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Preparation method of trivalent scandium or chromium-doped spinel-type lithium-rich lithium manganate cathode material

A technology of lithium-rich lithium manganate and cathode material, which is applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor discharge performance, cycle performance degradation, and insufficient structural stability, and achieves low raw material cost and reduced cost. Electrochemical polarization, the effect of improving high current discharge performance

Active Publication Date: 2014-02-26
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Although the above methods can improve the electrochemical performance of the samples to varying degrees, however, due to the spinel Li 4 mn 5 o 12 The stability of the structure is not good enough, the discharge performance is poor under low temperature and high current discharge conditions, and the cycle performance will be significantly attenuated at high temperature

Method used

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  • Preparation method of trivalent scandium or chromium-doped spinel-type lithium-rich lithium manganate cathode material
  • Preparation method of trivalent scandium or chromium-doped spinel-type lithium-rich lithium manganate cathode material

Examples

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Effect test

Embodiment 1

[0036] Weigh lithium hydroxide, manganese nitrate and Sc(OH) respectively according to the molar ratio of lithium ion, manganese ion and scandium ion as 0.99 : 1.20 : 0.05 3 .

[0037] The weighed lithium hydroxide, manganese nitrate and Sc(OH) 3 Mix, add 10 times the volume of ethanol of the total volume of the solid, and wet grind and mix for 12 hours with a super energy ball mill to prepare precursor 1. Precursor 1 was vacuum-dried at 180° C. and 100 Pa to prepare Precursor 2 . Precursor 2 was placed in an oxygen-enriched air atmosphere with an oxygen volume content of 63%, sintered at 197°C for 12 hours, then heated from 197°C to 530°C at a heating rate of 5°C / min, and kept at the temperature for sintering for 20 hours to prepare the tip Spar lithium-rich lithium manganese oxide cathode material.

[0038] Compared with other inventive methods, the raw material cost of the present invention is lower, the electrochemical polarization of lithium ion intercalation and extra...

Embodiment 2

[0040] Weigh lithium carbonate, basic manganese carbonate and Cr 2 o 3 .

[0041] Lithium carbonate, basic manganese carbonate and Cr 2 o 3Mix, add deionized water 15 times the volume of the total volume of the solid, and wet mill and mix for 12 hours with a super energy ball mill to prepare precursor 1. Precursor 1 was placed at 130°C and dried with a spray dryer to prepare Precursor 2. Precursor 2 was placed in an oxygen-enriched air atmosphere with an oxygen volume content of 99%, sintered at 290°C for 3 hours, then heated from 290°C to 495°C at a heating rate of 1°C / min, and kept at the temperature for sintering for 19 hours to prepare the tip. Spar lithium-rich lithium manganese oxide cathode material.

[0042] Compared with other inventive methods, the raw material cost of the present invention is lower, the electrochemical polarization of lithium ion intercalation and extraction is reduced, the high-current discharge performance is improved, and a good foundation i...

Embodiment 3

[0044] Lithium acetate, manganese chloride and scandium nitrate were weighed according to the molar ratio of lithium ion, manganese ion and scandium ion being 0.97: 1.05: 0.15, respectively.

[0045] Mix the weighed lithium acetate, manganese chloride and scandium nitrate, add acetone that is 1 times the volume of the total solid volume, and wet grind and mix for 3 hours with an ordinary ball mill to prepare the precursor 1. Precursor 1 was vacuum-dried at 80° C. and 10 Pa pressure to prepare Precursor 2 . Precursor 2 was placed in an oxygen-enriched air atmosphere with an oxygen volume content of 22%, sintered at 150°C for 3 hours, then heated from 150°C to 400°C at a heating rate of 1°C / min, and kept at the temperature for sintering for 3 hours to prepare a tip Spar lithium-rich lithium manganese oxide cathode material.

[0046] Compared with other inventive methods, the raw material cost of the present invention is lower, the electrochemical polarization of lithium ion int...

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Abstract

The invention relates to a preparation method of a trivalent scandium or chromium-doped spinel-type lithium-rich lithium manganate cathode material. The preparation method is characterized in that 1, lithium, manganese, and scandium or chromium compounds are weighed according to a lithium-manganese-doping ion mole ratio of x: y: z, and x is greater than or equal to 0.97 and less than or equal to 1.08, y is greater than or equal to 1.05 and less than or equal to 1.20 and z is greater than or equal to 0.05 and less than or equal to 0.17; 2, the weighed compounds are mixed, a wet grinding medium is added into the mixture so that a predecessor 1 is obtained, and the predecessor 1 is dried to form a predecessor 2; and 3, the trivalent scandium or chromium-doped spinel-type lithium-rich lithium manganate anode material is obtained by a two-stage sintering method. The preparation method has a low raw material cost, reduces electrochemical polarization of lithium ion embedding and removal by doping, improves heavy current discharge performances and lays a good foundation for industrialization.

Description

technical field [0001] The invention belongs to the technical field of battery electrode material preparation, and in particular relates to a preparation method of a lithium-rich spinel lithium manganate positive electrode material that can be used for 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 str...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/38
CPCY02E60/122H01M4/505H01M4/628Y02E60/10
Inventor 童庆松吕超任媛媛郑莹颍陈顺玉粟雪黄能贵李秀华朱德钦
Owner FUJIAN NORMAL UNIV
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