Preparation method of ternary positive electrode material of lithium-rich manganese-based coating layer

A positive electrode material, lithium-rich manganese-based technology, applied in the field of new energy material preparation, can solve the problems of capacity drop, impedance rise, etc., and achieve the effects of improved cycle stability, stable material performance, and excellent electrochemical stability

Pending Publication Date: 2020-01-10
HUBEI WANRUN NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nickel-rich ternary materials are affected by the erosion reaction on the electrode surface, and will react with organic electrolytes at higher operating voltages, resulting in an increase in impedance and a decrease in capacity

Method used

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  • Preparation method of ternary positive electrode material of lithium-rich manganese-based coating layer
  • Preparation method of ternary positive electrode material of lithium-rich manganese-based coating layer

Examples

Experimental program
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Embodiment 1

[0026] NiSO 4 , CoSO 4 , Mn 2 (SO 4 ) 3 According to the ratio of Ni:Co:Mn=7:1.5:1.5, the mixed aqueous solution of nickel, cobalt and manganese was prepared with a concentration of 1.5 mol / L, and the reactor was used for co-precipitation reaction, and an appropriate amount of saturated ammonia and KOH were added to adjust the pH value. Subsequently, the solution and 2M KOH aqueous solution were fed into the reaction kettle separately. During the reaction, keep the pH value at 11, NH 4 OH is added as a chelating agent. Adjust the reaction rate to ensure that the average residence time of the reaction is 4-12 hours. The coprecipitate was filtered, washed and dried at 120°C for 24 hours to obtain Ni 0.7 co 0.15 mn 0.15 (OH) 2 Precursor. Mixed with LiOH at a molar ratio of 1:1.03, preheated at 500°C for 5h, and calcined at 800°C for 15h to obtain LiNi0.7Co0.15Mn0.15O2. The prepared ternary positive electrode material was mixed with lithium nitrate, nickel nitrate, man...

Embodiment 2

[0028] NiSO 4 , CoSO 4 , Mn 2 (SO 4 ) 3 The mixed aqueous solution of nickel, cobalt and manganese was prepared according to the molar ratio Ni: Co: Mn = 8: 1: 1, the concentration was 1 mol / L, and the reactor was used for co-precipitation reaction, and an appropriate amount of saturated ammonia and NaOH were added to adjust the pH value. Subsequently, the solution and 2M NaOH aqueous solution were fed into the reaction kettle separately. During the reaction, keep the pH value at 11, NH 4 OH is added as a chelating agent. Adjust the reaction rate to ensure that the average residence time of the reaction is 4-12 hours. The coprecipitate was filtered, washed and dried at 120°C for 24 hours to obtain Ni 0.7 co 0.15 mn 0.15 (OH) 2 Precursor. Mix with LiOH at a molar ratio of 1:1.03, preheat at 500°C for 5h, and calcinate at 800°C for 15h to obtain LiNi 0.8 co 0.1 mn 0.1 o 2 . The prepared ternary positive electrode material was mixed with lithium nitrate, nickel ni...

Embodiment 3

[0030] NiSO 4, CoSO 4 , Mn 2 (SO 4 ) 3 The mixed aqueous solution of nickel, cobalt and manganese was prepared according to the molar ratio Ni: Co: Mn = 8: 1: 1, the concentration was 1 mol / L, and the reactor was used for co-precipitation reaction, and an appropriate amount of saturated ammonia and NaOH were added to adjust the pH value. Subsequently, the solution and 2M NaOH aqueous solution were fed into the reaction kettle separately. During the reaction, keep the pH value at 11, NH 4 OH is added as a chelating agent. Adjust the reaction rate to ensure that the average residence time of the reaction is 4-12 hours. The coprecipitate was filtered, washed and dried at 120°C for 24 hours to obtain Ni 0.7 co 0.15 mn 0.15 (OH) 2 Precursor. Mixed with LiOH at a molar ratio of 1:1.03, preheated at 450°C for 5h, and calcined at 820°C for 15h to obtain LiNi 0.8 co 0.1 mn 0.1 o 2 . The prepared ternary positive electrode material was mixed with lithium nitrate, nickel ...

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Abstract

The invention discloses a preparation method of a ternary positive electrode material of a lithium-rich manganese-based coating layer. The preparation method comprises the following steps: synthesizing a nickel-rich ternary positive electrode material on the basis of a conventional coprecipitation method, and coating a lithium-rich manganese-based layer on the nickel-rich ternary positive electrode material by a solvothermal method. According to a microscopic core-shell structure, the high-capacity characteristic of the lithium-rich manganese-base layer and the structural stability of the ternary positive electrode material are perfectly combined, so that the material optimal performance is achieved. And finally, the material is coated with an AlF3 coating for protecting the material fromreacting with electrolyte, so that the performance of the material is more stably. The morphology and particle size of the material can be controlled, and the method is simple, controllable and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to a preparation method of a ternary cathode material with a lithium-rich manganese-based coating layer. Background technique [0002] Cathode material is an important part of lithium-ion batteries and a key factor restricting the energy density of batteries. At present, the anode material of lithium-ion batteries that has been industrialized is LiCoO2, which has mature technology and excellent comprehensive performance, but is expensive, highly toxic, and poor in safety performance. Especially when the material is overcharged, it is unstable and reacts with the electrolyte. [0003] LiFePO4 and LiMn2O4 materials emerged as LiCoO2 substitute materials. LiFePO4 has excellent thermal stability and cycle performance, but its actual specific capacity is low (<150 mAh / g), low operating voltage, low electronic conductivity, and poor rate perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62
CPCC01G53/50H01M4/366H01M4/505H01M4/525H01M4/62H01M4/485C01P2004/80C01P2006/40Y02E60/10
Inventor 胡培徐杉史德友刘世琦
Owner HUBEI WANRUN NEW ENERGY TECH DEV
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