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Lithium ion battery and preparation method thereof

A technology for lithium ion batteries and battery negative electrodes, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of carbon layer separation, peeling, electrode pulverization, and affecting battery cycle stability.

Inactive Publication Date: 2014-12-10
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But they also have big problems as lithium-ion battery negative electrode materials: during battery charging and discharging, the negative electrode material produces serious volume expansion effect (silicon is as high as 300%), which will cause electrode pulverization, thereby reducing battery life; Secondary charging and discharging will cause agglomeration of negative electrode materials, which will affect the cycle stability of the battery
However, the thickness of the carbon coating layer of the composite material prepared by this method is uneven, and the bonding force between the carbon layer and the silicon alloy is weak. During the rapid charge and discharge process, the carbon layer is easy to separate and peel off from the silicon alloy, which seriously affects the cycle of the battery. stable performance

Method used

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  • Lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) dissolving the organic precursor polyacrylonitrile in tetrahydrofuran to form a homogeneous solution with a mass concentration of 10%;

[0037] (2) adding a certain amount of silicon into the above solution, and mixing the silicon with the solution evenly to form a spinning stock solution; the amount of silicon added is 5wt.% of the organic precursor;

[0038] (3) Prepare the organic fiber felt containing silicon by the above spinning stock solution by electrospinning; wherein the spinning stock solution propulsion speed is 1mL / h, the voltage is 15KV, and the receiving distance is 10cm;

[0039] (4) Carbonize the organic fiber felt in an argon atmosphere, and heat up at a heating rate of 10°C / min until the temperature of the furnace body is 900°C; after 4 hours of heat preservation, all the organic fibers are pyrolyzed and carbonized to form carbon fibers ;

[0040] (5) Pulverizing the material obtained in the previous step to obtain the battery negative electrode ...

Embodiment 2

[0044] (1) dissolving the organic precursor polyacrylonitrile in dimethyl sulfoxide to form a homogeneous solution with a mass concentration of 30%;

[0045] (2) adding a certain amount of silicon monoxide into the above solution, and mixing the silicon monoxide with the solution evenly to form a spinning stock solution; the amount of silicon monoxide added is 5wt.% of the organic precursor;

[0046] (3) Prepare the organic fiber mat containing silicon monoxide by electrospinning the above spinning stock solution; wherein the spinning stock solution advance speed is 1.5mL / h, the voltage is 25KV, and the receiving distance is 15cm;

[0047] (4) Carbonize the organic fiber mat in a mixed gas of 5% hydrogen and 95% argon, and heat up at a heating rate of 5°C / min until the temperature of the furnace body is 900°C; All organic fibers are pyrolyzed and carbonized to form carbon fibers;

[0048] (5) pulverizing the material obtained in the previous step to obtain the negative electr...

Embodiment 3

[0052] (1) dissolving the organic precursor polyacrylonitrile in dimethylamide to form a homogeneous solution with a mass concentration of 15%;

[0053] (2) adding a certain amount of silicon dioxide to the above solution, and mixing the silicon dioxide with the solution evenly to form a spinning stock solution; the amount of silicon dioxide added is 10wt.% of the organic precursor;

[0054] (3) Prepare the organic fiber felt containing silicon dioxide by electrospinning the above spinning stock solution; wherein the spinning stock solution propulsion speed is 1.2mL / h, the voltage is 18KV, and the receiving distance is 11.5cm;

[0055] (4) Carbonize the organic fiber mat in an argon atmosphere, and heat up at a heating rate of 5°C until the temperature of the furnace body is 800°C; after 4 hours of heat preservation, all the organic fibers are pyrolyzed and carbonized to form carbon fibers;

[0056] (5) pulverizing the material obtained in the previous step to obtain the negativ...

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Abstract

The invention provides a lithium ion battery and a preparation method thereof. The battery comprises an anode film, a cathode film, a diaphragm and an electrolyte, wherein the anode film comprises an anode material, acetylene black and polyvinylidene fluoride; the anode material comprises two layers, namely a core layer and a cage layer; the core layer has higher lithium storage capacity; and the cage layer is a structural layer which is formed by mutual entanglement of carbon fibers, has a loose structure, is internally provided with uniform three-dimensional holes and is integrally cage-shaped. The anode material of the lithium ion battery provided by the invention can be prepared by two methods, namely an electrostatic spinning method and a biological culture method. The surface of the core layer of the anode material of the lithium ion battery is uniformly coated by the cage layer, so that volume change of the core layer in the Li<+> intercalation / de-intercalation process can be effectively relieved and the cycling stability of the lithium ion battery can be maintained.

Description

technical field [0001] The invention relates to a lithium ion battery and a preparation method thereof, in particular to a lithium ion battery using a cage structure to coat a core layer negative electrode material and a preparation method thereof. Background technique [0002] With the rapid development of the microelectronics industry and the automobile industry, and the popularization of various portable communication devices, personal computers, and small electronic devices, human requirements for lithium-ion batteries are also moving towards high energy density, high power density, high safety, Development in the direction of long life, fast charging and discharging, and light and thin. At present, commercial lithium-ion batteries use graphite as the negative electrode and lithium-containing compounds as the positive electrode. Among them, the theoretical specific capacity of graphite is only 372mAh / g, which has become a huge obstacle to improving the performance of li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/62H01M4/13H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 白雪君程旭王彪王华平
Owner DONGHUA UNIV
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