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Surface modification method for positive electrode active material of lithium secondary battery

A technology for positive electrode active materials and lithium secondary batteries, which is applied in the field of surface modification of positive electrode materials, can solve the problems of complex surface modification procedures, high cost, and dependence, and achieve improved structural stability and thermal stability, good structural stability and Volume retention, easily repeatable results

Active Publication Date: 2016-03-09
JIANGSU XIANGYING NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The object of the present invention is: by adding LiPF to the lithium secondary battery 6 A certain proportion of Lewis acid is added to the base electrolyte to provide a new method for surface modification of positive electrode active materials in lithium secondary batteries, which overcomes the complex surface modification procedures, long processing cycles, dependence on various equipment, and production efficiency in the prior art. low cost problem

Method used

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  • Surface modification method for positive electrode active material of lithium secondary battery
  • Surface modification method for positive electrode active material of lithium secondary battery
  • Surface modification method for positive electrode active material of lithium secondary battery

Examples

Experimental program
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Embodiment 1

[0029] Cathode material LiCoO 2 Made by sol-gel method. In a typical experiment, a certain amount of lithium nitrate, cobalt nitrate and citric acid were weighed in a molar ratio of 1.1:1:3.15, and placed in three beakers and stirred thoroughly to form a transparent aqueous solution. Next, the three are uniformly mixed under vigorous stirring, and the pH value of the solution is adjusted to 7.0 by ammonia water, and then heated to 80 ? C under stirring for 5h to form a sol, the sol at 120 ? C evaporated to dryness for 12h to form the corresponding xerogel. Finally, dry the gel at 750°C in an air atmosphere ? C annealed for 4 hours, and naturally cooled to room temperature, and finally obtained LiCoO 2 Black powder, average particle size 100nm.

[0030] For comparison, first prepare MgF 2 Coated LiCoO 2 Material: LiCoO to be prepared 2 Disperse evenly in water, then add ammonium fluoride and magnesium nitrate dissolved in water in advance dropwise (according to the mola...

Embodiment 2～20

[0037] The addition amount of the Lewis acid additive and the soaking conditions (as shown in Table 1) were changed respectively, and the implementation of Examples 2-20 was carried out in the same way as the above-mentioned Example 1.

[0038] Then the cathode material prepared in Examples 2-20 is made into an anode sheet by the method adopted in Example 1, and the new electrolyte soaked in Lewis acid is selected to be assembled into a lithium secondary battery, and its cycle performance is tested (the results are as follows: shown in Table 2).

[0039] The positive active material of Examples 1-7 is LiCo with a hexagonal layered structure. 1-a M1 a o 2 , where M1 is at least one of Ni, Mn, Al, Mg, Ti, Cr, Cu, Sn, Zn, V, Y, 0≤a≤1.

[0040] The positive electrode active material of embodiment 8~10 is VO x (1

[0041]The positive electrode active material of Examples 11-15 is LiMn with spinel structure 2-b M2 b o 4 , where M...

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Abstract

The invention provides a surface modification method for positive electrode active materials of lithium secondary batteries, comprising: 1) adding 0.01g to 50g of Lewis acid into 50mL? In the LiPF6-based electrolyte, stand and soak at room temperature to 55°C for 0.25 to 50 days; 2) Assemble the battery on the normally coated electrode sheet according to the conventional procedure, and use the supernatant obtained by soaking in 1) as the new electrolyte 3) Put the battery in the test channel according to the routine procedure to complete the relevant test tasks. The lithium secondary battery using the modified positive electrode material prepared by the present invention can be charged to a higher voltage, has a higher actual specific capacity and excellent cycle performance, and the existence of this layer of surface modification layer is also conducive to improving the thermal safety of the material sex.

Description

technical field [0001] The invention belongs to the technical field of high-energy batteries, and in particular relates to a new method for surface modification of the positive electrode active material of a lithium secondary battery to realize the surface modification of the positive electrode material, which can be similar to the surface coating of the positive electrode active material of the lithium secondary battery modification effect. Background technique [0002] Lithium-ion batteries and secondary lithium batteries (hereinafter collectively referred to as lithium secondary batteries) have developed rapidly in the field of portable electronic devices due to their high energy density, high working voltage, long cycle life and no pollution. Field applications have also begun. In the extensive application process of lithium secondary batteries, the performance and price of batteries are the decisive factors. Lithium secondary batteries are mainly composed of positive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058
CPCH01M10/052H01M10/0567H01M10/058Y02E60/10Y02P70/50
Inventor 白莹尹延锋邱永宽孙献文张伟风
Owner JIANGSU XIANGYING NEW ENERGY TECH CO LTD