Anode material for lithium ion secondary battery

Details Anode material for lithium ion secondary battery Anode material for lithium ion secondary battery

2003-01-24

2010-10-19

Yuan, Dah-Wei D (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

C429S231950, C429S218100

Reexamination Certificate

active

07816037

ABSTRACT:
The invention provides an anode material for lithium ion secondary battery using a coated graphite powder as a raw material, which is coated thermoplastic resin of a carbonization yield of ≦20 wt % in a proportion of ≦10 parts by weight the carbonized material per 100 parts by weight graphite powder. Coating with thermoplastic resin increases the accumulative pore volume by ≦5%, relative to the uncoated powder, and results in pore sizes of 0.012-40 μm via mercury porosimeter method. Calculated with the BJH method as viewed from desorption isotherm, the coated graphite powder has a mesopore volume ≦0.01 cc/g or ≦60% of the pore volume of the uncoated graphite powder. This coated powder also has an average particle size ranging from 10-50 μm measured by a laser-scattering-particle-size-distribution measuring device, and a standard deviation to the average particle size (σ/D) ratio of ≦0.02.

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