Ningde Amperex Technology Limited

Lilan Zhang

Jianming Zheng

Chao Tang

Junfei Liu

Weihua Zhu

An electrochemical device including a positive electrode, a negative electrode and an electrolyte, wherein the negative electrode comprises a negative electrode active material layer, including a negative electrode active material, wherein the negative electrode active material includes a silicon-containing compound; and the negative electrode active material further includes, on the surface, a protective layer including a compound having an S═O bond.

Electrolyte and electrochemical device

An electrolyte includes diglycolic anhydride and a trinitrile compound, with which the cycle performance and the high-temperature stability under over-discharge conditions of lithium-ion batteries are significantly improved. The electrolyte includes a compound of Formula I; and at least one of a compound of Formula II or a compound of Formula III; R, R, Rand Rare each independently selected from hydrogen, halo, substituted or unsubstituted C-Calkyl, substituted or unsubstituted C-Calkenyl, substituted or unsubstituted C-Calkynyl, substituted or unsubstituted C-Caryl, substituted or unsubstituted C-Calkoxy, or substituted or unsubstituted C-Caryloxy, wherein when substituted, the substituent is halo, cyano, or C-Calkyl; and a, d and f are each independently selected from an integer from 1 to 5, and b, c, e, g, h and i are each independently selected from an integer from 0 to 5.

An electrochemical device, including a positive electrode, a negative electrode, a separator and an electrolyte. The electrolyte includes a nitrile compound, and the mass percentage of the nitrile compound in the electrolyte is A %; the negative electrode includes a current collector, wherein the current collector includes a first region and a second region; the first region is provided with a negative electrode active substance layer; the second region does not include a negative electrode active substance layer; the area of the second region is B % of the surface area of the current collector; and A×B<600.

An electrolyte including one or more nitrile benzoquinone compounds, and the nitrile benzoquinone compound is selected from the group consisting of the compounds represented by formula I, formula II, and formula III: The substituents Rto Rare each independently selected from the group consisting of hydrogen, a Cto Cether group, a Cto Calkoxy group, halogen, a Cto Calkyl group, a Cto Calkenyl group, a Cto Calkynyl group, and a Cto Caryl group. The electrolyte can form a stable protective film on a cathode, thereby increasing the cycle capacity retention rate and high temperature storage performance of an electrochemical device.

Electrolyte, and electrochemical device and electronic device including same

An electrochemical apparatus, including a positive electrode, a negative electrode, an separator, and an electrolyte, wherein the positive electrode comprises a current collector and a positive active material layer, and the positive active material layer comprises a positive active material; and the electrolyte comprises a compound of Formula I:

Electrolyte and electrochemical apparatus

An electrolyte including an imidazolium salt compound and a pyridine compound. The electrolyte, includes a compound of Formula I and a compound of Formula II: where Ris selected from halo, cyano, substituted or unsubstituted C-Calkyl, substituted or unsubstituted C-Calkenyl, substituted or unsubstituted C-Calkynyl, substituted or unsubstituted C-Calkoxy, substituted or unsubstituted C-Ccycloalkyl, and substituted or unsubstituted C-Caryl; and R, R, R, Rand Rare each independently selected from H, halo, cyano, substituted or unsubstituted C-Calkyl, substituted or unsubstituted C-Calkenyl, substituted or unsubstituted C-Calkynyl, substituted or unsubstituted C-Calkoxy, substituted or unsubstituted C-Ccycloalkyl, and substituted or unsubstituted C-Caryl; when substituted, the substituent is halo or cyano. The electrolyte has high stability and can significantly improve the cycle performance and high-temperature storage performance of electrochemical devices.

Electrolyte and electrochemical device using the same

An electrochemical device, including a positive electrode, a negative electrode, a separator and an electrolyte. The electrolyte includes a nitrile compound, and the mass percentage of the nitrile compound in the electrolyte is A %; the negative electrode includes a current collector, wherein the current collector comprises a first region and a second region; the first region is provided with a negative electrode active substance layer; the second region does not comprise a negative electrode active substance layer; the area of the second region is B % of the surface area of the current collector; and A×B<600.

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Ningde, China

Lilan Zhang