- Patent Title: Cathode active material for lithium-ion secondary battery and preparation method thereof, cathode pole piece for lithium-ion secondary battery, and lithium-ion secondary battery
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Application No.: US14580030Application Date: 2014-12-22
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Publication No.: US10454094B2Publication Date: 2019-10-22
- Inventor: Shengan Xia , Jun Yang , Pinghua Wang
- Applicant: Huawei Technologies Co., Ltd.
- Applicant Address: CN Shenzhen
- Assignee: HUAWEI TECHNOLOGIES CO., LTD.
- Current Assignee: HUAWEI TECHNOLOGIES CO., LTD.
- Current Assignee Address: CN Shenzhen
- Agent James Anderson Harrison
- Priority: CN201310323018 20130729
- Main IPC: H01M4/04
- IPC: H01M4/04 ; H01M4/134 ; H01M4/38 ; H01M4/62 ; H01M4/133 ; H01M4/1393 ; H01M4/1395 ; H01M4/36 ; H01M4/583 ; H01M4/587

Abstract:
Embodiments of the present invention provide a cathode active material for a lithium-ion secondary battery, where the cathode active material for a lithium-ion secondary battery includes a silicon-based active substance and a nitrogen-doped carbon material. The silicon-based active substance is encased in the interior of the nitrogen-doped carbon material, and the silicon-based active substance is one or more of a nanoparticle and a nanowire; a micropore is arranged on at least one of the exterior and the interior of the nitrogen-doped carbon material; and a material of the nitrogen-doped carbon material is a nitrogen-doped carbon network. The cathode active material for a lithium-ion secondary battery solves a problem in the prior art that a silicon material, when used as a cathode active material, easily falls from a current collector due to a great volume change and has a low conductivity.
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