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A kind of phosphorus-doped lithium vanadate lithium ion battery negative electrode material and preparation method thereof

A lithium-ion battery, lithium heterovanadate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low migration and transmission rate, poor conductivity, low electronic conductivity of lithium transition metal salts, etc., to avoid Loss of crystal structure, good electrical conductivity, and enhanced electrochemical performance

Active Publication Date: 2021-08-03
安徽鑫辉源储能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a phosphorus-doped lithium vanadate lithium ion battery negative electrode material with low redox potential, high power density and excellent rate performance and its preparation method, and solves the problem of lithium transition Metal salts have low electronic conductivity and poor electrical conductivity, Li + and the problem of very low migration and transport rates of charges in the negative electrode material and electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of activated porous carbon: Add 85 parts of coal ash powder to the high-energy planetary ball mill, then add 600 mL of absolute ethanol, set the revolution speed of the ball mill to 260 rpm, the rotation speed to 640 rpm, and ball mill for 10 hours until the coal ash powder passes through the 1000-mesh mesh sieve, then pass the ball-milled coal ash powder and ethanol through a high-speed centrifuge at 8000 rpm, centrifuge for 3 hours to remove the upper ethanol solvent, put the centrifuged coal ash powder in a 2000 mL reaction flask, add 800 mL of distilled water, and then add 7 8 parts of sodium hydroxide and 8 parts of potassium hydroxide, placed in a constant temperature water bath, heated to 80°C and stirred at a constant speed for 15 hours, then the material in the reaction flask was passed through a high-speed centrifuge, 1500 mL of distilled water was added, and centrifuged and washed 5 times to remove Sodium hydroxide and potassium hydroxide, the ...

Embodiment 2

[0029] (1) Preparation of activated porous carbon: add 83 parts of coal ash powder to the high-energy planetary ball mill, then add 600 mL of absolute ethanol, set the revolution speed of the ball mill to 270 rpm, the rotation speed to 630 rpm, and ball mill for 10 hours until the coal ash powder passes through the 1000-mesh mesh sieve, then pass the ball-milled coal ash powder and ethanol through a high-speed centrifuge at 9000 rpm, centrifuge for 3 hours to remove the upper ethanol solvent, put the centrifuged coal ash powder in a 2000 mL reaction flask, add 900 mL of distilled water, and then add 8 9 parts of sodium hydroxide and 9 parts of potassium hydroxide, placed in a constant temperature water bath, heated to 80°C and stirred at a constant speed for 15 hours, then the material in the reaction flask was passed through a high-speed centrifuge, 1500 mL of distilled water was added, and centrifuged and washed 5 times to remove Sodium hydroxide and potassium hydroxide were ...

Embodiment 3

[0033](1) Preparation of activated porous carbon: add 80 parts of coal ash powder to the high-energy planetary ball mill, then add 700 mL of absolute ethanol, set the revolution speed of the ball mill to 270 rpm, the rotation speed to 630 rpm, and ball mill for 11 hours until the coal ash powder passes through the 1000-mesh mesh sieve, then pass the ball-milled coal ash powder and ethanol through a high-speed centrifuge at 9000 rpm, centrifuge for 4 hours to remove the upper ethanol solvent, place the centrifuged coal ash powder in a 2000 mL reaction flask, add 900 mL of distilled water, and then add 9 11 parts of sodium hydroxide and 11 parts of potassium hydroxide were placed in a constant temperature water bath, heated to 85°C and stirred at a constant speed for 18 hours, then the material in the reaction flask was passed through a high-speed centrifuge, 1800 mL of distilled water was added, and centrifuged and washed 8 times to remove Sodium hydroxide and potassium hydroxid...

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Abstract

The invention relates to the technical field of lithium ion battery negative electrode materials, and discloses a lithium ion battery negative electrode material doped with phosphorus lithium vanadate, which comprises the following formula raw materials: activated porous carbon, Li 3 V 0.85‑0.95 P 0.05‑0.15 o 4 , Adhesive. The anode material of lithium ion battery of this kind of phosphorus-doped lithium vanadate, P-doped Li 3 VO 4 prepared Li 3 V 0.85‑0.95 P 0.05‑0.15 o 4 , which enhances the Li 3 V 0.85‑ 0.95 P 0.05‑0.15 o 4 The conductivity of the battery promotes the diffusion and migration of metal ions and charges between the electrode material and the electrolyte, thereby reducing the voltage polarization during the charging and discharging process of the battery, improving the specific capacitance and electrochemical reversible capacity of the battery, and enhancing the strength of the battery. electrochemical performance, and P-doped Li 3 VO 4 , which reduces the bond length of the Li-O bond, increases the bond energy, and promotes the Li‑O bond 3 V 0.85‑0.95 P 0.05‑0.15 o 4 form a structurally stable cubic octahedral pyramid structure, avoiding the Li 3 V 0.85‑0.95 P 0.05‑0.15 o 4 In the process of lithium intercalation and delithiation, the phenomenon of loss of its crystal structure due to slight strain leads to enhanced rate performance and electrochemical cycle stability of cathode materials.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a negative electrode material for lithium ion batteries doped with phosphorus-doped lithium vanadate and a preparation method thereof. Background technique [0002] The negative electrode of lithium ion battery is made of negative electrode active material carbon material or non-carbon material, binder and additive to make paste glue evenly spread on both sides of copper foil, after drying and rolling, whether the lithium ion battery can be The key to successful production lies in the ability to prepare negative electrode materials that can reversibly de / intercalate lithium ions. Generally speaking, the negative electrode materials that have been practically used in lithium ion batteries are generally carbon materials, such as graphite, soft carbon, Hard carbon, etc., the anode materials being developed include nitrides, lithium tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/62H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 李彩琴
Owner 安徽鑫辉源储能科技有限公司
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