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Ion-doped spherical Li4Ti5O12/C lithium ion battery anode material and preparation method thereof

A lithium-ion battery, ion doping technology, applied in battery electrodes, circuits, electrical components and other directions, can solve the problems of poor conductivity, low packing density, difficult to high cycle specific capacity cycle capacity retention rate, etc., to improve the conductivity, The effect of high packing density and improved charge-discharge cycle performance

Inactive Publication Date: 2011-06-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the material has the problems of poor conductivity and low bulk density. According to previous research results, people have improved the conductivity of the material to a large extent by synthesizing nano-sized particles and compounding with conductive materials, and by synthesizing spherical particles Greatly increased the bulk density of the material
The conductivity of the material can be improved by ion doping, but it is difficult to obtain high cycle specific capacity and high cycle capacity retention by ordinary ion doping

Method used

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  • Ion-doped spherical Li4Ti5O12/C lithium ion battery anode material and preparation method thereof
  • Ion-doped spherical Li4Ti5O12/C lithium ion battery anode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0016] Weigh TiCl 4 Put it in a beaker, add deionized water, and hydrolyze to obtain 2mol / L TiOCl 2 Solution; then weigh LaCl with a molar ratio of La / Ti=1∶100 3 , Dissolved in the above TiOCl 2 In the solution, a homogeneous mixed solution is obtained. Prepare an aqueous ammonia solution with a concentration of 2mol / L. Under stirring, slowly add the aqueous ammonia solution to the above mixed solution until the pH value of the solution reaches 10, stop adding the alkaline solution, centrifuge, and wash to obtain uniform doped ions. La’s hydrated titanium oxide sol precursor; then weigh Li at the ratio Li:Ti=4:5 2 CO 3 , Press and finally generated Li 4 Ti 5 O 12 (Calculated on the basis of the added titanium) Weigh the sucrose with a mass percentage of 20% by weight (because the specific amount of titanium is not indicated in the previous expression, the specific mass of sucrose cannot be calculated here), and the sucrose is evenly dispersed by ball milling In the sol; the obta...

Embodiment 2

[0019] Weigh TiOSO 4 Put it in a beaker, add deionized water, and dissolve to prepare 5mol / L TiOSO 4 Solution; then weigh YCl with a molar ratio of Y / Ti=0.1∶100 3 , Dissolved in the above TiOSO 4 In the solution, a homogeneous mixed solution is obtained. Prepare a NaOH solution with a concentration of 10mol / L. Under stirring, slowly add the NaOH solution to the above mixed solution until the pH value of the solution reaches 10, stop adding the alkali solution, centrifuge, and wash to obtain uniform doped ions. Y hydrated titanium oxide sol precursor; then weigh LiNO at the ratio of Li:Ti=4.05:5 3 , Press and finally generated Li 4 Ti 5 O 12 (Calculated on the basis of the added titanium) Weigh glucose with a mass percentage of 30wt%, and disperse it evenly in the sol by ball milling; the resulting mixed liquid is dried with an airflow spray dryer, using a co-current drying method, and an atomizing device Adopt a dual-flow nozzle, feed with a peristaltic pump at a speed of 10-20m...

Embodiment 3

[0022] Weigh TiCl 4 Put it in a beaker, add deionized water, and hydrolyze to produce 0.1mol / L TiOCl 2 Solution; then weigh MnCl with a molar ratio of Mn / Ti=3∶100 2 Or MnSO 4 , Dissolved in the above TiOCl 2 In the solution, a homogeneous mixed solution is obtained. Prepare a KOH solution with a concentration of 0.1 mol / L. Under stirring conditions, slowly add the KOH solution to the above mixed solution until the pH value of the solution reaches 10, stop adding the alkali solution, centrifuge, and get a uniform doped content after washing The precursor of hydrated titanium oxide sol of ion Mn; then weigh LiOH·H at the ratio of Li:Ti=3.95:5 2 O. Press and finally generated Li 4 Ti 5 O 12 (Calculated based on the added titanium) Weigh the phenolic resin with a mass percentage of 5wt%, and disperse it in the sol uniformly by ball milling; the resulting mixed liquid is dried with an airflow spray dryer, using a co-current drying method, and atomized The device adopts a dual-flow no...

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Abstract

The invention discloses an ion-doped spherical Li4Ti5O12 / C lithium ion battery anode material and a preparation method thereof. The method comprises the following steps of: 1) uniformly dispersing a lithium source compound and a carbon source compound into ion-doped titanium oxide sol and spray-drying to obtain spherical powder; and 2) under the protection of an inert gas, performing heat treatment on the spherical powder to obtain the ion-doped spherical Li4Ti5O12 / C lithium ion battery anode material. The method for preparing the ion-doped spherical Li4Ti5O12 / C lithium ion battery anode material provided by the invention improves the electric conductivity of the material by compounding Li4Ti5O12 with carbon and stabilizes the crystal structure of the material by doping ions so as to further improve the charge-discharging cycle performance of the material. The method has a simple process flow; and the obtained lithium ion battery anode material is spherical, and has suitable particle sizes and reasonable particle diameter distribution, high stacking density and a very good application prospect in the field of lithium ion batteries.

Description

Technical field [0001] The invention belongs to the technical field of energy materials, and relates to a lithium ion battery negative electrode material, in particular to an ion-doped spherical Li 4 Ti 5 O 12 / C Lithium-ion battery anode material and preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries, which are widely used in small and medium capacity and low power fields such as mobile phones and notebook computers. The technology has become mature. In the future, the development direction of lithium-ion batteries is high-power power batteries and high-capacity energy storage batteries. As power batteries and energy storage batteries, it must have the characteristics of low cost, high safety, long cycle life, and green and non-toxic. The development of batteries requires major breakthroughs in electrode materials. [0003] Currently, most of the commercially available anode materials for lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/133
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 高剑姜长印李建军杨改万春荣
Owner TSINGHUA UNIV
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