Preparation method of high-temperature-resistant circulating type lithium manganate positive electrode material

A type of lithium manganate and cathode material technology, applied in the field of preparation of cathode materials for lithium-ion batteries, can solve problems such as poor high-temperature performance, large development space, and poor circulation, and achieve good crystallization performance, improve ion conductivity, and improve The effect of specific capacity

Inactive Publication Date: 2019-05-28
新乡市中天新能源科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, lithium manganese oxide batteries will occupy most of the lithium battery bicycle market because of their high cost performance, with huge room for development
[0004] However, lithium manganate also has certain disadvantages, such as poor circulation and poor high-temperature performance. It is necessary to improve the LiMn 2 o 4 performance, doping and coating on the surface are the most effective means

Method used

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  • Preparation method of high-temperature-resistant circulating type lithium manganate positive electrode material
  • Preparation method of high-temperature-resistant circulating type lithium manganate positive electrode material
  • Preparation method of high-temperature-resistant circulating type lithium manganate positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0017] Nano-manganese dioxide and battery-grade lithium carbonate are used as main raw materials, wherein the molar ratio of lithium-manganese ingredients is 0.54, and nano-yttrium oxide and nano-cobalt oxide with a mass of 1.5% of nano-manganese dioxide are added as additives. Mix evenly in a type mixer, then pre-sinter the mixed material at 800°C for 20 hours, add nano-aluminum hydroxide, nano-magnesium hydroxide, nano-zinc oxide and nano-titanium dioxide to coat after sintering treated, then sintered at 700°C for 15 hours, and finally homogenized and sieved to obtain a high-temperature-resistant cycle-type lithium manganate cathode material. Systematic research on the structure, morphology and electrochemical performance of the synthesized lithium manganate cathode material, the results show that the obtained product has smaller primary particles and more uniform secondary particles, higher specific capacity, and this preparation The method can obtain a spinel-type lithium ...

Embodiment 2

[0021] Nano-manganese dioxide and battery-grade lithium carbonate are used as the main raw materials, and the molar ratio of lithium-manganese ingredients is 0.52, and then nano-manganese dioxide with 1% nano-yttrium oxide is added as an additive, and the main raw materials and additives are mixed in an inclined mixer. and then pre-sinter the mixed material at 720°C for 23 hours, add nano-aluminum hydroxide and nano-magnesium hydroxide with 1% of the mass of the sintered product after sintering for coating treatment, and then sinter at 650°C for 17 hours, and finally Homogenizing and sieving to obtain a high-temperature-resistant cycle-type lithium manganate positive electrode material.

Embodiment 3

[0023] Nano-manganese dioxide and battery-grade lithium carbonate are used as the main raw materials, and the molar ratio of lithium-manganese ingredients is 0.60, and then nano-manganese dioxide with 2% nano-cobalt oxide is added as an additive, and the main raw materials and additives are mixed in an inclined mixer. and then pre-sintered the mixed material at 850°C for 18 hours. After sintering, 3% of the mass of the sintered product was added with nano-zinc oxide and nano-titanium dioxide for coating treatment, and then sintered at 750°C for 12 hours, and finally homogenized Sieve to obtain high-temperature-resistant cycle type lithium manganese oxide positive electrode material.

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Abstract

The invention discloses a method for preparing a high-temperature-resistant circulating type lithium manganate positive electrode material. The preparation method comprises the following steps: usingnano manganese dioxide and battery-grade lithium carbonate as main raw materials; then adding one or more of nano yttrium oxide or nano cobalt oxide as an additive; uniformly mixing main raw materialsand additives in an inclined mixer; pre-sintering the uniformly mixed materials at the temperature of 720-850 DEG C for 18-23 hours; and after sintering, adding at least two of nano aluminum hydroxide, nano magnesium hydroxide, nano zinc oxide or nano titanium dioxide for coating treatment, then sintering at 650-750 DEG C for 12-17 hours, and finally homogenizing and sieving to obtain the high-temperature-resistant circulating lithium manganate positive electrode material. The lithium manganate material prepared by the preparation method disclosed by the invention is uniform in particles, normal in particle size distribution and excellent in processing performance, has higher gram specific capacity, can reach 105 mAh/g or above at 25 DEG C and 1 C gram capacity, has ultrahigh gram specific capacity and excellent cycle performance at the same time, and can reach 1000 times or above at 1 C cycle.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials of lithium ion batteries, and in particular relates to a preparation method of a high temperature-resistant cycle type lithium manganate positive electrode material. Background technique [0002] With the rapid development of modern industry, people's demand for energy is also increasing. The amount of traditional energy such as coal, oil, and natural gas that can be exploited is gradually decreasing. It is imminent to find new and renewable green energy, which makes the recyclable Chemical energy has attracted people's attention. [0003] Lithium-ion batteries are undoubtedly the most promising secondary batteries. The development of lithium batteries has gone through two stages: primary batteries with metal lithium as the negative electrode material and secondary batteries with electrode materials embedded in lithium ions. The application range of lithium-ion...

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
CPCY02E60/10
Inventor 丁现亮张学红贺兆书刘琦和明莉杨忠彬
Owner 新乡市中天新能源科技股份有限公司
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