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Mixed-phase titanium dioxide modified high-nickel ternary positive electrode material as well as preparation method and application thereof

A titanium dioxide and cathode material technology, which is applied in the field of mixed-phase titanium dioxide modified high-nickel ternary cathode material and its preparation, can solve problems such as poor crystallinity, and achieve the effects of improving rate performance, inhibiting surface side reactions, and inhibiting cation mixing.

Inactive Publication Date: 2020-12-22
ENERGY RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently TiO 2 (referred to as B-type) experimental test results than TiO 2 (referred to as type A) is quite different, which may be TiO 2 (abbreviated as Type B) samples caused by poor crystallinity
Generally, the method of high temperature annealing can improve the TiO 2 (referred to as B-type) crystallinity but often accompanied by TiO 2 (referred to as type A) transformation

Method used

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  • Mixed-phase titanium dioxide modified high-nickel ternary positive electrode material as well as preparation method and application thereof
  • Mixed-phase titanium dioxide modified high-nickel ternary positive electrode material as well as preparation method and application thereof
  • Mixed-phase titanium dioxide modified high-nickel ternary positive electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Dissolve 2ml of isopropyl titanate and n-butyl titanate in hydrochloric acid solution to form an 18% mixed solution, add it to 60ml of ethylene glycol and 30ml of aqueous solution, stir for 15min, and then transfer to polytetrafluoroethylene In a lined reactor, keep warm at 150°C for 5 hours, cool to room temperature, filter with suction and wash and dry repeatedly with ethanol and water to obtain the precursor; heat-treat the precursor at 500°C in nitrogen for 4 hours to obtain a miscible TiO 2 (Type A) / TiO 2 (Type B); the miscible TiO 2 (Type A) / TiO 2 (Type B) and LiNi 0.8 co 0.1 mn 0.1 o 2 Mix at a mass fraction of 3%, ball mill and mix for 30 minutes at a rotational speed of 300r / min, and then heat-treat at 500°C for 10 hours in an oxygen atmosphere to obtain TiO 2 (Type A) / TiO 2 (Type B) LiNi modified by doping and coating 0.8 co 0.1 mn 0.1 o 2 Cathode material.

Embodiment 2

[0054] Dissolve 2ml of isopropyl titanate and n-butyl titanate in hydrochloric acid solution to form an 18% mixed solution, add it to 60ml of ethylene glycol and 30ml of aqueous solution, stir for 15min, and then transfer to polytetrafluoroethylene In a lined reactor, keep warm at 140°C for 5 hours, cool to room temperature, filter with suction and wash and dry repeatedly with ethanol and water to obtain TiO 2 precursor; the TiO 2 The precursor was heat-treated at 460 °C for 4 hours in nitrogen to obtain miscible TiO 2 (Type A) / TiO 2 (Type B); the miscible TiO 2 (Type A) / TiO 2 (Type B) and LiNi 0.8 co 0.1 mn 0.1 o 2 Mix at a mass fraction of 3%, ball mill and mix for 30 minutes at a rotational speed of 300r / min, and then heat-treat at 500°C for 10 hours in an oxygen atmosphere to obtain TiO 2 (Type A) / TiO 2 (Type B) LiNi modified by doping and coating 0.8 co 0.1 mn 0.1 o 2 Cathode material.

Embodiment 3

[0056] Dissolve 2ml of isopropyl titanate and n-butyl titanate in hydrochloric acid solution to form an 18% mixed solution, add it to 60ml of ethylene glycol and 30ml of aqueous solution, stir for 15min, and then transfer to polytetrafluoroethylene In a lined reactor, keep warm at 150°C for 5 hours, cool to room temperature, filter with suction and wash and dry repeatedly with ethanol and water to obtain TiO 2 (Type B) precursor; the TiO 2 (Type B) The precursor was heat-treated at 500 °C for 4 hours in nitrogen to obtain miscible TiO 2 (Type A) / TiO 2 (Type B); the miscible TiO 2 (Type A) / TiO 2 (Type B) and LiNi 0.8 co 0.1 mn 0.1 o 2 Mix according to the mass fraction of 3%, ball mill and mix for 30 minutes at a speed of 300r / min, and then heat-treat at 530°C for 10 hours in an oxygen atmosphere to obtain TiO 2 (Type A) / TiO 2 (Type B) LiNi modified by doping and coating 0.8 co 0.1 mn 0.1 o 2 Cathode material.

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Abstract

The invention belongs to the technical field of electrode materials and new energy power batteries, and relates to a mixed-phase titanium dioxide modified high-nickel ternary positive electrode material as well as a preparation method and application thereof. The high-nickel ternary positive electrode material is composed of a high-nickel ternary positive electrode material and mixed-phase titanium dioxide, the high-nickel ternary positive electrode material is coated and doped with the mixed-phase titanium dioxide, and the mixed-phase titanium dioxide is composed of anatase-phase titanium dioxide and blue copper ore-phase titanium dioxide. The mixed-phase titanium dioxide modified high-nickel ternary positive electrode material has better isolation performance and relatively high capacityretention ratio. The preparation method comprises the following steps: preparing a precursor by a hydrothermal method, carrying out heat treatment to obtain titanium dioxide, mixing the titanium dioxide with a high-nickel ternary positive electrode material, and carrying out heat treatment to obtain the mixed-phase titanium dioxide modified high-nickel ternary positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of electrode materials and new energy power batteries, and in particular relates to a mixed-phase titanium dioxide-modified high-nickel ternary positive electrode material and a preparation method and application thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] High nickel ternary material (LiNi x co y mn 1-x-y o 2 ,x>0.5) has become a research hotspot of cathode materials for power batteries because of its high discharge specific capacity, low cost and environmental friendliness. However, with the increase of nickel content, the increase of alkali content on the surface of the material lea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/42
CPCH01M4/364H01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/4235H01M2004/028Y02E60/10
Inventor 秦显忠楚晨潇蔡飞鹏王波蒋波姜桂林
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI
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