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A kind of preparation method of modified lithium nickel manganese oxide positive electrode material and high-voltage lithium-ion battery

A technology of lithium nickel manganese oxide and positive electrode materials, applied in the direction of batteries, battery electrodes, secondary batteries, etc., can solve the problems of electrode material structure instability, charge and discharge capacity decay, poor cycle performance, etc., achieve fine particle size, reduce heterogeneous, evenly distributed effect

Active Publication Date: 2018-10-09
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0005] However, the high-voltage discharge platform of the electrode material at 4.7V is likely to cause problems such as the decomposition of the electrolyte, resulting in unstable electrode material structure, poor cycle performance, and serious defects in high-temperature, high-rate charge-discharge capacity fading, which have always restricted its continued development. development bottleneck

Method used

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  • A kind of preparation method of modified lithium nickel manganese oxide positive electrode material and high-voltage lithium-ion battery
  • A kind of preparation method of modified lithium nickel manganese oxide positive electrode material and high-voltage lithium-ion battery
  • A kind of preparation method of modified lithium nickel manganese oxide positive electrode material and high-voltage lithium-ion battery

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preparation example Construction

[0048] The invention provides a method for preparing a modified lithium nickel manganese oxide positive electrode material, comprising the following steps:

[0049] A) polycondensing the phenolic compound and the aldehyde compound to obtain a phenolic resin system;

[0050] B) After mixing the phenolic resin system, lithium source, nickel source and manganese source obtained in the above steps, react to obtain a gel precursor;

[0051] C) Grinding the gel precursor obtained in the above steps after drying to obtain gel precursor powder;

[0052] D) After the gel precursor powder obtained in the above steps is sintered and annealed, it is ground again to obtain lithium nickel manganese oxide cathode material powder;

[0053] E) Dispersing and drying the above-mentioned lithium nickel manganese oxide positive electrode material powder and metal salt solution, grinding for the third time, sintering again and grinding for the fourth time to obtain the modified lithium nickel mang...

Embodiment 1

[0087] Completely dissolve resorcinol and formaldehyde in ionized water at a molar ratio of 1:1.8, and keep stirring for 35 minutes to form a phenolic resin solution.

[0088] In the phenolic resin solution that described step obtains, add the Li(Ac), Ni(Ac) that mol ratio is 1.05:0.5:1.5 2 4H 2 O and Mn(Ac) 2 4H 2 O, heated to 75°C in a water bath, and kept stirring until dehydration to form a brown wet gel, which is the gel precursor.

[0089] Then the wet gel was air-dried at 90°C for 12 hours, then transferred to a vacuum drying oven at 90°C for further drying for 12 hours, and the fully dried dry gel was fully ground and refined for 0.5 hours to obtain the gel precursor powder.

[0090] Then put the gel precursor powder in the air atmosphere in the muffle furnace and heat it up to 500°C at 3°C ​​per minute for low-temperature pre-sintering, keep it for 4h to remove the organic matter in the gel, and then cool it with the furnace; grind the cooled precursor for a second...

Embodiment 2

[0096] Completely dissolve resorcinol and formaldehyde in ionized water at a molar ratio of 1:2.0, and keep stirring for 40 minutes to form a phenolic resin solution.

[0097] In the phenolic resin solution that described step obtains, add the Li(Ac), Ni(Ac) that mol ratio is 1.03:0.5:1.5 2 4H 2 O and Mn(Ac) 2 4H 2 O, heated to 70°C in a water bath, and kept stirring until dehydration to form a brown wet gel, which is the gel precursor.

[0098] Then the wet gel was air-dried at 110°C for 10h, then transferred to a vacuum drying oven at 110°C for further drying for 10h, and the fully dried dry gel was fully ground and refined for 0.5h to obtain the gel precursor powder.

[0099] Then put the gel precursor powder in the air atmosphere in the muffle furnace and heat it up to 480°C at 3°C ​​per minute for low-temperature pre-sintering, keep it warm for 5h to remove the organic matter in the gel, and then cool with the furnace; grind the cooled precursor for the second time Re...

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Abstract

The invention provides a preparation method of a modified lithium nickel manganese oxide cathode material. In the preparation method disclosed by the invention, phenolic resin is used as an adjuvant; a spatial structure is provided; a pure-phase LiNi0.5Mn1.5O4 electrode material having nanoscale ultra-fine particle diameter and good crystallization degree and particle diameter distribution is prepared in situ directly in a polymerization system; an electrode material coated by a metallic oxide is prepared through a sol-gel method; therefore, the material has better coating effect; furthermore, a secondary grinding process and a low-temperature long-time annealing process are adopted when the material is sintered; impure phases in the material are reduced easily; and thus, the cycle performance of the battery is improved. According to the preparation method disclosed by the invention, the material is modified through the nanoscale LiNi0.5Mn1.5O4 electrode material and the metal oxide coating process; in combination with the specific sintering and annealing process, the modified lithium nickel manganese oxide cathode material has relatively high cycle performance and stability; and furthermore, the preparation method provided by the invention is moderate in condition, and is applied to large-scale production and application.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a modified lithium nickel manganese oxide positive electrode material and a high-voltage lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, light weight, less white discharge, no memory effect and high cost performance, and have become rechargeable batteries in high-power electric vehicles, artificial satellites, aerospace and other fields. The main selection object of the power supply. Therefore, lithium-ion batteries and related materials have become a research hotspot for researchers. However, as the application range of lithium-ion batteries becomes wider and wider, the requirements for them also increase, especially in order to meet the needs of electric vehicles, hybrid electric vehicles and smart grids, the energy density of lithi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/362H01M4/505H01M4/525H01M10/0525H01M2220/20Y02E60/10
Inventor 夏扣龙施志聪柯曦刘军王诚文刘斌
Owner GUANGDONG UNIV OF TECH
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