# US 2026/0074291 A1 · Electrolyte and electrochemical apparatus including such electrolyte

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- Number: US 2026/0074291 A1
- Document ID: US20260074291A1
- Status: Published application
- Kind: A1
- Application number: 19/389,702
- Filed: 2025-11-14
- Published: 2026-03-12
- Earliest claimed: 2021-03-17
- Assignees: Ningde Amperex Technology Limited
- Applicants: Ningde Amperex Technology Limited
- Inventors: Shaoyun ZHOU; Chao TANG
- Web page: https://patentgrep.com/patent/US20260074291A1

## CPC

- H01M 10/0567: characterised by the additives
- H01M 10/0568: characterised by the solutes
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- 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
- H01M 10/0569: characterised by the solvents
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/028: {Positive electrodes}
- H01M 2300/0025: Organic electrolyte
- H01M 2300/0037: Mixture of solvents
- H01M 2300/004: Three solvents
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An electrolyte including lithium bis(fluorosulfonyl)imide and lithium hexafluorophosphate, where based on a total weight of the electrolyte, a weight percentage of lithium bis(fluorosulfonyl)imide is a %, and a weight percentage of lithium hexafluorophosphate is b %, where 12<a+b<20 and 0.2<a/b<1.5. An electrochemical apparatus using the electrolyte described in this application can achieve high energy density while also ensuring rate performance at room temperature and high temperature and cycling stability at room temperature and high temperature.

## Claims

### Claim 1

An electrochemical apparatus, comprising an electrolyte and a positive electrode; the positive electrode comprises a positive electrode current collector and a positive electrode active material layer provided on at least one surface of the positive electrode current collector, the positive electrode active material layer comprises a positive electrode active material;
wherein the electrolyte comprises lithium bis(fluorosulfonyl)imide and lithium hexafluorophosphate;
based on a total weight of the electrolyte, a weight percentage of lithium bis(fluorosulfonyl)imide is a %, and a weight percentage of lithium hexafluorophosphate is b %, 12<a+b<20 and 0.2<a/b<1.5;
and the electrolyte comprises a first compound; wherein the first compound comprises diethyl carbonate; based on the total weight of the electrolyte, a weight percentage of the first compound is c %, wherein c<10; and
the electrolyte comprises a difluorophosphate salt; wherein the difluorophosphate salt comprises at least one of lithium difluorophosphate or lithium difluorooxalate phosphate; based on the total weight of the electrolyte, a weight percentage of the difluorophosphate salt is i %, wherein i<1.5.

### Claim 2 (depends on 1)

The electrochemical apparatus according to claim 1, wherein a and b satisfy at least one of condition (1) or condition (2):
2
<
a
<
11
;
or
(
1
)
4.8
<
b
<
14.
(
2
)

### Claim 3 (depends on 1)

The electrochemical apparatus according to claim 1, the electrolyte further comprises dimethyl carbonate; wherein based on the total weight of the electrolyte, a weight percentage of dimethyl carbonate is d %, wherein 45<d<70.

### Claim 4 (depends on 1)

The electrochemical apparatus according to claim 1, the electrolyte further comprises a second compound; wherein the second compound comprises at least one of ethylene sulfate, 2,4-butane sultone, 5-methyloxathiolane 2,2-dioxide, or 1,3-propane sultone; and based on the total weight of the electrolyte, a weight percentage of the second compound is e %, wherein e≤3.

### Claim 5 (depends on 1)

The electrochemical apparatus according to claim 1, the electrolyte further comprises a third compound; wherein the third compound comprises at least one of vinylene carbonate, vinyl ethylene carbonate, and fluoroethylene carbonate; and based on the total weight of the electrolyte, a weight percentage of the third compound is f %, wherein f<4.

### Claim 6 (depends on 1)

The electrochemical apparatus according to claim 1, the electrolyte further comprises a propynyl compound; wherein the propynyl compound comprises at least one of 2-propyn-1-yl 1H-imidazole-1-carboxylate or 2-propynyl methyl carbonate; and based on the total weight of the electrolyte, a weight percentage of the propynyl compound is g %, wherein g<1.

