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1. (WO2018030002) LITHIUM ION BATTERY ELECTRODE AND LITHIUM ION BATTERY

Pub. No.:    WO/2018/030002    International Application No.:    PCT/JP2017/023217
Publication Date: Fri Feb 16 00:59:59 CET 2018 International Filing Date: Sat Jun 24 01:59:59 CEST 2017
IPC: H01M 4/13
H01M 4/133
H01M 4/62
Applicants: NEC ENERGY DEVICES, LTD.
NECエナジーデバイス株式会社
Inventors: KONO Yasutaka
河野 安孝
Title: LITHIUM ION BATTERY ELECTRODE AND LITHIUM ION BATTERY
Abstract:
The purpose of the present invention is to provide a lithium ion battery electrode that can realize a lithium ion battery having excellent cycle characteristics while suppressing the precipitation of lithium at the electrode even at a high electrode density. The lithium ion battery electrode (100) according to the present invention is provided with: a current collector layer (101); and a negative electrode active material layer (103) disposed on at least one surface of the current collector layer (101) and containing a negative electrode active material, an aqueous binder resin, a thickener, and a conduction auxiliary, the lithium ion battery electrode (100) being a high-density type in which the density of the negative electrode active material layer (103) is at least 1.55 g/cm3, wherein the time for electrolyte solution permeation into the electrode, as measured by the following method 1, is 10 to 55 seconds. (Method 1: 5 μL of an electrolyte solution, prepared by dissolving LiPF6 as an electrolyte at a concentration of 1.0 mol/L in a mixed solvent of ethylene carbonate and diethyl carbonate (ethylene carbonate : diethyl carbonate = 3 : 7 (volume ratio)), is dropped in a 25°C temperature environment onto the surface of the negative electrode active material layer (103) of the lithium ion battery electrode (100) on the side opposite to the current collector layer (101) side, the electrolyte solution being dropped from a position 0.5 cm in the perpendicular direction from said surface of the negative electrode active material layer (103). The time from immediately after the dropping of the electrolyte solution until the droplet of the electrolyte solution is not observed on said surface of the negative electrode active material layer (103) is then measured, and said time is designated as the time for electrolyte solution permeation into the electrode.)