Nonaqueous electrolyte battery and battery pack

A non-aqueous electrolyte and battery technology, applied in the direction of non-aqueous electrolyte batteries, electrolytes, battery electrodes, etc., can solve problems such as battery performance degradation

Active Publication Date: 2020-05-15
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, lithium manganate is subject to degradation of battery performance due to manganese dissolution and gas generation in high-temperature environments.

Method used

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  • Nonaqueous electrolyte battery and battery pack
  • Nonaqueous electrolyte battery and battery pack
  • Nonaqueous electrolyte battery and battery pack

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0026] According to the first embodiment, a nonaqueous electrolyte battery is provided. The nonaqueous electrolyte battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode has a positive electrode active material-containing layer. The positive electrode active material-containing layer contains lithium-manganese composite oxide particles and lithium-cobalt composite oxide particles having a spinel crystal structure. The negative electrode contains titanium-containing oxides. The nonaqueous electrolyte contains propionate. The non-aqueous electrolyte battery satisfies the following formulas: 0.8≤p / n≤1.2 and 1≤w / s≤60. p is the capacity per unit area of ​​the positive electrode [mAh / cm 2 ]. n is the capacity per unit area of ​​the negative electrode [mAh / cm 2 ]. w is the content of propionate in the non-aqueous electrolyte, and is in the range of 10% by weight or more and 60% by weight or less. s is the average part...

no. 2 Embodiment approach

[0156] According to a second embodiment, a battery pack is provided. This battery pack includes the nonaqueous electrolyte battery according to the first embodiment.

[0157] The battery pack according to the second embodiment may further include a plurality of non-aqueous electrolyte batteries. A plurality of nonaqueous electrolyte batteries can be electrically connected in series, or can be electrically connected in parallel. Alternatively, a plurality of non-aqueous electrolyte batteries can also be connected in series and in parallel in combination.

[0158] For example, the battery pack according to the second embodiment may further include five first non-aqueous electrolyte batteries. These nonaqueous electrolyte batteries can be connected in series, for example.

[0159] In addition, the connected non-aqueous electrolyte cells can constitute a battery pack. That is, the battery pack according to the second embodiment may further include assembled batteries.

[0160...

Embodiment 1

[0180] In Example 1, a nonaqueous electrolyte battery was fabricated through the following procedure.

[0181] [making of positive electrode]

[0182] As the positive electrode active material, a commercially available aluminum-containing lithium-manganese composite oxide (LiAl 0.25 mn 1.75 o 4 ) particles and lithium cobalt oxide (LiCoO 2 )particle of. The aluminum-containing lithium-manganese composite oxide particles are a mixture including primary particles and secondary particles formed by agglomerating the primary particles. The average particle size s of the aluminum-containing lithium-manganese composite oxide particles was 5 μm. In addition, lithium cobaltate particles are primary particles. The average primary particle size t of the lithium cobaltate particles was 8 μm. These were mixed so that the weight ratio of aluminum-containing lithium-manganese composite oxide:lithium cobaltate was 92:8, and it was used as a positive electrode active material.

[0183]...

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Abstract

According to one embodiment, a nonaqueous electrolyte battery is provided and the nonaqueous electrolyte battery comprises a positive electrode, a negative electrode, and a nonaqueous electrolyte. Thepositive electrode includes a layer containing a positive electrode active substance, the layer containing the positive electrode active substance contains lithium-manganese compound oxide particleshaving a spinel-type crystal structure and the lithium-cobalt compound oxide particles, and the negative electrode contains a titanium-containing oxide. The nonaqueous electrolyte contains a propionicacid ester and satisfies the formulas 0.8 <= p / n < =1.2 and 1< =w / s <= 60, wherein p is the capacity per unit surface area [mAh / cm2] of the positive electrode; n is the capacity per unit surface area[mAh / cm2] of the negative electrode; w is the propionic acid ester content of the nonaqueous electrolyte and is within a range of 10 to 60 wt%; and s is the average particle diameter [Mu m] of the lithium-manganese compound oxide particles.

Description

technical field [0001] Embodiments of the present invention relate to a nonaqueous electrolyte battery and a battery pack. Background technique [0002] Lithium ion secondary batteries that perform charge and discharge by moving lithium ions between the positive electrode and the negative electrode have the advantage of being able to obtain high energy density and high output. Lithium-ion secondary batteries take advantage of these advantages and are used in a wide range of applications from small applications such as portable electronic devices to large-scale applications such as electric vehicles and power supply and demand adjustment systems. [0003] A non-aqueous electrolyte battery using a lithium-titanium composite oxide having a lithium intercalation and deintercalation potential as high as about 1.55 V based on a lithium electrode instead of a carbon material is also put into practical use as a negative electrode active material. Lithium-titanium composite oxides h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M4/36H01M4/485H01M4/505H01M4/525H01M10/052
CPCH01M4/485H01M4/505H01M4/525H01M10/0569Y02E60/10H01M4/131H01M4/364H01M10/0525H01M2300/0037H01M2010/4292H01M2004/021H01M2004/027H01M2004/028H01M50/20
Inventor 原谅山本大保科圭吾
Owner KK TOSHIBA
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