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Graphite composite material coated with lithium titanium aluminum phosphate, preparation method of graphite composite material and battery negative electrode

A lithium titanium aluminum phosphate and composite material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of low lithium ion transmission rate and achieve good lithium ion transmission performance

Active Publication Date: 2021-03-09
HUNAN SHINZOOM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the embodiment of the present application is to provide a graphite composite material coated with lithium titanium aluminum phosphate and its preparation method, and a negative electrode of a battery, which aims to improve the problem that the lithium ion transmission rate of the existing graphite material is relatively small

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  • Graphite composite material coated with lithium titanium aluminum phosphate, preparation method of graphite composite material and battery negative electrode
  • Graphite composite material coated with lithium titanium aluminum phosphate, preparation method of graphite composite material and battery negative electrode
  • Graphite composite material coated with lithium titanium aluminum phosphate, preparation method of graphite composite material and battery negative electrode

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preparation example Construction

[0036] The present application also provides a preparation method of the graphite composite material coated with lithium titanium aluminum phosphate, including:

[0037] Mix lithium titanium aluminum phosphate, oxidant, organic solvent, polymer and graphite, dry and remove the organic solvent, and then carbonize to obtain the precursor;

[0038] The precursor is mixed with the passivation solution, the precursor is passivated, and then dried to obtain the graphite composite material coated with lithium titanium aluminum phosphate.

[0039] Exemplarily, the polymer is selected from at least one of polyvinylidene fluoride, polyethylene oxide, polyethylene, polystyrene, polyvinyl chloride, polyether, polyester, polyamide and polyurethane.

[0040] The organic solvent can be selected from carbon tetrachloride, N-methylpyrrolidone, tetrahydrofuran and the like. The organic solvent does not react with the polymer, and the organic solvent is volatile during the drying process.

[0...

Embodiment 1

[0057] This embodiment provides a graphite composite material coated with lithium titanium aluminum phosphate and a negative electrode, which are mainly prepared by the following method:

[0058] Dissolve 3g of polyvinylidene fluoride in 800g of carbon tetrachloride, add 60g of lithium titanium aluminum phosphate, 6ml of 50wt% ferric methanol p-toluenesulfonate as an oxidant, and configure a precursor mixture with a concentration of 7.5wt%;

[0059] Take 100g of the precursor mixture, add 200g of artificial graphite, disperse it evenly through a ball mill, and then spray dry it. Then, under an argon inert atmosphere, heat up to 800°C at a rate of 5°C / min for carbonization for 48 hours, and then cool down naturally to At room temperature, pulverize to obtain the precursor material.

[0060] Put 10g of precursor material into 100ml ethanol solution passivation solution with a concentration of 5wt% iodine element, and conduct surface passivation at 60°C for 6h, then wash with dei...

Embodiment 2

[0066] This embodiment provides a graphite composite material coated with lithium titanium aluminum phosphate and a negative electrode. The graphite composite material coated with lithium titanium aluminum phosphate is mainly prepared by the following method:

[0067] After dissolving 1g of polyethylene oxide in 520ml of N-methylpyrrolidone, 50g of lithium titanium aluminum phosphate and 33ml of 30wt% ferric methanol p-toluenesulfonate were added as an oxidant to form a precursor mixture with a concentration of 10wt%.

[0068] Take 100ml of the precursor mixture, add 100g of artificial graphite, disperse evenly through a ball mill, and then spray dry it. Then, under an argon inert atmosphere, heat up to 700°C at a rate of 1°C / min for carbonization for 72 hours, and then cool down naturally to At room temperature, pulverize to obtain the precursor material;

[0069] Put 10g of precursor material into 100ml ethanol solution passivation solution with a concentration of 1wt% iodin...

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Abstract

The invention relates to the field of battery materials and particularly relates to a lithium titanium aluminum phosphate coated graphite composite material, a preparation method thereof and a batterynegative electrode. The lithium titanium aluminum phosphate-coated graphite composite material comprises an inner core and an outer core, wherein the material of the inner core comprises graphite; the inner core is coated with the shell layer, and the material of the shell layer comprises lithium aluminum titanium phosphate and carbon; and the passivation layer is coated outside the shell layer.Graphite is coated with lithium aluminum titanium phosphate and carbon, so conductivity can be improved, the lithium aluminum titanium phosphate has relatively high lithium ion conductivity, the transmission efficiency of lithium ions can be improved, and compared with other materials, the lithium aluminum titanium phosphate has the characteristics of stable structure, strong chemical stability, good cycle performance and the like. The passivation layer has a passivation effect on the lithium aluminum titanium phosphate, reduces the side reaction of the lithium aluminum titanium phosphate, andimproves the storage performance and cycle performance of the lithium aluminum titanium phosphate, thereby improving the lithium ion transmission efficiency, rate capability and safety performance ofthe graphite composite material coated with the lithium aluminum titanium phosphate.

Description

technical field [0001] The present application relates to the field of battery materials, in particular, to a graphite composite material coated with lithium titanium aluminum phosphate, a preparation method thereof, and a battery negative electrode. Background technique [0002] At present, the negative electrode materials used in the market are mainly graphite materials, but they have defects such as low energy density (theoretical specific capacity is 372mAh / g), poor charge and discharge rate performance, and poor safety performance. Graphite mainly coats soft carbon or hard carbon on its surface through solid phase or liquid phase to increase the diffusion rate of lithium ions during charge and discharge, and improve its rate performance, but the soft carbon or hard carbon coating layer can improve the lithium ion diffusion rate. The transfer rate is limited. Contents of the invention [0003] The purpose of the embodiments of the present application is to provide a g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/133H01M10/0525
CPCH01M4/366H01M4/583H01M4/62H01M4/624H01M4/625H01M4/628H01M4/133H01M10/0525Y02E60/10
Inventor 李能
Owner HUNAN SHINZOOM TECH
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