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Titanium dioxide (B) negative electrode material with improved performance and preparation method thereof

A technology of titanium dioxide and negative electrode materials, which is applied in the direction of negative electrodes, active material electrodes, battery electrodes, etc., can solve the problems that the energy density of batteries cannot be further greatly improved, the cycle performance of graphite is poor, and the lithium intercalation capacity of graphite is low, so as to improve lithium intercalation space, improvement of cycle performance, and improvement of electrical conductivity

Pending Publication Date: 2022-02-11
SHENZHEN XIANGFENGHUA TECH CO LTD +1
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Problems solved by technology

[0003] At the same time, most traditional lithium batteries use graphite materials as negative electrode materials. Due to the high degree of graphitization of graphite materials and a high degree of layered structure, the space for lithium intercalation is small, so that the lithium intercalation capacity of graphite is low. The cycle performance is poor, so that the energy density of the battery cannot be further greatly improved. Therefore, for TiO 2 (B) It is a technical problem in the field to develop a method for preparing a titanium dioxide (B) negative electrode material with good cycle performance and high initial charge and discharge efficiency

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  • Titanium dioxide (B) negative electrode material with improved performance and preparation method thereof

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[0022] The present invention also discloses a method for preparing a titanium dioxide (B) negative electrode material with improved properties, comprising the following steps:

[0023] (1) Mixing: immerse the titanium dioxide (B) in an ethanol solvent of ethyl orthosilicate, stir and sonicate for 0.5-2 hours to prepare a mixed solution.

[0024] (2) Roasting: Evaporate the mixed solution prepared in (1) to dryness in a water bath at 60-90°C, put it in an oven for drying, and then place it in a muffle furnace. The temperature is raised to 500-1000°C at a rate of °C / min, high-temperature roasting is carried out, and the temperature is kept for 2-5 hours to obtain surface-modified titanium dioxide (B).

[0025] (3) Dispersion: disperse the surface-modified titanium dioxide (B), graphite, lithium source, dopant, and carbon source in ethanol, and ultrasonicate for 1-4 hours to obtain a mixed slurry.

[0026] (4) Grinding: Grinding the mixed slurry obtained in (3) for 1-5 hours wit...

Embodiment 1

[0032] A titanium dioxide (B) negative electrode material with improved properties, comprising the following raw materials by weight: 130 parts of titanium dioxide (B), 20 parts of tetraethyl orthosilicate, 100 parts of graphite, 100 parts of lithium source, 5 parts of doped Miscellaneous agent, 28 parts of carbon source, 35 parts of ionic liquid; The ionic liquid is N-methylbutylpyrrolidine bistrifluoromethanesulfonimide salt and N-methylbutylpiperidine bistrifluoromethanesulfonyl imide salt.

[0033] A method for preparing a titanium dioxide (B) negative electrode material with improved properties, comprising the following steps:

[0034] (1) Mixing: immerse titanium dioxide (B) in ethanol solvent of ethyl orthosilicate, stir and sonicate for 2 hours to prepare a mixed solution.

[0035] (2) Roasting: Evaporate the mixed solution prepared in (1) to dryness in a water bath at 80°C, put it in an oven for drying, and then place it in a muffle furnace. Raise the temperature to...

Embodiment 2

[0042] A titanium dioxide (B) negative electrode material with improved properties, comprising the following raw materials by weight: 155 parts of titanium dioxide (B), 40 parts of tetraethyl orthosilicate, 60 parts of graphite, 130 parts of lithium source, 7 parts of doped Miscellaneous agent, 35 parts of carbon source, 45 parts of ionic liquid; The ionic liquid is 1-ethyl-3-methylimidazole bis-trifluoromethanesulfonimide salt and 1-ethyl-3-methylimidazole tetrafluoro borate.

[0043] A method for preparing a titanium dioxide (B) negative electrode material with improved properties, comprising the following steps:

[0044](1) Mixing: immerse titanium dioxide (B) in an ethanol solvent of ethyl orthosilicate, stir and sonicate for 0.5 h to obtain a mixed solution.

[0045] (2) Roasting: Evaporate the mixed solution prepared in (1) to dryness in a 60°C water bath, put it in an oven for drying, and then place it in a muffle furnace. Raise the temperature to 1000° C., perform hi...

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Abstract

The invention discloses a titanium dioxide (B) negative electrode material with improved performance and a preparation method thereof. The titanium dioxide (B) negative electrode material is prepared from the following raw materials in parts by weight: 130-195 parts of titanium dioxide (B), 20-85 parts of tetraethoxysilane, 60-135 parts of graphite, 90-130 parts of a lithium source, 5-13 parts of a dopant, 25-35 parts of a carbon source and 35-45 parts of ionic liquid. The raw materials are prepared through the procedures of mixing, roasting, dispersing, grinding, drying, wrapping and sintering at a time. The negative electrode material prepared by the formula and the preparation method disclosed by the invention has excellent capacity performance, cycle performance, rate charge-discharge performance and first charge-discharge efficiency.

Description

technical field [0001] The invention relates to the technology in the field of lithium batteries, in particular to a titanium dioxide (B) negative electrode material with improved performance and a preparation method thereof. Background technique [0002] Titanium dioxide is an inorganic substance, which is widely used in coatings, plastics, papermaking, printing ink, chemical fiber, rubber, cosmetics and other industries. Common titanium dioxide mainly includes four crystal phases: anatase phase, rutile phase, brookite phase and TiO 2 (B) phase. Among all crystal phases, TiO 2 (B)-type titanium dioxide belongs to the monoclinic system, with the loosest structure, large interlayer spacing and low density, which is conducive to the intercalation and removal of lithium ions, so it has potential superior performance in the application of lithium-ion batteries . [0003] At the same time, most traditional lithium batteries use graphite materials as negative electrode materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/1391H01M4/1393
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M2004/027Y02E60/10
Inventor 宋宏芳滕克军白宇赵东辉周鹏伟
Owner SHENZHEN XIANGFENGHUA TECH CO LTD
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