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Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte storage batteries, secondary batteries, batteries, etc., can solve problems such as small pores

Pending Publication Date: 2021-01-19
TOYOTA JIDOSHA KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the secondary particles formed by simply aggregating the primary particles, there are pores between the primary particles, but the pores are small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7、 comparative example 1～5

[0104]

[0105] Dissolve nickel sulfate, cobalt sulfate, and manganese sulfate in water at a molar ratio of 5:2:3 to prepare a mixed solution containing metal components. On the other hand, a reaction liquid whose pH was adjusted using sulfuric acid and ammonia water was prepared in the reaction container. In addition, a pH adjustment solution obtained by mixing an aqueous sodium carbonate solution and an aqueous ammonium carbonate solution was prepared.

[0106] While controlling the pH with the pH adjusting liquid, the mixed liquid containing the metal component was added to the reaction liquid at a predetermined speed with stirring. After a predetermined time elapses, crystallization is completed. The crystals were washed with water, and then filtered and dried to obtain hydroxide particles, ie precursor particles. At this time, the pores formed in the precursor particles are controlled by changing the addition rate, pH, stirring rate, and reaction time of the mixed sol...

Embodiment 8～10、 comparative example 6～9

[0119]Precursor particles were produced in the same manner as above except that nickel sulfate, cobalt sulfate, and manganese sulfate were used in a molar ratio of 8:1:1. At this time, the pores formed in the precursor particles are controlled in the same manner as described above.

[0120] The obtained precursor particles and lithium carbonate were mixed so that the molar ratio of lithium to the total of nickel, cobalt, and manganese became 1.05. The mixture was calcined at 800° C. for 10 hours to obtain a lithium composite oxide (Li 1.05 Ni 0.8 co 0.1 mn 0.1 o 2 ).

[0121] The obtained lithium composite oxide was added to a mixed solution containing a metal component obtained by dissolving nickel sulfate, cobalt sulfate, and manganese sulfate in water at a molar ratio of 8:1:1, and obtained in the same manner as above except that A lithium composite oxide having a rock-salt structure layer on the surface. At this time, the thickness of the rock-salt structure layer i...

Embodiment 11～13、 comparative example 10～13

[0126] Precursor particles were produced in the same manner as above except that nickel sulfate, cobalt sulfate, and manganese sulfate were used in a molar ratio of 4:3:3. At this time, the pores formed in the precursor particles are controlled in the same manner as described above.

[0127] The obtained precursor particles and lithium carbonate were mixed so that the molar ratio of lithium to the total of nickel, cobalt, and manganese became 1.05. The mixture was fired at 950° C. for 10 hours to obtain a lithium composite oxide (Li 1.05 Ni 0.4 co 0.3 mn 0.3 o 2 ).

[0128] The obtained lithium composite oxide was added to a mixed solution containing a metal component obtained by dissolving nickel sulfate, cobalt sulfate, and manganese sulfate in water at a molar ratio of 4:3:3, and obtained in the same manner as above except that A lithium composite oxide having a rock-salt structure layer on the surface. At this time, the thickness of the rock-salt structure layer is ...

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Abstract

A non-aqueous electrolyte secondary battery that is obtained using a lithium composite oxide having a layered structure as a positive electrode active material and has a low initial resistance and anincrease in resistance after repeated charging and discharging is suppressed. The non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode includes a positive electrode active substance layer, which contains a lithium composite oxide having a layered structure. The lithium composite oxide is a porous particle. A surface of the porous particle includes a layer having a rock salt type structure. A thickness of the layer is not less than 5 nm and not more than 80 nm. A void ratio of the porous particle isnot less than 15% and not more than 48%. The porous particle contains two or more voids having diameters that are at least 10% of the particle diameter of the porous particle. The surface of the porous particle includes a coating of lithium tungstate.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, non-aqueous electrolyte secondary batteries such as lithium-ion secondary batteries have been favorably used in mobile power sources such as personal computers and portable terminals, electric vehicles (EV), hybrid vehicles (HV), plug-in hybrid Power supplies for driving vehicles such as automobiles (PHV), etc. [0003] In nonaqueous electrolyte secondary batteries, a positive electrode active material capable of absorbing and releasing ions as charge carriers is generally used. As an example of a positive electrode active material, a layered structure lithium composite oxide is mentioned (for example, refer patent document 1). [0004] Lithium composite oxides with a layered structure are generally in the form of secondary particles in which primary particles aggregate. In the secondary particles formed by simply aggregating t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/05H01M10/0525H01M10/0587
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M4/62H01M4/628H01M10/05H01M10/0525H01M10/0587H01M2220/20H01M2220/30H01M2004/028H01M4/366H01M4/1391H01M10/052Y02E60/10Y02P70/50H01M4/131H01M2004/021H01M2004/027
Inventor 山本雄治普洛克特桃子牧村嘉也林彻太郎黄嵩凯
Owner TOYOTA JIDOSHA KK
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