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All solid polymer battery

A body-shaped polymer and polymer technology, applied in the direction of batteries with solid electrolytes, secondary batteries, battery electrodes, etc., can solve the problems of insufficient prevention of battery capacity reduction, increase in internal resistance, and insufficient cycle characteristics. It achieves the effects of excellent ion conductivity, difficulty in reducing battery capacity, and suppressing the increase in interface resistance

Inactive Publication Date: 2009-12-02
PANASONIC CORP
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Problems solved by technology

[0015] The negative electrodes of Patent Documents 4 and 5 are effective for electrolyte-type batteries, but if used in all-solid-state polymer batteries, the internal resistance before and after charge and discharge increases, and the decrease in battery capacity cannot be sufficiently prevented
In addition, when the all-solid-state polymer battery including the negative electrode of Patent Document 4 or 5 is converted into a secondary battery, the cycle characteristics become insufficient.

Method used

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Examples

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preparation example Construction

[0107] In the preparation process of the polymer electrolyte solution, a lithium salt is added to the organic solvent solution of the matrix polymer to prepare the polymer electrolyte solution. Here, the organic solvent is not particularly limited as long as it can dissolve the matrix polymer and is inactive with respect to the matrix polymer and the lithium salt, and known organic solvents can be used. Examples include nitriles such as acetonitrile.

[0108] In the step of forming a precursor membrane, the polymer electrolyte solution obtained in the previous step is applied to a substrate having a smooth surface and dried to form a precursor of a dry polymer electrolyte membrane. This step can be performed in the same manner as conventional polymer electrolyte membrane formation. As a drying method, vacuum drying is preferable. In addition, if a battery electrode is used as a base material, and a precursor of a dry polymer electrolyte membrane is formed on the surface of t...

no. 1 approach

[0139] The all-solid-state polymer battery of the present invention is equipped with the negative electrode active material selected from the first embodiment of the present invention, the dry polymer electrolyte of the second embodiment of the present invention, and the amorphous material in the negative electrode interface of the third embodiment of the present invention. It has the same configuration as the conventional all-solid-state polymer battery, except that it is one or more than one of the groups constituted by the arrangement of the solid lithium nitride layer. Preferably, any one of the first embodiment of the present invention, the second embodiment of the present invention, and the third embodiment of the present invention is provided.

[0140] figure 2 It is a vertical cross-sectional view schematically showing the configuration of the all-solid-state polymer battery 10 of the present invention. All solid polymer battery 10 includes negative electrode 11 , po...

Embodiment 1 and comparative example 1

[0182] (1) Production of negative electrode active material and production of negative electrodes 1 to 14 and comparative negative electrodes 1 to 3

[0183] In an argon atmosphere, a lithium-based active material foil having a thickness of 300 μm was produced by an extrusion molding machine, and heated to 200° C. to melt it. The lithium-based active material in a molten state was placed on a heated copper foil having a thickness of 20 μm, and the copper foil was cooled to room temperature at the cooling rate described in Table 1.

[0184] Next, after a guide (10 mm in diameter) of a predetermined size is placed on the surface of the copper foil on which the lithium-based active material is provided, the lithium-based active material is pressed and rolled to a thickness of about 100 μm, and is aligned with the guide. The same size, and crimped to the copper foil as the negative electrode current collector. The lithium-based active material foil obtained by rolling was heated ...

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Abstract

This invention provides an all solid polymer battery comprising 1) a lithium negative electrode active material containing crystal grains and crystal grain boundaries, at least a part of the crystal grain boundaries being exposed on the lithium negative electrode active material, the exposed area of the crystal grain boundaries being 0.02 to 0.5 cm per cm of the surface, 2) a dry polymer electrolyte containing a specific ethylene glycol ether, a polymer containing an electron donating oxygen atom in its skeleton and a lithium salt, or 3) a noncrystalline lithium nitride layer provided between a negative electrode and a polymer electrolyte. This constitution can provide an all solid polymer battery which can realize reduced resistance of the interface of the negative electrode and the polymer electrolyte and has a high capacitance and excellent cycle properties. Further, the all solid polymer battery can realize the suppression of an increase in internal resistance during storage and is excellent in high rate discharge properties after storage.

Description

technical field [0001] The present invention relates to an all solid polymer battery. More specifically, the present invention mainly relates to the improvement of the negative electrode active material in the all-solid-state polymer battery, the improvement of the dry polymer electrolyte and the improvement of the structure of the electrode group. Background technique [0002] Nonaqueous electrolyte batteries are roughly classified into electrolytic solution type batteries and solid type batteries. The electrolyte type battery is a battery in which an electrolyte solution is interposed between a positive electrode and a negative electrode. The electrolytic solution type battery has a high battery capacity, but requires a precise structure to prevent the electrolytic solution from leaking out of the battery, that is, so-called leakage. A solid-state battery is a battery obtained by interposing a solid electrolyte between a positive electrode and a negative electrode. Sinc...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M6/18H01M4/02H01M4/06H01M4/134H01M4/38H01M4/40H01M10/052H01M10/0565
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 植田智博
Owner PANASONIC CORP
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