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Mixed positive electrode material, positive plate using the same, and lithium ion battery

A technology of mixing positive electrode materials and positive electrode sheets, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that the positive electrode material cannot meet the requirements of use, and achieve the effects of excellent cycle stability, good voltage platform, and long cycle life.

Active Publication Date: 2015-01-21
中创新航科技(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a mixed positive electrode material to solve the problem that the existing positive electrode materials cannot meet people's use requirements

Method used

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  • Mixed positive electrode material, positive plate using the same, and lithium ion battery
  • Mixed positive electrode material, positive plate using the same, and lithium ion battery
  • Mixed positive electrode material, positive plate using the same, and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The mixed positive electrode material of this embodiment includes the following components in parts by weight: 90 parts of nickel-cobalt-manganese ternary material, and 10 parts of lithium manganese iron phosphate.

[0046] The nickel-cobalt-manganese ternary material is a-NaFeO 2 Layered crystal structure, belonging to R3m space, chemical formula is LiNi 0.5 co 0.2 mn 0.3 o 2. The nickel-cobalt-manganese ternary material is secondary particles, the D50 of the secondary particles is 9 μm, and the specific surface area is 0.3 m 2 / g. Its scanning electron microscope picture is as figure 1 As shown, the particles are all spherical, which is conducive to uniform mixing.

[0047] The lithium manganese iron phosphate is an orthorhombic olivine crystal structure, and the chemical formula is LiMn 0.7 Fe 0.3 PO 4 . The D50 of the lithium manganese iron phosphate is 7 μm, and the specific surface area is 25 m 2 / g. Its scanning electron microscope picture is as fi...

Embodiment 2

[0059] The mixed positive electrode material of this embodiment includes the following components in parts by weight: 80 parts of nickel-cobalt-manganese ternary material, and 20 parts of lithium manganese iron phosphate.

[0060] The nickel-cobalt-manganese ternary material is a-NaFeO 2 Layered crystal structure, belonging to R3m space, chemical formula is LiNi 0.4 co 0.2 mn 0.4 o 2 . The nickel-cobalt-manganese ternary material is a secondary particle, the D50 of the secondary particle is 8.5 μm, and the specific surface area is 0.32 m 2 / g.

[0061] The lithium manganese iron phosphate is an orthorhombic olivine crystal structure, and the chemical formula is LiMn 0.65 Fe 0.35 PO 4 . The D50 of the lithium manganese iron phosphate is 8 μm, and the specific surface area is 26m 2 / g.

[0062] The positive electrode sheet using the above-mentioned mixed positive electrode material in this embodiment is prepared by the following method:

[0063] 1) Take polyvinyliden...

Embodiment 3

[0073] The mixed positive electrode material of this embodiment includes the following components in parts by weight: 70 parts of nickel-cobalt-manganese ternary material, and 30 parts of lithium manganese iron phosphate.

[0074] The nickel-cobalt-manganese ternary material is a-NaFeO 2 Layered crystal structure, belonging to R3m space, chemical formula is LiNi 0.5 co 0.2 mn 0.3 o 2 . The nickel-cobalt-manganese ternary material is secondary particles, the D50 of the secondary particles is 9 μm, and the specific surface area is 0.3 m 2 / g.

[0075] The lithium manganese iron phosphate is an orthorhombic olivine crystal structure, and the chemical formula is LiMn 0.75 Fe 0.25 PO 4 . The D50 of the lithium manganese iron phosphate is 8 μm, and the specific surface area is 26m 2 / g.

[0076] The positive electrode sheet using the above-mentioned mixed positive electrode material in this embodiment is prepared by the following method:

[0077] 1) Take polyvinylidene f...

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Abstract

The invention discloses a mixed positive electrode material, a positive plate using the same, and a lithium ion battery. The mixed positive electrode material comprises the following component by weight: 50-90 parts of a nickel-cobalt-manganese ternary material and 10-50 parts of lithium-manganese-iron phosphate. The mixed positive electrode material provided by the invention combines the nickel-cobalt-manganese ternary material with high energy density and lithium-manganese-iron phosphate with high safety performance, and plays complementary advantages of nickel-cobalt-manganese and lithium-manganese-iron phosphate, so that comprehensive performances of the positive electrode active material are improved. The positive plate prepared by using the mixed positive electrode material increases the safety performance and cycle performance of the lithium ion battery, increases average voltage of the lithium ion battery, and keeps relatively high energy density; and the lithium ion battery using the positive plate has excellent electrochemical performances, high energy density and high safety performances and long cycle life, and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a mixed positive electrode material, and also relates to a positive electrode sheet using the positive electrode material and a lithium ion battery. Background technique [0002] At present, lithium-ion battery cathode materials mainly include four series: lithium cobaltate, lithium nickelate, lithium manganate and lithium iron phosphate. Among them, lithium cobalt oxide is still the mainstream in the market, but the shortcomings of limited cobalt resources, high price, toxic cobalt and poor safety limit the large-scale application of lithium cobalt oxide in the future. The actual capacity of lithium nickelate is higher than that of lithium cobaltate, and the price of Ni is cheaper than that of cobalt. However, the preparation of lithium nickelate is difficult and its thermal stability is poor. Lithium manganate has the advantages of abundant raw materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/139
CPCC01B25/45H01M4/1397H01M4/364H01M10/0525Y02E60/10
Inventor 袁万颂肖亚洲王赞霞高文超
Owner 中创新航科技(江苏)有限公司
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