Lithium sulfide/nano silicon carbon whole battery and preparation method and application thereof

A nano-silicon and lithium sulfide technology, applied in electrode manufacturing, secondary batteries, battery electrodes, etc., can solve the problems of poor first efficiency and cycle stability, easily damaged material structure, large irreversible capacity of batteries, etc. The process steps are concise, the removal of impurities is saved, and the operation is simple.

Inactive Publication Date: 2017-10-20
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it exhibits a huge volume expansion effect during the intercalation / delithiation process, which makes the material structure vulnerable to damage, resulting in poor first-time efficiency and cycle stability.
To deal with the above problems, the commonly used method is to nanonize, alloy and compound silicon, but the process is complicated, and the prepared battery has the problems of large irreversible capacity, poor conductivity and poor cycle stability.

Method used

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  • Lithium sulfide/nano silicon carbon whole battery and preparation method and application thereof
  • Lithium sulfide/nano silicon carbon whole battery and preparation method and application thereof
  • Lithium sulfide/nano silicon carbon whole battery and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] (1) The preparation of carbon-coated lithium sulfide cathode material, the specific steps are as follows:

[0086] (1) Disperse 16.7g of lithium sulfate in 200mL of deionized water, stir at a high speed of 1500r / min for 0.5h to obtain solution A;

[0087] (2) Dissolve 125g of sucrose in 200mL of deionized water, and stir at a high speed of 1500r / min for 0.5h to obtain a mixed solution B;

[0088] (3) Add the solution A prepared in step (1) to the solution B prepared in step (2), mix well to obtain a mixed solution C, and then carry out closed-loop spray drying of the mixed solution C to obtain a precursor Body D; wherein, the rotational speed of the centrifugal atomizer is 20000r / min during the closed cycle spray drying powder making, the inlet and outlet temperatures are 200°C and 100°C respectively, and the feed rate is 15mL / min;

[0089] (4) Place the precursor D prepared in step (3) in a tube furnace, feed nitrogen gas with a purity of 99.99%, and raise the tempera...

Embodiment 2

[0103] (1) The preparation of carbon-coated lithium sulfide cathode material, the specific steps are as follows:

[0104] (1) Disperse 16.7g of lithium sulfate in 200mL of deionized water, stir at a high speed of 1500r / min for 0.5h to obtain solution A;

[0105] (2) Dissolve 120g of asphalt in 200mL of tetrahydrofuran, and stir at a high speed of 1500r / min for 1h to obtain a mixed solution B;

[0106] (3) Add the solution A prepared in step (1) to the solution B prepared in step (2) and mix evenly to obtain a mixed solution C, and then carry out closed-loop spray drying of the mixed solution C to obtain a precursor D; Among them, the rotational speed of the centrifugal atomizer is 20000r / min, the inlet and outlet temperatures are 220°C and 100°C respectively, and the feed rate is 15mL / min during the closed cycle spray drying powder making;

[0107] (4) Place the precursor D prepared in step (3) in a tube furnace, feed in nitrogen gas with a purity of 99.99%, raise the temperatu...

Embodiment 3

[0121] (1) The preparation of carbon-coated lithium sulfide cathode material, the specific steps are as follows:

[0122] (1) Disperse 16.7g of lithium sulfate in 200mL of deionized water, stir at a high speed of 1500r / min for 0.5h to obtain solution A;

[0123] (2) Dissolve 120g polyvinyl alcohol (average molecular weight 20000) in 200mL deionized water, and stir at 60°C and 1500r / min at high speed for 1h to obtain mixed solution B;

[0124] (3) Add the solution A prepared in step (1) to the solution B prepared in step (2) and mix evenly to obtain a mixed solution C, and then carry out closed-loop spray drying of the mixed solution C to obtain a precursor D; Among them, the rotational speed of the centrifugal atomizer is 20000r / min, the inlet and outlet temperatures are 220°C and 100°C respectively, and the feed rate is 15mL / min during the closed cycle spray drying powder making;

[0125] (4) Place the precursor D prepared in step (3) in a tube furnace, feed nitrogen gas wit...

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Abstract

The invention discloses a lithium sulfide / nano silicon carbon whole battery and a preparation method and application thereof. The preparation method includes following steps: dispersing lithium sulfate into water, dispersing an organic carbon source into an organic solvent, drying and granulating to prepare a composite precursor after sufficient mixing, and calcining at high temperature to obtain a carbon coated lithium sulfide composite anode material; respectively dispersing nano silicon, the organic carbon source and artificial graphite into the organic solvent, drying and granulating after sufficient mixing, and calcining at high temperature to obtain a carbon coated silicon carbon composite cathode material; assembling the carbon coated lithium sulfide composite anode material and the carbon coated silicon carbon composite cathode material to obtain the lithium sulfide / nano silicon carbon whole battery. The preparation method is simple in preparation process, simple and convenient to operate and suitable for large-scale production; the whole battery prepared by the method has the advantages of high first-time charging and discharging efficiency, high specific capacity and good circulating performance, can meet needs of high-capacity electronic equipment and is suitable for electromobiles or portable electronic products.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a lithium sulfide / nano-silicon-carbon full battery and its preparation method and application. Background technique [0002] Lithium-ion battery technology is considered to be one of the most ideal green energy storage and conversion technologies. Compared with secondary batteries such as nickel-metal hydride and nickel-chromium, lithium-ion batteries have the advantages of long life, high energy density, and no memory effect, and have been widely used in portable electronic equipment, communication equipment, and electric vehicle markets. Among them, the selection of cathode materials and anode materials plays a vital role in the performance of lithium-ion batteries. [0003] Using lithium-sulfur as the positive electrode material of lithium-ion batteries is one of the hotspots in the research of high-capacity lithium-ion batteries in recent years. Com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/38H01M4/58H01M10/0585
CPCH01M4/0416H01M4/0471H01M4/362H01M4/386H01M4/5815H01M10/0585Y02E60/10Y02P70/50
Inventor 胡晓乔王韶峰侯贤华
Owner SOUTH CHINA NORMAL UNIVERSITY
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