Positive electrode active material for non-aqueous electrolyte secondary battery and method for producing same

Patent metadata

Field	Value
Publication number	US-2023282817-A1
Application number	US-202318133232-A
Country	US
Kind code	A1
Filing date	Apr 11, 2023
Priority date	Mar 31, 2017
Publication date	Sep 7, 2023
Grant date	—

Abstract

This cathode active material for a secondary battery using a non-aqueous electrolyte includes nickel-rich lithium transition-metal oxide, exhibits a hard X-ray photoelectron spectroscopy (HAXPES) peak of 1,560 to 1,565 eV in binding energy from an Al-rich layer, using a photon energy of 6 KeV, and with respect to the mean particle diameter r of the lithium transition-metal oxide particle, the Al concentration is approximately constant within 0.35 r of the center.

First claim

1 . A positive electrode active material for a non-aqueous electrolyte secondary battery, including a nickel-containing lithium transition metal oxide, wherein
a proportion of Ni in the nickel-containing lithium transition metal oxide being not less than 80 mol %, a peak of 1560 to 1565 eV in binding energy from an Al-rich layer exists in hard X-ray photoelectron spectroscopy (HAXPES) at a photon energy of 6 KeV, and when lithium transition metal oxide particles have an average particle diameter of r, an Al concentration is approximately constant within a range of 0.35r from the center: wherein the Al-rich layer contains LiAlO 2 , wherein the Al-rich layer has a thickness of 100 nm or less, and wherein aluminum is dissolved to form a solid solution inside the lithium transition metal oxide particles.

2 . The positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 1 , wherein the Al-rich layer is a mixed body of LiAlO 2 and an oxide containing Li, Ni, Co, and Al.

3 . The positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 1 , wherein the Al concentration of the lithium transition metal oxide particles meets 0.99 < (Al concentration at 0.35r)/(Al concentration at central portion) < 1.01.

4 . The positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 1 , wherein the Al concentration within the range of 0.35r from the center is 3 mol% or more.

Assignees

• Panasonic Holdings Corp
• Sanyo Electric Co

Inventors

• MIZAWA Miki
• Nagata Kaoru
• Maekawa Masanori
• Kinoshita Masahiro

Classifications

• H01M4/364

  as mixtures · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M4/48

  of inorganic oxides or hydroxides · CPC title

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title