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Active material, electrode using same, and lithium ion secondary battery

A technology of active materials and secondary batteries, applied in the field of active materials, can solve the problems of low initial charge and discharge efficiency, high irreversible capacity, and reduced battery capacity of positive active materials

Active Publication Date: 2016-11-09
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned Ni-Co-Mn ternary composite oxide or solid solution system material has a high irreversible capacity when it is charged for the first time, so the initial charge and discharge efficiency of the positive electrode active material is low, and the corresponding negative electrode must be used in excess in battery design. And problems such as reduction in battery capacity

Method used

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  • Active material, electrode using same, and lithium ion secondary battery
  • Active material, electrode using same, and lithium ion secondary battery
  • Active material, electrode using same, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] In Example 1, when making the positive electrode, the lithium-nickel composite oxide (Li-nickel composite oxide (Li 1.01 Ni 0.8 co 0.15 Al 0.05 o 2 ), LiVOPO from the orthorhombic system as the second active material 4 Li obtained by detaching lithium 0.4 VOPO 4 , mixed in a mortar and used as a positive electrode active material.

[0091] [making of positive electrode]

[0092] The active material of Example 1, the conductive additive, and the solvent containing the binder were mixed to prepare a coating material for a positive electrode. The positive electrode coating material was applied to a current collector aluminum foil (20 μm in thickness) by a doctor blade method, dried at 100° C., and rolled. Thus, a positive electrode composed of a positive electrode active material layer and a current collector was obtained. Carbon black (manufactured by NEC, DAB50) and graphite were used as the conductive aid. As a solvent containing a binder, N-methyl-2-pyrrolido...

Embodiment 2～6、 comparative example 1、2

[0104] In Examples 2 to 6, Comparative Example 1, and Comparative Example 2, lithium ion secondary batteries were produced in the same manner as in Example 1 except that the ratio δ was changed, and electrical properties were evaluated. The results are shown in Table 1.

[0105] [Table 1]

[0106]

[0107] In Table 1, batteries with a capacity of 180 mAh / g or more and an initial charge-discharge efficiency of 90% or more were evaluated as "A". A battery with a capacity of less than 180 mAh / g or a battery with an initial charge-discharge efficiency of less than 90% was evaluated as "F".

Embodiment 7

[0109] In Example 7, the lithium-nickel composite oxide (Li-nickel composite oxide (Li 1.2 Ni 0.17 co 0.08 mn 0.55 o 2 ), as the second active material, LiVOPO from the orthorhombic LiVOPO 4 Li obtained by breaking away from 0.4 VOPO 4 , mixed in a mortar, and the mixture was used as a positive electrode active material.

[0110] [Determination of electrical properties]

[0111] Next, using the battery of Example 7 produced in the same manner as in Example 1, it was charged at a constant current of 24 mA / g until the end-of-charge voltage became 4.6 V (vs. Li / Li + ), further to 4.6V (vs.Li / Li + ) at a constant voltage until the current value drops to 12mA / g, and measure the initial charging capacity Qc.

[0112] Then, after stopping for 10 minutes, discharge was performed at a constant current of 24 mA / g until the end-of-discharge voltage became 2.0 V (vs. Li / Li + ), measure the initial discharge capacity Qd in the battery.

[0113] The initial charge-discharge effic...

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Abstract

The present invention provides an active material having a high capacity, excellent initial charge and discharge efficiency, and a high average discharge voltage. The active material involved in the present invention is characterized in that: it contains the first active material material and the second active material material, relative to the total molar number of the first active material material (A) and the second active material material (B), the second The ratio (δ) of the active material (B) is 0.4 mol%≤δ≤18 mol% {wherein, δ is δ=[B / (A+B)]×100}.

Description

technical field [0001] The present invention relates to an active material, an electrode using the active material, and a lithium ion secondary battery. Background technique [0002] In recent years, the popularization of various electric vehicles has been expected in order to solve environmental and energy problems. Lithium-ion secondary batteries have been developed exclusively as in-vehicle power supplies such as motor drive power supplies, which are key to the practical application of these electric vehicles. However, as a vehicle power supply, it is necessary to improve the performance of the battery and make it cheaper in order to widely spread the battery. In addition, it is necessary to make the driving distance of electric vehicles close to that of gasoline engine vehicles, and higher energy batteries are desired. [0003] In order to increase the energy density of the battery and constitute a high discharge capacity, it is necessary to increase the amount of elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/36H01M4/505H01M4/58H01M10/052H01M10/0566
CPCH01M4/364H01M4/525H01M4/5825H01M10/0525Y02E60/10H01M4/131
Inventor 加藤友彦佐野笃史苏武正树野岛昭信
Owner TDK CORPARATION
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