Multilayer nano-composite electrode for lithium ion battery and preparation method thereof

A lithium-ion battery and nanocomposite technology, which is applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc. problem, to achieve the effect of reducing irreversible capacity, increasing energy density, and reducing shedding

Pending Publication Date: 2017-04-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite is currently used as the negative electrode active material for lithium-ion batteries. However, the theoretical specific capacity of graphite is not high enough to meet the growing energy demand.
As an active material, silicon has a high theoretical specific capacity, but the volume expansion is greater than 300%, which will cause the active material to pulverize and fall off, increase the irreversible capacity, and shorten the battery life
Many researchers use carbon-silicon core-shell nanostructures as the active material, which can well limit the

Method used

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  • Multilayer nano-composite electrode for lithium ion battery and preparation method thereof
  • Multilayer nano-composite electrode for lithium ion battery and preparation method thereof
  • Multilayer nano-composite electrode for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1

[0038] The preparation of a novel multilayer nanocomposite electrode for lithium ion batteries includes the following steps:

[0039] (1) Copper powder sintering: Weigh the copper powder and place it in a customized graphite mold, then place it in a vacuum resistance furnace and sinter it at a high temperature in a hydrogen environment. The sintering temperature is 900°C and the holding time is 2h;

[0040] (2) The growth of copper oxide nanoneedles: place the sintered sample in a muffle furnace and heat it at high temperature in the air at a heating temperature of 500°C and a holding time of 7 hours to obtain copper oxide with nanoneedles grown;

[0041] (3) Reduction of copper oxide nano-needles: Place the copper oxide with nano-needles in a vacuum resistance furnace, and reduce the copper oxide nano-needles in a hydrogen environment with a heating temperature of 250°C and a holding time of 2 hours to obtain a copper current collector ;

[0042] (4) Deposition of s...

Example Embodiment

[0046] Example 2

[0047] The multilayer nanocomposite electrode prepared in Example 1 is used to assemble a lithium-ion half-cell, and the assembly diagram is as follows image 3 As shown, it includes an upper battery shell 1, an elastic sheet 2, a gasket 3, a lithium sheet 4, a diaphragm 5, an electrolyte 6, a lower battery shell 7 and a novel multilayer nanocomposite electrode 8;

[0048] The multilayer nano composite electrode 8 is placed on the lower battery shell 7. The electrolyte 6 directly infiltrates the active material of the needle-shaped nano composite layer on the multilayer nano composite electrode 8, and the electrolyte 6 is filled with the multilayer nano composite electrode 8. The entire cavity formed by the shell 7 and the diaphragm 5; the lithium sheet 4 is tightly attached to the diaphragm 5, and the upper surface of the lithium sheet 4 is placed on the upper surface of the lithium sheet 4 sequentially from the bottom to the top with the gasket 3 and the elasti...

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Abstract

The invention discloses a multilayer nano-composite electrode for a lithium ion battery and preparation method thereof. The multilayer nano-composite electrode is mainly composed of a copper current collector and multilayer active substances; the copper current collector is provided with a porous structure and a nano-needle structure; the multilayer active substances comprise a silicon layer and a carbon layer. The preparation method of the multilayer nano-composite electrode is as follows: (1) sintering of copper powder; (2) growing and reducing of copper oxide nanoneedle structure; (3) depositing of a silicon nanometer layer; and (4) cladding of the carbon nanometer layer. The multilayer nano-composite electrode disclosed by the invention can effectively limit the sharp change of the volume of silicon active substance in the charging/discharging process of the battery, thereby prolonging the cycle life of the battery; and meanwhile, the porous structure and the nano-needle structure of the current collector are directly and tightly contacted with the active substances, the use of each of the adhesive and the conductive additive is reduced, thereby facilitating the improvement of the reversible capacity, the coulombic efficiency, the cycle stability and other electrochemical properties of the battery.

Description

Technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a multilayer nano composite electrode for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have only been in existence for less than thirty years. Compared with valve-regulated lead-acid batteries, rechargeable nickel-cadmium batteries or nickel-hydrogen batteries, lithium-ion batteries have a high unit energy density and a wide range of applications, as well as excellent high current Discharge and other advantages have become the best among these secondary batteries. At the beginning of the new century, with the development and development of new energy power vehicles, energy reforms are being promoted for the purpose of reducing environmental pollution caused by energy consumption and replacing the old energy structure based on fossil fuels. The energy structure with lithium-ion batteries as the core is being p...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/66H01M4/36H01M4/38H01M4/62H01M4/1395H01M10/0525B82Y30/00
CPCH01M4/134H01M4/1395H01M4/366H01M4/386H01M4/628H01M4/661H01M10/0525B82Y30/00H01M2004/021Y02E60/10
Inventor 袁伟邱志强罗健潘保有黄诗敏闫志国谭振豪汤勇
Owner SOUTH CHINA UNIV OF TECH
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