Contemporary Amperex Technology (Hong Kong) Limited

Contemporary Amperex Technology Co., Ltd.

Contemporary Amperex Technology Limited

Zeli Wu

Changlong Han

Bin Jiang

Chenghua Fu

Lei Huang

Jie Guo

Cuiping Zhang

Chengdu Liang

Qian Liu

Peipei Chen

Jianfu He

Jingxuan Sun

Liye Li

Huiling Chen

Zhiyong Ai

Qiao Wu

Shuting Peng

Wenhao Liu

The present application provides an electrolytic solution, a secondary battery, and a power consumption apparatus. The electrolytic solution may include a solvent and an additive; the solvent may include a compound of formula I, and a mass percentage of the compound of formula I in the solvent may be 35% or more; in formula I, Rand Rare each independently selected from any one of a hydrogen atom, a C1-C3 chain alkyl group, and a C2-C3 alkenyl group; and the additive may include a compound of formula II, and in formula II, R, R, and Rare each independently selected from any one of a hydrogen atom, a fluorine atom, a phenyl group, a cyano group, a C1-C6 chain alkyl group, a C3-C6 cyclic alkyl group, and a C2-C6 alkenyl group.

Electrolytic solution, secondary battery, and power consumption apparatus

An electrolyte for a secondary battery includes a solvent, a lithium salt, and a film-forming additive. A content of the film-forming additive is 0.1%-10% by mass of a total mass of the electrolyte, and the content of the film-forming additive satisfies: A is a mass percentage of the film-forming additive in the total mass of the electrolyte. B is an electrolyte retention coefficient of the secondary battery, in g/Ah. M is a mass of a positive electrode active material required per unit capacity of the secondary battery, in g/Ah. N is a mass percentage of nickel in the positive electrode active material contained in the secondary battery. and C is a mass percentage of Co in the positive electrode active material contained in the secondary battery.

Electrolyte, secondary battery, battery module, battery pack, and power consuming device

This application provides a non-aqueous electrolyte and a preparation method thereof, and a secondary battery and an electric apparatus containing the same. The non-aqueous electrolyte contains the non-aqueous solvent and lithium ions, first cations, and first anions dissolved therein, where the first cation is a metal cation Meother than the lithium ion, n representing a chemical valence of the metal cation; the first anion is a tetrafluoroborate anion BF; mass concentration of the first cations in the non-aqueous electrolyte is D1 ppm, and mass concentration of the first anions in the non-aqueous electrolyte is D2 ppm, both based on total mass of the non-aqueous electrolyte; and the non-aqueous electrolyte satisfies that D1 is 0.1 to 1250 and that D1/D2 is 0.02 to 2. The non-aqueous electrolyte in this application enables the secondary battery to have good cycling performance, safety performance, and kinetic performance.

Non-aqueous electrolyte and preparation method thereof, and secondary battery and electric apparatus containing same

A battery cell includes an electrolyte, positive and negative electrode plates, and a separator provided between the positive and negative electrode plates. The electrolyte includes a lithium salt including lithium hexafluorophosphate, a mass percentage of which with respect to a total mass of the electrolyte ranges from 15% to 20%. The positive/negative electrode plate includes a positive/negative electrode current collector and a positive/negative electrode film layer provided on at least one side of the positive/negative electrode current collector and containing a positive/negative electrode active material. The negative electrode active material contains carbon and silicon. A mass percentage of silicon with respect to a total mass of the negative electrode active material is greater than or equal to 0.3% and less than or equal to 3.0%.

Battery cell, battery, and electric apparatus

This application provides a secondary battery and an apparatus containing the secondary battery. The secondary battery includes an electrolytic solution. The electrolytic solution includes an electrolyte salt and an organic solvent. The electrolyte salt includes lithium bis(fluorosulfonyl)imide (LiFSI) and lithium hexafluorophosphate (LiPF). A volumetric molar concentration of the LiFSI in the electrolytic solution is 0.8 mol/L-1.2 mol/L; and a volumetric molar concentration of the LiPFin the electrolytic solution is 0.15 mol/L-0.4 mol/L. The organic solvent includes ethylene carbonate (EC), and mass percent of the EC in the organic solvent is less than or equal to 20%.

