A kind of high cycle stability, high-capacity composite lithium battery and preparation method thereof

A technology of cycle stability and composite materials, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of volume change, tin electrode damage, electrode crushing and capacity decay, etc., to achieve large capacity and cycle stability. high effect

Inactive Publication Date: 2015-09-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest challenge in using metallic tin as an active anode material is that it is prone to large volume changes during lithium ion intercalation / deintercalation, which easily leads to electrode crushing and rapid capacity fading.
Without proper structural design, tin electrodes can be damaged after a few discharge / charge cycles

Method used

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  • A kind of high cycle stability, high-capacity composite lithium battery and preparation method thereof
  • A kind of high cycle stability, high-capacity composite lithium battery and preparation method thereof
  • A kind of high cycle stability, high-capacity composite lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A composite lithium battery with high cycle stability and large capacity, the specific preparation method is as follows:

[0040] 1) Preparation of composite nanoparticles:

[0041] ①Preparation of water-soluble cationic polymer and water-soluble anionic polymer solution

[0042] Weigh 5.0g of polyaniline and dissolve it in 250ml of distilled water;

[0043] Weigh 5.0g polyethylene sulfonic acid and dissolve in 250ml distilled water;

[0044] ② Layer-by-layer self-assembly

[0045] a: Weigh 250mg of SnO with a particle size of 10-200nm 2 Nanoparticles, placed in a 30mL centrifuge tube;

[0046] b: Add 10 mL of the polyaniline solution prepared in step ① to the centrifuge tube, sonicate (stir) for 10 min, and then centrifuge and wash with deionized water for 3 to 5 times;

[0047] c: Add 10 mL of the polyethylene sulfonic acid solution prepared in step ① to the centrifuge tube, ultrasonic (stir) for 10 min, and then centrifuge and wash with deionized water for 3 to ...

Embodiment 2

[0062] A composite lithium battery with high cycle stability and large capacity, the specific preparation method is as follows:

[0063] 1) Preparation of composite nanoparticles:

[0064] ①Preparation of water-soluble cationic polymer and water-soluble anionic polymer solution

[0065] Weigh 5.0g of polyethyleneimine and dissolve it in 250ml of distilled water;

[0066] Weigh 5.0g of polyacrylamide and dissolve it in 250ml of distilled water;

[0067] ② Layer-by-layer self-assembly

[0068] a: Weigh 250mg of SiO with a particle size of 10-200nm 2 Nanoparticles, placed in a 30mL centrifuge tube;

[0069] b: Add 10 mL of the polyethyleneimine solution prepared in step ① to the centrifuge tube, ultrasonic (stir) for 10 min, and then centrifuge and wash with deionized water for 3 to 5 times;

[0070] c: Add 10 mL of the polyacrylamide solution prepared in step ① to the centrifuge tube, sonicate (stir) for 10 min, and then centrifuge and wash with deionized water for 3 to 5 t...

Embodiment 3

[0084] A composite lithium battery with high cycle stability and large capacity, the specific preparation method is as follows:

[0085] 1) Preparation of composite nanoparticles:

[0086] ①Preparation of water-soluble cationic polymer and water-soluble anionic polymer solution

[0087] Weigh 5.0g of cationic polyacrylamide and dissolve it in 250ml of distilled water;

[0088] Weigh 5.0g polystyrene sulfonic acid and dissolve it in 250ml distilled water;

[0089] ② Layer-by-layer self-assembly

[0090] a: Weigh 250mg of GeO with a particle size of 10-200nm 2 Nanoparticles, placed in a 30mL centrifuge tube;

[0091] b: Add 10 mL of the cationic polyacrylamide solution prepared in step ① to the centrifuge tube, sonicate (stir) for 10 min, and then centrifuge and wash with deionized water for 3 to 5 times;

[0092] c: Add 10 mL of the polystyrene sulfonic acid solution prepared in step ① to the centrifuge tube, sonicate (stir) for 10 min, and then centrifuge and wash with de...

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Abstract

The invention relates to a composite lithium battery with high cycling stability and large capacity. The composite lithium battery comprises a shell, a positive pole piece, electrolyte, a negative pole piece and a diaphragm, wherein the negative pole piece is formed by coating a mixture of composite nano particles, acetylene black and polyvinylidene fluoride on a copper foil; the electrolyte is a solution of lithium perchlorate, lithium hexafluorophosphate and lithium tetrafluoroborate; the positive pole piece is formed by one of metal lithium, lithium cobalt oxide, lithium manganate and lithium iron phosphate; the composite nano particle is formed by assembling multiple layers of water-soluble ion polymers on the outer surfaces of nano particles which are made from a semiconductor material. The composite lithium battery has the beneficial effects that the self-assembled carbon layers have sufficient gaps which are convenient for lithium ions to move in and out; the carbon layers are connected with the nano particles made from the semiconductor material through polar bonds, so that the cycling stability is high, and the capacity is large.

Description

technical field [0001] The invention relates to the field of energy storage batteries, in particular to a composite material lithium battery with high cycle stability and large capacity and a preparation method thereof. Background technique [0002] Compared with other batteries, lithium batteries have the advantages of high electromotive force and high energy density, and have attracted much attention in the fields of science and industry. In recent years, in order to meet the demand for batteries with high energy density and excellent cycle characteristics, it is necessary to develop new electrode materials to replace traditional carbonaceous anodes. Some elements with semiconducting properties, such as silicon (Si), germanium (Ge), and tin (Sn), are considered as ideal substitutes for traditional carbonaceous anode active materials due to their high theoretical capacities. Taking metal tin as an example, firstly, the theoretical capacity of tin is much higher than that o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M4/48
CPCB82Y30/00H01M4/364H01M10/052Y02E60/10
Inventor 李忠涛吴明铂吴文婷吴桂良
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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