Electrolyte and electrochemical apparatus including such electrolyte
AssigneeNingde Amperex Technology Limited
InventorsShaoyun ZHOU, Chao TANG
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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.
Claims20
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.
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.
Dependencies are inferred from the claim text.