Positive pole piece, negative pole piece and high-energy density lithium ion battery

A technology for lithium-ion batteries and negative pole pieces, which is applied to battery electrodes, secondary batteries, electrode carriers/collectors, etc., can solve the problems of low energy density and achieve the effect of improving energy density, simple method, and easy implementation

Inactive Publication Date: 2020-04-10
天津普兰能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention aims to propose a positive pole piece, a negative pole piece and a high energy density lithium-ion battery to solve the technical problem of low energy density of lithium-ion batteries in the prior art

Method used

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  • Positive pole piece, negative pole piece and high-energy density lithium ion battery
  • Positive pole piece, negative pole piece and high-energy density lithium ion battery
  • Positive pole piece, negative pole piece and high-energy density lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The present embodiment provides a method for improving the energy density of a lithium-ion battery, which comprises the steps of:

[0030] Step 1: Use a lithium-containing copper foil with a thickness of 30 microns and a lithium content of 6% as the current collector of the negative electrode, and apply a conductive coating with SP as the conductive agent and sodium carboxymethyl cellulose as the binder. Obtain a lithium-containing copper foil with a conductive coating; use aluminum foil as a current collector for the positive electrode, and coat a conductive coating with SP as a conductive agent and sodium carboxymethyl cellulose as a binder to obtain a conductive coating with a aluminum foil;

[0031] Step 2: Prepare the negative pole piece, fully mix the silicon carbon material, SP and polytetrafluoroethylene, then roll it into a thin film, and then hot press it on the lithium-containing copper foil with a conductive coating to obtain the negative pole piece;

[003...

Embodiment 2

[0036] The present embodiment provides a method for improving the energy density of a lithium-ion battery, which comprises the steps of:

[0037] Step 1: Use a lithium-containing copper foil with a thickness of 12 microns and a lithium content of 12% as the current collector of the negative electrode, and coat a conductive coating with carbon nanotubes as the conductive agent and polyacrylic acid as the binder to obtain a There is a lithium-containing copper foil with a conductive coating; aluminum foil is used as a current collector for the positive electrode, and a conductive coating with carbon nanotubes as a conductive agent and polyacrylic acid as a binder is coated to obtain an aluminum foil with a conductive coating;

[0038] Step 2: Prepare the negative electrode sheet, fully mix silicon oxide, acetylene black and polytetrafluoroethylene, then roll it into a film, and then hot press it on the lithium-containing copper foil with a conductive coating to obtain the negativ...

Embodiment 3

[0043] The present embodiment provides a method for improving the energy density of a lithium-ion battery, which comprises the steps of:

[0044] Step 1: Use a lithium-containing copper foil with a thickness of 7 microns and a lithium content of 2% as the current collector of the negative electrode, and apply a conductive coating with graphene as the conductive agent and polyacrylic acid as the binder to obtain Lithium-containing copper foil with conductive coating; aluminum foil is used as the current collector of the positive electrode, and a conductive coating with graphene as the conductive agent and polyacrylic acid as the binder is coated to obtain an aluminum foil with a conductive coating;

[0045]Step 2: Prepare the negative pole piece, fully mix the nano-silicon material, carbon nanotubes and polyvinylidene fluoride, then spray it on the lithium-containing copper foil with a conductive coating, and obtain the negative pole piece through heating and rolling;

[0046] ...

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Abstract

The invention provides a positive pole piece, a negative pole piece and a high-energy density lithium ion battery. The positive pole piece comprises a negative current collector, and a conductive coating and an active material layer which are sequentially coated on the surface of the negative current collector, and the material of the active material layer is formed by mixing an anode active material, a conductive agent and a binder. According to the lithium ion battery disclosed by the invention, irreversible capacity loss caused by adopting high-specific-capacity anodes such as a silicon-based material, a tin-based material and a metal oxide is reduced, so that the energy density is improved; and moreover, the pole piece is prepared by adopting a solvent-free method, so that the compaction density of the pole piece is improved, the energy density is further improved, and the use of an organic solvent is avoided.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a positive pole piece, a negative pole piece and a high energy density lithium ion battery. Background technique [0002] In response to the gradual depletion of fossil energy and the environmental problems caused by the use of fossil energy, research and development of clean and efficient energy storage technology has become a global consensus, especially focusing on lithium-ion battery technology. [0003] Compared with traditional energy storage devices such as lead-acid and nickel-metal hydride, lithium-ion batteries have the advantages of high working voltage, good cycle performance, and high energy and power density. They are widely used in mobile phones, notebook computers, handheld computers and other electronic products. In recent years, the development of new energy vehicles, energy storage and other fields has been particularly rapid. However, the popu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/62H01M4/139H01M10/0525
CPCH01M4/139H01M4/621H01M4/624H01M4/667H01M10/0525Y02E60/10
Inventor 陈永胜随东吴美超崔维国王茂范
Owner 天津普兰能源科技有限公司
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