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Non-aqueous electrolyte battery, battery pack, and vehicle

A non-aqueous electrolyte, battery pack technology, applied in battery/battery traction, battery electrodes, battery circuit devices, etc., can solve problems such as swelling, increase in negative electrode internal resistance, and decrease in high temperature cycle performance

Active Publication Date: 2020-09-22
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fluorine-based resins or modified products thereof tend to swell in non-aqueous electrolytes at high temperatures
Therefore, in a battery having a negative electrode containing a fluorine-based resin or a modified product thereof as a binder, there is a possibility that the high-temperature cycle performance may decrease.
Specifically, in a battery using such a fluorine-based resin or the like as a binder for the negative electrode, the electron-conducting network of the negative electrode is cut off during the charge-discharge cycle at high temperature, and as a result, the internal resistance of the negative electrode increases.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0045] 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 negative electrode includes a negative electrode current collector and a negative electrode mixture layer disposed on the negative electrode current collector. The negative electrode mixture layer includes titanium-containing metal oxide particles capable of intercalating and deintercalating lithium ions and a binder containing acrylic resin. The titanium-containing metal oxide particles have a phase of carbonaceous material on at least a portion of the surface. The peel strength α (unit: kN / m) measured by the surface-interface cutting method of the negative electrode current collector and the negative electrode mixture layer and the cutting strength β (unit: kN / m) measured by the surface-interface cutting method in the negative electrode mixture layer The relationship ...

no. 2 Embodiment approach

[0167] According to a second embodiment, a battery pack is provided. This battery pack includes the nonaqueous electrolyte battery of the first embodiment.

[0168] The battery pack of the second embodiment may include one or more nonaqueous electrolyte batteries (single cells) of the first embodiment described above. The plurality of non-aqueous electrolyte batteries that can be included in the battery pack according to the second embodiment can be electrically connected in series, in parallel, or a combination of series and parallel. A plurality of non-aqueous electrolyte batteries can also constitute a battery pack by being electrically connected. The battery pack of the second embodiment may include a plurality of assembled batteries.

[0169] The battery pack of the second embodiment may further include a protection circuit. The protection circuit controls the charge and discharge of the non-aqueous electrolyte battery. Alternatively, a circuit included in a device us...

Embodiment 1

[0191] (production of electrodes)

[0192] First, for the positive electrode, LiMn as the positive active material 2 o 4 Powder: 90% by weight, acetylene black as a conductive agent: 5% by weight and polyvinylidene fluoride (PVdF) as a binder: 5% by weight are added to N-methylpyrrolidone (NMP) and mixed to obtain positive electrode slurry . At a coating speed of 2.0 m / min, the prepared positive electrode slurry was coated on both sides of a current collector formed of an aluminum foil with a thickness of 15 μm, and the slurry coating film was dried at 130° C. to form a positive electrode mixture layer. Then, pressurize the positive electrode mixture layer at 25°C to make an electrode with a density of 2.0 g / cm 3 positive pole.

[0193] Regarding the negative electrode, as the negative electrode active material, Li 4 Ti 5 o 12 Powder: 90% by weight, acetylene black as a conductive agent: 5% by weight and a copolymer of acrylonitrile and acrylic acid as a binder (hereina...

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Abstract

The invention provides a non-aqueous electrolyte battery, a battery pack and a vehicle. The nonaqueous electrolyte battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte. The negative electrode includes a negative electrode current collector and a negative electrode mixture layer disposed on the negative electrode current collector. The negative electrode mixture layer includes titanium-containing metal oxide particles capable of intercalating and deintercalating lithium ions and a binder containing acrylic resin. The titanium-containing metal oxide particles have a phase of carbonaceous material on at least a portion of the surface. The negative electrode satisfies formula (I): α / β>6. Here, α is the peel strength (kN / m) of the current collector and the negative electrode mixture layer measured by the surface-interface cutting method, and β is the cutting strength (kN / m) measured by the surface-interface cutting method in the negative electrode mixture layer .

Description

technical field [0001] Embodiments relate to nonaqueous electrolyte batteries, battery packs, and vehicles. Background technique [0002] In recent years, research and development of non-aqueous electrolyte secondary batteries as high-energy-density batteries have been extensively carried out for non-aqueous electrolyte secondary batteries that perform charge and discharge by moving Li ions between the negative electrode and the positive electrode. So far, there are LiCoO-containing 2 or LiMn 2 o 4 Lithium ion secondary batteries having a positive electrode as an active material and a negative electrode containing a carbonaceous material capable of intercalating and deintercalating lithium have been widely used in portable devices. [0003] Such lithium-ion secondary batteries have been widely used in recent years as electric vehicles (electric vehicles: EVs), hybrid electric vehicles (hybrid electric vehicles: HEVs), plug-in hybrid vehicles (plug-in hybrids) developed fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M50/211H01M50/296
CPCH01M10/0525H01M2220/20H01M50/296H01M50/211H01M4/0404H01M4/131H01M4/625H01M4/622H01M4/366Y02E60/10Y02T10/70B60L50/66H01M4/485H01M50/502H01M50/20H01M10/44H01M10/425
Inventor 山下泰伸五十崎义之石桥充伊势一树高见则雄
Owner KK TOSHIBA