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Preparation method of titanium-dioxide-coated spinel lithium-rich lithium manganite positive electrode material

A lithium-rich lithium manganate and titanium dioxide technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve problems such as poor structural stability, poor discharge performance, and high temperature cycle performance degradation, and achieve excellent charging performance. Discharge cycle performance and storage performance, low cost of raw materials, and uniform composition

Inactive Publication Date: 2016-09-07
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Although the above preparation method can improve the electrochemical performance of the sample, the currently prepared spinel Li 4 mn 5 o 12 The stability of the structure is still not good during charge and discharge, and there are problems such as poor discharge performance under low temperature and high current discharge conditions, and obvious attenuation of high temperature cycle performance.

Method used

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  • Preparation method of titanium-dioxide-coated spinel lithium-rich lithium manganite positive electrode material
  • Preparation method of titanium-dioxide-coated spinel lithium-rich lithium manganite positive electrode material
  • Preparation method of titanium-dioxide-coated spinel lithium-rich lithium manganite positive electrode material

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Embodiment 1

[0029] Change the chemical composition to Li 4 mn 5 o 12 The spinel-type lithium-rich lithium manganese oxide powder and butyl titanate are mixed according to the weight ratio of 1:0.050, adding 1 times the volume of deionized water and 20 times the volume of distilled water of the total volume of the solid, and wet grinding with a super energy ball mill After mixing for 10 hours, Precursor 1 was prepared. Precursor 1 was vacuum-dried at 230 °C and 100 Pa to prepare Precursor 2. Precursor 2 was placed in an oxygen-enriched air atmosphere with an oxygen volume content of 62%, sintered at 330°C for 20 hours, and cooled naturally to room temperature to prepare spinel lithium-rich lithium manganate coated with titanium dioxide.

[0030] Compared with other inventive methods, the present invention has lower cost of raw materials, wide sources of raw materials, simple preparation process, uniform composition of prepared electrode materials, excellent charge-discharge cycle perfor...

Embodiment 2

[0032] Change the chemical composition to Li 4.1 mn 5.2 o 12.45The spinel-type lithium-rich lithium manganese oxide powder and titanium tetrachloride are mixed according to the weight ratio of 1:0.12, and 20 times the volume of deionized water of the total volume of the solid is added, and wet-milled and mixed for 15 hours with a wet mill to obtain Precursor 1. Precursor 1 was vacuum-dried at 260 °C and 10132 Pa to prepare Precursor 2. Precursor 2 was placed in an oxygen-enriched air atmosphere with an oxygen volume content of 99%, sintered at 230°C for 24 hours, and cooled naturally to room temperature to prepare spinel lithium-rich lithium manganate coated with titanium dioxide.

[0033] Compared with other inventive methods, the present invention has lower cost of raw materials, wide sources of raw materials, simple preparation process, uniform composition of prepared electrode materials, excellent charge-discharge cycle performance and storage performance, laying a good...

Embodiment 3

[0035] Change the chemical composition to Li 3.9 mn 4.9 o 11.75 The spinel-type lithium-rich lithium manganese oxide powder and titanium dioxide are mixed according to the weight ratio of 1:0.001, and 1 times the volume of deionized water and 1 times the volume of ethanol are added to the total volume of the solid, and wet-milled and mixed with an ordinary ball mill for 3 hours. Precursor 1 was prepared. Precursor 1 was vacuum-dried at 150° C. and a pressure of 10 Pa to prepare Precursor 2 . Precursor 2 was placed in an oxygen-enriched air atmosphere with an oxygen volume content of 22%, sintered at 200°C for 3 hours, and cooled naturally to room temperature to prepare spinel lithium-rich lithium manganate coated with titanium dioxide.

[0036] Compared with other inventive methods, the present invention has lower cost of raw materials, wide sources of raw materials, simple preparation process, uniform composition of prepared electrode materials, excellent charge-discharge ...

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Abstract

The invention relates to a preparation method of a titanium-dioxide-coated spinel lithium-rich lithium manganite positive electrode material. The preparation method is characterized by comprising the following steps: mixing spinel lithium-rich lithium manganite powder with titanium dioxide, titanium monoxide, titanous sulfate, titanium trichloride, titanium tetrachloride or butyl titanate in a weight ratio of 1:(0.001-0.12), and adding a wet grinding medium; mixing the materials by wet grinding to obtain a precursor 1; and performing the steps of drying, sintering and the like to obtain titanium-dioxide-coated spinel lithium-rich lithium manganite. The preparation method is relatively low in raw material cost; the charging-discharging performance of a sample at a high temperature and under a storage condition is improved; and a good basis is laid for industrialization.

Description

technical field [0001] The invention belongs to the technical field of battery electrode material preparation, and in particular relates to a method for preparing spinel lithium-rich lithium manganate used in lithium batteries, lithium ion batteries, polymer batteries and supercapacitors. technical background [0002] Lithium-ion batteries have the advantages of high battery voltage, high energy density, no memory effect, long cycle life, and low self-discharge. The performance of positive electrode materials plays a decisive role in the performance of lithium-ion batteries. [0003] Manganese-based cathode materials have the advantages of low price, green and pollution-free, and are the research focus of lithium-ion batteries. Among the manganese-based cathode materials, spinel LiMn has been studied more. 2 o 4 , layered LiMnO 2 and layered solid solution cathode materials. Among them, layered LiMnO 2 The stability of the structure during charge and discharge is poor, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/485H01M4/36H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M10/0525Y02E60/10
Inventor 童庆松赵南南游帅帅郭可可王蕾彭建明曾观音王彤李秀华
Owner FUJIAN NORMAL UNIV