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A kind of negative electrode material of lithium battery and preparation method thereof

A negative electrode material, lithium battery technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems affecting the cycle performance and application of materials, loss of electrical contact of current collectors, and pulverization of electrode materials, etc. Inexpensive, maintains integrity, avoids chalking effects

Active Publication Date: 2020-11-10
雷天温斯顿电池技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphitized carbon materials have some disadvantages. When lithium ions are intercalated, part of the solvent will also follow the intercalation, which is prone to structural damage.
Transition metal oxide materials will have large volume expansion and contraction changes during the process of intercalation and extraction of lithium ions, which will lead to the pulverization of electrode materials, and then lose electrical contact with the current collector, which greatly affects the performance of such materials. Cycle performance and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of a lithium battery negative electrode material, comprising the steps of:

[0024] Ⅰ Add 10g of ferric trichloride, 10g of tin tetrachloride, 10g of titanium tetrachloride, 1g of lanthanum chloride and 2g of sodium tetrafluoroborate into a beaker of 300g of ethylene glycol, stir for 1 hour, then slowly add 100g of sodium acetate , and after another 2 hours of vigorous stirring, the solution was transferred to a polyvinyl fluoride-lined hydrothermal reactor and reacted at 180 °C for 20 hours. After the reaction, the reactor was cooled to room temperature, the precipitate was separated by centrifugation, washed, and suction filtered, and finally the obtained sample was dried at 110°C for 18 hours, and the obtained product was porous Fe-Sn-La-O-B-F;

[0025] Ⅱ The porous Fe-Sn-La-O-B-F 12g prepared by step Ⅰ, trimethylvinylsilane 0.2g, 4,4,5,5-tetramethyl-2-(4-trifluorovinyloxy Base-phenyl)-[1,3,2]dioxaborane 0.3g, vinylcarbazole 0.5g, vinyl dimethyl...

Embodiment 2

[0030] A preparation method of a lithium battery negative electrode material, comprising the steps of:

[0031] Ⅰ Add 10g of ferric chloride, 10g of tin tetrachloride, 10g of titanium tetrachloride, 1g of lanthanum chloride and 2g of sodium tetrafluoroborate into a beaker of 350g of ethylene glycol, stir for 1.2 hours, then slowly add 100g of sodium acetate , and after another 2.3 hours of vigorous stirring, the solution was transferred to a polyvinyl fluoride-lined hydrothermal reactor and reacted at 185 °C for 22 hours. After the reaction, the reactor was cooled to room temperature, and the precipitate was separated by centrifugation, washed, and filtered with suction. Finally, the obtained sample was dried at 112°C for 19 hours, and the obtained product was porous Fe-Sn-La-O-B-F;

[0032] Ⅱ The porous Fe-Sn-La-O-B-F13g prepared by step I, 0.2g of trimethylvinylsilane, 4,4,5,5-tetramethyl-2-(4-trifluorovinyloxy Base-phenyl)-[1,3,2]dioxaborane 0.3g, vinylcarbazole 0.5g, viny...

Embodiment 3

[0037] A preparation method of a lithium battery negative electrode material, comprising the steps of:

[0038] Ⅰ Add 10g of ferric chloride, 10g of tin tetrachloride, 10g of titanium tetrachloride, 1g of lanthanum chloride and 2g of sodium tetrafluoroborate into a beaker of 400g of ethylene glycol, stir for 1.5 hours, then slowly add 100g of sodium acetate , and after another 2.5 hours of vigorous stirring, the solution was transferred to a polyvinyl fluoride-lined hydrothermal reactor and reacted at 190 °C for 23 hours. After the reaction, the reactor was cooled to room temperature, the precipitate was separated by centrifugation, washed, and suction filtered, and finally the obtained sample was dried at 115°C for 21 hours, and the obtained product was porous Fe-Sn-La-O-B-F;

[0039] Ⅱ The porous Fe-Sn-La-O-B-F 13.5g prepared by step Ⅰ, trimethylvinylsilane 0.2g, 4,4,5,5-tetramethyl-2-(4-trifluoroethylene 0.3g of oxy-phenyl)-[1,3,2]dioxaborane, 0.5g of vinyl carbazole, 0.5g o...

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PUM

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Abstract

The invention discloses a lithium battery with high energy density, and a preparation method of a lithium battery negative electrode material. The preparation method comprises the following steps: preparing a porous Fe-Sn-La-O-B-F primary product through hydrothermal reaction, and then carrying out free radical polymerization on the surface of the porous Fe-Sn-La-O-B-F primary product to form polymer-modified porous Fe-Sn-La-O-B-F; and finally, performing calcining at 450-550 DEG C in a nitrogen atmosphere to obtain the / F / B / Si / P co-doped carbon layer coated Fe-Sn-La-O-B-F. The negative electrode material of the lithium battery disclosed by the invention is low in preparation cost, high in energy density, high in battery capacity, long in cycle life and good in conductivity.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery negative electrode material and a preparation method thereof. Background technique [0002] In recent years, the energy economy of fossil fuels is facing severe challenges and has become a major factor restricting social progress and economic development. It is in this situation that the lithium-ion battery, a new energy device with high energy efficiency and clean environment, has attracted the attention of the industry, and has become an indispensable part of people's life at lightning speed. Due to its high energy density, high voltage, long cycle life, low self-discharge rate, no memory effect, stable discharge voltage, fast charge and discharge and environmental protection, lithium batteries are widely used in mobile phones, portable computers, cameras, video cameras, etc The field of electronic products. [0003] The negative electrode material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/587H01M4/62H01M10/052
CPCH01M4/366H01M4/485H01M4/525H01M4/587H01M4/625H01M10/052Y02E60/10
Inventor 钟旭航程业秀
Owner 雷天温斯顿电池技术有限公司