Preparation method of aluminum element doped ternary positive electrode material

A technology of positive electrode material and aluminum element, which is applied in the field of energy materials, can solve problems such as poor fluidity, low bulk density, and difficult control of material shape, and achieve the effects of improving performance, improving physical and chemical properties, increasing bulk density and cycle performance

Inactive Publication Date: 2015-09-16
田东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it is difficult to mix the three elements of nickel, cobalt, and manganese evenly, so the synergistic effect of the three elements cannot be fully utilized, and the shape of the prepared material is difficult to control. Usually, the synthesized powder material is composed of random particles. , this material has low bulk density and poor fluidity, which is not conducive to the production of positive electrode materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] NiSO 4 , CoSO 4 , Mn(NO 3 ) 3 , AlCl 3 According to the molar ratio Ni:Co:Mn:Al=12:3:1:4, it is dissolved in a certain amount of deionized water to prepare a mixed salt solution, in which the total concentration of metal ions is 1mol / L, and another 2mol / L NaOH solution and 1mol / L Na 2 S 2 o 8 solution. 500mLNaOH solution and 300mLNa 2 S 2 o 8 The solutions were simultaneously input into 500mL of metal salt mixed aqueous solution for reaction. After the lye and the oxidizing agent solution are completely added, the reaction vessel is sealed, under normal pressure, at 30° C., and the stirring reaction is continued for 5 h to obtain a co-precipitation reaction mixture. The above co-precipitation reaction mixture was subjected to solid-liquid separation, washed 4 times with deionized water, the filtrate was placed in an oven, and vacuum-dried at 100 °C for 12 hours to obtain a dry aluminum-doped ternary cathode material precursor.

[0022] Add LiOH to the dri...

Embodiment 2

[0024] NiSO 4 , CoSO 4 , Mn(NO 3 ) 3 , Al(NO 3 ) 3According to the molar ratio Ni:Co:Mn:Al=12:3:1:4, it is dissolved in a certain amount of deionized water to prepare a mixed salt solution, in which the total concentration of metal ions is 1mol / L, and another 2mol / L NaOH solution and 1mol / L Na 2 S 2 o 8 solution. Mix 500mL NaOH solution and 300mL NaOH with a metering pump at a flow rate of 20mL / min 2 S 2 o 8 The solutions were simultaneously input into 500mL of metal salt mixed aqueous solution for reaction. After the lye and the oxidizing agent solution are completely added, the reaction vessel is sealed, under normal pressure, at 30° C., and the stirring reaction is continued for 5 h to obtain a co-precipitation reaction mixture. The above co-precipitation reaction mixture was subjected to solid-liquid separation, washed 4 times with deionized water, and the filtrate was placed in an oven and vacuum-dried at 100 °C for 12 hours to obtain a dry aluminum-doped ...

Embodiment 3

[0029] NiSO 4 , CoSO 4 , Mn(NO 3 ) 3 , Al(NO 3 ) 3 According to the ratio of Ni:Co:Mn:Al=12:3:1:4, it is dissolved in a certain amount of deionized water to prepare a mixed salt solution, in which the total concentration of metal ions is 1mol / L, and another 1mol / L NaOH solution and 0.5mol / L Na 2 S 2 o 8 solution. Mix 500mL NaOH solution and 300mL NaOH with a metering pump at a flow rate of 20mL / min 2 S 2 o 8 The solutions were simultaneously input into 500mL of metal salt mixed aqueous solution for reaction. After the lye and the oxidizing agent solution are completely added, the reaction vessel is sealed, under normal pressure, at 30° C., and the stirring reaction is continued for 5 h to obtain a co-precipitation reaction mixture. The above co-precipitation reaction mixture was subjected to solid-liquid separation, washed 4 times with deionized water, and the filtrate was placed in an oven and vacuum-dried at 100 °C for 12 hours to obtain a dry aluminum-doped t...

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Abstract

The invention relates to the field of electrode materials, and concretely relates to a preparation method of an aluminum element doped ternary positive electrode material. The technical problem of poor cycle performance of nickel-cobalt-aluminum ternary positive electrode materials in the prior art is solved in the invention. An aluminum doped ternary positive electrode material precursor is prepared through a co-precipitation technology, the physical and chemical performances of the ternary positive electrode material precursor are improved to improve the bulk density and the cycle performance of the nickel-cobalt-aluminum ternary positive electrode materials, and the surface of the ternary positive electrode materials are modified through surface coating to improve the performances of the aluminum doped ternary positive electrode materials.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of an aluminum element-doped ternary positive electrode material, and belongs to the technical field of energy materials. Background technique [0002] Lithium-ion batteries have the advantages of high energy, long life, no memory effect and low pollution, and are widely used in mobile phones, computers, electric bicycles, electric vehicles, national defense and other fields. At present, the positive electrode materials used in lithium-ion batteries mainly include lithium cobalt oxide, lithium iron phosphate, lithium manganese oxide and lithium nickel cobalt manganese oxide. With the development of power batteries used in electric vehicles, due to lithium iron phosphate and lithium manganate The energy density is too low to meet its requirements. Lithium nickel cobalt manganese oxide has the advantages of high ...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M4/62
CPCH01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 田东
Owner 田东
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