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Lithium titanate electrode material with core-shell structure, preparation method and application

An electrode material, core-shell structure technology, applied in the field of lithium ion battery materials and battery preparation, can solve the problems of slow lithium ion intercalation, poor battery rate performance, etc., to improve lithium ion transmission rate, reduce expansion rate, The effect of improving cycle performance

Active Publication Date: 2016-12-21
深圳博磊达新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charging and discharging process, the intercalation speed of lithium ions is slow, and the battery rate performance becomes poor.

Method used

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  • Lithium titanate electrode material with core-shell structure, preparation method and application
  • Lithium titanate electrode material with core-shell structure, preparation method and application
  • Lithium titanate electrode material with core-shell structure, preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0029] Lithium titanate electrode material with core-shell structure, the inner core is lithium titanate, along the inner core, there are intermediate carbon layer and lithium metaaluminate composite layer in sequence, and the intermediate carbon layer and lithium metaaluminate composite layer constitute the outer shell of the material . Wherein, the size of the inner core is 500nm, the thickness of the middle carbon layer is 30nm, and the thickness of the lithium metaaluminate composite layer is 30nm.

[0030] The preparation steps of lithium titanate electrode material are:

[0031] 1) Preparation of the raw material mixture for the intermediate carbon layer and the raw material mixture for the lithium metaaluminate composite layer:

[0032] Mix 100g of glucose, 2g of polyethylene glycol, 2g of carbon nanotubes and 1000mL of formic acid evenly to obtain the mixed solution A, which is the mixed solution of the intermediate carbon layer raw materials;

[0033] Mix 100g of li...

Embodiment 2

[0039] Lithium titanate electrode material with core-shell structure, the inner core is lithium titanate, along the inner core, there are intermediate carbon layer and lithium metaaluminate composite layer in sequence, and the intermediate carbon layer and lithium metaaluminate composite layer constitute the outer shell of the material . Wherein, the size of the inner core is 200nm, the thickness of the middle carbon layer is 10nm, and the thickness of the lithium metaaluminate composite layer is 10nm.

[0040] The preparation steps of lithium titanate electrode material are:

[0041] 1) Preparation of the raw material mixture for the intermediate carbon layer and the raw material mixture for the lithium metaaluminate composite layer:

[0042] Mix 50g of sucrose, 1g of sodium dodecylsulfonate, 1g of carbon nanotubes and 1000mL of acetic acid evenly to obtain a mixed solution A, which is the mixed solution of the intermediate carbon layer raw materials;

[0043] Mix 50g of li...

Embodiment 3

[0048] Lithium titanate electrode material with core-shell structure, the inner core is lithium titanate, along the inner core, there are intermediate carbon layer and lithium metaaluminate composite layer in sequence, and the intermediate carbon layer and lithium metaaluminate composite layer constitute the outer shell of the material . Wherein, the size of the inner core is 500nm, the thickness of the middle carbon layer is 50nm, and the thickness of the lithium metaaluminate composite layer is 50nm.

[0049] The preparation steps of lithium titanate electrode material are:

[0050] 1) Preparation of the raw material mixture for the intermediate carbon layer and the raw material mixture for the lithium metaaluminate composite layer:

[0051] Mix 200g of citric acid, 2g of sodium dodecylsulfonate, 2g of carbon nanotubes and 1000mL of benzoic acid evenly to obtain a mixed solution A, which is the mixed solution of the intermediate carbon layer raw materials;

[0052] Mix 200...

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Abstract

The invention discloses a lithium titanate electrode material with a core-shell structure, a preparation method and application, and belongs to the technical field of lithium ion battery materials and battery preparation. The lithium titanate electrode material is of the core-shell structure, lithium titanate serves as an inner core, a middle carbon layer and a lithium metaaluminate composite layer are sequentially arranged along the inner core outwards, and a shell of the material is formed by the middle carbon layer and the lithium metaaluminate composite layer. In the structure, the middle carbon layer can obstruct electron transfer between lithium titanate and electrolyte, lithium titanate and the electrolyte are prevented from being in direct contact, therefore, side reactions are reduced, the battery bloating amount is reduced, and the expansion rate of a battery is reduced. Meanwhile, a lithium metaaluminate material covering the surface of the electrode material has the advantage of being high in lithium ion conductivity, the lithium ion transmission rate of the lithium titanate battery under the large-rate condition can be increased, and therefore the rate performance of the battery is improved. Nano / micro holes formed in the lithium metaaluminate composite layer due to decomposition of a binding agent at high temperature can absorb and store the electrolyte, and therefore the circulating performance of the electrode material can be improved.

Description

technical field [0001] The invention relates to a lithium titanate electrode material with a core-shell structure, and also relates to a preparation method and application of the electrode material, belonging to the technical field of lithium ion battery materials and battery preparation. Background technique [0002] Lithium titanate (Li 4 Ti 5 o 12 , LTO) as an anode material for lithium-ion batteries has irreplaceable advantages compared with traditional graphite anode materials: 1) High lithium intercalation potential (about 1.55V, vsLi / Li + ), no lithium dendrites will be precipitated during the charging and discharging process, and the safety performance is good, which can eliminate the safety hazard of lithium-ion batteries from the material; 2) The material results hardly change during the charging and discharging process, which is a "zero strain" 3) The chemical diffusion coefficient of lithium electrons is an order of magnitude higher than that of graphite, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/364H01M4/485H01M4/624H01M10/0525Y02E60/10
Inventor 王燕吴英鹏张帆原东甲李志赵晓锋
Owner 深圳博磊达新能源科技有限公司
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