High-performance lithium ion battery electrode material and preparation method

A lithium-ion battery and electrode material technology, applied in the field of electrochemistry, can solve problems such as poor cycle life of titanium pyrophosphate electrode materials, achieve the effects of overcoming poor cycle performance, ensuring cycle performance, and improving structural stability

Active Publication Date: 2013-07-10
常州孚达新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a novel titanium pyrophosphate electrode material with good lithium-ion battery characteristics and its preparation method, to provide the selection of electrode materials for the application of lithium-ion batteries, and to solve the problem of titanium pyrophosphate electrode materials in the prior art. Problem with poor cycle life

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  • High-performance lithium ion battery electrode material and preparation method
  • High-performance lithium ion battery electrode material and preparation method
  • High-performance lithium ion battery electrode material and preparation method

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Embodiment 1

[0025] As a comparative example, a commercial-grade spinel-type LiMn was used for the positive electrode. 2 O 4 , the slurry ratio is in accordance with LiMn 2 O 4 : Conductive agent: Binder = 80:10:10 mixed slurry, and then pressed into a film with a rolling mill, and the pressed film was dried in a vacuum drying oven at a constant temperature of 100 ° C for 6 hours.

[0026] The negative electrode uses pure TiP 2 O 7 , and its synthesis method is as follows: the TiO 2 (3.45g, 30mmol) and NH 4 H 2 PO 4 (1.20g, 15mmol) were mixed and ground according to the stoichiometric ratio, then an appropriate amount of distilled water was added, and the mixture was continuously stirred at 80 ° C until the mixture was dry. Finally, the above mixture was placed in a boat-shaped crucible, and then calcined at 700 ° C in air for 6 hours to obtain TiP 2 O 7 . TiP 2 O 7 The preparation of the electrode is the same as that of the positive electrode. In this example, the actual cap...

Embodiment 2

[0028] As a comparative example, a commercial-grade spinel-type LiMn was used for the positive electrode. 2 O 4 , the slurry ratio is in accordance with LiMn 2 O 4 : Conductive agent: Binder = 80:10:10 mixed slurry, and then pressed into a film with a rolling mill, and the pressed film was dried in a vacuum drying oven at a constant temperature of 100 ° C for 6 hours.

[0029] The anode uses carbon-coated TiP 2 O 7 , its synthesis method is as follows: with the TiP in Example 1 2 O 7(3.33g, 15mmol) as raw material, placed in a mortar and ground into powder, then added with a mass fraction of 0.75% sucrose aqueous solution (30mL), continuously stirred at 80 ° C until the mixture was dry, and finally the above mixture was placed in a boat crucible , and then calcined at 700 °C for 1 hour under nitrogen atmosphere to obtain carbon-coated C(2.8%)-TiP 2 O 7 . The electrode preparation is the same as that of the positive electrode. In this example, the actual capacity of t...

Embodiment 3

[0031] The positive electrode uses commercial grade spinel LiMn 2 O 4 , the slurry ratio is in accordance with LiMn 2 O 4 : Conductive agent: Binder = 80:10:10 mixed slurry, and then pressed into a film with a rolling mill, and the pressed film was dried in a vacuum drying oven at a constant temperature of 100 ° C for 6 hours.

[0032] The negative electrode uses carbon-coated C-Fe x TiP 2 O 7+x , its synthesis method is as follows: with the TiP in Example 1 2 O 7 as raw material, weigh TiP 2 O 7 (3.33g, 15mmol) and FeC 2 O 4 ·2H 2 O (0.32 g, 1.8 mmol) was placed in a mortar and mixed uniformly, then a 0.75% sucrose aqueous solution (30 mL) was added, and the mixture was continuously stirred at 40 ° C until the mixture was dry. Finally, the above mixture was placed in a boat crucible, Then calcined at 700 °C for 1 hour in a nitrogen atmosphere to obtain carbon-coated C(2.6%)-Fe 0.12 TiP 2 O 7.12 . The electrode preparation is the same as that of the positive el...

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Abstract

The object of the present invention is to provide a novel titanium phosphate electrode material having good lithium ion battery characteristics, and is to solve the problem that the cycle life of a titanium pyrophosphate electrode material is poor in the prior art. The electrode material is intercalation compound carbon-coated C-Fe[x]TiP[2]O[7+x], and is a fast ion conductor electrode material of a three-dimensional structure. A preparation method comprises: (1) mixing and grinding TiO2 and NH4H2PO4, adding distilled water, stirring until the mixture is dried, finally placing the mixture in air for calcination to obtain TiP2O7; and (2) taking TiP2O7 obtained in Step (1) as a raw material, weighing TiP2O7 and an iron source material, mixing evenly, then adding a carbon source aqueous solution, stirring continuously at 40 DEG C until the mixture is dried, and finally calcining the mixture in a nitrogen atmosphere to obtain carbon-coated C-Fe[x]TiP[2]O[7+x].

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a novel high-performance lithium ion battery electrode material. Background technique [0002] Titanium Pyrophosphate (TiP 2 O 7 ) electrode materials have attracted much attention due to their advantages of stable structure, good ionic conductivity, good safety, easy preparation, and abundant resources. At present, the application of this material in lithium-ion batteries is divided into two aspects. In organic lithium-ion batteries, titanium pyrophosphate has been widely studied as a positive electrode material; in aqueous lithium-ion batteries, titanium pyrophosphate as a negative electrode material has not been deeply studied. However, the electrochemical performance of this material is not ideal in both systems. In organic systems, pure titanium pyrophosphate has a contradiction between capacity and cycle life. The capacity of titanium pyrophosphate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/10
Inventor 张汉平李成钢孙晓辉杜青
Owner 常州孚达新能源科技有限公司
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