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Positive electrode material for lithium ion secondary battery and preparation method thereof

A technology for secondary batteries and positive electrode materials, which is applied in the fields of positive electrode materials for lithium ion secondary batteries and their preparation, positive electrodes for lithium ion secondary batteries, and lithium ion secondary batteries, can solve the problem of poor rate characteristics, and the cycle performance needs to be improved and increased. Material cost and other issues, to achieve the effect of high purity, excellent rate discharge characteristics and cycle characteristics, and good crystallinity

Active Publication Date: 2016-08-03
新乡市中天新能源科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of its main problems is that the cycle performance needs to be improved, and the other is that its rate characteristics are relatively poor.
Since these coating layers are mostly non-electrochemically active substances, the reversible capacity of the material is reduced, and these surface treatment processes will increase the cost of the material
In addition, it has also been reported that the cycle characteristics of materials can be improved by step-by-step treatment. However, this method belongs to the formation process in battery manufacturing engineering, and the long processing time has a great impact on the shipment and cost of batteries. Unfavorable, and it does not help fundamentally to improve the rate characteristics

Method used

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  • Positive electrode material for lithium ion secondary battery and preparation method thereof
  • Positive electrode material for lithium ion secondary battery and preparation method thereof
  • Positive electrode material for lithium ion secondary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] With Li 1.2 Ni 0.17 co 0.07 mn 0.56 o 2 Weigh lithium hydroxide (excessive 7wt% lithium source), nickel acetate, cobalt acetate and manganese acetate, add deionized water after mixing to form a 0.2mol / L solution, and dry the solution with a spray dryer to obtain The mixture is rapidly pre-calcined at 700° C. in an air atmosphere, then calcined in a muffle furnace at 700° C. for 20 h, ground and dried after cooling.

Embodiment 2

[0043] With Li 1.2 Ni 0.17 co 0.07 mn 0.56 o 2 Weigh lithium hydroxide (excessive 9wt% lithium source), nickel acetate, cobalt acetate and manganese acetate, add deionized water after mixing to form a 0.2mol / L solution, and dry the solution with a spray dryer to obtain The mixture is rapidly pre-calcined at 1000° C. in an air atmosphere, then calcined in a muffle furnace at 1000° C. for 6 hours, ground and dried after cooling.

Embodiment 3

[0045] With Li 1.2 Ni 0.17 co 0.07 mn 0.56 o 2 Weigh lithium hydroxide (10wt% excess lithium source), nickel acetate, cobalt acetate and manganese acetate, add deionized water after mixing to form a 0.2mol / L solution, and dry the solution with a spray dryer to obtain The mixture is rapidly pre-calcined at 800° C. in an air atmosphere, then calcined in a muffle furnace at 800° C. for 12 hours, ground and dried after cooling.

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Abstract

The invention provides a positive pole material of a lithium ion secondary battery. The positive pole material of the lithium ion secondary battery is represented by using a general formula of Li1+xNiyCozMn1-x-y-zO2, wherein x is more than or equal to 0 and is less than or equal to 0.3, y is more than or equal to 0 and is less than or equal to 0.3 and z is more than or equal to 0 and is less than or equal to 0.3. The invention further comprises a preparation method of the positive pole material, a positive pole of the lithium ion secondary battery using the positive pole material, and the lithium ion secondary battery. With the adoption of the preparation method provided by the invention, the lithium enrichment layer-like solid solution positive pole material with ordered surface and internal height of crystalline grains can be obtained only through lithium excess and simple treatment of water treatment; and the lithium enrichment layer-like solid solution positive pole material for the lithium ion secondary battery, which has the characteristics of good crystallization degree, high purity, good rate discharge property and circular property, can be conveniently and rapidly prepared.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium-ion secondary battery cathode material and a preparation method thereof, a lithium-ion secondary battery cathode and a lithium-ion secondary battery. Background technique [0002] Secondary batteries, also known as rechargeable batteries, are batteries that can be activated by charging the active material after the battery is discharged and continue to be used. Compared with dry batteries, secondary batteries can be recharged for thousands to tens of thousands of times, and are a new type of environmentally friendly battery. [0003] The secondary batteries currently on the market mainly include lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries and lithium-ion batteries. Lead-acid batteries are cheap but contain heavy metal lead that pollutes the environment. Nickel-cadmium batteries are more environmentally friendly but have l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M10/0525
CPCY02E60/10
Inventor 李德成刘伟伟方国清孙洪丹夏丙波王海波吴晶晶
Owner 新乡市中天新能源科技股份有限公司