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Method for preparing spinel lithium-rich lithium manganate coated with boron oxide

A technology of lithium-rich lithium manganese oxide and spinel, which is applied in the field of preparation of spinel lithium-rich lithium manganese oxide, can solve the problems of poor discharge performance, poor structural stability, and attenuation of high-temperature cycle performance, and achieve raw material cost Low, improve the charge and discharge performance, the effect of uniform composition

Inactive Publication Date: 2016-08-31
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for preparing spinel lithium-rich lithium manganate coated with boron oxide
  • Method for preparing spinel lithium-rich lithium manganate coated with boron oxide
  • Method for preparing spinel lithium-rich lithium manganate coated with boron oxide

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Embodiment 1

[0029] Change the chemical composition to Li 4 mn 5 o 12 The spinel lithium-rich lithium manganese oxide powder and the boron trioxide powder with a D50 particle size of 100 nanometers are mixed to prepare a mixture according to a weight ratio of 1:0.03, and distilled water of 18 times the volume of the total solid volume of the mixture is added, and a super energy ball mill is used to prepare the mixture. Precursor 1 was obtained by wet milling and mixing for 9 hours. Precursor 1 was vacuum-dried at 190 °C and 900 Pa to prepare Precursor 2. Precursor 2 was placed in an oxygen-enriched air atmosphere with an oxygen volume content of 50%, sintered at 390°C for 9 hours, and naturally cooled to room temperature to prepare spinel lithium-rich lithium manganate coated with boron oxide.

[0030] Compared with other inventive methods, the preparation process of the present invention is simple, and the prepared samples have excellent charge-discharge cycle performance and storage p...

Embodiment 2

[0032] Change the chemical composition to Li 4.3 mn 5.3 o 12.75The spinel lithium-rich lithium manganese oxide powder and the boron trioxide powder with a D50 particle size of 1 nanometer are mixed according to the weight ratio of 1:0.06 to prepare a mixture, and distilled water 25 times the volume of the total solid volume of the mixture is added, and wet milling Machine wet grinding and mixing for 15 hours to prepare precursor 1. Precursor 1 was vacuum-dried at 80 °C and 10 Pa to prepare Precursor 2. Precursor 2 was placed in an oxygen-enriched air atmosphere with an oxygen volume content of 99%, sintered at 360°C for 24 hours, and cooled naturally to room temperature to prepare spinel lithium-rich lithium manganate coated with boron oxide.

[0033] Compared with other inventive methods, the preparation process of the present invention is simple, and the prepared samples have excellent charge-discharge cycle performance and storage performance, laying a good foundation fo...

Embodiment 3

[0035] Change the chemical composition to Li 3.8 mn 4.8 o 11.5 The spinel lithium-rich lithium manganese oxide powder and the boron trioxide powder with a D50 particle size of 10 nanometers are mixed according to a weight ratio of 1:0.001 to prepare a mixture, and 1 times the volume of the total solid volume of the mixture is added. Precursor 1 was obtained by wet milling and mixing in a common ball mill for 3 hours. Precursor 1 was vacuum-dried at 230 °C and 10132 Pa to prepare Precursor 2. Precursor 2 was placed in an oxygen-enriched air atmosphere with an oxygen volume content of 22%, sintered at 350°C for 3 hours, and cooled naturally to room temperature to prepare spinel lithium-rich lithium manganate coated with boron oxide.

[0036] Compared with other inventive methods, the preparation process of the present invention is simple, and the prepared samples have excellent charge-discharge cycle performance and storage performance, laying a good foundation for industrial...

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Abstract

The invention relates to a method for preparing spinel lithium-rich lithium manganate coated with boron oxide. The method comprises the following steps: mixing spinel lithium-rich lithium manganate with a chemical formula of LixMnyOz with diboron trioxide or boric acid according to a weight ratio of 1:0.001 to 0.01, and preparing a precursor by wet grinding and drying steps; sintering the precursor in a temperature interval of 350-390 DEG C to prepare the spinel lithium-rich lithium manganate coated with the boron oxide. According to the invention, the costs of the raw materials are relatively low, and the prepared electrode material has excellent high current discharge performance at high temperature and storage conditions, thereby laying a good foundation for industrialization.

Description

technical field [0001] The invention belongs to the technical field of battery electrode material preparation, and relates to a method for preparing spinel lithium-rich lithium manganese oxide coated with boron oxide, which can be 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/48H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/366H01M4/483H01M4/505H01M10/0525Y02E60/10
Inventor 童庆松郭可可赵南南游帅帅王蕾彭建明张贵萍王彤李秀华
Owner FUJIAN NORMAL UNIV