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Method of preparation of ternary anode material precursor

A positive electrode material and precursor technology, applied in the field of chemical energy storage batteries, can solve the problems of many control variables, the difficulty of effectively controlling the growth of primary particle crystal planes, and the failure to achieve synergy.

Active Publication Date: 2017-06-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the many control variables in the preparation of the precursor by co-precipitation, the synergistic effect of each parameter cannot be realized, and it is difficult to effectively control the growth of the primary particle crystal plane.

Method used

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  • Method of preparation of ternary anode material precursor
  • Method of preparation of ternary anode material precursor
  • Method of preparation of ternary anode material precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh NiSO according to the molar ratio Ni:Co:Mn=0.7:0.1:0.2 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O, use deionized water to make the total concentration of Ni, Co, Mn ions is 4mol L -1 mixed salt solution, and then use deionized water to prepare NaOH and ammonia water in a molar ratio of 3:1 to make the NaOH concentration 0.2mol L -1 The mixed alkali solution, in the mixed alkali solution, according to the ratio of NaOH and surfactant mass ratio 9:1, add the surfactant complex system, wherein sodium dodecylbenzenesulfonate (LAS) and thiobetaine 12 ( SB3-12) the molar ratio is 6:5.

[0025] Add 100 mL of deionized water into the reaction kettle as the reaction base solution, and add ammonia water to adjust the pH to about 10.5. The stirring speed was set to 600 r / min, and the reaction temperature was set to 55°C. Pump the mixed salt solution and mixed alkali solution into the reaction kettle slowly and uniformly, keep the pH stable at 10.5, the feeding time ...

Embodiment 2

[0028] Weigh NiSO according to the molar ratio Ni:Co:Mn=0.8:0.1:0.1 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O use deionized water to make the total concentration of Ni, Co, Mn ions is 2mol L -1 mixed salt solution, and then use deionized water to prepare NaOH and ammonia water in a molar ratio of 1:2 so that the NaOH concentration is 0.4mol L -1 Mixed alkali solution, in the mixed alkali solution, according to the ratio of NaOH to surfactant mass ratio of 8:1, add surfactant complex system, wherein sodium dodecylbenzenesulfonate (LAS) and thiobetaine 12 (SB3 -12) in a molar ratio of 1:5.

[0029] Add 100 mL of deionized water into the reaction kettle as the reaction base solution, and add ammonia water to adjust the pH to about 11.0. The stirring speed was set to 600 r / min, and the reaction temperature was set to 55°C. Slowly and uniformly pump the mixed salt solution and mixed alkali solution into the reaction kettle. When the reaction is stable, the pH is stable at...

Embodiment 3

[0032] Weigh NiSO according to the molar ratio Ni:Co:Mn=0.9:0.05:0.05 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O use deionized water to make the total concentration of Ni, Co, Mn ions is 1mol L-1 mixed salt solution, and then use deionized water to prepare NaOH and ammonia water in a molar ratio of 2:5 to make the NaOH concentration 0.4mol L -1 Mix the alkali solution, add the surfactant complex system in the mixed alkali solution according to the ratio of NaOH to the surfactant mass ratio of 10:1, wherein sodium dodecylbenzenesulfonate (LAS) and thiobetaine 12 (SB3 -12) The photo molar ratio is 5:1.

[0033] Add 100mL deionized water into the reaction kettle as the reaction base solution, add ammonia water into the deionized water, and adjust the pH to about 11.5. The stirring speed was set to 650 r / min, and the reaction temperature was set to 55°C. Slowly and uniformly pump the salt mixed solution and alkali solution into the reaction kettle. When the reaction is sta...

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Abstract

The invention relates to a method of preparation of a ternary anode material precursor and belongs to the field of chemical energy storage batteries. The preparation method comprises the steps that a precursor of a nickel-cobalt-manganese ternary material is prepared by adopting a hydroxide coprecipitation method, and primary particle crystal face growth is controlled by utilizing the synergistic effect of a surfactant compounded system and ammonia water. Specifically, sodium dodecyl benzene sulfonate and the sulfo-betaine 12 surfactant compounded system are added in alkali liquor, the synthesis condition of the precursor is adjusted in the preparation process to control a crystal structure of the material, and the nickel-cobalt-manganese ternary anode material precursor different in primary particle morphology is obtained. The nickel-cobalt-manganese ternary material precursor prepared by adopting the method has different primary particle morphology and distribution, has different influences on migration and diffusion of corresponding anode material Li<+>after lithium-mixed calcination and thus shows different electrochemical properties.

Description

technical field [0001] The invention relates to a preparation method of a precursor of a ternary cathode material, in particular to a method for controlling the crystal plane growth of primary particles of the precursor of a nickel-cobalt-manganese ternary cathode material for a lithium ion battery, and belongs to the field of chemical energy storage batteries. Background technique [0002] The rapid development of mobile electronic devices and electric vehicles urgently requires the development of higher-capacity lithium-ion secondary batteries. To meet this demand, it is first necessary to develop a new generation of high-capacity cathode materials. The current market application of the cathode material is mainly LiMn 2 o 4 、LiCoO 2 、LiFePO 4 and nickel-cobalt-manganese ternary cathode material LiNi x co y mn 1-x-y o 2 (0<x<1,0<y<1,0<x+y<1). Nickel-cobalt-manganese ternary materials have the characteristics of high specific capacity, high energy d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525
CPCC01G53/006H01M4/505H01M4/525Y02E60/10
Inventor 刘娜苏岳锋田君包丽颖吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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