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Composite cathode material for lithium ion battery and preparation method thereof

A composite positive electrode material and lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as failure to meet the life requirements of new energy vehicles, poor battery cycle life and high temperature performance, and electrolyte deterioration reactions. Achieve the effects of easy control of manufacturing process, low production cost and tight cladding layer

Active Publication Date: 2012-07-11
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spinel lithium manganese oxide LiMn 2 o 4 Due to its poor high temperature performance, it cannot meet the life requirements of new energy vehicles, and there is still a certain distance in the large-scale application of new energy vehicles.
Lithium iron phosphate LiFePO 4 Due to its advantages of high safety and long cycle life, it is considered to be one of the first choice materials for new energy, but it has a fatal flaw: low energy density. At present, this material cannot meet the energy density requirements of new energy vehicles in the next step. The biggest factor hindering the large-scale application of this material in new energy vehicles
And for the multi-element material Li a Ni x co y mn 1-x-y o 2 In terms of its high energy density and good safety performance, it fully meets the requirements of energy density and safety performance of the new energy vehicle fleet. However, due to the existence of high-valence metal ions, the material is prone to deterioration reactions with the electrolyte, resulting in battery cycle life and Poor high temperature performance

Method used

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  • Composite cathode material for lithium ion battery and preparation method thereof
  • Composite cathode material for lithium ion battery and preparation method thereof
  • Composite cathode material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment one: with synthetic chemical formula LiNi 0.5 co 0.2 mn 0.3 o 2 0.005Al 2 o 3 As an example, the LiNi 0.5 co 0.2 mn 0.3 o 2 Add deionized water 5 times its weight into the reactor, and then prepare aluminum chloride solution with a rate of 0.25mol / L, and 3.5mol / L ammonia solution and 2mol / L NaOH solution; use an electronic metering pump to press 10L / min, 6L / min, 1.25L / min into the reactor, keep the reaction temperature at 80°C, pH value 11.5, react in the reactor at 500r / min for 6h, wash, filter and dry , and then placed in a high-temperature furnace, sintered at 350 ° C for 4 hours, the composite cathode material LiNi 0.5 co 0.2 mn 0.3 o 2 .0.005Al 2 o 3 . Its SEM picture is attached figure 1 , see attached XRD chart figure 2 .

[0022] This material is used as the positive electrode material of the lithium ion battery, acetylene black is used as the conductive agent, and the polytetrafluoroethylene is used as the binder. The weight ratio...

Embodiment 2

[0023] Embodiment two: with synthetic chemical formula LiN i0.5 co 0.2 mn 0.3 o 2 0.01Al 2 o 3 As an example, the LiNi 0.5 co 0.2 mn 0.3 o 2 Add deionized water 6 times its weight into the reactor, and then prepare aluminum chloride solution with a rate of 0.3mol / L, and 3.5mol / L ammonia solution and 2mol / L NaOH solution; use an electronic metering pump to press 10L / min, 6L / min, 1.5L / min flow into the reactor, keep the reaction temperature at 85°C, pH value 11.8, react in the reactor at 550r / min for 6h, wash, filter and dry , and then placed in a high-temperature furnace, sintered at 350 ° C for 4 hours, the composite cathode material LiNi 0.5 co 0.2 mn 0.3 o 2 0.01Al 2 o 3 .

[0024] The 0.2C capacity and 1C cycle life of the composite material were tested by the same method as in Example 1. The first discharge capacity at 0.2C reached 157mAh / g, and the 300-cycle capacity retention rate at 1C rate reached 97.4%.

Embodiment 3

[0025] Embodiment three: with synthetic chemical formula LiNi 0.5 co 0.2 mn 0.3 o 2 .0.01TiO 2 As an example, the LiNi 0.5 co 0.2 mn 0.3 o 2Add deionized water 5 times its weight into the reactor, and then prepare titanium chloride solution with a rate of 0.5mol / L, and 3.5mol / L ammonia solution and 2mol / L NaOH solution; / min, 6L / min, 0.25L / min flow into the reactor, keep the reaction temperature at 90°C, pH value 11.0, react in the reactor at 800r / min for 6h, wash, filter and dry , put it into a high-temperature furnace, and sinter at 450°C for 6 hours to obtain the composite cathode material LiNi 0.5 co 0.2 mn 0.3 o 2 .0.01TiO 2 .

[0026] The 0.2C capacity and 1C cycle life of the composite material were tested by the same method as in Example 1. The first discharge capacity at 0.2C reached 162mAh / g, and the 300-cycle capacity retention rate at 1C rate reached 93.4%.

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Abstract

The invention relates to a composite cathode material for a lithium ion battery and a preparation method of the composite cathode material. The composite cathode material has a chemical formula: Li a Ni x Co y Mn 1-x-y O2 (b)MO, wherein the b / a is greater than or equal to 0.005 but is smaller than or equal to 0.1. The preparation method comprises the steps that: 1, hydroxide is coated on the surface of a multi-element material of Li a Ni x Co y Mn 1-x-y O2 through a wet process; and 2, the composite cathode material of Li a Ni x Co y Mn 1-x-y O2 (b)MO is prepared through high-temperature calcinations, wherein the b / a is greater than or equal to 0.005 but is smaller than or equal to 0.1. The composite cathode material and the preparation process have the advantages that the element distribution of the material is uniform, the surface metal oxide exists, the direct contact of the composite cathode material with electrolyte is avoided, the worsening reaction is reduced, and the cycle service life of the battery is effectively prolonged.

Description

technical field [0001] The invention relates to lithium battery materials, in particular to a composite positive electrode material Li a Ni x co y mn 1-x-y o 2 · (b) MO and its preparation method. Background technique [0002] Lithium-ion secondary batteries have the advantages of high operating voltage, high energy density, long cycle life, and low self-discharge rate, and are considered to be the preferred energy source for new energy vehicles. At present, the positive electrode material of commercialized lithium-ion batteries has lithium cobalt oxide LiCoO 2 , spinel lithium manganese oxide LiMn 2 o 4 , lithium iron phosphate LiFePO 4 and the multi-element material Li a Ni x co y mn 1-x-y o 2 . [0003] Lithium cobaltate LiCoO 2 Due to the lack of cobalt element and the defects in the performance of the material itself, it is impossible to be used in new energy vehicles. Spinel lithium manganese oxide LiMn 2 o 4 Due to its poor high-temperature performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 王明强程迪徐云军尹正中赵甜
Owner HENAN KELONG NEW ENERGY CO LTD
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