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Positive material, positive plate and lithium ion battery

A technology of positive electrode material and positive electrode sheet, which is applied in the field of positive electrode sheet, lithium ion battery and positive electrode material, and can solve problems such as poor safety

Inactive Publication Date: 2018-11-09
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many companies are willing to use ternary lithium batteries because of their high energy density and sufficient supply, but it is an indisputable fact that their safety is not good.

Method used

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  • Positive material, positive plate and lithium ion battery
  • Positive material, positive plate and lithium ion battery
  • Positive material, positive plate and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0064] Examples 1-3 were all prepared according to the raw materials and proportions in Table 1 to obtain lithium ion batteries. Wherein, the active material in embodiment 1~3 is lithium nickel cobalt manganese oxide LiNi 0.6 co 0.2 mn 0.2 o 2 and lithium manganese iron phosphate LiMn 0.75 Fe 0.25 PO 4 The mixture of the specific dosage ratio is shown in Table 1.

[0065] Among them, the D50 of lithium manganese iron phosphate is 5.0 μm, and the specific surface area is 25m 2 / g; the D50 of the ternary material is 10.0μm, and the specific surface area is 0.37m 2 / g.

Embodiment 4

[0069] An 8Ah flexible package battery was prepared according to the method in Example 1, except that the positive and negative electrodes of the battery were prepared according to the raw material ratio in Table 2.

[0070] Among them, the ternary material is lithium nickel cobalt aluminate (NCA, LiNi 0.8 co 0.15 al 0.05 o 2 )), particle size D50 is 10.0μm, specific surface area is 0.37m 2 / g; lithium manganese iron phosphate (LMFP, LiMn 0.75 Fe 0.25 PO 4 )D50 is 5.0μm, specific surface area is 25m 2 / g.

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Abstract

The invention provides a positive material, which is prepared from lithium manganese iron phosphate and a ternary material, wherein lithium manganese iron phosphate is LiMnzFe1-zPO4, and wherein z ismore than or equal to 0.6 and less than or equal to 0.9; the ternary material is lithium nickel cobalt manganate and / or lithium nickel cobalt aluminate; the D50 of lithium manganese iron phosphate is3.6-6.5mu m; the D50 of lithium nickel cobalt manganate is 8.5-11.0mu m; the D50 of lithium nickel cobalt aluminate is 10.0-14.0mu m; the D50 of the ternary material is 1.5-2.5 times that of lithium manganese iron phosphate. The ternary material is surrounded by the lithium manganese iron phosphate material, so that the heat release amount of the positive material is reduced, the ignition point ofthe positive material is increased, and the safety performance of a battery can be improved; furthermore, the cycle performance of the battery is improved. The invention also provides a positive plate and a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode material, a positive electrode sheet and a lithium ion battery. Background technique [0002] On January 24, 2016, the China Chemical and Physical Power Supply Industry Association issued a report. According to the opinions of various parties, it was concluded that the application of ternary power lithium-ion batteries in passenger cars was suspended, and the China Machine Center suspended the acceptance of ternary batteries. The power lithium-ion battery bus is included in the promotion catalog of new energy vehicles. The Ministry of Industry and Information Technology will organize an assessment of the risks of ternary lithium-ion battery buses and other vehicles under the current safety standard system. Before the completion of the evaluation, the ternary lithium-ion battery buses will be suspended from being included in the list...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M4/131H01M4/136H01M10/0525
CPCH01M4/131H01M4/136H01M4/362H01M4/485H01M4/505H01M4/525H01M4/5825H01M10/0525H01M2220/20Y02E60/10
Inventor 贺志龙刘兆平田爽
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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