Preparation method of v2(po4)o/c material, negative electrode and method for making lithium ion battery

A lithium-ion battery and negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as no precedent, and achieve the effects of low production cost, simple and easy-to-control methods, and excellent reversible capacity.

Active Publication Date: 2019-04-26
BEIJING INST OF NANOENERGY & NANOSYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, little is known about V 2 (PO 4 ) The public preparation method of O / C composite material, and there is no precedent for using this material as the negative electrode material of lithium ions

Method used

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  • Preparation method of v2(po4)o/c material, negative electrode and method for making lithium ion battery
  • Preparation method of v2(po4)o/c material, negative electrode and method for making lithium ion battery
  • Preparation method of v2(po4)o/c material, negative electrode and method for making lithium ion battery

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preparation example Construction

[0028] The present invention provides a V 2 (PO 4 ) The preparation method of O / C material, comprises the following steps:

[0029] (1) Dissolve vanadium pentoxide and oxalic acid in deionized water in proportion, and stir for 1 hour under oil bath conditions to form a blue transparent solution. Subsequently, ammonium dihydrogen phosphate and glucose were added in sequence and stirred until the solution was uniform. The temperature of the oil bath is 60°C-100°C, and the molar concentration of vanadium pentoxide is 0.05-0.08mol L -1 . The feed ratio of vanadium pentoxide, oxalic acid, and ammonium dihydrogen phosphate is: V 2 o 5 : H 2 C 2 o 4 2H 2 O: NH 4 h 2 PO 4 =1:3:1. Among them, glucose and ethylene glycol can be distributed in appropriate amounts, generally the amount of glucose is 0.6-2 times the mass of vanadium pentoxide, and the volume fraction of ethylene glycol in the above mixed solution is 3%-6%.

[0030] (2) Put the mixed solution into a 100mL hydr...

no. 1 example

[0041] Place 0.752g of V 2 o 5 (vanadium pentoxide) and 1.512g of H 2 C 2 o 4 (oxalic acid) was dissolved in 70 mL of deionized water and stirred for 60 minutes in an oil bath at 70°C. Subsequently, 0.46 g of NH 4 h 2 PO 4 (ammonium dihydrogen phosphate) and 0.6g of glucose were stirred for 5 minutes after adding the medicine each time to ensure that the medicine was fully dissolved and mixed evenly. Then, 3 mL of ethylene glycol (EG) was added to the reaction system, and further stirred for 10 min. Finally, the solution was transferred into a 100 mL polytetrafluoroethylene-made hydrothermal liner, and sealed in a stainless steel hydrothermal kettle. Under the condition of hydrothermal reaction for 10 hours. The product after hydrothermal reaction was dried at 80°C for 10 hours, then pre-sintered at 350°C for 4 hours, and finally sintered at 750°C for 8 hours to obtain the final product V 2 (PO 4 )O / C.

[0042] The battery casing used for electrochemical testing in ...

no. 2 example

[0046] 0.752g of V2O5 and 1.512g of H 2 C 2 o 4 (oxalic acid) was dissolved in 70 mL of deionized water and stirred for 60 minutes in an oil bath at 100°C. Then sequentially add 0.46 g of NH 4 h 2 PO 4 (ammonium dihydrogen phosphate) and 1g of glucose were stirred for 5 minutes after adding the medicine each time to ensure that the medicine was fully dissolved and mixed evenly. Then, 2 mL of ethylene glycol (EG) was added to the reaction system, and further stirred for 10 min. Finally, the solution was transferred into a 100 mL polytetrafluoroethylene-made hydrothermal liner, and sealed in a stainless steel hydrothermal kettle. Under the condition of hydrothermal reaction for 20 hours. The product after hydrothermal reaction was dried at 80°C for 15 hours, then pre-sintered at 350°C for 4 hours, and finally sintered at 750°C for 8 hours to obtain the final product V 2 (PO 4 )O / C.

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Abstract

The invention relates to a preparation method of V2(PO4)O / C material, a negative electrode of a lithium ion battery, prepared from the V2(PO4)O / C material prepared thereby and a method for preparing the negative electrode. The preparation method comprises the steps of dissolving V2O5 and oxalic acid in deionized water, forming a blue transparent solution in an oil bath condition, and adding ammonium dihydrogen phosphate and glucose into the solution; adding ethylene glycol into the solution to obtain a mixed solution; and performing hydrothermal reaction on the mixed solution to obtain a solid precipitant, wherein the feeding mole ratio of the V2O5, the oxalic acid and the ammonium dihydrogen phosphate is 1:3:1. The invention also provides the negative electrode of a lithium ion battery, prepared from the V2(PO4)O / C material prepared by the method and the method for preparing the negative electrode. The V2(PO4)O / C material, acetylene black and a lithium polyacrylic acid aqueous solution are mixed according to a certain weight proportion and are used for coating a copper foil to prepare an electrode membrane used as the negative electrode of the lithium ion battery. By the technical scheme of the invention, compared with an existing negative electrode material such as lithium titanate and nitride, the V2(PO4)O / C material shows excellent reversible capacity, rate performance and cycle stability when the V2(PO4)O / C material is used as a lithium ion negative electrode material.

Description

technical field [0001] The present invention mainly relates to a preparation method and application of a chemical composite material, in particular to a V 2 (PO 4 ) O / C material preparation method, negative electrode and method for making lithium ion battery. Background technique [0002] As lithium-ion batteries continue to be used in portable electronic devices, electric vehicles, and energy storage power stations, people have higher and higher requirements for the energy, power density, and safety performance of lithium-ion batteries. Although anode materials are not currently the bottleneck for the development of lithium-ion batteries, they also urgently need to be continuously developed to meet the needs of continuous social progress. [0003] Generally, according to the charging and discharging mechanism, lithium-ion battery anode materials are divided into three types: intercalation materials, conversion materials and alloying materials. [0004] Graphite is a typi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/0525H01M4/1393H01M4/1397H01M4/133H01M4/136
CPCH01M4/133H01M4/136H01M4/1393H01M4/1397H01M4/364H01M4/5825H01M4/587H01M10/0525Y02E60/10
Inventor 南喜会曹国忠
Owner BEIJING INST OF NANOENERGY & NANOSYST
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