Non-aqueous electrolyte battery and battery pack

A non-aqueous electrolyte and battery technology, used in non-aqueous electrolyte batteries, battery electrodes, battery pack components, etc., can solve problems such as the decline of cycle characteristics, and achieve the effect of reducing twisting and excellent charge-discharge cycle performance.

Inactive Publication Date: 2009-04-01
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the volume expands and shrinks with the charge-discharge reaction, the cycle characteristics will decrease due to the twisting of the negative electrode or the separation of the negative electrode from the current collector.

Method used

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  • Non-aqueous electrolyte battery and battery pack
  • Non-aqueous electrolyte battery and battery pack
  • Non-aqueous electrolyte battery and battery pack

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0026] The nonaqueous electrolyte battery of the first embodiment includes a negative electrode, a positive electrode, and a separator interposed between the positive and negative electrodes. An electrode group composed of such a negative electrode, a positive electrode, and a separator is accommodated in an outer packaging material, and at least the electrode group contains a nonaqueous electrolyte. The positive electrode has a positive electrode layer. The negative electrode has a structure in which a negative electrode layer containing a negative electrode active material is formed on the surface of a negative electrode current collector. The negative electrode layer has a structure in which a plurality of layers containing different negative electrode active materials are laminated. Among these stacked layers, the layer in contact with the negative electrode current collector contains spinel-type lithium titanate as the negative electrode active material, and the layer op...

no. 2 approach

[0076] The battery pack of the second embodiment has a plurality of the above-mentioned non-aqueous electrolyte batteries (cells), and the cells are electrically arranged in series or in parallel.

[0077] refer to image 3 and Figure 4 Such a battery pack will be described in detail. For a single cell, you can use figure 1 The flat type battery shown.

[0078] by the above figure 1 A plurality of unit cells 21 composed of the illustrated flat non-aqueous electrolyte battery are stacked so that the negative terminal 6 and the positive terminal 7 protruding outward are aligned in the same direction, and are fastened with an adhesive tape 22 to form a group. battery 23. These cells 21 as Figure 4 shown are electrically connected in series with each other.

[0079] The printed circuit board 24 is disposed so as to face the side surface of the cell 21 from which the negative terminal 6 and the positive terminal 7 protrude. On the printed circuit substrate 24, such as F...

Embodiment 1

[0090] 100 parts by weight of spinel lithium titanate, 7 parts by weight of carbon as a conductive agent, and 2 parts by weight of PVdF as a binder were added to N-methylpyrrolidone (NMP) and mixed to prepare a first slurry. In addition, 100 parts by weight of orthorhombite-type lithium titanate, 7 parts by weight of carbon as a conductive agent, and 2 parts by weight of PVdF as a binder were added to N-methylpyrrolidone (NMP) and mixed to prepare the second material. pulp.

[0091] Next, the above-mentioned first slurry is coated on a current collector made of aluminum foil with a thickness of 15 μm (purity: 99.99%, average crystal particle size: 10 μm), and when the first slurry is in a wet state, apply The above-mentioned second slurry was spread, dried and pressed to prepare a negative electrode having a negative electrode layer with a thickness of 30 μm.

[0092] For the thickness of the layer (containing spinel-type lithium titanate) in contact with the current collecto...

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Abstract

The invention provides a non-aqueous electrolyte battery which reduces the twisting of negative electrode or the peeling of the negative electrode layer from the current collector caused by volume changes on the occasion of charge / discharge reactions and enhancs the charge / discharge cycle characteristics. The non-aqueous electrolyte battery comprises a negative electrode comprising a current collector, and a negative electrode layer formed on one or both surfaces of the current collector, a positive electrode, and a separator interposed between the negative electrode and the positive electrode. The negative electrode layer comprises a plurality of layers laminated each other and containing a different active material each other, the layers comprising a first layer which is contacted with the current collector and contains spinel-type lithium titanate as an active material, and a second layer which is disposed to face the separator and contains Ramsdellite-type lithium titanate or anatase-type titanium oxide as an active material.

Description

technical field [0001] The invention relates to a non-aqueous electrolyte battery and battery assembly. Background technique [0002] A non-aqueous electrolyte battery that utilizes the movement of lithium ions between the negative electrode and the positive electrode to perform charge and discharge is being actively researched and developed as a high energy density battery. [0003] Non-aqueous electrolyte batteries are expected to be used as power sources of large and medium sizes in addition to power sources for small electronic devices. In the use of large and medium-sized power supplies, long life and high durability are required. [0004] The non-aqueous electrolyte battery uses a lithium transition metal composite oxide as a positive electrode active material, and uses a carbonaceous material as a negative electrode active material. Co, Mn, Ni, etc. are used as transition metals. [0005] In recent years, non-aqueous electrolyte batteries using a negative electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M10/40H01M4/02H01M4/58H01M4/48H01M4/131H01M4/485H01M50/209
CPCH01M10/4207H01M4/661H01M2004/027H01M4/364H01M2004/021H01M10/052H01M4/485H01M10/425H01M2/1061Y02T10/7011Y02E60/122H01M4/131Y02E60/10H01M50/209Y02P70/50
Inventor 保科圭吾稻垣浩贵高见则雄
Owner KK TOSHIBA
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