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Preparation method of metaphosphate-containing lithium ion battery positive electrode material

A lithium metaphosphate and ion battery technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of difficult control of material uniformity, limited performance of positive electrode materials, capacity decay, etc., to improve cycle performance and safety Performance, solution to uneven response, and the effect of inhibiting structural decay

Active Publication Date: 2020-03-27
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface structure of the ternary material is prone to excessive delithiation, which makes the layered structure of the material change to a spinel structure and an inert rock salt phase; and the oxidative high-valent transition metal ions on the surface are prone to serious side reactions with the electrolyte, resulting in extreme battery damage. The capacity increases rapidly and the capacity decays rapidly, which also poses a great threat to the safety of the battery.
[0004] The performance of lithium-ion battery cathode materials can be improved by metaphosphate coating, but the existing technology often uses phosphates without metal elements and metal salts for multiple liquid phase reactions and sintering to modify cathode materials. The operation is complicated, and due to multiple additions of coating raw material solutions and multiple sinterings, it is difficult to control the uniformity of material mixing, which in turn leads to oxides such as aluminum oxide and by-products such as lithium phosphate, and trivalent aluminum ions are easily hydrolyzed to cause oxides The further generation of impurities makes the improvement of the performance of the positive electrode material by coating very limited
In addition, the ternary material itself is very sensitive to water, and it is easy to generate residual alkali, which affects the cycle performance and safety performance of the battery

Method used

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  • Preparation method of metaphosphate-containing lithium ion battery positive electrode material
  • Preparation method of metaphosphate-containing lithium ion battery positive electrode material
  • Preparation method of metaphosphate-containing lithium ion battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1g Zn(H 2 PO 4 ) 2 (particle size 100-200nm) with 200g LiNi 0.6 co 0.2 mn 0.2 o 2 Add it into the ball mill jar, weigh the agate balls according to the ball-to-material ratio of 1:1, and then ball mill them at 500rpm for 3h. The ball-milled powder was calcined at 600°C for 5 hours in an oxygen-filled furnace to obtain Zn(PO 3 ) 2 Coated NCM622 cathode material.

[0050] The material obtained in Example 1 has a capacity of 166.89mA·h / g after 100 cycles at 1C, and the cycle retention rate is 99.81%.

[0051] The material obtained in Example 1 is made into a positive electrode of a lithium ion battery, packed into a half cell, and tested for 100 cycles of electrochemical performance at 2.8-4.3 V, 1C, and the results are as follows: figure 2 shown.

[0052] The scanning electron microscope picture of the positive electrode material containing metaphosphate lithium ion battery that embodiment 1 makes figure 1 shown.

Embodiment 2

[0054] 0.2gAl(H 2 PO 4 ) 3 and 1gZn(H 2 PO 4 ) 2 (particle size 20-50nm) with 200gLiNi 0.6 co 0.2 mn 0.2 o 2 Add it into the ball mill jar, weigh the agate balls according to the ball-to-material ratio of 2:1, and then ball mill them at 400rpm for 4h. The ball-milled powder was calcined at 500°C for 5 hours in an oxygen-filled furnace to obtain Al(PO 3 ) 3 and Zn(PO 3 ) 2 Co-coated NCM622 cathode material.

[0055] The material obtained in Example 2 is made into a positive electrode of a lithium ion battery, packed into a half cell, and tested for 100 cycles of electrochemical performance at 2.8-4.3 V, 1C, and the results are as follows: image 3 shown.

[0056] The capacity of material 1C obtained in Example 2 was 165.63 mA·h / g after 100 cycles, and the cycle retention rate was 98.94%.

Embodiment 3

[0058] 10g Al(H 2 PO 4 ) 3 (particle size 50-150nm) with 2000g LiNi 0.6 co 0.2 mn 0.2 o 2 Add it to the mixer and mix for 40min at 1000rpm. The mechanically mixed powder was calcined in an oxygen-filled furnace at 550 °C for 3 h to obtain Al(PO 3 ) 3 Coated NCM622 cathode material.

[0059] The material obtained in Example 3 is made into a positive electrode of a lithium ion battery, packed into a half battery, and tested for 100 cycles of electrochemical performance at 2.8-4.3 V, 1C, and the results are as follows: Figure 4 shown.

[0060] The material obtained in Example 3 has a capacity of 164.54mA·h / g after 100 cycles at 1C, and the cycle retention rate is 98.35%.

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Abstract

The invention provides a preparation method of a metaphosphate-containing lithium ion battery positive electrode material. The preparation method of the metaphosphate-containing lithium ion battery positive electrode material comprises the following steps: mixing a lithium-containing oxide with dihydric phosphate, and calcining in an oxidizing atmosphere to obtain the lithium ion battery positiveelectrode material, wherein the general formula of the lithium-containing oxide is Li Ni Co < c > Mn < d > X < 1-b-c-d > O < 2 >, and X comprises one or more of Al, Mg and Zr. The preparation method of the metaphosphate-containing lithium ion battery positive electrode material provided by the invention is good in coating effect, few in coating impurities and simple in preparation method, and the lithium ion battery prepared from the metaphosphate-containing lithium ion battery positive electrode material is good in cycle performance and safety.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing a positive electrode material of a lithium ion battery containing metaphosphate. Background technique [0002] With the rapid development of new energy vehicles, more and more electric vehicles have begun to enter the lives of ordinary consumers. Range and service life have been major concerns. As the cruising range of electric vehicles continues to catch up with fuel vehicles, the accidents of vehicle fires and explosions remind people that more and more attention should be paid to the safety of vehicles. [0003] As the main part of the battery, the structural instability of the ternary cathode material is an important aspect affecting the performance of the battery. The surface structure of the ternary material is prone to excessive delithiation, which makes the layered structure of the material change to a spinel structure and an inert rock salt p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 石崇福王卓邓多罗桂唐泽勋商士波
Owner SOUNDON NEW ENERGY TECH CO LTD
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