US 11,670,764 B2Granted

Positive electrode, electrode group and nonaqueous electrolyte battery

AssigneeKabushiki Kaisha Toshiba

InventorsHikaru Yoshikawa, Akira Yajima, Yasuaki Murashi, Naoki Nishio, Kazuhiro Namba, Natsuki Nakamura

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Abstract

According to a first embodiment, there is provided a positive electrode including a positive electrode active material-containing layer containing a first active material having a spinel type crystal structure. The positive electrode satisfies the formulas (1) to (3) when combined with a negative electrode including a negative electrode active material-containing layer containing a first active material having a spinel type crystal structure: 0.5≤a1/b1≤1.5 (1); 0.4≤a2/b2≤1.4 (2); and 0.5≤a3/b3≤2.3 (3), where a1 and b1 are a pore volume per 1 g weight, a2 and b2 are a pore specific surface area, and a3 and b3 are a median diameter in pore distribution, for the positive and negative electrode active material-containing layers, respectively.

Claims7

Dependent claims

A positive electrode comprising:

a positive electrode active material-containing layer which contains a positive electrode active material comprising a first positive electrode active material having a spinel type crystal structure, a weight proportion of the first positive electrode active material having a spinel type crystal structure in a weight of the positive electrode active material being 75% by weight or more and 100% by weight or less, the positive electrode satisfying the following formulas (1) to (3) when combined with a negative electrode comprising a negative electrode active material-containing layer which contains a negative electrode active material comprising a first negative electrode active material having a spinel type crystal structure:
0.5≤a1/b1≤1.5 (1);
0.4≤a2/b2≤1.4 (2);
and
0.5≤a3/b3≤2.3 (3),
provided that, in the above formulas (1) to (3),
a1 is a pore volume [mL/g] per 1 g weight of the positive electrode active material-containing layer by mercury intrusion porosimetry;
a2 is a pore specific surface area [m2/g] of the positive electrode active material-containing layer by the mercury intrusion porosimetry;
and a3 is a median diameter [μm] in a pore distribution of the positive electrode active material-containing layer by the mercury intrusion porosimetry;
and
b1 is a pore volume [mL/g] per 1 g weight of the negative electrode active material-containing layer by mercury intrusion porosimetry;
b2 is a pore specific surface area [m2/g] of the negative electrode active material-containing layer by the mercury intrusion porosimetry;
and b3 is a median diameter [μm] in a pore distribution of the negative electrode active material-containing layer by the mercury intrusion porosimetry.

10 more elements

An electrode group comprising:

a positive electrode comprising a positive electrode active material-containing layer which contains a positive electrode active material comprising a first positive electrode active material having a spinel type crystal structure, a weight proportion of the first positive electrode active material having a spinel type crystal structure in a weight of the positive electrode active material being 75% by weight or more and 100% by weight or less;
and
a negative electrode comprising a negative electrode active material-containing layer which contains a negative electrode active material comprising a first negative electrode active material having a spinel type crystal structure, a weight proportion of the first negative electrode active material having a spinel type crystal structure in a weight of the negative electrode active material being 75% by weight or more and 100% by weight or less,
the electrode group satisfying the following formulas (1) to (3):
0.5≤a1/b1≤1.5 (1);
0.4≤a2/b2≤1.4 (2);
and
0.5≤a3/b3≤2.3 (3),
provided that, in the above formulas (1) to (3),
a1 is a pore volume [mL/g] per 1 g weight of the positive electrode active material-containing layer by mercury intrusion porosimetry;
a2 is a pore specific surface area [m2/g] of the positive electrode active material-containing layer by the mercury intrusion porosimetry;
and a3 is a median diameter [μm] in a pore distribution of the positive electrode active material-containing layer by the mercury intrusion porosimetry;
and
b1 is a pore volume [mL/g] per 1 g weight of the negative electrode active material-containing layer by mercury intrusion porosimetry;
b2 is a pore specific surface area [m2/g] of the negative electrode active material-containing layer by the mercury intrusion porosimetry;
and b3 is a median diameter [μm] in a pore distribution of the negative electrode active material-containing layer by the mercury intrusion porosimetry.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/019,777Filed 14 Sep 2020 · continuation
Priority: 4 Apr 2018
Published: US 2020/0411853 A131 Dec 2020
Granted: 6 Jun 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification25 codes

H01M 4/481
Of inorganic oxides or hydroxides: of mercury
H01M 4/505
Of manganese: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/0435
Involving compressing or compaction: rolling or calendering
H01M 4/131
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…