公开(公告)号：US20230146274A1

公开(公告)日：2023-05-11

申请号：US17888497

申请日：2022-08-16

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yingjie GUAN ,  Yuzhen ZHAO ,  Qingyan MA ,  Yan WEN ,  Qisen HUANG ,  Fenggang ZHAO

IPC: H01M4/36 ,  H01M4/38 ,  H01M4/587 ,  H01M4/62

CPC classification number: H01M4/364 ,  H01M4/386 ,  H01M4/587 ,  H01M4/622 ,  H01M2004/027

Abstract: The present application provides a silicon carbon negative electrode material, a negative electrode sheet including the same, a secondary battery, a battery module, a battery pack and a power consumption apparatus. A battery composed of a negative electrode prepared by the silicon carbon negative electrode material in the present application as a working electrode, metal lithium as a counter electrode and an electrolyte containing a lithium ion conductive substance may be charged and discharged, and in a case of drawing a relationship graph between a differential value dQ/dV obtained by differentiating a charging and discharging capacity Q by a working electrode potential V and the working electrode potential V, when energizing the negative electrode material in a direction of delithiation, a ratio of a maximum Y of dQ/dV between 400-480 mV to a maximum X of dQ/dV between 200-255 mV may be in a range of 3.5 to 15.

公开(公告)号：US20230163284A1

公开(公告)日：2023-05-25

申请号：US18095582

申请日：2023-01-11

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Yingjie GUAN ,  Yuzhen ZHAO ,  Qingyan MA ,  Yan WEN ,  Qisen HUANG ,  Fenggang ZHAO

IPC: H01M4/38 ,  H01M4/485 ,  H01M4/36 ,  H01M4/04 ,  H01M10/0525

CPC classification number: H01M4/386 ,  H01M4/485 ,  H01M4/366 ,  H01M4/0471 ,  H01M10/0525 ,  H01M2004/021

Abstract: This application provides a modified silicon material with a core-shell structure, a method for preparing a modified silicon material, a negative electrode active material, a negative electrode plate, a secondary battery, a battery module, a battery pack, and an electric apparatus. The modified silicon material with a core-shell structure includes an inner core, a first coating layer that wraps the inner core, and a second coating layer that wraps the first coating layer, where the inner core is elemental silicon and/or a silicon alloy; the first coating layer includes a silicon-oxygen compound; the second coating layer includes lithium fluoride, lithium carbonate, and carbon; and a weight ratio of element lithium to element carbon in the modified silicon material is 6% to 52%. The modified silicon material of this application has high gram capacity and sound conductivity, so that a battery has high first-cycle coulombic efficiency and sound cycling performance.

公开(公告)号：US20230343938A1

公开(公告)日：2023-10-26

申请号：US18342731

申请日：2023-06-27

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Qingyan MA ,  Yuzhen ZHAO ,  Yingjie GUAN ,  Yan WEN ,  Qisen HUANG

IPC: H01M4/36 ,  H01M4/587 ,  H01M4/58 ,  H01M4/62 ,  H01M4/133 ,  H01M4/136 ,  C01B25/45

CPC classification number: H01M4/366 ,  H01M4/587 ,  H01M4/5825 ,  H01M4/621 ,  H01M4/133 ,  H01M4/136 ,  C01B25/45 ,  H01M2004/028

Abstract: A positive electrode active material has a core-shell structure, which includes an inner core and a coating layer coating at least part of the inner core. The inner core has a chemical formula of LiaAxMn1-yByP1-zCzO4-nDn, and the coating layer includes a polymer which includes one or more selected from polysiloxanes with linear structure and polysiloxanes with ring structure.

公开(公告)号：US20230327091A1

公开(公告)日：2023-10-12

申请号：US18337127

申请日：2023-06-19

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Qingyan MA ,  Yingjie GUAN ,  Yuzhen ZHAO ,  Yan WEN ,  Qisen HUANG

IPC: H01M4/36 ,  H01M4/58 ,  C01B25/45

CPC classification number: H01M4/366 ,  H01M4/5825 ,  C01B25/45 ,  C01P2002/52 ,  C01P2006/40 ,  C01P2004/84

Abstract: A positive electrode active material has a core-shell structure including an inner core and a shell coating the inner core. The inner core has a chemical formula of Li1+xMn1−yAyP1−zRzO4. The shell includes a first coating layer coating the inner core, a second coating layer coating the first coating layer, a third coating layer coating the second coating layer, and a fourth coating layer coating the third coating layer.