US 9,231,244 B2 · Positive electrode active material for lithium ion battery, method of producing the same, electrode for lithium ion battery, and lithium ion battery

Abstract

Provided is a positive electrode active material for lithium ion batteries, which is capable of realizing stability and safety at a high voltage, a high energy density, high load characteristics, and long-term cycle characteristics by controlling a crystal shape of LiMnPO4 particles having a crystal structure very suitable for Li diffusion or controlling an average primary particle size, a production method thereof, an electrode for lithium ion batteries, and a lithium ion battery. The positive electrode active material for lithium ion batteries of the invention is a positive electrode active material for lithium ion batteries, which is formed from LiMnPO4. Values of lattice constants a, b, and c, which are calculated from an X-ray diffraction pattern, satisfy 10.41 Å<a≦10.43 Å, 6.070 Å<b≦6.095 Å, and 4.730 Å<C≦4.745 Å, and an average particle size is 10 to 100 nm.

Claims6

Dependent claims

A positive electrode active material for lithium ion batteries, which is formed from LiMnPO4 particles,

wherein lattice constants a, b, and c, which are calculated from an X-ray diffraction pattern of the LiMnPO4 particles, have values satisfying 10.41 Å<a≦10.43 Å, 6.070 Å<b≦6.086 Å, and 4.730 Å<c≦4.745 Å;
an average particle diameter of the LiMnPO4 particles is 10 to 100 nm,
wherein the LiMnPO4 particles are obtained by a hydrothermal synthesis method, the method comprising:
a step of heating raw material slurry obtained by mixing a Li source, a P source, and a Mn source with a solvent containing water as a main component to a maximum temperature within a range of 100 to 130° C., and performing synthesis under compression at a temperature below or equal to the maximum temperature, and
wherein the maximum temperature of the hydrothermal synthesis is the highest temperature to which the LiMnPO4 particles are heated during the production of the positive electrode active material.

2 more elements

Dependencies are inferred from the claim text.

Positive electrode active material for lithium ion battery, method of producing the same, electrode for lithium ion battery, and lithium ion battery

Life of this patent

Positive electrode active material for lithium ion battery, method of producing the same, electrode for lithium ion battery, and lithium ion battery

Life of this patent

Abstract

Claims6