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Preparation method of monovalent ion-doped spinel rich-lithium lithium manganate anode material

A technology of lithium-rich lithium manganese oxide and positive electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of cycle performance attenuation, poor discharge performance, and unstable structure, and achieve low raw material cost, good cycle performance, The effect of the simple preparation process

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] The above preparation method can improve the electrochemical performance of the sample. However, the currently prepared spinel Li 4 mn 5 o 12 The structure is still unstable during charge and discharge, the discharge performance is poor under low temperature and high current discharge conditions, and the cycle performance attenuates significantly at high temperature

Method used

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  • Preparation method of monovalent ion-doped spinel rich-lithium lithium manganate anode material
  • Preparation method of monovalent ion-doped spinel rich-lithium lithium manganate anode material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0036] Weigh lithium hydroxide, manganese acetate and sodium hydroxide respectively according to the molar ratio of lithium ion, manganese ion and sodium ion at 1: 1.15: 0.10. Mix the weighed lithium hydroxide, manganese acetate, and sodium hydroxide, add ethanol 10 times the volume of the total solid volume, and use a super energy ball mill for wet grinding and mixing for 8 hours to prepare precursor 1. Precursor 1 was dried at 160° C. and a pressure of 1000 Pa to prepare Precursor 2 . Precursor 2 was placed in an oxygen-enriched air atmosphere with an oxygen volume content of 52%, sintered at 180°C for 9 hours, then heated from 180°C to 510°C at a heating rate of 5°C / min, and kept at the temperature for sintering for 19 hours to prepare a tip. Spar lithium-rich lithium manganese oxide cathode material.

[0037] Compared with other inventive methods, the present invention has lower cost of raw materials, wide sources of raw materials, simple preparation process, good dischar...

Embodiment 2

[0039] Weigh lithium carbonate, manganese monoxide, and sodium oxide respectively according to the molar ratio of lithium ions, manganese ions, and dopant ions being 0.95: 1.05: 0.15. Mix the weighed lithium carbonate, manganese monoxide, and sodium oxide, add deionized water that is 1 times the volume of the total solid volume, and use a super energy ball mill for wet grinding and mixing for 3 hours to prepare 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 the tip. Spar lithium-rich lithium manganese oxide cathode material.

[0040] Compared with other inventive methods, the invention has lower cost of raw materials, wide sources of raw materials, simple preparation process, ...

Embodiment 3

[0042]Weigh lithium citrate, manganese acetate, and sodium citrate respectively according to the molar ratio of lithium ions, manganese ions, and sodium ions at 1.06: 1.20: 0.02. Mix the weighed lithium citrate, manganese acetate, and sodium citrate, add formaldehyde 15 times the volume of the total solid volume, and wet grind and mix for 15 hours with a wet mill to prepare precursor 1. Precursor 1 was vacuum-dried at 280° 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 300°C for 15 hours, then heated from 300°C to 600°C at a heating rate of 30°C / min, and kept at the temperature for sintering for 24 hours to prepare the tip. Spar lithium-rich lithium manganese oxide cathode material.

[0043] Compared with other inventive methods, the invention has lower cost of raw materials, wide sources of raw materials, simple preparation process, good discharge performance under high cu...

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Abstract

The invention relates to a preparation method of a monovalent ion-doped spinel rich-lithium lithium manganate anode material. The preparation method is characterized in that corresponding compounds are respectively weighed according to the mol ratio of lithium to manganese to doping ions of x: y: z, wherein x is greater than or equal to 0.95 and less than or equal to 1.06, 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 0.02 and less than or equal to 0.15. The compound of the doping ions is the compound of sodium or silver. The weighed compounds are mixed together and added with a wet grinding medium to obtain a precursor 1; the precursor 1 is dried to prepare a precursor 2; the precursor 2 is prepared into the doped spinel rich-lithium lithium manganate anode material by a two-stage sintering method. The preparation method provided by the invention is low in raw material cost; the prepared electrode material is even in composition, and has excellent discharge performance, and further 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 童庆松黄能贵姜祥祥潘国涛李秀华蔡斌王浪陈顺玉
Owner FUJIAN NORMAL UNIV
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