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Phosphorus-doped lithium-vanadate lithium ion battery negative electrode material and preparation method thereof

A lithium-ion battery and lithium heterovanadate technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor conductivity, low electronic conductivity of lithium transition metal salts, low migration and transmission rates, etc., and achieve conductive Good performance, enhanced electrochemical performance, and the effect of avoiding loss of crystal structure

Active Publication Date: 2020-02-21
萧县鑫辉源电池有限公司
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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 a 1000-mesh mesh Sieve, then pass the ball-milled coal ash powder and ethanol through a high-speed centrifuge at a speed of 8000rpm, centrifuge for 3 hours to remove the upper ethanol solvent, put the centrifuged coal ash powder in a 2000mL reaction bottle, add 800mL distilled water, and then add 7 1 part of sodium hydroxide and 8 parts of potassium hydroxide were placed in a constant temperature water bath, heated to 80°C and stirred at a constant speed for 15 hours. Sodium hydroxide and potassium hydroxide, the cleaned activated coal ash powder was placed in an oven and heated to 80°C to dry the water for 5 hours to obtain activated porous carbon component 1.

[0026]...

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 a 1000-mesh mesh Sieve, then pass the ball-milled coal ash powder and ethanol through a high-speed centrifuge at a speed of 9000rpm, centrifuge for 3 hours to remove the upper ethanol solvent, put the centrifuged coal ash powder in a 2000mL reaction bottle, add 900mL distilled water, and then add 8 1 part of sodium hydroxide and 9 parts of potassium hydroxide were placed in a constant temperature water bath, heated to 80°C and stirred at a constant speed for 15 hours. Sodium hydroxide and potassium hydroxide, the cleaned activated coal ash powder is placed in an oven and heated to 80° C. to dry the water for 6 hours to obtain the activated porous carbon component 2.

[...

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, and the rotation speed to 630 rpm, and ball mill for 11 hours until the coal ash powder passes through a 1000-mesh screen Sieve, then pass the ball-milled coal ash powder and ethanol through a high-speed centrifuge at a speed of 9000rpm, centrifuge for 4h to remove the upper ethanol solvent, put the centrifuged coal ash powder in a 2000mL reaction bottle, add 900mL distilled water, and then add 9 One part 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. Sodium hydroxide and potassium hydroxide, and the cleaned activated coal ash powder was placed in an oven and heated to 85° C. to dry the water for 6 hours to obtain the activated porous carbon component...

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PUM

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Abstract

The invention relates to the technical field of lithium ion battery negative electrode materials, and discloses a phosphorus-doped lithium-vanadate lithium ion battery negative electrode material. Thematerial comprises the following formula raw materials: activated porous carbon, Li<3>V<0.85-0.95>P<0.05-0.15>O<4>, and an adhesive. According to the negative electrode material, the Li<3>V<0.85-0.95>P<0.05-0.15>O<4> is obtained through the P-doped Li<3>VO<4>, so the conductivity of the Li<3>V<0.85-0.95>P<0.05-0.15>O<4> is enhanced, and the diffusion and migration of metal ions and charges between the electrode material and the electrolyte are promoted; therefore, the voltage polarization in the charging and discharging process of the battery is reduced, the specific capacitance and the electrochemical reversible capacity of the battery are improved, and the electrochemical performance of the battery is enhanced. Moreover, through P-doped Li<3>VO<4>, the bond length of a Li-O bond is reduced, the key energy is increased, the Li<3>V<0.85-0.95>P<0.05-0.15>O<4> is promoted to form a cubic octahedral conical structure with a stable structure, and the phenomenon that the crystal structureof Li<3>V<0.85-0.95>P<0.05-0.15>O<4> is lost due to micro strain in the lithium intercalation and deintercalation processes is avoided, so the rate capability and the electrochemical cycling stabilityof the positive electrode material are enhanced.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a lithium ion battery negative electrode material doped with phosphorus lithium vanadate and a preparation method thereof. Background technique [0002] The negative electrode of the lithium-ion battery is made of a negative electrode active material carbon material or non-carbon material, a binder and an additive. The paste adhesive is evenly applied on both sides of the copper foil, dried and rolled. Can the lithium-ion battery The key to successful production lies in the ability to prepare negative electrode materials that can reversibly detach / 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 under development include nitrides, lithium transition meta...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/62H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 李彩琴
Owner 萧县鑫辉源电池有限公司
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