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Negative electrode material of stannous phosphate battery as well as preparation method and application of negative electrode material

A technology of stannous phosphate and battery negative electrode, which is applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of material crushing and large volume change, and achieve the effects of alleviating pulverization, improving cycle life, and low cost

Active Publication Date: 2022-04-05
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the reported electrode materials face the problem of excessive volume change and material crushing during cycling. For example, when Sn4P3 is used as the negative electrode material of lithium-ion batteries, sodium-ion batteries, and potassium-ion batteries, the expansion ratio can be as high as 350%, respectively. %, 524%, 440%

Method used

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  • Negative electrode material of stannous phosphate battery as well as preparation method and application of negative electrode material
  • Negative electrode material of stannous phosphate battery as well as preparation method and application of negative electrode material
  • Negative electrode material of stannous phosphate battery as well as preparation method and application of negative electrode material

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Embodiment 1

[0032] The invention provides a kind of preparation method of stannous phosphate battery negative electrode material, comprises the following steps:

[0033] Step 1, weigh 1 mmol of stannous oxalate and 1 mmol of p-xylylene diphosphonic acid into a beaker, add 30 mL of deionized water, and fully stir by magnetic stirring to obtain a milky white suspension;

[0034] Step 2, transfer the mixed solution obtained in step 1 to a polytetrafluoroethylene-lined autoclave, heat at 160°C for 48 hours, cool to room temperature, centrifuge, wash, and then in 80°C Dry at high temperature for 10h to obtain a tin-containing phosphonic acid MOF precursor;

[0035] Step 3, put the tin-containing phosphonic acid MOF precursor obtained in step 2 in a tube furnace in a porcelain boat, and feed argon into the tube furnace at a flow rate of 30mL / min. In an argon atmosphere, In the tube furnace, the temperature was raised to 630°C at a constant rate of 20°C / min, then kept for 2 hours, and finally c...

Embodiment 2

[0043] The invention provides a kind of preparation method of stannous phosphate battery negative electrode material, comprises the following steps:

[0044] Step 1: Weigh 1 mmol of stannous chloride and 1 mmol of p-xylylene diphosphonic acid into a beaker, add 30 mL of deionized water, and fully stir by magnetic stirring to obtain a milky white suspension;

[0045] Step 2, transfer the mixed solution obtained in step 1 to a polytetrafluoroethylene-lined autoclave, heat at 160°C for 100h, cool to room temperature, centrifuge, wash, and then in an 80°C Dry at high temperature for 10h to obtain a tin-containing phosphonic acid MOF precursor;

[0046] Step 3, put the tin-containing phosphonic acid MOF precursor obtained in step 2 into a tube furnace in a porcelain boat, and feed nitrogen into the tube furnace at a flow rate of 30mL / min. In an argon atmosphere, the tube furnace In the type furnace, the temperature was raised to 630°C at a constant rate of 20°C / min, and then kept ...

Embodiment 3

[0049] The invention provides a kind of preparation method of stannous phosphate battery negative electrode material, comprises the following steps:

[0050] Step 1, weigh 1 mmol of tin oxalate and 2 mmol of p-xylylene diphosphonic acid into a beaker, add 30 mL of deionized water, and fully stir by magnetic stirring to obtain a milky white suspension;

[0051] Step 2, transfer the mixed solution obtained in step 1 to a polytetrafluoroethylene-lined autoclave, heat at 160°C for 24 hours, cool to room temperature, centrifuge, wash, and then in an 80°C Dry at high temperature for 10h to obtain a tin-containing phosphonic acid MOF precursor;

[0052] Step 3, put the tin-containing phosphonic acid MOF precursor obtained in step 2 in a tube furnace in a porcelain boat, and feed argon into the tube furnace at a flow rate of 30mL / min. In an argon atmosphere, In the tube furnace, the temperature was raised to 550°C at a constant rate of 10°C / min, then kept for 3 hours, and finally coo...

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Abstract

The invention relates to the technical field of new energy materials, in particular to a stannous phosphate battery negative electrode material and a preparation method and application thereof. The invention provides a preparation method of a stannous phosphate battery negative electrode material, which specifically comprises the following steps: obtaining a tin-containing phosphonic acid metal organic framework (MOF) through a one-step hydrothermal method or a solvothermal method, namely taking the tin-containing phosphonic acid MOF material as a single precursor; then a composite negative electrode material with Sn3 (PO4) 2 uniformly dispersed in a phosphorus-doped carbon skeleton, namely the Sn3 (PO4) 2-atPC negative electrode material, is finally prepared through one-step calcination heat treatment, and the negative electrode material is uniform and controllable in morphology and well inherits the microstructure of the precursor; anions in Sn3 (PO4) 2 can be used as a matrix for buffering volume change to prevent pulverization of the electrode material, so that the cycle life is prolonged; after calcination, the carbon skeleton has good conductivity, and the cycling stability of the Sn3 (PO4) 2-atPC negative electrode material is enhanced; and meanwhile, when the material is applied to a sodium ion battery or a potassium ion battery, the material has relatively high charge-discharge specific capacity and good cycle stability.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a negative electrode material for a stannous phosphate battery and a preparation method and application thereof. Background technique [0002] With the continuous expansion of the application scale of lithium-ion batteries in daily life, industrial production, aerospace and other fields, lithium resources with low natural reserves and extremely uneven distribution are becoming more scarce and in short supply. Because sodium and potassium resources are abundant and cheap, and the working principle of sodium-ion batteries or potassium-ion batteries (hereinafter referred to as sodium / potassium-ion batteries) is similar to that of lithium-ion batteries, sodium / potassium-ion batteries are very suitable for grid energy storage applications. This type of energy storage application system has high requirements for energy density and cost control. However, because the radius...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/054
CPCY02E60/10
Inventor 闫理停姜慧敏温世龙赵学波
Owner QILU UNIV OF TECH
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