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Nonaqueous electrolyte battery and battery pack

A non-aqueous electrolyte and battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high temperature cycle life and safety reduction, and achieve the effect of excellent high temperature cycle performance

Active Publication Date: 2015-03-25
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when graphitized material particles are used for the negative electrode and lithium metal oxide including nickel is used for the positive electrode, high-temperature cycle life and safety (especially internal short circuit) are reduced, and therefore, it is difficult to be practically applied to vehicles mounted on Large secondary battery, or fixed large secondary battery

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 approach

[0015] According to the first embodiment, there is provided a non-aqueous electrolyte battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte. Positive electrode includes LiNi x M 1-x O 2 Represents a lithium metal oxide in which M is a metal element including Mn, and x is in the range of 0.5≦x≦1. The negative electrode includes graphitized material particles and layers. The interplanar spacing derived from (002) reflection of the graphitized material particles is 0.337 nm or less according to the X-ray diffraction method. The layer includes titanium-containing oxide. The layer covers at least part of the surface of the graphitized material particles (hereinafter referred to as the covering layer).

[0016] LiNi x M 1-x O 2 The represented lithium metal oxide has high capacity (high energy density) and excellent thermal stability, where M is a metal element including Mn, and x is in the range of 0.5≦x≦1. In addition, the interplanar spacing ...

no. 2 approach

[0092] The battery pack according to the second embodiment includes one or more non-aqueous electrolyte batteries according to the first embodiment. The battery pack may further include a battery module composed of a plurality of batteries. The batteries may be connected in series or in parallel with each other, but are preferably connected in series and n times (n is an integer greater than or equal to 1) of 6 batteries in series.

[0093] image 3 Shown is an embodiment of a battery module for a battery pack. According to the second embodiment, image 3 The battery module 21 shown includes a plurality of rectangular secondary batteries 22 1 -twenty two 5 . Secondary battery 22 1 The positive electrode lead lug 8 is electrically connected to the secondary battery 22 through the lead 23 1 Adjacent secondary battery 22 2 的 negative lead electrode lug 9. In addition, the secondary battery 22 2 The positive electrode lead lug 8 is connected to the secondary battery 22 through the ...

Embodiment 1

[0100] The positive electrode active material uses a layered structure of lithium nickel cobalt manganese oxide (LiNi 0.8 Co 0.1 Mn 0.1 O 2 ), the average particle size of the primary particles in the layered structure is 1 μm. With respect to the entire positive electrode, 5% by weight of the conductive agent acetylene black and 5% by weight of the binder PVdF are added to the mixture. The obtained mixture was dispersed in N-methylpyrrolidone (NMP) solvent to prepare a slurry. Then, the slurry was coated on both sides of a 15μm thick aluminum alloy foil (purity of 99%), and then dried to form a positive electrode material layer with an electrode density of 3.3g / cm by pressing 3 The thickness of each positive electrode material layer is 38μm.

[0101] As the negative electrode active material, according to X-ray diffraction method, (002) crystal plane spacing d 002 Is 0.3358nm, and (I r / I h ) Is 0.1 of artificial graphite powder added to the dissolved Ti(OC 3 H 7 ) 4 In the etha...

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Abstract

According to one embodiment, a nonaqueous electrolyte battery including a positive electrode and a negative electrode is provided. The positive electrode includes LiNixM1-xO2, wherein M is a metal element including Mn, and x is within a range of 0.5<=x<=1. The negative electrode includes graphitized material particles and a layer. The graphitized material particles have an interplanar spacing (002), according to an X-ray diffraction method, of 0.337 nm or less. The layer includes a titanium-containing oxide. The layer covers at least a part of a surface of the graphitized material particles.

Description

Technical field [0001] The embodiments described herein generally relate to a non-aqueous electrolyte battery and battery pack. Background technique [0002] Non-aqueous electrolyte batteries using graphitized materials or carbon materials that absorb and release lithium ions as negative electrodes have been commercialized as mobile device batteries with high energy density. Recently, in order to further increase the energy density of batteries, the practical application of lithium metal oxides including nickel (such as lithium nickel cobalt aluminum oxide or lithium nickel cobalt manganese oxide) as positive electrode active materials has been promoted to replace LiCoO 2 Or LiMn 2 O 4 . [0003] On the other hand, when batteries are installed on vehicles such as cars and trains, in terms of storage performance, cycle performance, long-term reliability and high output in high-temperature atmospheres, the materials constituting the positive electrode and negative electrode are requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/587H01M10/0525H01M2004/021Y02E60/10
Inventor 高见则雄张文稻垣浩贵
Owner KK TOSHIBA
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