US 12,700,618 B1Granted

Electrolytes for lithium-ion battery cells with volume-changing anode particles

AssigneeSila Nanotechnologies, Inc.

InventorsKostiantyn Turcheniuk, William Gent, Gleb Yushin, Xiujun Yue, Viacheslav Iablokov, Katherine Harry, Natasha Teran, Judith Kim, Fezzeh Pouraghajansarhamami, Mikito Nagata

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Abstract

A lithium-ion battery electrolyte includes LiPF6 and an organic compound composition. The organic compound composition includes (1) vinylene carbonate (VC), (2) fluoroethylene carbonate (FEC), and (3) at least one ester (ES). A mole fraction of the LiPF6 in the electrolyte is approximately c(LiPF6) mol. %. A mole fraction of the VC in the electrolyte is approximately c(VC) mol. %. A mole fraction of the FEC in the electrolyte is approximately c(FEC) mol. %. A mole fraction of the ES in the electrolyte is approximately c(ES) mol. %. In some embodiments, the mole fractions c(LiPF6), c(VC), c(FEC), and c(ES) satisfy the following relations: 8≤c(LiPF6)≤16; 0.5≤c(VC)≤5; 10≤c(FEC)≤26; and 40≤c(ES)≤75.

Claims47

Dependent claims

A lithium-ion battery electrolyte, comprising:

LiPF6;
and
an organic compound composition comprising (1) vinylene carbonate (VC), (2) fluoroethylene carbonate (FEC), and (3) at least one ester (ES);
wherein:
a mole fraction of the LiPF6 in the lithium-ion battery electrolyte is approximately c(LiPF6) mol. %;
a mole fraction of the VC in the lithium-ion battery electrolyte is approximately c(VC) mol. %;
a mole fraction of the FEC in the lithium-ion battery electrolyte is approximately c(FEC) mol. %;
a mole fraction of the ES in the lithium-ion battery electrolyte is approximately c(ES) mol. %;
and
c(LiPF6), c(VC), c(FEC), and c(ES) satisfy Relations A1, A2, A3, and A5:
8≤c(LiPF6)≤16 (Relation A1);
0.5≤c(VC)≤5 (Relation A2);
10≤c(FEC)≤26 (Relation A3);
and
50≤c(ES)≤75 (Relation A5).

12 more elements

Dependencies are inferred from the claim text.