Method for preparation of multi-element composite lithium ion battery anode material by secondary sintering

A technology for lithium-ion batteries and composite materials, which is applied in the field of preparing multi-element composite lithium-ion battery cathode materials through secondary sintering, can solve problems such as poor safety and unsuitability, achieve high tap density, reduce battery internal resistance, and improve Effects of cycle performance and safety performance

Inactive Publication Date: 2014-06-04
GUANGRAO GELIN NEW ENERGY
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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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  • Method for preparation of multi-element composite lithium ion battery anode material by secondary sintering
  • Method for preparation of multi-element composite lithium ion battery anode material by secondary sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh a certain amount of nickel sulfate, cobalt sulfate, and manganese sulfate according to the molar ratio of Ni:Co:Mn=1:1:1, and weigh magnesium sulfate according to the molar ratio of Mg:(Ni+Co+Mn)=0.05:1 , add deionized water to make a 1mol / L standard mixed solution.

[0029] Under the protection of an inert atmosphere, add 3 mol / L ammonia solution and 5 mol / L sodium hydroxide solution to the mixed solution, keep the temperature in a water bath at 65°C, control the liquid addition rate to keep the pH value of the system at 12, and react for 2 hours. After filtering, washing and drying, spherical nickel-cobalt-manganese hydroxide doped with magnesium is obtained.

[0030] Li: (Ni+Co+Mn+Mg)=1.05:1 Molar ratio takes lithium carbonate and the spherical nickel-cobalt-manganese hydroxide doped with magnesium, adds in the ball mill, adds the zirconia ball of 3 times of amount simultaneously, Grind well and remove after 3 hours.

[0031] Put the resulting mixture into a ...

Embodiment 2

[0036] Weigh a certain amount of nickel sulfate, cobalt sulfate, manganese sulfate according to the molar ratio of Ni:Co:Mn=5:2:3, and weigh magnesium sulfate according to the molar ratio of Mg:(Ni+Co+Mn)=0.03:1 , add deionized water to make a 1mol / L standard mixed solution.

[0037] Under the protection of an inert atmosphere, add 3 mol / L ammonia solution and 5 mol / L sodium hydroxide solution to the mixed solution, keep the temperature in a water bath at 60°C, control the liquid addition rate to keep the pH value of the system at 11.5, and react for 2 hours. After filtering, washing and drying, spherical nickel-cobalt-manganese hydroxide doped with magnesium is obtained.

[0038] Weigh lithium carbonate and spherical nickel-cobalt-manganese hydroxide doped with magnesium at a molar ratio of Li:(Ni+Co+Mn+Mg)=1.08:1, add in the ball mill, and simultaneously add 3 times the amount of zirconia balls, Grind well and remove after 3 hours.

[0039] Put the resulting mixture into a...

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Abstract

The invention relates to a preparation method of a multi-element composite material mainly used as a lithium ion battery anode material, and also relates to a preparation method for a precursor of the multi-element composite material. The material belongs to nickel-cobalt lithium manganate anode materials, and can be represented by the chemical formula Lia(NixCoyMnz)NbO2/M, wherein a is greater than or equal to 1 and is smaller than or equal to 1.2, b is greater than or equal to 0 and is smaller than or equal to 0.1, (x + y + z) is greater than or equal to 0.9 and is smaller than or equal to 1, N is a doping element and is one or more of Mg, Al, Ti, Cr, Zr, La, Nb and other elements, M is a cladding element and is one or more of Li, B, C, Al, Si, Ti, Co, Zr and other elements. By full mixing of the precursor and a lithium salt, the method provided by the invention improves the reaction activity, and strictly controls the sintering temperature so as to obtain the multi-element anode material with regular shape 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): H01M4/505H01M4/525
CPCY02E60/122H01M4/131H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘国奇郭天顺马强
Owner GUANGRAO GELIN NEW ENERGY
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