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Electrochemical preparation method for LTP (LiTi2(PO4)3)

A lithium titanium phosphate, electrochemical technology, applied in chemical instruments and methods, electrochemical generators, phosphates, etc., can solve the problems of high energy consumption, low product purity, and can not achieve batch commercial production, and achieve raw materials. Inexpensive, simple-to-craft effects

Active Publication Date: 2016-04-06
SHANDONG YUHUANG NEW ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common methods for synthesizing lithium titanium 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. , the sol-gel method uses expensive alkoxides, the cost is very high, it is only suitable for laboratory research, and cannot meet the needs of mass commercial production

Method used

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  • Electrochemical preparation method for LTP (LiTi2(PO4)3)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Weigh 0.8g of titanium dioxide, 0.1g of polyvinylidene fluoride and 0.1g of acetylene black, grind the three in a mortar for half an hour and mix them well, take 0.2g of the mixture into a mold, and press it under 20MPa for 1 minute to form piece.

[0020] (2) Use the pressed sheet as the positive electrode and the lithium sheet as the negative 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, and add 5 drops of lithium ion The battery electrolyte is sealed with a sealing machine to prepare a button battery. According to the mass of titanium dioxide and the ratio of lithium to titanium, the electricity required for lithium intercalation in titanium dioxide is calculated to be 26.8mAh. Put the prepared button battery on the battery tester, and discharge it at a constant current of 0.05C to a capacity of 26....

Embodiment 2

[0023] (1) Weigh 9g of titanium dioxide, 0.5g of PVDF and 0.5g of SuperP, put them into a 100ml ball mill tank, the ratio of ball to material is 3:1, grind for 2 hours and mix well, take 0.2g of the mixture into the mold, and press it under 20MPa for 1 minute to form piece.

[0024] (2) Use the pressed sheet as the positive electrode and the lithium sheet as the negative 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, and add 5 drops of lithium ion The battery electrolyte is sealed with a sealing machine to prepare a button battery. According to the mass of titanium dioxide and the ratio of lithium to titanium, the electricity required for lithium intercalation in titanium dioxide is calculated to be 30.2mAh. Put the prepared button battery on the battery tester, and discharge it at a constant current of 0.05C to a...

Embodiment 3

[0027] (1) Weigh 0.6g of titanium dioxide, 0.2g of polyvinylidene fluoride and 0.2g of acetylene black, grind the three in a mortar for half an hour and mix them well, take 0.2g of the mixture into a mold, and press it under 20MPa for 1 minute to form piece.

[0028] (2) Use the pressed sheet as the positive electrode and the lithium sheet as the negative 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, and add 5 drops of lithium ion The battery electrolyte is sealed with a sealing machine to prepare a button battery. According to the mass of titanium dioxide and the ratio of lithium to titanium, the electricity required for lithium intercalation in titanium dioxide is calculated to be 20.1mAh. Put the prepared button battery on the battery tester and discharge it at a constant current of 0.05C to a capacity of 20.1...

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Abstract

The invention discloses an electrochemical preparation method for LTP (LiTi2(PO4)3). According to the method, firstly, a proper quantity of Li ions are inserted into TiO2 with an electrochemical method, then P salt is added according to proportion of Li, Ti and P, a uniform mixture is formed, and an LTP solid electrolyte is obtained through annealing. The content of Li can be controlled accurately through control of the discharge electric quantity, and high-purity LTP can be obtained accordingly.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to an electrochemical preparation method of lithium titanium phosphate. Background technique [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 phosphate LiTi 2 (PO 4 ) 3 (LTP) room temperature ionic conductivity is as high as 10-3S / cm, which is close to the level of commercial electrolytes, which is particularly i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/26C01B25/45H01M4/58H01M10/0525
CPCC01B25/265C01B25/45H01M4/5825H01M10/0525Y02E60/10
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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