### Claim 7 (depends on 1)

The electrochemical apparatus according to claim 1, the electrolyte further comprises a boron-containing lithium salt; wherein the boron-containing lithium salt comprises at least one of lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium tetrafluoroborate, or lithium tetraborate; and based on the total weight of the electrolyte, a weight percentage of the boron-containing lithium salt is h %, wherein h<1.

### Claim 8 (depends on 1)

The electrochemical apparatus according to claim 1, wherein the positive electrode active material comprises lithium iron phosphate; based on a total weight of the positive electrode active material, a weight percentage of the lithium iron phosphate is higher than or equal to 70%.

### Claim 9 (depends on 1)

The electrochemical apparatus according to claim 1, wherein the positive electrode active material comprises a nickel-containing material; and based on a total weight of the positive electrode active material, a weight percentage of the nickel-containing material is higher than or equal to 70%.

### Claim 10 (depends on 9)

The electrochemical apparatus according to claim 9, wherein the nickel-containing material comprises Me element; the Me element comprises at least one element of Co, Mn, Al, W, Mg, Ti, Zr, Y, Sr, Cu, F, Si, Na, Fe, Ca, S, or B; and based on the total molar amount of Ni and Me, y is the molar content of Ni, z is the molar content of Me, 0.5≤y≤0.96, 0<z≤0.5.

### Claim 11 (depends on 4, 10)

The electrochemical apparatus according to claim 10, 4<b/y<40.

### Claim 12 (depends on 1)

The electrochemical apparatus according to claim 1, a compacted density of the positive electrode active material layer is j g/cm3, wherein 0.35<a/j<7.5.

### Claim 13 (depends on 1)

The electrochemical apparatus according to claim 1, wherein c≤5.

### Claim 14 (depends on 3)

The electrochemical apparatus according to claim 3, wherein 50<d<65.

### Claim 15 (depends on 4)

The electrochemical apparatus according to claim 4, wherein e≤2.

### Claim 16 (depends on 5)

The electrochemical apparatus according to claim 5, wherein f≤3.

### Claim 17 (depends on 5)

The electrochemical apparatus according to claim 5, wherein the electrolyte further comprises a second compound; wherein the second compound comprises at least one of ethylene sulfate, 2,4-butane sultone, 5-methyloxathiolane 2,2-dioxide, or 1,3-propane sultone; and based on the total weight of the electrolyte, a weight percentage of the second compound is e %, and e≤3, 0.3≤e+f≤6.

### Claim 18 (depends on 7)

The electrochemical apparatus according to claim 7, wherein h≤0.6.

### Claim 19 (depends on 1)

The electrochemical apparatus according to claim 1, wherein i≤1.2.

### Claim 20

An electrochemical apparatus, comprising an electrolyte and a positive electrode; the positive electrode comprises a positive electrode current collector and a positive electrode active material layer provided on at least one surface of the positive electrode current collector, the positive electrode active material layer comprises a positive electrode active material;
wherein the electrolyte comprises lithium bis(fluorosulfonyl)imide and lithium hexafluorophosphate;
based on a total weight of the electrolyte, a weight percentage of lithium bis(fluorosulfonyl)imide is a %, and a weight percentage of lithium hexafluorophosphate is b %, 12<a+b<20 and 0.2<a/b<1.5;
and the electrolyte comprises a first compound; wherein the first compound comprises diethyl carbonate; based on the total weight of the electrolyte, a weight percentage of the first compound is c %, wherein c<10; and
the electrolyte comprises a second compound; wherein the second compound comprises at least one of ethylene sulfate, 2,4-butane sultone, 5-methyloxathiolane 2,2-dioxide, or 1,3-propane sultone; and based on the total weight of the electrolyte, a weight percentage of the second compound is e %, wherein e≤3.