Ningde Amperex Technology Limited

Jiali Dong

Yuansen Xie

Jia Tang

Pengyang Feng

Lihong He

Ping He

Liqing Lin

Yajie Zhang

Yuxin Cai

A negative electrode active material having a median particle size Dv50, the negative electrode active material has a median particle size Dv50 after being compressed under a pressure of 1 t, and Dv50/Dv50 is not less than 0.8. The negative electrode active material achieves a balance between high capacity and high cycle expansion performance of an electrochemical device.

Negative electrode active material and electrochemical device and electronic device using the same

An anode including a current collector and an anode active material layer disposed on the current collector are provided. The anode active material layer includes first oriented particles having a first tilt angle θinclined with respect to the direction parallel to the current collector, and second oriented particles having a second tilt angle θinclined with respect to the direction parallel to the current collector. The first tilt angle θand the second tilt angle θare different and both not greater than 70°.

Anode, and electrochemical device comprising the same

An anode including a current collector and an anode active material layer on the current collector are provided. The anode active material layer includes first oriented particles having a first tilt angle θinclined with respect to the direction of the current collector, and second oriented particles having a second tilt angle θinclined with respect to the direction of the current collector. The first tilt angle θand the second tilt angle θare different and both not greater than 70°.

A negative active material includes a carbon material. The carbon material satisfies the following relationship: 6<Gr/K<16, Gr is a graphitization degree of the carbon material, measured by X-ray diffraction; and K is a ratio Id/Ig of a peak intensity Id of the carbon material at a wavenumber of 1250 cmto 1650 cmto a peak intensity Ig of the carbon material at a wavenumber of 1500 cmto 1650 cm, and is measured by using Raman spectroscopy, and K is 0.06 to 0.15.

Negative active material, electrochemical device that uses same, and electronic device

A negative active material includes a carbon material. The carbon material satisfies the following relationship: 6<Gr/K<16, Gr is a graphitization degree of the carbon material, measured by means of X-ray diffraction; and K is a ratio Id/Ig of a peak intensity Id of the carbon material at a wavenumber of 1250 cmto 1650 cmto a peak intensity Ig of the carbon material at a wavenumber of 1500 cmto 1650 cm, and is measured by using Raman spectroscopy, and K is 0.06 to 0.15. The negative active material according to this application can significantly improve an energy density, cycle performance, and rate performance of the electrochemical device.

An anode material having 0.8&#x2264;0.06&#xd7;(Dv50)&#x2212;2.5&#xd7;Dv50+Dv99&#x2264;12 (1); and 1.2&#x2264;0.2&#xd7;Dv50&#x2212;0.006&#xd7;(Dv50)+BET&#x2264;5 (2), where Dv50 represents a value in the volume-based particle size distribution of the anode material that is greater than the particle size of 50% of the particles, Dv99 represents a value in the volume-based particle size distribution of the anode material that is greater than the particle size of 99% of the particles, and BET is a specific surface area of the anode material, wherein Dv50 and Dv99 are expressed in &#x3bc;m and BET is expressed in m/g. The anode material is capable of significantly improving the rate performance of electrochemical devices.

Anode material, anode and electrochemical device comprising the anode material

A method of edge sealing for a secondary lithium battery, including: (1) drawing a 3D model of a battery edge of a secondary lithium battery, and inputting it into a 3D printer; (2) positioning the secondary lithium battery in a 3D printing area, and fixing a relative position of the secondary lithium battery in the 3D printing area; (3) stimulating, by the 3D printer, the battery edge according to the 3D model and setting a printing path; (4) adding edge sealing glue in a printing head of the 3D printer, the printing head moves according to the set printing path and meantime performs at least one time of printing, so that printed edge sealing glue covers the battery edge; (5) solidifying the edge sealing glue. The method of edge sealing of this application has broader application, which can be applied to batteries of any shape.

Growing community of inventors

Ningde, China

Jiali Dong