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Hybrid polyanion-type lithium manganese silicate positive electrode material and preparation method thereof

A polyanionic, lithium manganese silicate technology, applied in the field of materials science, can solve problems such as low conductivity and poor cycle stability, and achieve the effects of improving electrochemical performance, improving electronic conductivity and good cycle stability.

Inactive Publication Date: 2016-12-21
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a mixed polyanionic lithium manganese silicate positive electrode material and a preparation method thereof, the mixed polyanionic lithium manganese silicate positive electrode material and its preparation method To solve the Li in the prior art 2 MnSiO 4 The technical problems of poor cycle stability and low electrical conductivity of the material

Method used

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  • Hybrid polyanion-type lithium manganese silicate positive electrode material and preparation method thereof
  • Hybrid polyanion-type lithium manganese silicate positive electrode material and preparation method thereof
  • Hybrid polyanion-type lithium manganese silicate positive electrode material and preparation method thereof

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Embodiment 1

[0037] A mixed polyanionic manganese lithium silicate positive electrode material is carbon-coated boron-doped manganese lithium silicate, wherein the molecular formula of boron-doped manganese lithium silicate is Li 2+x MnB x Si 1-x o 4 / C, where x=0.06.

[0038] The above-mentioned preparation method of a mixed polyanionic manganese lithium silicate positive electrode material specifically comprises the following steps:

[0039] (1) Weigh 2.06mol lithium acetate dihydrate, 1mol manganese acetate tetrahydrate, 0.06mol boric acid and 90g citric acid in a container, add 500ml deionized water and stir to dissolve on a magnetic stirrer until the solid particles are completely dissolved , then add a mixed solution of absolute ethanol (94ml) and tetraethyl orthosilicate (263.2ml) to the solution, stir evenly, vibrate ultrasonically, then seal the mouth of the container, and keep the temperature in a closed reflux system in a water bath at 80°C for 12h to form a white Emulsion s...

Embodiment 1

[0044] A lithium-ion battery positive electrode material, i.e. carbon-coated boron-doped manganese lithium silicate, its molecular formula is Li 2 MnSiO 4 / C;

[0045] The preparation method of above-mentioned a kind of lithium-ion battery cathode material specifically comprises the following steps:

[0046] (1) Weigh 2 mol of lithium acetate dihydrate, 1 mol of manganese acetate tetrahydrate and 90 g of citric acid in a container, add 500 ml of deionized water and stir to dissolve on a magnetic stirrer until the solid particles are completely dissolved, then pour into the solution Add a mixed solution of absolute ethanol (100ml) and tetraethyl orthosilicate (280ml), stir evenly, oscillate ultrasonically, then seal the mouth of the container, keep the temperature in a closed reflux system in a water bath at 80°C for 12 hours to form a white milky sol, and then gradually heat To 80 ~ 82 ℃, the solvent evaporates, and finally slowly becomes a viscous sol;

[0047] C used abov...

Embodiment 2

[0051] A mixed polyanionic manganese lithium silicate positive electrode material is carbon-coated boron-doped manganese lithium silicate, wherein the molecular formula of boron-doped manganese lithium silicate is Li 2+x MnB x Si 1-x o 4 / C, where x=0.03.

[0052] The above-mentioned preparation method of a mixed polyanionic manganese lithium silicate positive electrode material specifically comprises the following steps:

[0053] (1) Weigh 2.03mol of lithium acetate dihydrate, 1mol of manganese acetate tetrahydrate, 0.03mol of boric acid and 90g of citric acid in a container, add 500ml of deionized water and stir to dissolve on a magnetic stirrer until the solid particles are completely dissolved , then add a mixed solution of absolute ethanol (97ml) and tetraethyl orthosilicate (271.6ml) to the solution, stir evenly, vibrate ultrasonically, then seal the mouth of the container, and keep the temperature in a closed reflux system in a water bath at 80°C for 12h to form a wh...

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Abstract

The invention provides a hybrid polyanion-type lithium manganese silicate positive electrode material, and a molecular formula of the hybrid polyanion-type lithium manganese silicate positive electrode material is Li<2+x>MnB<x>Si<1-X>O<4> / C, wherein x=0.03-0.1. The invention further provides a preparation method of the positive electrode material. The method comprises the steps of weighing lithium acetate dihydrate, manganese acetate tetrahydrate, a boric acid and a citric acid in a container; adding deionized water for dissolving, adding a mixed solution of absolute ethyl alcohol and tetraethyl orthosilicate to the solution, stirring evenly and carrying out ultrasonic oscillation; forming white emulsion sol through a thermostatic waterbath in a closed reverse-flow system, heating the white emulsion sol until a solvent is evaporated to become sticky sol; carrying out drying to obtain white crystalline dry gel, grinding the dry gel and then burning; carrying out heat preservation under the condition of a protective gas, and then naturally cooling to a room temperature in a furnace to obtain a precursor; and carrying out grinding to obtain hybrid polyanion-type lithium manganese silicate. Through an electrochemical performance test, the rate capability and the cycling stability of the positive electrode material of a lithium-ion battery are better improved in comparison with those of pure-phase lithium manganese silicate.

Description

technical field [0001] The invention belongs to the field of materials science, and relates to a positive electrode material of a lithium battery, in particular to a mixed polyanionic lithium manganese silicate positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in various portable electronic products (mobile phones, PDAs, notebook computers, etc.), and will have a broad market in hybrid electric vehicles and pure electric vehicles, and have become the most competitive and most promising secondary battery. [0003] The cathode material commonly used in commercial lithium-ion batteries is LiCoO 2 , however LiCoO 2 The price is expensive, and Co is a heavy metal with high toxicity and poor safety, which greatly limits the application of this battery in the fields of electric vehicles and large-scale energy storage. At present, in many lithium-ion battery cathode materials, the orthosilicate materi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 赖春艳吴婷婷刘婧雅李永虎
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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