Secondary battery and apparatus containing the secondary battery

The application provides a secondary battery and a device including the same. The secondary battery includes a negative electrode plate that includes a negative electrode film, where the negative electrode film includes a negative electrode active material; electrolyte that includes an electrolyte salt, an organic solvent and an additive, where the negative electrode active material includes a silicon-based material; the organic solvent includes dimethyl carbonate (DMC); and the additive includes one or more of compound shown in Formula 1 as discloses in the application, where, Ris selected from one of C2˜C4 alkylene or halogenated alkylene, C2˜C4 alkenylene or halogenated alkenylene, C6˜C18 arylene and derivatives thereof. Under the premise of having a high energy density, the secondary battery and the device including the same according to the application can also have good high-temperature cycle performance and high-temperature storage performance.

Secondary battery and device comprising the same

Various embodiments provide an electrolyte solution, a secondary battery, a battery module, a battery pack and an electric device. In those embodiments, the electrolyte solution includes an electrolyte, a solvent and an additive, the additive including sodium hydrosulfite. Various embodiments improve an overall performance of the secondary battery, for example, initial DCR, storage gas production, a rate performance, or the like.

Electrolyte solution, secondary battery, battery module, battery pack and electric device

The present application discloses a lithium-ion battery, which has a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte solution comprising a lithium salt and a solvent, wherein based on the total weight of the electrolyte solution, the percentage by mass of the lithium salt in the electrolyte solution is a %, and the lithium ion battery satisfies 5≤a≤10; and the load on single side of the negative electrode sheet is W grams per 1540.25 mm2, and a and W satisfy 25≤a/W≤50; and the solvent comprises dimethyl carbonate. The lithium ion battery has good safety and high-temperature cycling performance, and also has good kinetic performance.

Lithium-ion battery, battery module, battery pack and powered device

This application provides a secondary battery and a device comprising the same. The secondary battery includes a negative electrode plate and an electrolyte. The negative electrode plate includes a negative electrode active material. The electrolyte includes an electrolyte salt, an organic solvent, and an additive. The negative electrode active material includes a silicon-based material. The organic solvent includes ethylene carbonate (EC) and diethyl carbonate (DEC). A mass ratio of EC in the organic solvent is less than or equal to 20%, and a mass ratio of DEC in the organic solvent is less than or equal to 20%. The additive includes an additive A and an additive B. The additive A is selected from one or more of compounds represented by Formula 1 or Formula 2, and the additive B is selected from one or more of compounds represented by Formula 3, as described in the application.

The present application provides a secondary battery and an apparatus containing the same. The secondary battery includes: a negative electrode plate including a negative electrode current collector and a negative electrode film disposed on at least one surface of the negative electrode current collector, the negative electrode film including a negative active material; and an electrolyte including an electrolyte salt, an organic solvent, and an additive; wherein the negative active material includes a silicon-based material; the additive includes an additive A and an additive B; the additive A is selected from one or more of the compounds shown in Formula 1; the additive B is selected from one or more in the compound shown in Formula 2; the additive B has melting point of below or equal to 5° C.

Secondary battery and apparatus containing the same

A secondary battery, including a positive electrode, a negative electrode, a separator sandwiched between the positive electrode and the negative electrode, and an electrolyte are provided. In some embodiments, the positive electrode includes a positive electrode current collector having two main surfaces, the negative electrode includes a negative electrode current collector having two main surfaces, and at least one of the positive electrode current collector and the negative electrode current collector includes at least one recess structure extending from at least one main surface into interior of the current collector, where the recess structure has a recess depth hin microns, the electrolyte has a conductivity &#x3c3; in Siemens/meter, and numerically, &#x3c3; and hsatisfy the following relationship: 8tanhh0.2&#x2264;&#x3c3;&#x2264;10tanh(h)+2+0.1. This application further provides a battery module including the foregoing secondary battery, a battery pack, and an electric apparatus.

Secondary battery, battery module, battery pack, and electric apparatus

The application provides a secondary battery and a device including the same. The second battery includes: a negative electrode plate, the negative electrode plate including a negative active material; a separation film, the separation film including a base material and a coating arranged on at least one surface of the base material; and an electrolyte, the electrolyte including an organic solvent, where the negative active material includes a silicon-based material and a carbon material; thickness of the base material of the separation film is 7 &#x3bc;m&#x2dc;12 &#x3bc;m; and the organic solvent includes ethylene carbonate, and a weight ratio of the ethylene carbonate in the organic solvent is &#x2264;20%. The secondary battery and the device including the same, which are provided by the application, in the premise of having high energy density, can also have good high-temperature cycle performance, good high-temperature storage performance, and low low-temperature direct current resistance.

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Ningde, China

Zeli Wu