Electrochemical preparation method of solid electrolyte lithium aluminum titanium phosphate

A technology of lithium titanium aluminum phosphate and solid electrolyte, which is applied in the direction of electrolyte immobilization/gelation, electrochemical generators, circuits, etc., can solve the problems of low product purity, high energy consumption, and high cost, and solve the problem of low product purity Low cost, cheap raw materials, simple process

Active Publication Date: 2016-02-03
SHANDONG YUHUANG NEW ENERGY TECH +1
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  • Abstract
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  • Application Information

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Problems solved by technology

At present, the common methods for synthesizing lithium titanium aluminum phosphate mainly include solid-phase method and sol-gel method. The solid-phase method has a simple process, but long-term high-temperature calcination leads to high energy consumption, and the product purity is low due to the volatilization of lithium salt at high temperature. Low, the sol-gel method uses expensive alkoxide, the cost is very high, only suitable for laboratory research

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  • Electrochemical preparation method of solid electrolyte lithium aluminum titanium phosphate

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 0.719g of titanium dioxide, 0.081g of alumina, 0.1g of PVDF and 0.1g of acetylene black, grind them in a mortar for half an hour and mix them well, take 0.2g of the mixture and put it into a mold, and press it under 20MPa for 1 minute to form a tablet. Use the pressed sheet as the positive electrode, select the CR2032 button battery case, assemble the battery in the order of the negative electrode case, spring sheet, gasket, lithium sheet, diaphragm, positive electrode, and positive electrode case, add 5 drops of lithium-ion battery electrolyte, and seal it with a sealing machine Prepare button cells. Put the prepared button battery on a battery tester, and discharge it at a constant current of 0.05C to a capacity of 36.84mAh. Take out the pressed tablet after lithium intercalation, dry it, grind and mix it with 0.365g ammonium dihydrogen phosphate, pre-calcine in a muffle furnace at 700°C for 10 hours, and then sinter at 900°C for 4 hours to obtain Li 1.3 Al 0....

Embodiment 2

[0025] Weigh 8.09g of titanium dioxide, 0.91g of alumina, 0.5g of PVDF and 0.5g of SuperP, put them into a 100ml ball mill jar with a ball-to-material ratio of 3:1, grind for 2 hours and mix well, take 0.2g of the mixture into a mold, and press it under a pressure of 20MPa 1 minute into a piece. Use the pressed sheet as the positive electrode, select the CR2032 button battery case, assemble the battery in the order of the negative electrode case, spring sheet, gasket, lithium sheet, diaphragm, positive electrode, and positive electrode case, add 5 drops of lithium-ion battery electrolyte, and seal it with a sealing machine Prepare button cells. Put the prepared button battery on a battery tester, and discharge it at a constant current of 0.05C to a capacity of 41.45mAh. Take out the pressed tablet after lithium intercalation, dry it, grind and mix it with 0.41g ammonium dihydrogen phosphate, pre-calcine in a muffle furnace at 550°C for 10 hours, and then sinter at 1100°C for ...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to an electrochemical preparation method of solid electrolyte lithium aluminum titanium phosphate. The electrochemical preparation method comprises the following steps of firstly, preparing a mixture of aluminum oxide and titanium dioxide according to the ratio of aluminum to titanium; secondly, embedding the titanium dioxide into lithium ions through an electrochemical method; thirdly, adding phosphor salts according to the ratio of lithium to aluminum to titanium to phosphorus to form a uniform mixture, and annealing to obtain an LATP solid electrolyte. The electrochemical preparation method disclosed by the invention is low-priced in raw materials and is simple in process; high-purity lithium aluminum titanium phosphate can be obtained by an electrochemical step and a high-temperature treatment step; the ratio of the lithium to the aluminum to the titanium to the phosphorus can be accurately controlled, and the problem that the purity of products is lower caused by volatilization of lithium salts at high temperature in a general solid-phase method is solved.

Description

(1) Technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrochemical preparation method of a solid electrolyte lithium titanium aluminum phosphate. (2) Background technology [0002] The popularity of new energy vehicles can reduce environmental pollution, among which power batteries are the key factor. Power batteries usually use liquid electrolytes, which may cause fire or explosion under abuse, posing safety hazards. All-solid batteries using solid electrolytes do not use flammable liquid electrolytes, and their safety is greatly improved. At the same time, all-solid batteries have more storage capacity and higher output power, but the low ionic conductivity of solid electrolytes hinders all-solid batteries. practical. [0003] In the solid electrolyte, lithium titanium aluminum phosphate Li 1+x Al x Ti 2-x (PO 4 ) 3 (LATP) room temperature ionic conductivity up to 10 -3 S / cm, which is close to the le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/0085Y02E60/10
Inventor 陈建伟赵成龙王龙王瑛张庆朋李丽于文倩王超武
Owner SHANDONG YUHUANG NEW ENERGY TECH
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