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

A lithium secondary battery, multi-component composite technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of high-temperature gas swelling and incomplete reaction of ternary positive electrode materials, improve cycle performance and thermal stability performance, improve Structural stability, low inflation effect

Active Publication Date: 2012-04-18
HUNAN SHANSHAN NEW ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But due to the presence of TiO in the reaction 2 The introduction of TiO 2 It is a relatively active substance, which will cause the decomposition of the electrolyte. If TiO 2 Incomplete reaction with residual 1000ppm lithium carbonate will lead to Li-containing 2 TiO 3 The ternary cathode material has the problem of high temperature gas expansion

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The lithium secondary battery of the present embodiment is used multi-component composite cathode material, and its chemical formula is Li 1.08 Ni 2 / 5 co 1 / 5 mn 2 / 5 Mg 0.01 o 2 (PO 4 ) 0.0027 , in powder form.

[0021] Its preparation method:

[0022] (1) Weigh Ni 2 / 5 co 1 / 5 mn 2 / 5 (OH) 2 Represented nickel-cobalt-manganese compound (average particle size D50=10.0μm measured by laser particle size analyzer, tap density 2.05g / cm 3 , spherical powder particles) 280.00g, lithium carbonate 122.19g and magnesium carbonate 2.57g, dry mixed, placed in a muffle furnace, and then sintered at 900°C for 10h, cooled, crushed, sieved, and the chemical formula is Li 1.08 Ni 2 / 5 co 1 / 5 mn 2 / 5 Mg 0.01 o 2 represented by Compound A;

[0023] (2) The Li was measured by acid-base titration 1.08 Ni 2 / 5 co 1 / 5 mn 2 / 5 Mg 0.01 o 2 The residual lithium element content of material is 658ppm, weighs 200g above-mentioned synthetic Li 1.08 Ni 2 / 5 co 1 / 5 mn 2 / 5 Mg 0.01 ...

Embodiment 2

[0026] The lithium secondary battery of the present embodiment is used multi-component composite cathode material, and its chemical formula is Li 1.04 Ni 1 / 2 co 1 / 5 mn 3 / 10 Zr 0.01 o 2 (PO 4 ) 0.0017 , in powder form;

[0027] Its preparation method:

[0028] (1) Weigh Ni 1 / 2 co 1 / 5 mn 3 / 10 (OH) 2 Represented nickel-cobalt-manganese compound (average particle size D50=8.0μm measured by laser particle size analyzer, tap density 1.60g / cm 3, powder particle shape similar to spherical) 280.00g, lithium carbonate 116.89g, zirconia 3.74g, dry mixing, placed in a muffle furnace, and then sintered at 850°C for 20h, cooled and crushed, sieved, and the chemical formula is Li 1.04 Ni 1 / 2 co 1 / 5 mn 3 / 10 Zr 0.01 o 2 represented by Compound A;

[0029] (2) The Li was measured by acid-base titration 1.04 Ni 1 / 2 co 1 / 5 mn 3 / 10 Zr 0.01 o 2 The residual lithium element content of the material is 451ppm, weigh 200g of the above-mentioned synthesized Li 1.04 Ni 1 / 2 co 1...

Embodiment 3

[0032] The lithium secondary battery of the present embodiment is used multi-component composite cathode material, and its chemical formula is Li 1.12 Ni 3 / 5 co 1 / 5 mn 1 / 5 al 0.01 o 2 (PO 4 ) 0.0054 , in powder form.

[0033] Its preparation method:

[0034] (1) Weigh Ni 3 / 5 co 1 / 5 mn 1 / 5 (OH) 2 Represented nickel-cobalt-manganese compound (average particle diameter D50=13.5μm measured by laser particle size analyzer, tap density 2.25g / cm 3 , powder particle shape similar to spherical) 280.00g, lithium carbonate 125.07g and alumina 1.54g, dry mixed, placed in a muffle furnace, then sintered at 750°C for 20h, cooled, crushed, sieved, and the chemical formula is Li 1.12 Ni 3 / 5 co 1 / 5 mn 1 / 5 al 0.01 o 2 represented by Compound A;

[0035] (2) The Li was measured by acid-base titration 1.12 Ni 3 / 5 co 1 / 5 mn 1 / 5 al 0.01 o 2 The residual lithium element content of the material is 1221ppm, weigh 200g of the above-mentioned synthesized Li 1.12 Ni 3 / 5 co 1 / 5 ...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 赵艳敏李旭袁荣忠王志兴
Owner HUNAN SHANSHAN NEW ENERGY CO LTD
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