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Bipolar current collecting body and bipolar solid-state lithium secondary battery assembled by bipolar current collecting body

A secondary battery, bipolar technology, used in secondary batteries, electrode carriers/current collectors, battery electrodes, etc., can solve the problems of large mass per unit area, unstable lithium, affecting the specific energy density of batteries, etc. The effect of energy density

Inactive Publication Date: 2018-06-01
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest difficulty of bipolar current collectors lies in the need to meet the conditions of maintaining high electronic conductivity and ionic conductivity insulation while being stable to metal lithium negative electrodes at low voltages and stable to positive electrode materials at high voltages. Harsh service conditions limit the development and application of bipolar current collectors
[0004] A bipolar battery is also mentioned in the invention patent with the publication number CN101076915B. The material of the bipolar current collector used in the embodiment is stainless steel foil, and its mass per unit area is very large, which will affect the specific energy density of the battery.
Although it is also mentioned that thermoplastic polymers and metal powders can be combined to prepare current collectors, most of these metals can react with lithium to form alloys, and the electrochemical stability of metal lithium is poor.
Moreover, the gel electrolyte used in the invention contains a certain amount of organic solvents, which cannot completely avoid the occurrence of liquid-connected short circuits in actual batteries.
In addition, in the invention with the application number CN200910101378, a polymer coated conductive film composed of polyurethane resin and carbon black is used, but the aromatic polyurethane material and its composite system in the examples are unstable to lithium, and the patent does not involve Application of polymer-carbon materials as current collectors for lithium batteries

Method used

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  • Bipolar current collecting body and bipolar solid-state lithium secondary battery assembled by bipolar current collecting body
  • Bipolar current collecting body and bipolar solid-state lithium secondary battery assembled by bipolar current collecting body
  • Bipolar current collecting body and bipolar solid-state lithium secondary battery assembled by bipolar current collecting body

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The assembly of bipolar solid-state lithium secondary batteries includes the preparation of bipolar electrodes, the preparation of solid electrolytes and the assembly of batteries. The specific implementation process is as follows:

[0032] (1) Preparation of polymer-carbon material composite conductive film:

[0033] The polyethylene and carbon black were weighed at a ratio of 85:15, then melted and mixed uniformly, and cast into a film to obtain a composite conductive film with a thickness of 30 μm.

[0034] (2) Preparation of electrodes containing only the positive electrode layer

[0035] The composite conductive film prepared in step (1) is used as a current collector, and the positive electrode slurry is only coated on one side, and the other side is blank.

[0036] The specific manufacturing steps are as follows:

[0037] The cathode material used is lithium iron manganese phosphate (LiFe 0.8 mn 0.2 PO 4 ), the conductive agent used is Super P, the binder is...

Embodiment 2

[0061] The assembly of bipolar solid-state lithium secondary batteries includes the preparation of bipolar electrodes, the preparation of solid electrolytes and the assembly of batteries. The specific implementation process is as follows:

[0062] (1) Preparation of polymer-carbon material composite conductive film:

[0063] The polypropylene and carbon black are weighed according to the ratio of 85:15, then melted and mixed uniformly, and cast into a film to obtain a composite conductive film.

[0064] Steps (2)-(5) refer to steps (2)-(5) of Example 1.

[0065] (6) Assembly of bipolar solid-state lithium secondary battery:

[0066] a The solid electrolyte membrane prepared by step (5) is pressed on the positive electrode side of the electrode that only contains the positive electrode layer prepared in step (2), and the pressure used is 8MPa;

[0067] B then pressing the bipolar electrode negative electrode side that step (4) is made on the electrolyte layer;

[0068] c the...

Embodiment 3

[0071] The steps and conditions refer to Example 2, the difference is that the inorganic component of the solid electrolyte is replaced by LATP from LAGP.

[0072] The electrochemical properties of its test results are as follows: image 3 shown.

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Abstract

The invention belongs to the field of a chemical power supply, and particularly relates to a bipolar current collecting body and a bipolar solid-state lithium secondary battery assembled by the bipolar current collecting body. The bipolar current collecting body is prepared from polymers and carbon materials, wherein the polymer materials are polyethylene, polypropylene, polystyrene or polycarbonate resin; the used carbon materials are carbon black, carbon nanometer tubes or Super P. The bipolar solid-state lithium secondary battery is formed by alternating overlapping a solid-state electrolyte membrane for lithium battery and a bipolar electrode comprising the bipolar current collecting body. A polymer-carbon material compound conductive film is used as the bipolar current collecting body; the large-area preparation and the thickness regulation and control are easy; the polymer and the carbon material are low-density materials; under the condition of the same thickness, the mass is lighter than that of metal aluminum and metal copper; the prepared battery has higher energy density; in addition, the voltage of the bipolar solid-state lithium secondary battery can be regulated and controlled through regulating the overlapping layer assembly layer number according to requirements; the space of a battery pile can be further optimized; the total mass is reduced.

Description

technical field [0001] The invention belongs to the field of chemical power sources, in particular to a bipolar current collector and a bipolar solid lithium secondary battery assembled therefrom. Background technique [0002] Lithium-ion batteries have high energy density and power density, making them the first choice for automotive power batteries. However, the current commercial lithium-ion batteries use flammable and volatile organic liquid electrolytes as the ion-conducting medium, which makes lithium-ion batteries have serious safety hazards. When the battery is abused, it is easy to cause accidents such as fire and explosion of the battery. The use of solid electrolytes instead of flammable organic electrolytes is expected to completely solve the safety problem of lithium batteries. [0003] In order to ensure the maximum output power of the battery, the power battery stack needs to connect multiple battery cells in series. However, the small area of ​​the connecti...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/05H01M10/0525
CPCH01M4/663H01M10/05H01M10/0525Y02E60/10
Inventor 钟海麦耀华
Owner JINAN UNIVERSITY
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