
Publication Date
2013-11-20

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Abstract

A multielement composite cathode material for a lithium secondary battery and a preparation method thereof. The chemical formula of the multielement composite cathode material for a lithium secondary battery is LiaNixCoyMn1-x-yMzO2(PO4)b, wherein M is selected from one or two elements of Mg, Al, Zr, Ba. Sr and B; 0.8<=a<=1.2; 0<x<1; 0<y<1; x+y<=1; 0.0005<=z<=0.02; 0<b<=0.02. The preparation method comprises the following steps: weighing NixCoyMn1-x-y(OH)2, lithium salts or lithium oxide or lithium hydroxide, and compounds containing the element M, mixing, sintering at 700-950 DEG C for 6-24 hours, cooling, crushing, sieving to obtain a compound A expressed as LiaNixCoyMn1-x-yMzO2; testing residual lithium element content of the compound A, adding a phosphorus-containing compound, performing heat treatment at 300-900 DEG C for 2-10 hours, cooling, crushing, and sieving. The multielement composite cathode material for a lithium secondary battery has good cycle performance, and low expansion; a cathode of a lithium secondary battery prepared by the material has good working performance.
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Description

technical field

[0001] The invention relates to a positive electrode material for a lithium secondary battery and a preparation method thereof, in particular to a multi-component composite positive electrode material for a lithium secondary battery and a preparation method thereof. Background technique

[0002] Nickel cobalt lithium manganese oxide is a ternary doped lithium ion battery cathode material, which integrates LiCoO 2 , LiNiO 2 and m -LiMnO 2 The characteristics of the three layered materials, its performance is better than any of the above single-component positive electrode materials, and there is an obvious ternary synergistic effect: by introducing Co, it can reduce the mixed cation occupancy and effectively stabilize the layered structure of the material; The introduction of Ni can increase the capacity of the material; by introducing Mn, not only can the cost of the material be reduced, but also the safety of the material can be improved. The basic physi...

Claims

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