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Composite complexing agent and method of preparing lithium-ion power battery cathode precursor material

A technology of composite complexing agent and power battery, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of high control requirements of experimental conditions, threats to the health of operators, serious waste liquid treatment problems, etc. The effect of easy long-term storage, good surface particle morphology and high industrial value

Active Publication Date: 2018-12-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Enterprises usually use a single ammonia water as a complexing agent, but the ammonia gas it volatilizes is irritating and corrosive to the eyes, nose, and skin, threatening the health of operators, and the disposal of waste liquid is a serious problem
At present, there are very few literatures pointing out the use of a single new complexing agent, but the charge-discharge performance of the positive electrode material prepared by the precursor synthesized by a single complexing agent is average, and a single complexing agent is sensitive to the experimental environment and is not suitable for the experimental environment. Conditional control requirements are high

Method used

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  • Composite complexing agent and method of preparing lithium-ion power battery cathode precursor material
  • Composite complexing agent and method of preparing lithium-ion power battery cathode precursor material
  • Composite complexing agent and method of preparing lithium-ion power battery cathode precursor material

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Experimental program
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Effect test

Embodiment 1

[0034] First prepare NiSO with a concentration of 4.0mol / L 4 ·6H 2 O, CoSO 4 ·7H 2 O, MnSO 4 ·H 2 O mixed solution in which the molar ratio of metal cations satisfies Ni 2+ :Co 2+ :Mn 2+ =6:2:2; prepare composite complexing agent solution (citrate 2.5mol / L, glutamate 0.5mol / L); preparation concentration is the sodium hydroxide solution of 4.0mol / L as precipitation agent; The sodium hydroxide solution is pumped into the reaction kettle, the temperature of the water bath is controlled at 60°C, the pH value is adjusted and controlled to be 11.5, and then the mixed solution of the metal cation solution and the complexing agent is pumped in, and the stirring speed is controlled at 800 rpm. After aging in a reactor at ℃ for 20 hours, deionized washing, and drying at 100℃, a tap density of 1.85g / cm was obtained. 3 of (Ni 0.6 mn 0.2 co 0.2 )(OH) 2 Precursor. Analysis of ICP components in the precursor showed that metal cations (Ni 2+ :Co 2+ :Mn 2+ ) The mol ratio basic...

Embodiment 2

[0044] Prepare NiSO with a concentration of 4.0mol / L 4 ·6H 2 O, CoSO 4 ·7H 2 O, MnSO 4 ·H 2 O mixed solution in which the molar ratio of metal cations satisfies Ni 2+ :Co 2+ :Mn 2+ =6:2:2; prepare composite complexing agent solution (citrate 2.0mol / L, glutamate 1.0mol / L) as buffer complexing agent solution; preparation concentration is the sodium hydroxide solution of 4.0mol / L As a precipitant; first pump sodium hydroxide solution into the reaction kettle, control the temperature of the water bath at 55°C, adjust and control the pH value to 12.0, then pump the mixed solution of metal cation solution and complex complexing agent, and control the stirring speed at 600 rpm After aging for 12 hours in a reactor at a temperature of 55°C, the reactant was deionized and washed to a pH of 7.0 to 7.5, and dried at 100°C to obtain (Ni 0.6 mn 0.2 co 0.2 )(OH) 2 Precursor. The prepared (Ni 0.6 mn 0.2 co 0.2 )(OH) 2 The precursor was mixed with a certain proportion of lithi...

Embodiment 3

[0046] Prepare NiSO with a concentration of 3.0mol / L 4 ·6H 2 O, CoSO 4 ·7H 2 O, MnSO 4 ·H 2 O mixed solution in which the molar ratio of metal cations satisfies Ni 2+ :Co 2+ :Mn 2+ =6:2:2; prepare compound complexing agent solution (citrate 1.0mol / L, glutamate 2.0mol / L) as buffer complexing agent solution; preparation concentration is 3.0mol / L sodium hydroxide solution As a precipitant; first pump sodium hydroxide solution into the reaction kettle, control the temperature of the water bath at 60°C, adjust and control the pH value to 12.0, then pump the mixed solution of metal cation solution and complex complexing agent, and control the stirring speed at 800 rpm / min, after aging for 24 hours in a reactor at a temperature of 50°C, the reactant was deionized and washed to a pH of 7.0 to 7.5, and dried at 100°C to obtain (Ni 0.6 mn 0.2 co 0.2 )(OH) 2 Precursor.

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Abstract

The invention discloses a composite complexing agent and a method of preparing a lithium-ion power battery cathode precursor material, and belongs to the technical field of lithium-ion cathode materials. The two green organic salts, citrates and glutamates (or glycinates), are combined into the novel composite complexing agent to adjust and control pH value and temperature of a reaction system. Settling reaction level herein is more thorough; the reaction process is milder; settling conversion efficiency is high; the low-cost green production of nickel-rich cathode material precursor (Ni0.6Mn0.2Co0.2)(OH)2 is achieved. The precursor prepared herein has uniform particle morphology; both optimization of the co-precipitating technique and precise control of organic salt complexing agent concentration help greatly reduce the environmental pollution due to reaction wastewater and heavy metal ions, true green production is achieved, and high industrial value is provided.

Description

technical field [0001] The invention relates to the technical field of lithium-ion power battery positive electrode materials, and relates to a composite complexing agent and a composite solution containing the complexing agent for preparing lithium-ion power battery positive electrode precursor materials, in particular to a composite complexing agent and preparation of lithium-ion power batteries. A method for anode precursor materials for power batteries. Background technique [0002] Due to the advantages of high energy density, low self-discharge rate, no memory effect, and green environmental protection, nickel-rich lithium batteries have been widely favored in many fields including new energy vehicles, communications, military, and energy. Cathode materials play a crucial role in the electrochemical performance and safety of lithium-ion batteries, and cathode materials are prepared by sintering their corresponding precursors. Complexing agents are one of the important ...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2002/72C01P2004/03C01P2004/32C01P2004/61H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 徐立鹏周飞周浩兵王谦之孔继周
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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