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Lithium orthosilicate composite material and preparation method and application thereof

A technology of lithium orthosilicate and composite materials, applied in the field of energy storage, can solve the problems of low charge and discharge capacity

Active Publication Date: 2021-03-09
SONGSHAN LAKE MATERIALS LAB +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]In recent years, people have done some research on the synthesis of lithium orthosilicate materials, such as the existing lithium nitrate as lithium source and oxidant, orthosilicate Ethyl ester is used as a silicon source, and citric acid is used as a complexing agent and a fuel to prepare a method for lithium orthosilicate porous materials. The obtained material has an average particle size of less than 5um, but contains impurities such as lithium metasilicate and lithium carbonate; now Some disclose a high-temperature solid-phase preparation method of lithium orthosilicate, a negative electrode material for lithium-ion batteries, which mixes carbon sources and silicon sources in a certain proportion, obtains lithium orthosilicate negative electrode materials through pretreatment and sintering reactions, and It is used as the negative electrode material of lithium-ion batteries, and its initial charge and discharge capacities are 108.5mAh / g and 220.2mAh / g respectively, but its charge and discharge capacity in the first week is too low

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  • Lithium orthosilicate composite material and preparation method and application thereof
  • Lithium orthosilicate composite material and preparation method and application thereof
  • Lithium orthosilicate composite material and preparation method and application thereof

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preparation example Construction

[0050] Specifically, the preparation method of lithium orthosilicate composite material comprises the following steps:

[0051] S1. Obtain lithium source, silicon source, doped metal source and organic carbon source, and mix lithium source, silicon source, organic carbon source and doped metal source to prepare a precursor.

[0052] Wherein, the molar ratio of the metal element in the doped metal source and Si in the silicon source is y:(1-y), 04 Si 1-y x y o 4 , 0<y≤0.2, X represents a metal element. At the same time, because a certain amount of Li or Si may be lost during the sintering process, the molar ratio of Li in the lithium source to Si in the silicon source is (3.2-4.4): 1, specifically for example, Li in the lithium source and Si in the silicon source The Si molar ratio is 3.2:1, 3.5:1, 3.8:1, 3.9:1, 4:1, 4.1:1 or 4.4:1, etc.

[0053] Wherein, the organic carbon source is solid, and the organic carbon source here refers to an organic matter composed of carbon sk...

Embodiment 1

[0090]1. Take 800ml of absolute ethanol as a solvent, add 125g of nano silicon dioxide and 307.45g of lithium carbonate to it, stir and mix evenly, put it into a ball mill jar, add 1.25g of titanium dioxide and then add 83.3g of glucose, then carry out stirring ball milling, After ball milling, put the slurry in a blast drying oven and bake at 80°C for 10 hours. After drying, crush and sieve to obtain the precursor. Put the precursor into a tube furnace for sintering, protected by argon, and the sintering condition is 800°C. After sintering for 6 hours, after the tube furnace was naturally cooled, the sample was taken out, crushed and sieved to obtain a titanium-doped carbon-coated lithium orthosilicate material, which was denoted as a1.

[0091] 2. Take 800ml of absolute ethanol as a solvent, add 100g of nano silicon dioxide and 276.96g of lithium carbonate to it, stir and mix evenly, put it into a ball mill jar, add 1.25g of titanium dioxide and then add 83.3g of glucose, the...

Embodiment 2

[0098] 1. Take 600ml of deionized water as a solvent, add 100g of nano silicon dioxide and 248.42g of lithium carbonate into it, mix well and put it into a ball mill jar, add 4.3g of titanium dioxide at the same time, then add 26.7g of polyvinylpyrrolidone, and then stir Ball milling, after ball milling, put the slurry into a blast drying oven and bake at 80°C for 10 hours, after drying, crush and sieve to obtain the precursor of lithium orthosilicate, put the precursor into a tube furnace for sintering, and argon Under gas protection, the sintering condition was 700°C for 4 hours. After the tube furnace cooled naturally, the samples were taken out, crushed and sieved to obtain a titanium-doped carbon-coated lithium orthosilicate material, denoted as b1.

[0099] 2. Take 600ml of deionized water as a solvent, add 100g of nano silicon dioxide and 248.42g of lithium carbonate into it, mix well and put it into a ball mill jar, add 4.3g of niobium oxide, then add 26.7g of polyvinyl...

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Abstract

The invention discloses a lithium orthosilicate composite material and a preparation method and application thereof and belongs to the technical field of energy storage. The lithium orthosilicate composite material comprises metal-doped lithium orthosilicate serving as an inner core and a carbon layer wrapping the inner core, the chemical formula of the metal-doped lithium orthosilicate is Li4Si1-yXyO4, y is larger than 0 and smaller than or equal to 0.2, and X represents metal. When the lithium orthosilicate composite material is applied to a positive electrode material and a lithium batterymaterial, the first-week charge-discharge capacity and the cycle performance of a lithium battery can be obviously improved.

Description

technical field [0001] The present application relates to the field of energy storage technology, in particular, to a lithium orthosilicate composite material and its preparation method and application. Background technique [0002] Due to the advantages of small size, light weight, large specific capacity, long life, and no memory effect, lithium-ion batteries are widely used in portable electronic devices, power storage and electric vehicles. Among them, the positive electrode material of lithium-ion batteries is The key to the replacement of lithium-ion batteries. The current commercial lithium-ion battery cathode material, lithium cobalt oxide, is facing shortage of resources, high price, and unfriendly environment. However, the in-depth research on lithium iron phosphate makes it gradually applied in various fields as the cathode material of lithium-ion batteries. . As a lithium ion conductor material, lithium orthosilicate has high lithium ion transport performance, ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M50/431H01M50/449H01M10/052H01M10/0525C01B32/05C01B33/32
CPCH01M4/366H01M4/5825H01M4/625H01M4/626H01M4/136H01M10/052H01M10/0525C01B33/32C01B32/05C01P2004/80C01P2006/40H01M2004/021H01M2004/028Y02E60/10
Inventor 闫勇黄学杰田孟羽李文超石磊
Owner SONGSHAN LAKE MATERIALS LAB
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