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Three-dimensional sea urchin-like/porous composite structure lithium ion battery Cu/CuO/SnO2/C anode and preparation method thereof

A lithium-ion battery and tin dioxide technology, which is applied to battery electrodes, secondary batteries, structural parts, etc., can solve problems that are not conducive to large-scale production of production costs, cumbersome production processes, and limited binding force, and achieve improved constant current. Charge-discharge cycle stability, ease volume expansion effect, and improve electrode conductivity

Active Publication Date: 2019-02-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method and the lithium-ion battery negative electrode prepared by it have the following disadvantages: (1) there are many operation steps and the production process is loaded down with trivial details, which is not conducive to the reduction of production cost and the realization of large-scale production; (2) due to the use of binder, the SnO 2 -CuO / graphene nanocomposites and carbon black are bonded on copper foil, the binder itself is not conductive, it will hinder electron transport, electrode polarization and impedance increase, and the rate performance is not good; (3) in lithium-ion batteries During the charge and discharge process, the intercalation and extraction of lithium ions will cause huge volume changes. The structure of the lithium ion battery negative electrode prepared by this method does not have the ability to effectively buffer the volume change during charge and discharge. The binding force between the components and between the active components and the copper foil is also relatively limited, and it is easy to cause the active components to fall off and fail during the huge volume change process of charging and discharging.

Method used

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  • Three-dimensional sea urchin-like/porous composite structure lithium ion battery Cu/CuO/SnO2/C anode and preparation method thereof
  • Three-dimensional sea urchin-like/porous composite structure lithium ion battery Cu/CuO/SnO2/C anode and preparation method thereof
  • Three-dimensional sea urchin-like/porous composite structure lithium ion battery Cu/CuO/SnO2/C anode and preparation method thereof

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Embodiment 1

[0044] In this embodiment, a three-dimensional sea urchin / porous composite structure lithium-ion battery Cu / CuO / SnO is provided 2 The preparation method of / C negative electrode, the steps are as follows:

[0045] (1) Weigh the copper block and the aluminum block according to the atomic percentage of copper and aluminum being 35:65, and melt them in a muffle furnace to obtain a copper-aluminum alloy ingot. Cut the copper-aluminum alloy ingot with a wire cutting machine into copper-aluminum alloy sheets with a thickness of 600 μm and a length and width of 7 mm, and then use 380 mesh, 800 mesh, 1200 mesh, and 2000 mesh water sandpaper to sand the surface of the copper-aluminum alloy sheet. Grinding, and then polishing with a metallographic sample polishing machine, cleaning the polished copper-aluminum alloy sheet with deionized water, and then placing it in 5wt.% hydrochloric acid for dealloying treatment, the dealloying treatment time is 5h, and passing through a water bath C...

Embodiment 2

[0052] In this embodiment, a three-dimensional sea urchin / porous composite structure lithium-ion battery Cu / CuO / SnO is provided 2 The preparation method of / C negative electrode, the steps are as follows:

[0053](1) Weigh the copper block and the aluminum block according to the atomic percentage of copper and aluminum being 30:70, and melt them in a muffle furnace to obtain a copper-aluminum alloy ingot. Cut the copper-aluminum alloy ingot with a wire cutting machine into copper-aluminum alloy sheets with a thickness of 600 μm and a length and width of 7 mm, and then use 380 mesh, 800 mesh, 1200 mesh, and 2000 mesh water sandpaper to sand the surface of the copper-aluminum alloy sheet. Grinding, and then polishing with a metallographic sample polishing machine, cleaning the polished copper-aluminum alloy sheet with deionized water, and then placing it in 8wt.% hydrochloric acid for dealloying treatment, the dealloying treatment time is 4h, passing through a water bath The de...

Embodiment 3

[0060] In this embodiment, a three-dimensional sea urchin / porous composite structure lithium-ion battery Cu / CuO / SnO is provided 2 The preparation method of / C negative electrode, the steps are as follows:

[0061] (1) Weigh a copper block and an aluminum block according to the atomic percentage of copper and aluminum being 50:50, and melt them in a muffle furnace to obtain a copper-aluminum alloy ingot. Cut the copper-aluminum alloy ingot with a wire cutting machine into copper-aluminum alloy sheets with a thickness of 400 μm and a length and width of 7 mm, and then use 380-mesh, 800-mesh, 1200-mesh, and 2000-mesh water sandpaper to sand the surface of the copper-aluminum alloy sheet. Grinding, and then polishing with a metallographic sample polishing machine, cleaning the polished copper-aluminum alloy sheet with deionized water, and then placing it in 1wt.% hydrochloric acid for dealloying treatment, the dealloying treatment time is 10h, passing through a water bath The dea...

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Abstract

The invention provides a three-dimensional sea urchin-like / porous composite structure lithium ion battery Cu / CuO / SnO2 / C anode which is composed of three-dimensional nano-porous copper, CuO film, SnO2and carbon, wherein the CuO film is a continuous film formed by partially oxidizing the surface of the three-dimensional nano-porous copper, the CuO film coating the three-dimensional nano-porous copper and the carbon coating the SnO2, so that the carbon-coated SnO2 can form a sea urchin-like carbon-coated SnO2 layer on the outer surface of the CuO film-coated three-dimensional nano-porous copper.The invention also provides a preparation method of such anode. In the invention, production process of the lithium ion battery anode is simplified, and active components are prevented from strippingoff during charge / discharge process of the lithium ion battery, thus effectively improving the cycle performance and rate capability of the lithium ion battery anode.

Description

technical field [0001] The invention belongs to the field of negative electrodes of lithium ion batteries, and relates to a three-dimensional sea urchin / porous composite structure lithium ion battery copper / copper oxide / tin dioxide / carbon (Cu / CuO / SnO 2 / C) Negative electrode and preparation method thereof. Background technique [0002] A large number of applications of clean energy have attracted extensive attention of researchers. High-efficiency energy storage devices are one of the key factors for the effective use of clean energy. Lithium-ion batteries are widely used in portable electronics due to their relatively high energy density, long life, and low self-discharge. Researchers have been working hard to improve the electrochemical performance of lithium-ion batteries to further meet their application requirements in electric vehicles, hybrid vehicles and other transportation fields. One of the key technologies to improve the performance of lithium-ion batteries is...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/38H01M4/387H01M4/48H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 刘文博成朋陈雪颜家振李宁
Owner SICHUAN UNIV
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