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Surface modified positive electrode material and preparation method and application thereof

A cathode material and surface modification technology, applied in the field of cathode materials for lithium-ion batteries, can solve the problems of poor conductivity, inactive oxides, sacrificing partial capacity and rate performance of cathode materials, etc.

Active Publication Date: 2017-10-10
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can improve the cycle performance of cathode materials to a certain extent, most of these oxides are inactive and have poor conductivity, so that part of the capacity and rate performance of cathode materials are sacrificed; moreover, the long-term cycle oxide layer is also easily damaged HF attack in electrolyte

Method used

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  • Surface modified positive electrode material and preparation method and application thereof
  • Surface modified positive electrode material and preparation method and application thereof
  • Surface modified positive electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The positive electrode material in this example is Prussian blue compound K 2 NiFe(CN) 6 to LiMn 2 o 4 Coated, its preparation method is as follows figure 1 As shown, including respectively configuring alkali metal salt solution and transition metal salt solution, and then slowly adding the two to the dispersion of positive active material at the same time to obtain a positive active material physically coated with Prussian blue compounds, and then annealing treatment to obtain element-doped cathode materials.

[0045] The detailed preparation method is as follows:

[0046] Weigh 0.1689g K 4 Fe(CN) 6 and 0.1163g Ni(NO 3 ) 2 ·6H 2 O, were dissolved in 50ml of deionized water to make a solution. LiMn 2 o 4 5g of powder and 0.2g of dispersant are configured into a positive electrode active material dispersion with a mass fraction of 10%, and the positive electrode active material dispersion is placed in a water bath at 50°C. 4 Fe(CN) 6 solution and Ni(NO 3 )...

Embodiment 2

[0050] The positive electrode material in this example is Prussian blue compound Fe 4 [Fe(CN) 6 ] 3 For Li(NiCoMn) 1 / 3 o 2 The detailed preparation method is as follows:

[0051] Weigh 0.1267g K 4 Fe(CN) 6 , dissolved in 50ml of deionized water to make a solution. Another 3gLi(NiCoMn) 1 / 3 o 2 Powder, 0.0649g FeCl 3 Add 0.5g of dispersant to 100ml of deionized water to prepare a mixed dispersion containing positive electrode materials, place the mixed dispersion in a water bath at 50°C, and while stirring continuously, mix the prepared K 4 Fe(CN) 6 The solution is slowly added to the mixed dispersion liquid. After the addition is completed, the reaction is continued for 1 h, and the product is filtered, washed and dried to obtain the Li(NiCoMn) whose surface is physically coated with nano-scale Prussian blue compounds in this example. 1 / 3 o 2 . The coating amount of the Prussian blue compound detected by ICP is Li(NiCoMn) 1 / 3 o 2 2% of mass. Li(NiCoMn) whose sur...

Embodiment 3

[0053] In this example, based on Example 1, the alkali metal salt solution and the transition metal solution are respectively prepared, and then the two are slowly added dropwise into the positive electrode active material dispersion at the same time. The preparation method of this example is the same as that of Example 1, except that the specific metal salt solution, transition metal solution, and specific coated positive electrode active material are different. At the same time, the specific annealing temperature and time are also different. Other conditions And each component consumption is all identical with embodiment one. The materials and annealing treatments used in each test of this example are shown in Table 1.

[0054] Table 1 Test materials and annealing treatment

[0055]

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Abstract

The invention discloses a surface modified positive electrode material and the preparation method and application thereof. The surface modified positive electrode material is formed by positive active material particles coated with nano Prussian blue compounds on the surface; the Prussian blue compounds are illustrated in formula 1; formula 1: AnMx[Fe(CN)6]y, wherein A is alkali metal, M is transition metal, the range of n, x and y is 0-2, and n and x are not equal to 0 at the same time. Compared with the oxide coating in the prior art, the positive electrode material disclosed by the invention is coated with Prussian blue compounds on the surface, therefore, the positive electrode material is less susceptible to be eroded by HF, and can block the electrolyte well, inhibit the transition metal to dissolve, improve the interfacial properties of the electrode material, and improve the cycle stability of the positive electrode material; moreover, the nano Prussian blue compounds have electrochemical activity and can improve the capacity of the positive electrode material. The positive electrode material disclosed by the invention is simple to prepare and easy to control, which lays a foundation for the preparation of high quality lithium ion batteries.

Description

technical field [0001] The present application relates to the field of positive electrode materials for lithium-ion batteries, in particular to a surface-modified positive electrode material and its preparation method and application. Background technique [0002] Lithium-ion batteries are a new generation of green energy storage devices with excellent performance, which have been developed rapidly in recent years. However, with the advancement of technology and the improvement of people's living standards, higher requirements are placed on this energy storage device. In the composition of lithium-ion batteries, the positive electrode material occupies the most important position, and the performance of the positive electrode material will directly determine the performance index of the final lithium-ion battery product. [0003] Among the positive electrode materials currently used in lithium-ion batteries, the most promising ones are mainly nickel-cobalt-manganese ternary ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 邓文君李锐潘锋
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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