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Lithium ion battery cathode multicomponent material and preparation method thereof

A technology of lithium-ion batteries and composite materials, which is applied in the field of multi-component composite materials and preparations of lithium-ion batteries, can solve the problems of poor safety and unsuitability, achieve high tap density, reduce battery internal resistance, improve cycle performance and The effect of safety performance

Inactive Publication Date: 2015-01-28
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the price is more expensive, and the safety is not as good as other lithium battery cathode materials, so it is not suitable for use in the field of power lithium batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A lithium-ion battery positive electrode multi-element composite material, which belongs to the nickel-cobalt lithium manganese oxide series positive electrode material, can be used with the chemical formula Li a (Ni x co y mn z )N b o 2 / M indicates that a=1.4, b=0.17, (x+y+z)=1.3, N is a doping element, and M is a coating element.

[0033] High-temperature solid-phase synthesis is carried out through multi-element precursors and lithium salts, and the material is modified by means of doping and coating. The doping elements N are Mg, Al, Ti, La and Nb elements, and the coating elements M are Li, B, C, Al, Si and Ti elements.

Embodiment 2

[0035] The method for preparing the lithium-ion battery cathode multiple composite material in Example 1 may further comprise the steps:

[0036] (1) according to the stoichiometric ratio in the chemical formula, take nickel salt, cobalt salt, manganese salt, doping metal salt respectively, and be made into standard mixed solution;

[0037] (2) Under the protection of an inert atmosphere, add an appropriate amount of complexing agent and precipitating agent to the mixed solution, adjust the pH value to reach the end of the reaction, filter, wash, and dry to obtain a spherical multi-component precursor containing doping elements;

[0038] (3) According to the stoichiometric ratio in the chemical formula, the lithium source and the multi-component precursor prepared in step (2) are loaded into a ball mill, and a certain proportion of grinding media is added at the same time, and the dry grinding is performed for 12 hours;

[0039] (4) Put the mixture obtained in step (3) into a ...

Embodiment 3

[0050] The method for preparing the lithium-ion battery cathode multi-element composite material in Example 1 comprises the following steps: (1) according to the stoichiometric ratio in the chemical formula, respectively weigh nickel salt, cobalt salt, manganese salt, and doped metal salt, and prepare into a standard mixed solution;

[0051] (2) Under the protection of an inert atmosphere, add an appropriate amount of complexing agent and precipitating agent to the mixed solution, adjust the pH value to reach the end of the reaction, filter, wash, and dry to obtain a spherical multi-component precursor containing doping elements;

[0052] (3) According to the stoichiometric ratio in the chemical formula, the lithium source and the multi-component precursor prepared in step (2) are loaded into a ball mill, and a certain proportion of grinding media is added at the same time, and the dry grinding is performed for 14 hours;

[0053] (4) Put the mixture obtained in step (3) into a...

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Abstract

The invention relates to a preparation method of a lithium ion battery cathode multicomponent composite material Lia(NixCoyMnz)NbO2 / M, and a preparation method of a precursor of the multicomponent material. The lithium ion battery cathode multicomponent composite material belongs to a nickel cobalt lithium manganate series cathode material, and can be expressed by a chemical formula Lia(NixCoyMnz)NbO2 / M. The preparation method comprises the following steps: measuring to prepare a standard mixed solution; under the protection of an inert atmosphere, adding a proper amount of a complexing agent and a precipitating agent into the mixed solution, adjusting the pH value to reach the end point of the reaction, filtering, washing and drying to obtain a spherical multicomponent precursor containing doped elements; grinding a lithium source and multicomponent precursor obtained in the step (2) in a ball mill; and placing the mixture obtained in the step (3) in a high temperature kiln to obtain a first sintering, so as to obtain the multicomponent material. The invention thorough mixing of precursor and lithium salt improves reaction activity, and strictly controls the temperature in the process of sintering, so as to obtain the multicomponent cathode material with regular morphology and uniform particle size.

Description

technical field [0001] The invention relates to a lithium-ion battery cathode multi-element composite material Li a (Ni x co y mn z )N b o 2 The preparation method of / M also relates to the preparation method of the precursor of the multi-element composite material. Background technique [0002] Since the commercialization of lithium batteries, the performance has been greatly improved, and the application fields have become more and more extensive. It has led the development of lithium battery cathode materials from a single lithium cobalt oxide product to lithium cobalt oxide, multi-component materials, lithium manganate, lithium iron phosphate, etc. A stage where multiple lithium battery cathode materials coexist. [0003] Lithium cobalt oxide is the earliest commercial lithium battery cathode material. It has the advantages of high energy density, high discharge voltage, good fillability and long cycle life, and is widely used in the field of small lithium batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M4/139
CPCH01M4/131H01M4/1391H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 孙琦李岩孙慧英
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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