Positive active material and preparation method and application thereof

A positive electrode active material and positive electrode material technology, applied in the field of positive electrode active materials, to achieve the effect of simple operation and simple preparation process

Inactive Publication Date: 2016-12-14
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still room for improvement in the overall performance of composite materials

Method used

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  • Positive active material and preparation method and application thereof
  • Positive active material and preparation method and application thereof
  • Positive active material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Positive electrode active material, made of nickel cobalt lithium aluminate LiNi 0.82 co 0.15 al 0.03 o 2 and lithium nickel cobalt manganese oxide LiNi 0.34 co 0.32 mn 0.34 o 2 Composition, in terms of mass percentage, is 78% of nickel-cobalt lithium aluminate and 22% of nickel-cobalt lithium manganese oxide. The grains of nickel-cobalt-lithium-aluminate are spherical, with a D50 of 13 μm, and the grains of nickel-cobalt-lithium manganate are spherical, with a D50 of 4 μm.

[0032] The preparation steps of the positive electrode active material are as follows: Accurately take nickel-cobalt lithium aluminate and nickel-cobalt lithium manganate according to the mass percentage, mix them, put them into a ball mill jar, and ball mill them at a speed of 100 rpm for 1.5 hours.

[0033] The positive electrode material is composed of the above-mentioned positive electrode active material, carbon black (conductive agent) and polyvinylidene fluoride (binder). In terms of ...

Embodiment 2

[0036] Positive electrode active material, made of nickel cobalt lithium aluminate LiNi 0.82 co 0.15 al 0.03 o 2 and lithium nickel cobalt manganese oxide LiNi 0.34 co 0.32 mn 0.34 o 2 Composition, in terms of mass percentage, is 70% of nickel-cobalt lithium aluminate and 30% of nickel-cobalt lithium manganese oxide. The grains of nickel-cobalt-lithium-aluminate are spherical, and the D50 is 10 μm, and the grains of nickel-cobalt-lithium manganate are spherical, and the D50 is 1 μm.

[0037] The preparation steps of the positive electrode active material are as follows: Accurately take nickel-cobalt lithium aluminate and nickel-cobalt lithium manganate according to the mass percentage, mix them, put them into a ball mill jar, and ball mill them at a speed of 120 rpm for 1 hour to obtain the product.

[0038] The positive electrode material is composed of the above-mentioned positive electrode active material, acetylene black and polyvinylidene fluoride. In terms of mass...

Embodiment 3

[0041] Positive electrode active material, made of nickel cobalt lithium aluminate LiNi 0.82 co 0.15 al 0.03 o 2 and lithium nickel cobalt manganese oxide LiNi 0.34 co 0.32 mn 0.34o 2 Composition, in terms of mass percentage, is 85% nickel-cobalt lithium aluminate and 15% nickel-cobalt lithium manganese oxide. The grains of nickel-cobalt-lithium-aluminate are spherical, with a D50 of 15 μm, and the grains of nickel-cobalt-lithium manganate are spherical, with a D50 of 6 μm.

[0042] The preparation steps of the positive electrode active material are as follows: Accurately take nickel-cobalt lithium aluminate and nickel-cobalt lithium manganate according to the mass percentage, mix them, put them into a ball mill jar, and ball mill them at a speed of 80 rpm for 2 hours to obtain the product.

[0043] The positive electrode material is composed of the above positive electrode active material, carbon black and polyvinylidene fluoride, in terms of mass percentage, the posit...

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Abstract

The invention discloses a positive active material and a preparation method and application thereof, and belongs to the technical field of lithium-ion batteries. The positive active material is prepared from LiNi0.82Co0.15Al0.03O2 and LiNi0.34Co0.32Mn0.34O2 at the ratio in mass percent of (60%-85%):(15%-40%), and D50 of the LiNi0.82Co0.15Al0.03O2 and the LiNi0.34Co0.32Mn0.34O2 is 10-15 microns and 1-6 microns respectively. Due to the presence of a grain size difference, the two active materials can be evenly mixed; on one hand, high discharge specific capacity of nickel-cobalt lithium aluminate is kept; and on the other hand, high safety performance and cycle performance of nickel-cobalt lithium manganate are fully developed. Compared with the lithium-ion battery of individually using a nickel-cobalt lithium aluminate or nickel-cobalt lithium manganate positive electrode material and the positive electrode material in a comparative example, the lithium-ion battery prepared from the positive electrode material disclosed by the invention has higher discharge capacity, excellent high-temperature cycle performance and excellent low-temperature performance and safety performance.

Description

technical field [0001] The invention relates to a positive electrode active material, and also relates to a preparation method and application of the positive electrode active material, belonging to the technical field of lithium ion batteries. Background technique [0002] As the popularity of electric vehicles continues to accelerate, consumers demand longer cruising ranges, thus posing new challenges to the energy density of power batteries. The key to solving the energy density of power batteries lies in the breakthrough of battery material technology. The "Energy Saving and New Energy Automobile Industry Development Plan (2012-2020)" promulgated by the State Council puts forward the goal: by 2015, the energy density of the power battery module will reach 150Wh / Kg (converted into a single battery, its energy density is 170~190Wh / Kg) Kg), and by 2020, the energy density of the power battery module will reach 300Wh / Kg (corresponding to the energy density of a single batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M10/0525
CPCH01M4/364H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李明露于华章李彦龙程超向德波
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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