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Lithium ion battery anode material, and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of inability to effectively suppress the volume expansion of silicon, high industrialization costs, and difficult control of the manufacturing process, so as to improve the first Coulombic efficiency and Improved cycle performance, Coulombic efficiency, improved sintering effect

Inactive Publication Date: 2017-04-19
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain nano-silicon-carbon composite materials very well, in the preparation process, the amorphous carbon layer of the composite fiber membrane obtained by the uniaxial electrospinning process is difficult to completely cover the active particles, and cannot effectively inhibit silicon carbon composites. The problem of volume expansion, and the target product is ground and coated to be assembled into a button battery. The process is complicated, the process is difficult to control, the industrialization cost is high, and the cycle performance is poor.

Method used

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  • Lithium ion battery anode material, and preparation method thereof
  • Lithium ion battery anode material, and preparation method thereof
  • Lithium ion battery anode material, and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0032](1) 4.5g polyacrylonitrile was dissolved in 22.5g N'N-dimethylformamide solution and made into sol A; 4.5g polyacrylonitrile, 1g nano silicon monoxide powder, 1g surfactant benzyl Sodium sulfonate and 22.5g N'N-dimethylformamide solution were formulated into sol B; among them, sol A was stirred in a water bath at 25°C for 10 hours, and sol B was first subjected to magnetic stirring for 1 hour, then ultrasonication for 1 hour, and finally Stir again for 2 hours, obtain Sol A and Sol B of certain viscosity respectively after fully stirring;

[0033] (2) Pour the sol A and sol B prepared above into two syringes respectively, wherein the syringe containing sol A communicates with the shell of the coaxial nozzle of the electrospinning machine, and the syringe containing sol B communicates with the electrospinning machine. The core layer of the shaft nozzle is spun by an electrospinning machine; the spinning voltage is controlled to 20kV, and the distance between the nozzle an...

Embodiment 2

[0041] (1) 2g pure polyvinyl alcohol (molecular weight is 80000) is dissolved in 16g N'N-dimethylacetamide solution and is made into sol A; 2g pure polyvinyl alcohol, 1g nano-silica powder, 0.5g Surfactant sodium phenylmethyl sulfonate and 16g of N'N-dimethylacetamide solution were formulated into sol B; among them, sol A was stirred in a water bath at 40°C for 8 hours, and sol B was first subjected to magnetic stirring for 2 hours, and then 1 Ultrasound for 1 hour, and finally stirred for 2 hours, and after fully stirring, Sol A and Sol B with a certain viscosity were obtained respectively;

[0042] (2) Pour the sol A and sol B prepared above into two syringes respectively, wherein the syringe containing sol A communicates with the shell of the coaxial nozzle of the electrospinning machine, and the syringe containing sol B communicates with the electrospinning machine. The core layer of the shaft nozzle is spun by an electrospinning machine; the spinning voltage is controlled...

Embodiment 3

[0049] (1) 1.75g ​​polyvinylpyrrolidone was dissolved in 17.5g ethanol solution and made into sol A; 1.75g ​​polyvinylpyrrolidone, 1.5g nano silicon monoxide powder, 0.3g surfactant sodium phenylmethyl sulfonate and 17.5 g ethanol solution was made into sol B; among them, sol A was stirred in a 60°C water bath for 6 hours, and sol B was subjected to magnetic stirring for 3 hours, ultrasonication for 1 hour, and finally stirring for 3 hours. Sol A and Sol B;

[0050] (2) Pour the sol A and sol B prepared above into two syringes respectively, wherein the syringe containing sol A communicates with the shell layer of the coaxial nozzle of the electrospinning machine, and the syringe containing sol B communicates with the electrospinning machine. The shell layer of the shaft nozzle is spun by an electrospinning machine; the spinning voltage is controlled to 25kV, and the distance between the nozzle and the receiving device is 10cm; the receiving device is a roller;

[0051] (3) Pu...

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Abstract

The invention discloses a lithium ion battery anode material, and a preparation method thereof. The preparation method comprises following steps: 1, a carbon source is mixed with an organic solvent so as to obtain a sol A; 2, nano silicon monoxide, a surfactant, the carbon source, and the organic solvent are mixed so as to obtain a sol B; 3, the sol A and the sol B are taken as raw materials for electrostatic spinning so as to obtain a composite fiber with a double-layer structure, wherein a shell layer is formed by the sol A, and a core layer is formed by the sol B; and 4, the composite fiber is dried, is subjected to pre-oxidation, and then is subjected to calcination at an insert atmosphere. The process of the preparation method is simple and controllable; large-scale production is easy to realize; an obtained composite material is a carbon-coated flexible self-supported silicon monoxide / amorphous carbon composite fiber anode material; in charging-discharging process of lithium ion batteries prepared from the composite material, the volume change of silicon-based oxide anode materials is controlled effectively, electrode structures are maintained to be complete, first time coulombic efficiency is increased obviously, cycling life is prolonged, and electrochemical performance is excellent.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Due to its high content in the earth's crust, high theoretical capacity, low discharge voltage, and superior safety performance, silicon has become a research hotspot for lithium-ion battery anode materials. However, silicon has a large volume effect when deeply deintercalating lithium, poor cycle performance caused by easy stripping from the current collector, low first-time Coulombic efficiency, and low conductivity of silicon itself also limit its commercial application in lithium-ion batteries. [0003] Studies have shown (Zhou W, Upreti S, Whittingham M S. High performance Si / MgO / graphite composite as the anode for lithium-ion batteries[J]. Electrochemistry Communications, 2011,13(10):1102-1104), silicon monoxide As a negative electrode material fo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M10/0525D01F8/18B82Y30/00
CPCB82Y30/00D01F8/18H01M4/366H01M4/48H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 朱生文李文余心亮李靖
Owner TIANNENG SAFT ENERGY JOINT CO
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