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Five-element lithium ion battery positive electrode material, preparation method and lithium battery made therefrom

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems affecting material cycle and rate performance, Li ion transmission channel is blocked, metal element valence effects, etc., to improve cycle stability performance, guaranteed rate performance, and anti-oxidation effect

Active Publication Date: 2021-10-22
WANHUA CHEM GRP CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the inventors of the present invention creatively found that with the introduction of added elements, the valence of metal elements (NiCoMn) in the original ternary material will be affected, and the arrangement of atoms in the material and the composition of O and Li will be affected to a certain extent. distribution, which may lead to more serious mixing of metal elements, or block the transmission channel of Li ions, which will eventually affect the cycle and rate performance of the material.
The reason is that the average valence state of the introduced element and the metal element in the ternary material is inconsistent, which will lead to a change in the valence state of Ni-Co-Mn in the ternary material, which in turn leads to a decrease in the capacity of the ternary material, or even Cause more serious structural defects and instability

Method used

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  • Five-element lithium ion battery positive electrode material, preparation method and lithium battery made therefrom
  • Five-element lithium ion battery positive electrode material, preparation method and lithium battery made therefrom
  • Five-element lithium ion battery positive electrode material, preparation method and lithium battery made therefrom

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preparation example Construction

[0032] A preparation method of a five-element lithium-ion battery positive electrode material, comprising the following steps:

[0033]First, the precursor material containing five metal elements including A, B elements and Ni, Co, and Mn elements is synthesized by co-precipitation method, and then the precursor and lithium salt are fully mixed and uniformly mixed, and the uniformly mixed powder is placed in air / oxygen It can be obtained by sintering under atmosphere, and then coating and secondary sintering. The chemical formula of the synthesized five-element cathode material is Li(NiCoMn) x A y B z o 2 , where x≥0.98. For the ratio of A and B elements, where (3-A valence)*y=(B valence-3)*z, while x+y+z=1.

[0034] In a preferred embodiment, the five-element cathode material Li(NiCoMn) x A y B z o 2 The ratio of Ni, Co, and Mn elements is not limited in any way, for example, it can be common ratios such as 111 / 424 / 523 / 622 / 811, but it is not limited thereto, for exam...

Embodiment 1

[0049] Lithium-ion battery quinary cathode material Li(Ni) of the present embodiment 0.83 co 0.12 mn 0.05 ) 0.99 Mg 0.005 Zr 0.005 o 2 The preparation method of battery thereof, comprises the following steps:

[0050] 1) Add MgSO in the reactor at the molar ratio Zr:Mg=1:1 4 and ZrO 2 (20nm) in aqueous solution and dispersed for 10min. Simultaneously calculate and weigh soluble nickel sulfate, soluble cobalt sulfate, The amount of soluble manganese sulfate.

[0051] 2) The above substances were added together into deionized water for mixing to prepare a solution with a metal concentration of 2 mol / L, while the reaction temperature was adjusted to 60°C, and ammonia water was injected to keep the ammonia concentration at 0.5 mol / L.

[0052] 3) The above solution was injected into 2mol / L NaOH solution to adjust the pH to be stable at about 11.5, and the stirring speed was 500 rpm, and reacted for 15 hours under the conditions of temperature and pH.

[0053] 4) The prec...

Embodiment 2

[0060] Lithium-ion battery quinary cathode material Li(Ni) of the present embodiment 0.83 co 0.12 mn 0.05 ) 0.98 Sr 0.01 Ti 0.01 o 2 The preparation method of battery thereof, comprises the following steps:

[0061] 1) Add SrSO in the reactor at a molar ratio of Sr:Ti=1:1 4 and TiO 2 (20nm) in aqueous solution and dispersed for 10min. Simultaneously calculate and weigh soluble nickel sulfate, soluble cobalt sulfate, The amount of soluble manganese sulfate.

[0062] 2) The rest of the implementation steps are consistent with 2)-9) steps in Example 1, except that the elements and molar ratios are different, and there are no changes. Finally, the target quinary product Li(Ni 0.83 co 0.12 mn 0.05 ) 0.98 Sr 0.01 Ti 0.01 o 2 .

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Abstract

The invention discloses a five-element lithium ion battery positive electrode material with equal valence ratio, high stability and long cycle, a preparation method and a lithium battery made thereof. The five-element positive electrode material has the following structure: Li(NiCoMn) x A y B z o 2 , wherein x≥0.98, the A element includes one of Mg and Sr elements, and the B element is one of Zr, Ti, W elements, and the ratio of A and B elements needs to satisfy the following equation: (3-A valence )*y=(B valence-3)*z, while x+y+z=1. Compared with the traditional ternary and other non-equal ratio system materials, the positive electrode material of the quinary lithium ion battery of the present invention has higher structural stability, significantly improved cycle performance; fewer material defects, and lower Li / Ni mixing , with better rate performance.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery, a preparation method and a lithium ion battery made thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] With the development of new energy vehicles, the total domestic production of EV passenger vehicles in 2019 was 843,362 units, a year-on-year increase of 12.1%. The market share of EV passenger vehicles reached 71.7%, an increase of 10% compared to 61.6% in 2018. It can be seen that the main models in the domestic new energy vehicle market are pure electric passenger vehicles, and judging from the increase in market share, there is still room for growth of pure electric passenger vehicles in the future. [0003] The ternary cathode material refers to lithium nickel cobalt manganate (Li(NiCoMn)O 2 ), is a layered nickel-cobalt-manganese ternary composite positive electrode material, which is prepared from nickel salt, cobalt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 韩玉振张洁
Owner WANHUA CHEM GRP CO LTD
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