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Method of improving performance of lithium ion battery silicon anode material

A lithium-ion battery and material performance technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor conductivity, low first charge and discharge efficiency, etc., and achieve the effect of improving other performances

Inactive Publication Date: 2018-10-19
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a method for improving the performance of silicon negative electrode materials for lithium-ion batteries, which can effectively solve the problem of the low initial charge and discharge efficiency of existing silicon oxide materials. And the problem of poor conductivity

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  • Method of improving performance of lithium ion battery silicon anode material
  • Method of improving performance of lithium ion battery silicon anode material

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Embodiment 1

[0035] A method for improving the performance of a lithium-ion battery silicon negative electrode material, comprising the following steps:

[0036] (1) Negative electrode preparation of silicon oxide composite material:

[0037] 1) Weigh a certain amount of SiO powder, pour it into deionized water whose mass is 10 times that of SiO, and then add a certain amount of graphite and glucose; specifically, weigh 45g of SiO powder, pour it into 450g of In water ethanol, then add 4.5g of graphite and 4.5 of glucose. Also, the particle size of the SiO powder is 10 μm.

[0038] 2) Put the mixed solution into a high-energy ball mill for ball milling, the ball milling time is 5 hours, and the rotation speed is 900r / m.

[0039] 3) Put the ball-milled precursor material into a tube furnace, heat it to 800°C in an argon atmosphere, keep it warm for 5 hours, and then cool it down to room temperature naturally; specifically, dry the ball-milled precursor material and pour it into Crucible,...

Embodiment 2

[0047] A method for improving the performance of a lithium-ion battery silicon negative electrode material, comprising the following steps:

[0048] (1) Negative electrode preparation of silicon oxide composite material:

[0049] 1) Weigh a certain amount of SiO powder, pour it into deionized water whose mass is 10 times that of SiO, and then add a certain amount of graphite and glucose; specifically, weigh 50g of SiO powder, pour it into 500g of In water ethanol, then add the glucose of 5g graphite and 5g. Also, the particle diameter of the SiO powder is 10 μm.

[0050] 2) Put the mixed solution into a high-energy ball mill for ball milling, the ball milling time is 6 hours, and the rotation speed is 800r / m.

[0051] 3) Put the ball-milled precursor material into a tube furnace, heat it to 1000°C in an argon atmosphere, keep it warm for 4 hours, and then cool it down to room temperature naturally; specifically, dry the ball-milled precursor material and pour it into Crucib...

Embodiment 3

[0058] A method for improving the performance of a lithium-ion battery silicon negative electrode material, comprising the following steps:

[0059] (1) Negative electrode preparation of silicon oxide composite material:

[0060] 1) Weigh a certain amount of SiO powder, pour it into deionized water whose mass is 10 times that of SiO, and then add a certain amount of graphite and glucose; specifically, weigh 55g of SiO powder, pour it into 550g of In water ethanol, then add the glucose of 5.5g graphite and 5.5g. Also, the particle diameter of the SiO powder is 10 μm.

[0061] 2) Put the mixed solution into a high-energy ball mill for ball milling, the ball milling time is 7 hours, and the rotation speed is 950r / m.

[0062] 3) Put the ball-milled precursor material into a tube furnace, heat it to 850°C in an argon atmosphere, keep it warm for 6 hours, and then cool it down to room temperature naturally; specifically, dry the ball-milled precursor material and pour it into Cru...

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Abstract

The invention discloses a method of improving the performance of a lithium ion battery silicon anode material. The method comprises following steps: (1) preparing an anode material made of a silicon monoxide (SiO) composite material: (a) weighing a certain amount of SiO powder, pouring SiO powder into deionized water, wherein the mass ratio of SiO powder to deionized water is 1:10, and then addinga certain amount of graphite and glucose; (b) filling the obtained solution into a high energy ball milling machine, and carrying out ball milling; (c) after ball milling, placing the obtained precursor in a tubular furnace; and (d) mixing the prepared SiO / C composite material with a conductive agent (acetylene black) and an adhesive (PVDF) according to a certain ratio; and (2) carrying out a pre-lithiation treatment on an electrode. At first, a SiO material is compounded with a carbon material, then lithium is added into the composite material to carry out pre-lithiation modification, aftermodification, the modified SiO composite material is taken as a negative electrode, for the first time, the Coulomb efficiency is increased to 81% from 77%, and other performances of the SiO compositematerial are also greatly enhanced.

Description

technical field [0001] The invention relates to the technology in the field of negative electrode materials, in particular to a method for improving the performance of silicon negative electrode materials for lithium ion batteries. Background technique [0002] With the growth of the world's population and rapid economic development, energy shortages, environmental pollution and other issues have posed severe challenges to the sustainable development of countries around the world, and issues such as smog in urban life are also alerting people to the need for a low-carbon life in the future sex. Green energy has gradually become the focus of development and utilization. The optimal utilization of green energy requires the support of energy storage and power sources with long life, high specific energy and specific power. With its high energy density, high working voltage, long cycle life, good load characteristics, fast charging speed, safety and no pollution, lithium-ion b...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/625Y02E60/10
Inventor 杨昌平周鹏伟赵东辉
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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