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A positive electrode material with a three-dimensional conductive structure for lithium-ion batteries and a preparation method thereof

A lithium-ion battery and conductive structure technology, which is applied in battery electrodes, structural parts, secondary batteries, etc., can solve the problems of lack of cycle stability, rate performance, conductivity, rate cycle stability, etc. Achieve the effect of improving the overall electrochemical performance, cycle stability and conductivity

Active Publication Date: 2022-04-12
SHANDONG XINGYU ENTERPRISE S&T
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A single lithium vanadium phosphate usually lacks cycle stability and rate capability, so scholars have conducted a series of studies on the doping modification of lithium vanadium phosphate, but the currently prepared lithium vanadium phosphate modified positive electrode materials are mostly Conductivity, rate and cycle stability are still not at a good level

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] According to the molar ratio n(Li):n(V):n(Mg):n(Cr):n(P)=3:1.7:0.2:0.1:3, respectively weigh lithium carbonate, metavanadammonium acid, hexahydrate Magnesium chloride, potassium dichromate, lithium phosphate, after mixing the weighed compounds evenly, place them in a ball mill for 10 hours at room temperature, wherein the ball-to-material ratio is 5, and the operating frequency of the ball mill is 48Hz. The material after ball milling was taken out, placed in a muffle furnace for calcination by temperature programming method, wherein the heating rate was 5°C / min, the final temperature was 300°C, the holding time was 4h, the protective atmosphere was nitrogen, and then cooled to room temperature. The calcined product was taken out, and placed in a ball mill again for 12 hours at room temperature, wherein the ball-to-material ratio was 5, and the operating frequency of the ball mill was 42 Hz. The material after ball milling was taken out, and placed in the muffle furnace...

Embodiment 2

[0034] According to the molar ratio n(Li):n(V):n(Mg):n(Ti):n(P)=3:1.6:0.3:0.1:3, respectively weigh lithium carbonate, metavanadammonium acid, hexahydrate Magnesium chloride, titanium dioxide, and lithium phosphate, after mixing the weighed compounds uniformly, put them in a ball mill at room temperature for 10 hours, wherein the ball-to-material ratio is 5, and the operating frequency of the ball mill is 48Hz. The material after ball milling was taken out, placed in a muffle furnace for calcination by temperature programming method, wherein the heating rate was 5°C / min, the final temperature was 300°C, the holding time was 4h, the protective atmosphere was nitrogen, and then cooled to room temperature. The calcined product was taken out, and placed in a ball mill again for 12 hours at room temperature, wherein the ball-to-material ratio was 5, and the operating frequency of the ball mill was 42 Hz. The material after ball milling was taken out, and placed in the muffle furnac...

Embodiment 3

[0038] Weigh lithium carbonate, metavanadammonium acid, titanium dioxide, Potassium dichromate and lithium phosphate, after mixing the weighed compounds evenly, put them in a ball mill for 10 hours at room temperature, wherein the ball-to-material ratio is 5, and the operating frequency of the ball mill is 48Hz. The material after ball milling was taken out, placed in a muffle furnace for calcination by temperature programming method, wherein the heating rate was 5°C / min, the final temperature was 300°C, the holding time was 4h, the protective atmosphere was nitrogen, and then cooled to room temperature. The calcined product was taken out, and placed in a ball mill again for 12 hours at room temperature, wherein the ball-to-material ratio was 5, and the operating frequency of the ball mill was 42 Hz. The material after ball milling was taken out, and placed in the muffle furnace again for calcination by temperature programming method, wherein the heating rate was 8°C / min, the ...

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Abstract

The invention discloses a positive electrode material with a three-dimensional conductive structure for lithium ion batteries and a preparation method thereof. The positive electrode material has a core-shell structure, the core is doped lithium vanadium phosphate, and its structural formula is Li 3 V 2‑x‑y m x N y (PO 4 ) 3 , wherein 0.1≤x≤0.9, 0.1≤y≤0.9, the doping elements M and N are selected from at least one of Mg, Ti, Cr, Al and Mn, and the M and N are different types of elements, so The shell is an in situ generated polymer with a three-dimensional conductive structure that wraps around the core. The coated particles of the prepared positive electrode material have a uniform size, and the electrical conductivity, rate performance and cycle stability are all significantly improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a positive electrode material with a three-dimensional conductive structure for lithium-ion batteries and a preparation method thereof. Background technique [0002] The demand for rechargeable batteries is increasing due to large-scale applications such as stationary electricity storage and electric vehicles. Lithium-ion batteries, which have advantages such as long cycle life and high energy density, are considered to be the most promising device candidates. Lithium-ion batteries have been widely used in the field of small electronic devices such as mobile phones, notebook computers, cameras and portable measuring instruments, and have shown broad application prospects in the fields of electric bicycles and automobiles. [0003] The improvement of the performance of lithium-ion batteries often depends on the development and improvement of cathode material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M10/0525
CPCH01M4/366H01M4/5825H01M4/624H01M4/136H01M10/0525Y02E60/10
Inventor 卢昌琴
Owner SHANDONG XINGYU ENTERPRISE S&T