A kind of electrochemical preparation method of solid electrolyte lithium lanthanum titanium oxide compound

A solid electrolyte, lithium lanthanum titanium oxide technology, applied in the field of lithium ion batteries, can solve the problems of high energy consumption, high cost, low product purity, etc., achieve the effect of cheap raw materials, simple process, and low product purity

Active Publication Date: 2017-08-25
SHANDONG YUHUANG NEW ENERGY TECH +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, the common methods for synthesizing lithium lanthanum titanium oxide compounds 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 reduced 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

Method used

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  • A kind of electrochemical preparation method of solid electrolyte lithium lanthanum titanium oxide compound
  • A kind of electrochemical preparation method of solid electrolyte lithium lanthanum titanium oxide compound

Examples

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Effect test

Embodiment 1

[0028] Weigh 0.8g of lanthanum oxide, 0.1g of PVDF and 0.1g of acetylene black, grind them in a mortar for half an hour and mix well, take 0.2g of the mixture and put it into a mold, press it under 20MPa pressure 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 15.59mAh. Take out the pressed tablet after lithium intercalation, grind and mix with 0.141g titanium dioxide after drying, pre-fire in a muffle furnace at 800°C for 5 hours, and then sinter at 1000°C for 10 hours after grinding to obtain Li 0.33 La 0.557 TiO 3 , the te...

Embodiment 2

[0030] Weigh 9g of lanthanum oxide, 0.5g of PVDF and 0.5g of Super P, 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 and put it into a mold, and press it under 20MPa pressure for 1 minute Into pieces. 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 the battery tester, and discharge it at a constant current of 0.05C to a capacity of 17.54mAh. Take out the pressed tablet after lithium intercalation, grind and mix with 0.1585g titanium dioxide after drying, pre-fire in a muffle furnace at 550°C for 5 hours, and sinter again at 1200°C for 10 hours after grindin...

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Abstract

The invention belongs to the field of lithium ion batteries, in particular to an electrochemical preparation method of a solid electrolyte lithium lanthanum titanium oxide compound. In the present invention, firstly, lanthanum oxide is intercalated with an appropriate amount of lithium ions by an electrochemical method, and then titanium salt is added according to the ratio of lithium, lanthanum and titanium to form a uniform mixture, and annealed to obtain perovskite-type LLTO. The invention can precisely control the content of lithium by controlling the discharge electric quantity, so as to obtain high-purity lithium lanthanum titanium oxide compound. The invention can accurately control the ratio of lithium lanthanum to titanium, and solves the problem of low product purity due to the volatilization of lithium salt at high temperature in the usual solid-phase method. At the same time, the raw material is cheap and the process is simple. It can be achieved by two steps of electrochemical and high temperature treatment. Obtain high-purity lithium lanthanum titanium oxide compound.

Description

[0001] (1) Technical field [0002] The invention belongs to the field of lithium ion batteries, in particular to an electrochemical preparation method of a solid electrolyte lithium lanthanum titanium oxide compound. [0003] (2) Background technology [0004] 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. [0005] In the solid electrolyte, the perovskite structure compound lithium lanthanum titanium oxide compound Li 3x La 2 / 3-x TiO 3 (LLTO) room temperature ionic conductivity up...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562Y02E60/10
Inventor 张庆朋赵成龙李丽王瑛于文倩王超武陈建伟
Owner SHANDONG YUHUANG NEW ENERGY TECH
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