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Preparation method of spinel lithium-rich lithium manganese oxide cathode material doped with divalent cations

A technology of lithium-rich lithium manganate and divalent cations, which is applied in manganate/permanganate, battery electrodes, electrical components, etc., and can solve problems such as cycle performance attenuation, poor discharge performance, and weak structural stability , to achieve the effect of reducing polarization, low raw material cost, and improving discharge performance

Active Publication Date: 2015-11-18
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

[0016] Although the above preparation method can improve the electrochemical performance of the sample, however, due to the currently prepared spinel Li 4 mn 5 o 12 The stability of the structure is still not strong 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 cycle performance under high temperature.

Method used

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  • Preparation method of spinel lithium-rich lithium manganese oxide cathode material doped with divalent cations
  • Preparation method of spinel lithium-rich lithium manganese oxide cathode material doped with divalent cations

Examples

Experimental program
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Embodiment 1

[0034] Weigh lithium hydroxide, manganese oxide, and zinc acetate respectively according to the molar ratio of lithium ion, manganese ion, and zinc ion as 1.01:1.15:0.07. Mix the weighed lithium hydroxide, manganese oxide, and zinc acetate, add distilled water 10 times the volume of the total solid volume, and wet-mill and mix with a super ball mill for 10 hours to prepare Precursor 1. The precursor 1 was vacuum-dried at 180°C and 100 Pa to prepare the precursor 2. The precursor 2 was placed in an oxygen-enriched air atmosphere with an oxygen volume content of 61%, sintered at 160 °C for 9 hours, and then heated from 160 °C to 500 °C at a heating rate of 7 °C / min, and the temperature was maintained for 6 hours. Spar lithium-rich lithium manganate cathode material.

[0035] Compared with other inventive methods, the present invention has lower raw material cost, uniform electrode material composition, reduced polarization of zinc-doped samples during charging and discharging, ...

Embodiment 2

[0037] Weigh lithium chloride, manganese hydroxide and zinc nitrate respectively according to the molar ratio of lithium ion, manganese ion and zinc ion as 1.06:1.18:0.07. Mix the weighed lithium chloride, manganese hydroxide and zinc nitrate, add deionized water 12 times the volume of the total solid volume, and wet-mill and mix for 15 hours with a wet mill to prepare precursor 1. Precursor 1 was vacuum-dried at 80°C and 10 Pa to prepare precursor 2. The precursor 2 was placed in an oxygen-enriched air atmosphere with an oxygen volume content of 99%, sintered at 300 °C for 15 hours, and then heated from 300 °C to 600 °C at a heating rate of 30 °C / min, and maintained at the temperature for 24 hours. Spinel lithium-rich lithium manganate cathode material.

[0038] Compared with other inventive methods, the present invention has lower cost of raw materials, reduces the polarization of the prepared zinc-doped sample during charge and discharge, improves the discharge performance...

Embodiment 3

[0040] According to the molar ratio of lithium ion, manganese ion and zinc ion as 0.96:1.07:0.13, respectively weigh lithium hydroxide, manganese oxide and zinc carbonate.

[0041] Mix the weighed lithium hydroxide, manganese oxide, and zinc carbonate, add deionized water with a volume of 1 times the total solid volume, and wet-mill and mix for 3 hours with an ordinary ball mill to prepare precursor 1. Precursor 1 was vacuum-dried at 280° C. and 10132 Pa to prepare precursor 2. The 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 sintered at the temperature for 3 hours to prepare a tip. Spar lithium-rich lithium manganate cathode material.

[0042] Compared with other inventive methods, the raw material cost of the present invention is lower, the polarization of the zinc-doped sample prepared during charging and discharging is r...

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Abstract

The invention relates to a preparation method of a divalent cation-doped spinel lithium-rich lithium manganate cathode material, which is characterized in that the compounds of lithium, manganese and zinc are respectively weighted according to mol ratio of lithium ion to manganese ion to zinc ion with (0.96<=x<=1.06): (1.05<=y<=1.18): (0.02<=z<=0.13), the weighted compound can be mixed, a wet grinding medium is added to obtain a predecessor 1, the predecessor 1 is dried to prepare a predecessor 2, and the predecessor 2 is prepared to a spinel zinc-doped 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 low temperature and discharge performance under the condition of heavy current discharge can be improved, 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 which can be used for lithium batteries, lithium ion batteries, polymer batteries and super capacitors. 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 the cathode material 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 manganese-based cathode materials, spinel LiMn is the most studied. 2 O 4 , Layered LiMnO 2 and layered solid solution cathode materials. Among them, layered LiMnO 2 The stability of the structure durin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505C01G45/12
CPCH01M4/505H01M4/62Y02E60/10
Inventor 童庆松王浪潘国涛姜祥祥李秀华蔡斌黄能贵朱德钦
Owner DYNABAT NEW ENERGY SCI & TECH CO CLD FUJIAN