# US 2021/0242466 A1 · Nonaqueous electrolyte secondary battery

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- Number: US 2021/0242466 A1
- Document ID: US20210242466A1
- Status: Published application
- Kind: A1
- Application number: 17/135,156
- Filed: 2020-12-28
- Published: 2021-08-05
- Earliest claimed: 2020-02-05
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Masaki KATO
- Web page: https://patentgrep.com/patent/US20210242466A1

## CPC

- H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors}
- C01B 25/30: Alkali metal phosphates
- H01M 4/136: Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 4/362: {Composites}
- H01M 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C01P 2002/74: by peak-intensities or a ratio thereof only
- C01P 2006/40: Electric properties
- H01M 2004/028: {Positive electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present disclosure provides a technology of eliciting the heat generation suppressing effect of trilithium phosphate (Li3PO4) in a 4 V class battery stably. The nonaqueous electrolyte secondary battery disclosed herein includes a positive electrode having a positive electrode mixture material layer, a negative electrode, and a nonaqueous electrolyte. The positive electrode has a region with an open voltage of 4.25 V (Li/Li+) or less in an operating range of the battery. The positive electrode mixture material layer includes a positive electrode active material, trilithium phosphate (Li3PO4), and lithium dihydrogenphosphate (LiH2PO4). In the nonaqueous electrolyte secondary battery disclosed herein, in an XRD pattern of the positive electrode mixture material layer, a peak intensity IA detected near 27 cm−1, and a peak intensity B detected near 22 cm−1 satisfy 0<IA/IB≤0.03. This prevents decomposition of Li3PO4 and gelation of the positive electrode mixture material layer, and the heat generation suppressing effect by Li3PO4 can be stably elicited.

## Claims

### Claim 1

A nonaqueous electrolyte secondary battery comprising:
a positive electrode having a positive electrode mixture material layer;
a negative electrode; and
a nonaqueous electrolyte, wherein
the positive electrode has a region with an open voltage of 4.25 V (Li/Li+) or less in an operating range of the battery,
the positive electrode mixture material layer includes a positive electrode active material, trilithium phosphate, and lithium dihydrogenphosphate,
in an XRD pattern of the positive electrode mixture material layer, a peak intensity IA detected in the vicinity of 27 cm−1, and a peak intensity IB detected in the vicinity of 22 cm−1 satisfy expression (1) below:
0<IA/IB≤0.03 (1).

### Claim 2 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the IA/IB is 0.008 or more.

### Claim 3 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein a content of the trilithium phosphate is 1 wt % to 15 wt %, with a total solid content mass of the positive electrode mixture material layer being 100 wt %.