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Lithium battery negative electrode and lithium battery

A lithium battery and negative electrode technology, which is applied in the field of lithium battery negative electrodes, can solve the problems of heavy negative electrode mass, complicated preparation methods, and low energy density, and achieve the effects of fewer steps, simple preparation methods, and remarkable effects

Inactive Publication Date: 2019-10-29
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a lithium battery negative pole and a lithium battery

Method used

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  • Lithium battery negative electrode and lithium battery
  • Lithium battery negative electrode and lithium battery

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preparation example Construction

[0019] The first aspect of the present invention provides a lithium battery negative electrode, the negative electrode includes an adjacent porous film layer and a lithium battery negative electrode material layer, relative to a lithium battery negative electrode material layer with a thickness of 100 μm, the thickness of the porous film layer is 10- 200 μm, wherein, the preparation method of the porous film layer includes: molding the porous material powder and the binder, wherein the specific surface area of ​​the porous material powder is 10-3000m 2 / g, the pore volume is 0.01-3cm 3 / g, with a nanopore distribution with a pore size of 1-100 nm.

[0020] The present invention uses porous materials to prepare a porous thin film layer, which is placed between the negative electrode material layer and the diaphragm of the lithium battery. The nanoscale pore structure of the porous material can be used to regulate the diffusion process of lithium ions, so that they can evenly re...

Embodiment approach

[0025] According to a preferred embodiment of the present invention, the specific surface area of ​​the porous material powder is 50-2000m 2 / g, preferably 200-1500m 2 / g, more preferably 300-900m 2 / g.

[0026] According to a preferred embodiment of the present invention, the pore volume of the porous material powder is 1-3 cm 3 / g, preferably 1.2-1.8cm 3 / g.

[0027] According to a preferred embodiment of the present invention, the porous material powder has a nanopore distribution with a pore diameter of 2-50 nm, preferably a nanopore distribution with a pore diameter of 2-20 nm.

[0028] The specific surface area, pore volume and pore diameter of the porous material powder in the present invention can be measured by BET method.

[0029] The particle size of the porous material powder in the present invention may be 10 nm-50 μm, preferably 20 nm-20 μm. The particle size of the porous material powder can be measured by particle size distribution.

[0030] According to...

Embodiment 1

[0048] It will have a pore size of 2-5nm and a specific surface area of ​​900m 2 / g, the pore volume is 1.2cm 3 g, particle size is 5 μ m of activated carbon (commercially purchased from Nanjing Xianfeng Nano Co., Ltd., the brand is the product of CMK-3), the mass fraction is 60% polytetrafluoroethylene emulsion (PTFE, commercially purchased from Sigma company) and water Mixing, the mass ratio of activated carbon to PTFE is 9:1, and the mass ratio of water: (activated carbon + PTFE) is 20:1. The first film with a thickness of 50 μm was rolled on a rolling machine; the first film was dried at 100° C. for 12 hours, and then stamped to obtain a porous film (with a thickness of 40 μm). The porous film is used as the porous film layer, placed between the lithium sheet (thickness: 100 μm) and the separator (Celgard2325) as the negative electrode material layer of the lithium battery, and the positive electrode is the lithium sheet; with 1M LiPF 6 The EC / DEC solution is used as the...

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Abstract

The invention relates to the field of a lithium battery, and discloses a lithium battery negative electrode and the lithium battery. The negative electrode includes a porous film layer and a lithium battery negative electrode material layer which are adjacent to each other, the thickness of the porous film layer is 10-200 [mu]m with respect to the lithium battery negative electrode material layerhaving the thickness of 100 [mu]m, wherein, a preparation method for the porous film layer includes the following steps: porous material powder and a binder are formed into a shape, wherein, the specific surface area of the porous material powder is 10-3000 m<2> / g, the pore volume is 0.01-3 cm<3> / g, and the porous material powder is provided with nanopore distribution having the pore diameter of 1-100 nm. The lithium battery negative electrode provided by the invention can effectively avoid growth of lithium dendrites, and has long cycle life. In addition, the lithium battery negative electrode provided by the invention does not require an additional current collector, and prevents mass of a battery from increasing caused by the weight of the additional current collector, thereby enablingthe energy density to be decreased.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium battery negative electrode and a lithium battery. Background technique [0002] The lithium metal anode has a theoretical energy density of 3860mAh / g and the lowest electrochemical reduction potential (-3.04V), which is the most potential direction to solve the range anxiety of pure electric vehicles. However, lithium metal tends to form dendrites during the electrochemical cycle, causing part of the metal lithium to fall off, and may penetrate the separator to cause a short circuit of the battery, resulting in a huge safety hazard, which restricts the development of lithium metal batteries. Solving the dendrite problem in the lithium metal anode is a necessary prerequisite for the development of high energy density batteries, such as Li-S batteries, Li-Air batteries and other batteries. [0003] CN104716330A discloses a three-dimensional porous current collector used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/134H01M10/052
CPCH01M4/133H01M4/134H01M10/052Y02E60/10
Inventor 康丹苗唐堃马浩初高准浩康利斌
Owner CHNA ENERGY INVESTMENT CORP LTD
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