A preparation method and application of lithium titanate hierarchical structure microspheres
A hierarchical structure, lithium titanate technology, applied in structural parts, nanotechnology for materials and surface science, electrical components, etc., can solve the problems of low diffusion rate lithium titanate, low conductivity, etc., to achieve a simple, The effect of long cycle life and low cost
Active Publication Date: 2019-09-13
PEKING UNIV
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[0004] The present invention aims to overcome the lower electrical conductivity of lithium titanate and the diffusion rate of lithium ions and the lower packing density of lithium titanate in nanostructures by preparing hierarchical structure microspheres of ultrathin lithium titanate nanosheets , improve the electrochemical performance of lithium titanate and push it to practical application
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[0023] Below in conjunction with the accompanying drawings, the technical solutions of the present invention will be further described through the embodiments, but the protection scope of the present application is not limited by the specific conditions of these embodiments.
[0024] The invention provides a method for preparing ultra-thin lithium titanate nanosheet microspheres with a hierarchical structure by using a hydrothermal method, and the method comprises the following steps:
[0025] 1) Preparation of sodium titanate nanowires: weigh 2g of titanium dioxide P25 and disperse it in a 10mol / L NaOH solution, place the resulting mixed solution in a hydrothermal kettle, and perform a hydrothermal reaction at 120°C for 24 hours to obtain sodium titanate nanowires ;
[0026] 2) Preparation of sodium titanate hierarchical structure microspheres: Weigh 0.2 g of sodium titanate nanowires and disperse them in 38.5 mL of 2mol / L NaOH solution, and add 1.5 mL of H 2 O 2 , the obta...
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Abstract
The invention discloses a preparation method and application of lithium titanate hiberarchy microspheres. Sodium titanate nanowires and sodium titanate hiberarchy microspheres are prepared sequentially with a hydrothermal method, titanium acid hiberarchy microspheres are obtained via acid exchange, and the hiberarchy microspheres of ultra-thin lithium titanate nanomaterials are obtained through the hydrothermal method. The method is simple and low in cost, the prepared lithium titanate hiberarchy microspheres are good in electrochemical performance, long cycle life in high magnification is achieved, and the lithium titanate hiberarchy microspheres are good electrode materials for lithium-ion batteries.
Description
technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method of a graded structure lithium titanate negative electrode material applied to high rate and long cycle life lithium ion batteries. Background technique [0002] With the development of hybrid vehicles and electric vehicles, people's requirements for power lithium-ion batteries are getting higher and higher. However, it is difficult for the current commercial graphite anodes to meet the needs of HEVs and EVs for lithium-ion batteries with fast charge-discharge and long cycle life. This is mainly due to the low lithium ion diffusion coefficient of graphite materials, which makes it difficult to achieve rapid charge and discharge; and the potential of its lithium intercalation is close to that of metal lithium, which is prone to precipitation of metal lithium to form lithium dendrites during overcharge, so there is a safety problem. Especially in the state ...
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IPC IPC(8): H01M4/485B82Y30/00
CPCB82Y30/00H01M4/485Y02E60/10
Inventor 徐东升何逸仕李琦
Owner PEKING UNIV