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Preparation method of titanate composite negative electrode material for lithium ion battery

A technology of lithium ion battery and negative electrode material, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low conductivity, capacity decay, poor rate performance, etc., achieve high crystallinity, improve energy density and power Effect of density and stable cycle life

Active Publication Date: 2019-08-27
NANJING GUOXUAN BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are also major problems in the compatibility of carbon materials and electrolytes, resulting in capacity fading
Compared with graphite, high structural stability and safety make Li 4 Ti 5 o 12 It has become a negative electrode material with great application potential, but the low conductivity and poor rate performance of this material limit its application in the field of power batteries

Method used

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  • Preparation method of titanate composite negative electrode material for lithium ion battery
  • Preparation method of titanate composite negative electrode material for lithium ion battery
  • Preparation method of titanate composite negative electrode material for lithium ion battery

Examples

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Embodiment 1

[0031] A preparation method of a titanate composite negative electrode material for a lithium ion battery, comprising the steps of:

[0032] S1, 12mmol tetrabutyl titanate (C 16 h 36 o 4 Ti), 13.2mmol chromium nitrate (Cr(NO 3 ) 3 9H 2 O) be dissolved in ethanol aqueous solution, add under the condition of stirring and contain 36mmol citric acid (C 6 h 8 o 7 ·H 2 O) aqueous solution, 15mmol lithium nitrate (LiNO 3 ) in a water bath at a temperature of 70°C until it becomes gelatinous, put it into an oven at 80°C for drying, put it in a muffle furnace after grinding, pre-sinter at a temperature of 600°C for 6 hours, and cool to room temperature to obtain LiCrTiO 4 -0.05Cr 2 o 3 Precursor;

[0033] S2, the LiCrTiO obtained by 1000mg 4 -0.05Cr 2 o 3 Precursor, 40mgFePO 4 Dissolve in absolute ethanol, stir evenly, evaporate to dryness at a temperature of 60°C, send it to an oven at 80°C for drying, cool to room temperature, put it in a ball mill for ball milling fo...

Embodiment 2

[0041] A preparation method of a titanate composite negative electrode material for a lithium ion battery, comprising the steps of:

[0042] S1, 12mmol tetrabutyl titanate (C 16 h 36 o 4 Ti), 12.72mmol chromium nitrate (Cr(NO 3 ) 3 9H 2 O) be dissolved in ethanol aqueous solution, add under the condition of stirring and contain 36mmol citric acid (C 6 h 8 o 7 ·H 2 O) aqueous solution, 15mmol lithium nitrate (LiNO 3 ) in a water bath with a temperature of 70°C until it becomes gelatinous, then put it into an oven at 80°C for drying, put it in a muffle furnace after grinding, pre-fire at a temperature of 600°C for 6 hours, and cool to room temperature to obtain LiCrTiO 4 -0.03Cr 2 o 3 Precursor;

[0043] S2, the LiCrTiO obtained by 1000mg 4 -0.03Cr 2 o 3 Precursor, 40mgFePO 4 Dissolve in absolute ethanol, stir evenly, evaporate to dryness at a temperature of 60°C, send it to an oven at 80°C for drying, cool to room temperature, put it in a ball mill for ball mill...

Embodiment 3

[0047] A preparation method of a titanate composite negative electrode material for a lithium ion battery, comprising the steps of:

[0048] S1, 12mmol tetrabutyl titanate (C 16 h 36 o 4 Ti), 13.92mmol chromium nitrate (Cr(NO 3 ) 3 9H 2 O) be dissolved in ethanol aqueous solution, add under the condition of stirring and contain 36mmol citric acid (C 6 h 8 o 7 ·H 2 O) aqueous solution, 15mmol lithium nitrate (LiNO 3 ) in a water bath at a temperature of 70°C until it becomes gelatinous, put it into an oven at 80°C for drying, put it in a muffle furnace after grinding, pre-sinter at a temperature of 600°C for 6 hours, and cool to room temperature to obtain LiCrTiO 4 -0.08Cr 2 o 3 Precursor;

[0049] S2, the LiCrTiO obtained by 1000mg 4 -0.08Cr 2 o 3 Precursor, 40mgFePO 4 Dissolve in absolute ethanol, stir evenly, evaporate to dryness at a temperature of 60°C, dry in an oven at 80°C, cool to room temperature, place in a ball mill for ball milling for 4 hours, siev...

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Abstract

The invention discloses a preparation method of a titanate composite negative electrode material for a lithium ion battery. The preparation method comprises the following steps of dissolving a titanium source and a chromium source in an ethanol aqueous solution, adding citric acid under a stirring condition, adding the ethanol aqueous solution comprising a lithium source, performing water bath heating to form a gel state, performing drying and grinding, placing the product in a muffle furnace for pre-burning, and cooling to a room temperature to obtain a LiCrTiO<4-a<Cr2O3 precursor; dissolvingthe LiCrTiO<4-a<Cr2O3 precursor and FePO4 in absolute ethyl alcohol, performing uniform stirring and drying, cooling to the room temperature, placing the product in a ball-milling machine for ball-milling, performing sieving, placing the product in the muffle furnace for calcination, and cooling to the room temperature to obtain a LiCrTiO<4-a>Cr2O3-FePO4 electrode material; and dispersing the electrode material in an acetone solution, adding CNT, performing stirring, allowing a liquid to be completely volatilized to obtain the titanate composite negative electrode material for the lithium ionbattery. The preparation method has the advantages of wide raw materials, good controllability and high reproducibility and is simple and convenient to operate, the obtained material is relatively small in particle, uniform in grain size distribution and high in crystallinity, so that the material preparation cost is reduced, and the electrochemical performance of the material is improved.

Description

technical field [0001] The invention relates to the technical field of titanate composite negative electrode materials, in particular to a preparation method of titanate composite negative electrode materials for lithium ion batteries. Background technique [0002] At present, most of the anode materials of commercial lithium-ion batteries are carbon-based materials, and their chemical potential for lithium intercalation is very close to that of metal lithium, which is conducive to improving the working voltage and energy density of lithium-ion batteries. However, carbon materials have poor high-rate charge-discharge performance and face serious safety issues. Although the protection circuit of lithium-ion batteries is relatively mature, for power batteries, the selection of electrode materials is very critical to truly ensure safety. The new generation of vehicles with low environmental load such as HEV and EV currently under development require high-power and high-safety ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M4/58H01M4/583H01M10/0525
CPCH01M4/362H01M4/485H01M4/48H01M4/5825H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 韩明凯姚汪兵
Owner NANJING GUOXUAN BATTERY CO LTD
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