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Anion-cation co-doped modified lithium-rich manganese composite positive electrode material and preparation method thereof

A composite cathode material, anion and cation technology, applied in the direction of positive electrode, active material electrode, battery electrode, etc.

Inactive Publication Date: 2020-07-03
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned doping mainly focuses on the single doping of transition metal sites, lithium sites and oxygen sites, but there are few reports on co-doping, especially the co-doping of anions and cations, which can maintain the advantages of cations and anions and achieve Synergies of improved performance

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  • Anion-cation co-doped modified lithium-rich manganese composite positive electrode material and preparation method thereof
  • Anion-cation co-doped modified lithium-rich manganese composite positive electrode material and preparation method thereof
  • Anion-cation co-doped modified lithium-rich manganese composite positive electrode material and preparation method thereof

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preparation example Construction

[0037] The invention provides a method for preparing an anion-cation co-doped modified lithium-rich manganese composite positive electrode material, comprising the following steps:

[0038] The nickel-cobalt-manganese oxide precursor, dopant and lithium source are magnetically stirred and mixed in a solvent, dried and calcined to obtain a lithium-rich manganese composite positive electrode material modified by anion and cation co-doping modification;

[0039] The dopant is a cationic salt and an anionic salt; the cationic salt is selected from one or more of sodium salt, potassium salt, rubidium salt and cesium salt; the anionic salt is selected from fluorine salt, chlorine salt, sulfur One or more of salt and phosphorus salt.

[0040] The present invention mixes nickel-cobalt-manganese oxide precursors, dopants and lithium sources by means of magnetic stirring. This mixing method can not only maintain the morphology of the precursors to the greatest extent, but also obtain th...

Embodiment 1

[0078] The positive electrode material is an initial spherical lithium-rich manganese positive electrode Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 , Na and F monodoped cathode Li 1.15 Na 0.05 Ni 0.13 co 0.13 mn 0.54 o 2 , Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 1.95 f 0.05 , Na and F co-doped positive Li 1.15 Na 0.05 Ni 0.13 co 0.13 mn 0.54 o 1.95 f 0.05 , the specific operation is as follows:

[0079] The molar concentration is the mixed metal ion solution (200ml) of the nickel sulfate of 2M, cobalt sulfate, manganese sulfate (Ni:Co:Mn molar ratio is 0.13:0.13:0.54) and the excessive 5% sodium carbonate of 2M and 0.15M Ammonia solution (200ml) was slowly added dropwise into the reaction kettle with a peristaltic pump respectively, the reaction temperature was controlled at 50°C, pH=7.9, the stirring speed was 800r / min, and the reaction was aged for 20h after the dropwise addition. Then the obtained precipitate was filtered, washed, and dried at 80° C. for 24 hours to...

Embodiment 2

[0086] The modified lithium-rich manganese-based oxide cathode material is a co-doped spherical lithium-rich manganese cathode material obtained by co-doping sodium carbonate and lithium fluoride: Li 1.15 Na 0.05 Ni 0.13 co 0.13 mn 0.54 o 1.95 f 0.05 , the specific operation is as follows:

[0087] The mixed metal ion solution (200ml) that molar concentration is the nickel sulfate of 2M, cobalt sulfate, manganese sulfate (Ni:Co:Mn molar ratio is 0.13:0.13:0.54), the excessive 5% sodium carbonate solution of 2M and 0.15M Aqueous ammonia solution (200ml) was slowly added dropwise into the reaction kettle with a peristaltic pump respectively, the reaction temperature was controlled to be 50°C, pH=7.95, and the stirring speed was 800r / min. The material was filtered, washed, and dried at 80°C for 24 hours to obtain a spherical nickel-cobalt-manganese carbonate precursor.

[0088] Accurately weigh 4.875g of the quasi-spherical nickel-cobalt-manganese carbonate precursor, and ...

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Abstract

The invention provides an anion-cation co-doped modified lithium-rich manganese composite positive electrode material and a preparation method thereof. The method comprises the steps that a nickel-cobalt-manganese oxide precursor, a doping agent and a lithium source are magnetically stirred and mixed in a solvent, dried and calcined, and the anion-cation co-doped modified lithium-rich manganese composite positive electrode material is obtained; the doping agent is a cationic salt and an anionic salt; the cationic salt is selected from one or more of sodium salt, potassium salt, rubidium salt and cesium salt; and the anionic salt is selected from one or more of villiaumite, chlorine salt, sulfur salt and phosphorus salt. By adopting a magnetic stirring mode, the morphology of the precursorcan be kept to the greatest extent; the modified lithium-rich manganese composite positive electrode material with controllable precursor morphology is obtained, the doping agent can be dissolved in the solvent, uniform doping is realized, and the purposes of structure regulation and control and co-doping double modification are achieved, so that the specific discharge capacity, the rate capability and the cycling stability of the composite positive electrode material are improved.

Description

Technical field [0001] The invention belongs to the field of battery technology, and in particular relates to an anion and cation co-doped modified lithium-rich manganese composite positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries play an important role in the development of the new energy industry and are considered the most promising energy storage devices for electronic products, electric vehicles and hybrid vehicles. The energy and power density of existing commercial lithium-ion batteries cannot meet the growing demand due to limitations in the specific capacity of commercial electrode materials. Lithium-rich manganese-based cathode materials due to their high specific capacity (>250mAh g -1 ), high specific energy (>900Wh Kg -1 ) and low cost, it is considered to be one of the most promising cathode materials for next-generation lithium-ion batteries. However, during the first cycle of lithium-ric...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 黄惠张盼盼何亚鹏周建峰董劲郭忠诚
Owner KUNMING UNIV OF SCI & TECH
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