secondary battery with non-aqueous electrolyte

The nonaqueous electrolyte secondary battery addresses the issue of tapered part formation and peeling by using specific oil absorption and density ratios for the positive electrode active material and inorganic filler, ensuring high yield and stable performance.

DE102020207183B4Active Publication Date: 2025-10-02TOYOTA JIDOSHA KK
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Patent Information

Application Number
DE102020207183
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Priority Date
2019-06-11
Filing Date
2020-06-09
Publication Date
2025-10-02
Estimated Expiration
2040-06-09

AI Technical Summary

Technical Problem

The formation of a tapered part at the end of the positive electrode active material layer due to surface tension during simultaneous application of positive electrode and heat-resistant layer slurries leads to reduced battery capacity and peeling of the heat-resistant layer due to stress from expansion and contraction during charging and discharging.

Method used

A nonaqueous electrolyte secondary battery design with a positive electrode active material having a dibutyl phthalate oil absorption of 26.5 ml/100 g to 45.0 ml/100 g and a tapped density ratio of 1.32 to 2.44 with an inorganic filler, limiting mixing at the interface between the positive electrode active material layer and the heat-resistant layer.

Benefits of technology

The design prevents capacity loss and peeling of the heat-resistant layer, enabling high-yield manufacturing and stable performance of the battery.

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Abstract

A non-aqueous electrolyte secondary battery (100) comprising: a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the positive electrode comprises a positive electrode current collector (52), a positive electrode active material layer (54) formed on the positive electrode current collector (52), and a heat-resistant layer (56) formed on the positive electrode current collector (52) and adjacent to the positive electrode active material layer (54), the positive electrode active material layer (54) contains a positive electrode active material, the active material of the positive electrode is porous particles in which primary particles are aggregated and at least two or more pores are formed, the positive electrode active material has a dibutyl phthalate oil absorption of 26.5 ml / 100 g or more and 45.0 ml / 100 g or less, the heat-resistant layer (56) contains an inorganic filler and a ratio of a tamped density of the positive electrode active material to a tamped density of the inorganic filler is 1.32 or more and 2.44 or less.
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