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Method for preparing tin-doped spinel lithium-rich lithium manganate cathode material by using two-stage sintering process

A technology of lithium-rich lithium manganese oxide and positive electrode materials, which is applied in the direction of manganate/permanganate, battery electrodes, structural parts, etc., can solve the problems of cycle performance attenuation, weak stability, and poor discharge performance, and achieve Improved stability, low raw material cost, and simple preparation process

Active Publication Date: 2014-02-19
DYNABAT NEW ENERGY SCI & TECH CO CLD FUJIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently prepared spinel Li 4 mn 5 o 12 The stability of the structure is not strong during charge and discharge, the discharge performance under low temperature and high current discharge conditions is poor, and the cycle performance will be significantly attenuated during charge and discharge under high temperature, etc.

Method used

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  • Method for preparing tin-doped spinel lithium-rich lithium manganate cathode material by using two-stage sintering process
  • Method for preparing tin-doped spinel lithium-rich lithium manganate cathode material by using two-stage sintering process
  • Method for preparing tin-doped spinel lithium-rich lithium manganate cathode material by using two-stage sintering process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh lithium hydroxide, manganese hydroxide, and tin carbonate respectively according to the molar ratio of lithium ion, manganese ion, and tin ion being 1: 1.12: 0.15.

[0035] Mix the weighed lithium hydroxide, manganese hydroxide, and tin carbonate, add ethanol 10 times the volume of the total solid volume, and use a super energy ball mill for wet grinding and mixing for 11 hours to prepare precursor 1. Precursor 1 was vacuum-dried at 190° C. and 100 Pa to prepare Precursor 2 . Precursor 2 was placed in an oxygen-enriched air atmosphere with an oxygen volume content of 66%, sintered at 230°C for 9 hours, then heated from 230°C to 490°C at a heating rate of 7°C / min, and sintered at the temperature for 18 hours to prepare the tip. Spar lithium-rich lithium manganese oxide cathode material.

[0036] Compared with other inventive methods, the raw material cost of the present invention is lower, and tin doping improves the prepared spinel Li 4 mn 5 o 12 The stability...

Embodiment 2

[0038] Lithium carbonate, basic manganese carbonate and SnO were weighed according to the molar ratio of lithium ion, manganese ion and tin ion being 1.06 : 1.25 : 0.05, respectively.

[0039] Mix the weighed lithium carbonate, basic manganese carbonate and SnO, add acetone 18 times the volume of the total solid volume, and use a super energy ball mill for wet grinding and mixing for 15 hours 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.

[0040] Compared with other inventive methods, the raw material cost of the present invention is lower, and the preparation process is simple, and tin doping impro...

Embodiment 3

[0042]Weigh lithium carbonate, manganese nitrate, and tin hydroxide respectively according to the molar ratio of lithium ion, manganese ion, and tin ion being 1.01: 1.05: 0.21. Mix the weighed lithium carbonate, manganese nitrate, and tin hydroxide, add ethanol 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 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 150°C for 3 hours, and 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.

[0043] Compared with other inventive methods, the raw material cost of the present invention is lower, and tin doping improves the prepared spinel Li 4 mn 5 o 12 The stability of the ...

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Abstract

The invention relates to a method for preparing tin-doped spinel lithium-rich lithium manganate cathode material by using two-stage sintering process, which is characterized in that the compounds of lithium, manganese and tin are respectively weighted according to mol ratio of lithium ion to manganese ion to tin ion with (0.95<=x<=1.06): (1.05<=y<=1.25): (0.05<=z<=0.21), the weighted compound can be mixed, a wet grinding medium is added, a predecessor 2 is prepared through the steps of wet grinding and drying, and the predecessor 2 is prepared to a tin-doped spinel lithium-rich lithium manganate cathode material by using a two-stage sintering process. The cost of raw materials in the present invention is low, the stability of sample structure can be improved by doping tin, discharge capacity is increased, so that good base can be established 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): H01M4/505H01M4/1391C01G45/12
CPCY02E60/122H01M4/505H01M4/628Y02E60/10
Inventor 童庆松任媛媛郑莹颍潘国涛粟雪黄能贵李秀华王浪吕超
Owner DYNABAT NEW ENERGY SCI & TECH CO CLD FUJIAN
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