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1. CN114079050 - Silicon-oxygen composite material, preparation method thereof, negative electrode material and lithium ion battery

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Office
China
Application Number 202010898585.9
Application Date 31.08.2020
Publication Number 114079050
Publication Date 22.02.2022
Publication Kind A
IPC
H01M 4/36
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of, or comprising, active material
36Selection of substances as active materials, active masses, active liquids
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4Electrodes
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36Selection of substances as active materials, active masses, active liquids
38of elements or alloys
H01M 4/48
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4Electrodes
02Electrodes composed of, or comprising, active material
36Selection of substances as active materials, active masses, active liquids
48of inorganic oxides or hydroxides
H01M 4/58
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02Electrodes composed of, or comprising, active material
36Selection of substances as active materials, active masses, active liquids
58of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
H01M 4/583
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MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of, or comprising, active material
36Selection of substances as active materials, active masses, active liquids
58of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
583Carbonaceous material, e.g. graphite-intercalation compounds or CFx
H01M 10/0525
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
10Secondary cells; Manufacture thereof
05Accumulators with non-aqueous electrolyte
052Li-accumulators
0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
CPC
H01M 4/366
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4Electrodes
02Electrodes composed of or comprising active material
36Selection of substances as active materials, active masses, active liquids
362Composites
366as layered products
H01M 4/386
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MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of or comprising active material
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38of elements or alloys
386Silicon or alloys based on silicon
H01M 4/483
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01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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48of inorganic oxides or hydroxides
483for non-aqueous cells
H01M 4/5825
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4Electrodes
02Electrodes composed of or comprising active material
36Selection of substances as active materials, active masses, active liquids
58of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
5825Oxygenated metallic slats or polyanionic structures, e.g. borates, phosphates, silicates, olivines
H01M 4/583
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of or comprising active material
36Selection of substances as active materials, active masses, active liquids
58of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
583Carbonaceous material, e.g. graphite-intercalation compounds or CFx
H01M 10/0525
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
10Secondary cells; Manufacture thereof
05Accumulators with non-aqueous electrolyte
052Li-accumulators
0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
Applicants BTR NEW MATERIAL GROUP CO., LTD.
贝特瑞新材料集团股份有限公司
HUIZHOU DINGYUAN NEW ENERGY TECHNOLOGY CO., LTD.
惠州市鼎元新能源科技有限公司
Inventors QU LIJUAN
屈丽娟
PANG CHUNLEI
庞春雷
DENG ZHIQIANG
邓志强
REN JIANGUO
任建国
HE XUEQIN
贺雪琴
Agents 北京品源专利代理有限公司 11332
Title
(EN) Silicon-oxygen composite material, preparation method thereof, negative electrode material and lithium ion battery
(ZH) 硅氧复合材料、其制备方法、负极材料及锂离子电池
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Abstract
(EN) The invention relates to a silica composite material, a preparation method thereof, a negative electrode material and a lithium ion battery. The silicon-oxygen composite material comprises an inner core and a carbon layer formed on the surface of the inner core, the inner core comprises a lithium-containing compound and a non-metal silicon-containing material, the non-metal silicon-containing material comprises at least one of nanometer silicon and silicon oxide, and the non-metal silicon-containing material is dispersed in the lithium-containing compound; and the size D10 of the silica composite material is 3.0-8.2 [mu]m. According to the invention, the particle size D10 of the silicon-oxygen composite material is controlled at 3.0-8.2 [mu]m, so that on one hand, the pre-lithiation uniformity can be improved, no nano silicon is exposed on the particle surface, and expected first-effect improvement and good cycling stability performance are obtained; on the other hand, proper electron and ion conduction paths are achieved, the internal impedance of particles is small, and the rate performance and the cycle performance of the material are improved.
(ZH) 本发明涉及一种硅氧复合材料、其制备方法、负极材料及锂离子电池。所述硅氧复合材料包括内核和形成于所述内核表面的碳层，所述内核包括含锂化合物和非金属含硅材料，所述非金属含硅材料包括纳米硅及硅氧化物中的至少一种，所述非金属含硅材料分散于所述含锂化合物中；所述硅氧复合材料的尺寸D10为3.0μm～8.2μm。本发明通过将硅氧复合材料的粒径D10控制在3.0μm～8.2μm之间，一方面可以提升预锂均匀性，没有纳米硅暴露在颗粒表面，获得预期的首效提升及良好的循环稳定性能；另一方面具有合适的电子、离子传导路径，颗粒内部阻抗小，提升材料的倍率性能和循环性能。
Related patent documents
WO/2022/041831
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