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Nano material and preparation method thereof, electrode and secondary battery

A technology of nanomaterials and mixed liquids, applied in the direction of non-aqueous electrolyte batteries, negative electrodes, battery electrodes, etc., can solve the problems of low Coulombic efficiency, poor cycle stability, low rate performance, etc., to shorten the transmission path, improve efficiency, improve Effect of specific capacity performance

Active Publication Date: 2020-04-24
SHENZHEN INST OF ADVANCED TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for preparing nanomaterials, which aims to solve the problems of poor cycle stability, low rate performance, and low Coulombic efficiency of existing tin-based negative electrode materials due to serious volume expansion and pulverization during charge and discharge. The problem

Method used

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  • Nano material and preparation method thereof, electrode and secondary battery
  • Nano material and preparation method thereof, electrode and secondary battery
  • Nano material and preparation method thereof, electrode and secondary battery

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preparation example Construction

[0028] A method for preparing nanomaterials, comprising the steps of:

[0029] S01, dissolving the metal precursor, phosphorus source and nitrogen-containing organic matter in a solvent to prepare a mixed solution;

[0030] S02, heating the mixed solution to prepare a precursor;

[0031] S03. Calcining the precursor in an inert gas atmosphere to prepare a nitrogen-doped carbon-coated pyrophosphate material.

[0032] Specifically, in step S01, a metal precursor, a phosphorus source, and a nitrogen-containing organic compound are dissolved in a solvent to prepare a mixed solution. Among them, metal precursors and phosphorus sources are used as synthetic pyrophosphates (such as SnP 2 o 7 ), using nitrogen-containing organics as raw materials for the synthesis of nitrogen-doped carbon-coated materials, dissolving metal precursors, phosphorus sources, and nitrogen-containing organics in solvents to construct subsequent synthesis of nitrogen-doped carbon-coated pyrophosphate The...

Embodiment 1

[0078] This embodiment provides a nitrogen-doped carbon-coated tin pyrophosphate material, and its preparation method specifically includes the following steps:

[0079] (1) 10mmol of SnCl 2 2H 2 O was added to 50ml of deionized water, 2mmol of phytic acid and 8mmol of melamine were added, and vigorously stirred at 55°C for 2h to obtain a mixed solution;

[0080] (2) Transfer the mixed solution to a two-necked flask, add 50ml of absolute ethanol, then heat and reflux at 85°C for 12h, centrifuge to collect the precipitate, wash it several times with ethanol and water, and dry it in a vacuum oven at 70°C 12h, obtain the precursor;

[0081] (3) Under an argon atmosphere, the precursor was reacted at 600 °C for 2 h to obtain the nitrogen-doped carbon-coated tin pyrophosphate material SnP 2 o 7 @N-C.

Embodiment 2

[0083] The difference between this embodiment and embodiment 1 is that in step (3), the precursor is reacted at 700° C. for 2 hours; other parts are basically the same as those of embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a nano material, a preparation method thereof, an electrode and a secondary battery. The preparation method provided by the invention comprises the steps of dissolving a metal precursor, a phosphorus source and a nitrogen-containing organic matter in a solvent to prepare a mixed solution; carrying out heating reaction on the mixed solution to prepare a precursor; and calcining the precursor in an inert gas atmosphere to prepare the nitrogen-doped carbon-coated pyrophosphate material. A nitrogen-containing organic matter is used as a raw material for synthesizing the nitrogen-doped carbon coating material. A carbon source required for synthesis is introduced while a nitrogen source is introduced. Synthesis of the nitrogen-doped carbon-coated pyrophosphate material with a core-shell structure is promoted. The problems of poor cycling stability, low rate capability and low coulombic efficiency caused bysevere volume expansion and pulverization of an existing tin-based negative electrode material in the charging and discharging process are solved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a nanometer material, a preparation method thereof, an electrode and a secondary battery. Background technique [0002] As lithium-ion batteries are widely used in smart phones, electric vehicles and other fields, the demand for lithium is growing rapidly year by year, but the reserves of lithium resources are limited and unevenly distributed, resulting in a gradual increase in costs, making it difficult to meet people's demand for low-cost, low-cost energy storage devices. High capacity needs. Sodium, potassium and lithium are elements of the same main group, with similar physical and chemical properties, abundant element reserves, low cost, and similar working mechanism to lithium-ion batteries, so new secondary ions based on sodium ions, potassium ions, etc. The development of batteries has received extensive attention as a potential new energy storage device to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/05B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5825H01M4/583H01M10/05H01M2004/027Y02E60/10
Inventor 唐永炳木赛男刘齐荣
Owner SHENZHEN INST OF ADVANCED TECH
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