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Modified lithium iron phosphate composite material, positive electrode material and preparation method thereof

A composite cathode material, lithium iron phosphate technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problem of high decomposition potential of lithium oxalate, and achieve the effect of improving decomposition kinetic performance, electrical conductivity, and capacity.

Active Publication Date: 2022-03-18
安徽洁途新能源科技有限公司
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a modified lithium iron phosphate composite material, positive electrode material and preparation method thereof, so as to solve the technical problem in the prior art that lithium oxalate has a high decomposition potential as a lithium supplement material and needs to add a catalyst or a conductive agent

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  • Modified lithium iron phosphate composite material, positive electrode material and preparation method thereof

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preparation example Construction

[0042] The embodiment of the present invention provides a method for preparing a modified lithium iron phosphate composite material, comprising:

[0043] S101, adding a lithium source, an iron source, a phosphorus source, and a first carbon source into the first solvent for mixing to obtain a first mixture;

[0044] Wherein, the lithium source is selected from one or more of lithium carbonate, lithium hydroxide, lithium acetate, lithium citrate, lithium dihydrogen phosphate; the iron source is selected from iron oxide, ferric oxide, citric acid One or more of iron, ferric phosphate, and ferrous oxalate; the phosphorus source is selected from one or more of ammonium dihydrogen phosphate, diammonium hydrogen phosphate, phosphoric acid, and lithium dihydrogen phosphate.

[0045] Wherein, the first carbon source is selected from one or more of glucose, sucrose, citric acid, polyethylene glycol, polyvinyl butyral, polyvinyl alcohol, polyacrylonitrile, starch, and cellulose.

[004...

Embodiment 1

[0077] A modified lithium iron phosphate composite material provided in this example is prepared according to the following steps: ① mix anhydrous iron phosphate, lithium carbonate and glucose with an appropriate proportion of water according to the mass ratio of 1:0.25:0.14 and stir to disperse evenly ; 2. Grind with a grinder, and control the slurry grinding particle size D50 to be 0.45 μm; 3. Spray dry; 4. Dry the powder at 700 degrees under a nitrogen protective atmosphere for 8 hours to obtain the lithium iron phosphate core; Dissolve completely, then add lithium iron phosphate core and second carbon source and stir to disperse evenly. Among them, the weight ratio of lithium oxalate and lithium iron phosphate samples is 1.0:100, and the addition amount of the second carbon source is to ensure that the carbon content in the coating layer after roasting and the mass ratio of lithium iron phosphate core are at 0.5%-1.0%; Drying and firing under a protective atmosphere at a f...

Embodiment 2

[0081] A modified lithium iron phosphate composite material provided in this example is prepared according to the following steps: ① mix anhydrous iron phosphate, lithium carbonate and glucose with an appropriate proportion of water according to the mass ratio of 1:0.25:0.14 and stir to disperse evenly ; 2. Grind with a grinder, and control the slurry grinding particle size D50 to be 0.45 μm; 3. Spray dry; 4. Dry the powder at 700 degrees under a nitrogen protective atmosphere for 8 hours to obtain the lithium iron phosphate core; Dissolve completely, then add lithium iron phosphate core and second carbon source and stir to disperse evenly. Among them, the weight ratio of lithium oxalate and lithium iron phosphate samples is 4.0:100, and the addition amount of the second carbon source is to ensure that the carbon content in the coating layer after roasting and the mass ratio of lithium iron phosphate core are at 0.5%-1.0%; Drying and firing under a protective atmosphere at a f...

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Abstract

The invention relates to the technical field of cathode materials for lithium ion batteries, in particular to a modified lithium iron phosphate composite material, an anode material and a preparation method thereof. The modified lithium iron phosphate composite material of the present invention includes an inner core and a cladding layer coated on the outer surface of the inner core, the inner core includes carbon and lithium iron phosphate, and the cladding layer includes carbon and lithium oxalate; by the above method , lithium iron phosphate and lithium oxalate form a nano-core-shell structure, and lithium oxalate is coated on the outside of lithium iron phosphate, so that lithium oxalate can be decomposed at a lower potential without adding other catalysts. At the same time, in the core and coating Both layers contain carbon, which improves the decomposition kinetics and electrical conductivity of lithium oxalate, and is conducive to the complete decomposition of lithium oxalate; the modified lithium iron phosphate composite material of the present invention is coated on the positive electrode, which is conducive to improving the capacity of lithium ion batteries .

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium ion batteries, in particular to a modified lithium iron phosphate composite material, an anode material and a preparation method thereof. Background technique [0002] The current lithium-ion battery system is assembled in a discharged state, and the lithium ions come from the positive electrode. For graphite-based negative electrode materials, about 10% of lithium ions will be consumed for the first charge due to the formation of SEI film, resulting in about 10% capacity loss, which greatly limits the improvement of lithium-ion battery capacity. Lithium supplementation technology is to provide an additional part of lithium to offset the lithium consumed by the SEI film, thereby increasing the capacity of the lithium-ion battery. Lithium supplementation technology includes positive electrode lithium supplementation and negative electrode lithium supplementation. Positive lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/58H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 王瑛
Owner 安徽洁途新能源科技有限公司
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