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Electrolytes for a metal-ion battery cell with high-capacity, micron-scale, volume-changing anode particles

專利號(hào)
US11177509B2
公開(kāi)日期
2021-11-16
申請(qǐng)人
Sila Nanotechnologies, Inc.(US CA Alameda)
發(fā)明人
Gleb Yushin; Ashleigh Ward
IPC分類
H01M10/0569; H01M4/525; H01M4/505; H01M10/0568; H01M10/0525; H01M4/38
技術(shù)領(lǐng)域
elr,vol,in,li,lmp,about,solvent,anode,fec,solvents
地域: CA CA Alameda

摘要

In an embodiment, a metal-ion battery cell comprises an anode electrode, a cathode electrode, a separator, and electrolyte ionically coupling the anode electrode and the cathode electrode. The anode electrode is a high-capacity electrode (e.g., in the range of about 2 mAh/cm2 to about 10 mAh/cm2) and the cathode electrode comprises an intercalation-type active material including at least Li, one or more metals, and oxygen. The electrolyte includes a solvent composition having low-melting point (LMP) solvent(s) in the range from about 10 vol. % to about 95 vol. % of the solvent composition.

說(shuō)明書

One or more embodiments of the present disclosure are thereby directed to electrolyte compositions that work well for a combination of high voltage intercalation cathodes (cathodes with the highest charging potential in the range from about 4.2 V to about 4.5 V vs. Li/Li+ and, in some cases, from about 4.5 V vs. Li/Li+ to about 5.1 V vs. Li/Li+) with a sub-class of high-capacity moderate volume changing anodes (e.g., anodes comprising (nano)composite anode powders, which exhibit moderately high volume changes (e.g., about 8-about 160 or about 180 vol. %) during the first charge-discharge cycle, moderate volume changes (e.g., about 4-about 50 vol. %) during the subsequent charge-discharge cycles, an average size (e.g., average diameter) in the range from around 0.2 to around 40 microns and specific surface area in the range from around 0.5 to around 50 m2/g normalized by the mass of the active electrode particles and, in the case of Si-comprising anodes, specific capacities in the range from around 550 to around 2200 mAh/g or 2700 mAh/g (when normalized by the total mass of the composite anode particles, conductive additives and binders) or in the range from around 650 to around 2200 mAh/g or around 2900 mAh/g (when normalized by the mass of the composite anode particles only)). In at least one embodiment, a particular electrolyte composition may be selected based on the value of the highest cathode charge potential.

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