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Positive electrode active material, positive electrode plate and lithium ion secondary battery

A positive electrode active material, positive electrode sheet technology, applied in secondary batteries, active material electrodes, positive electrodes, etc., can solve the problems of poor high temperature cycle performance of lithium ion secondary batteries, and achieve improved structural stability and high temperature cycle stability. properties, improved deformation resistance, high charge-discharge voltage and specific capacity characteristics

Active Publication Date: 2021-03-05
CONTEMPORARY AMPEREX TECH CO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium-nickel-based positive electrode active materials have a high theoretical capacity, and lithium-ion secondary batteries using lithium-nickel-based positive electrode active materials can be expected to obtain higher energy density, but studies have found that the high-temperature cycle performance of this kind of lithium-ion secondary batteries is relatively low. Difference

Method used

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  • Positive electrode active material, positive electrode plate and lithium ion secondary battery
  • Positive electrode active material, positive electrode plate and lithium ion secondary battery
  • Positive electrode active material, positive electrode plate and lithium ion secondary battery

Examples

Experimental program
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preparation example Construction

[0077] Next, a method for preparing a cathode active material is schematically illustrated. According to the preparation method, any one of the positive electrode active materials mentioned above can be prepared. Preparation methods include:

[0078] The positive electrode active material precursor, the lithium source and the dopant element precursor are mixed and sintered to obtain the positive electrode active material.

[0079] The above-mentioned positive electrode active material precursor can be one or more of oxides, hydroxides and carbonates containing Ni and optionally Co and / or Mn according to the stoichiometric ratio, for example, containing Ni according to the stoichiometric ratio. Hydroxide of Ni, Co and Mn.

[0080] The positive electrode active material precursor can be obtained by methods known in the art, for example, prepared by co-precipitation method, gel method or solid phase method.

[0081] As an example, the Ni source, the Co source and the Mn source...

Embodiment 1

[0123] Preparation of cathode active material

[0124] The doping element is Sb, and the precursor of the doping element is antimony oxide (Sb 2 o 3 ) roughly equally divided into 3 batches for Sb doping. Preparation methods include:

[0125] The cathode active material precursor [Ni 0.8 co 0.1 mn 0.1 ](OH) 2 , Lithium hydroxide LiOH and the first batch of antimony oxide are added in a high-speed mixer and mixed for 1h to obtain a mixed material, wherein the molar ratio Li / Me of the positive electrode active material precursor to lithium hydroxide is 1.05, and Me represents The total molar amount of Ni, Co, and Mn in the positive active material precursor; put the mixed material into the atmosphere sintering furnace for the first sintering, the sintering temperature is 830°C, the sintering time is 5h, and the sintering atmosphere is O 2 An atmosphere containing oxygen at a concentration of 90%.

[0126] The product of the first sintering treatment and the second batc...

Embodiment 2～13 and Embodiment 16～24

[0139] The difference from Example 1 is that the relevant parameters in the preparation steps of the positive electrode active material are changed, the oxide of the doping element is selected as its source, and the content of each batch when the doping element is mixed, and the sintering temperature is 800 ° C ~ 850 ° C, the total The sintering time is 15h-25h, and the positive electrode active material with predetermined doping element type, doping amount and doping uniformity is obtained, see Table 1 and Table 2 for details.

[0140] In Example 4 and Example 12 involving multi-element doping, the content of each doping element is basically the same.

[0141] And the positive electrode active material precursor in the embodiment 22~24 is [Ni 0.5 co 0.2 mn 0.3 ](OH) 2 .

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Abstract

The invention discloses a positive electrode active material, a positive electrode plate and a lithium ion secondary battery. The positive electrode active material comprises secondary particles formed by aggregation of primary particles, the primary particles are lithium transition metal oxides, and transition metal sites of the lithium transition metal oxides comprise nickel and doping elements;and the Young's modulus E of the primary particles satisfies 175 GPa < = E < = 220 GPa. By adopting the positive electrode active material provided by the invention, the lithium ion secondary batterycan have relatively high energy density and high-temperature cycle performance at the same time.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a positive electrode active material, a positive electrode sheet and a lithium ion secondary battery. Background technique [0002] Lithium-ion secondary battery is a kind of rechargeable battery, which mainly relies on the movement of lithium ions between the positive electrode and the negative electrode to work, and is currently widely used as a clean energy source. As an important part of the lithium ion secondary battery, the positive electrode active material provides lithium ions that reciprocate on the positive and negative electrodes during the charging and discharging process of the battery. Therefore, the positive electrode active material is very important for the performance of the battery. [0003] Lithium-nickel-based positive electrode active materials have a high theoretical capacity, and lithium-ion secondary batteries using lithium-nickel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/505H01M4/525H01M10/0525
CPCH01M4/131H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10C01G53/50C01P2006/11C01P2006/12C01P2004/61C01P2002/54C01P2006/10C01P2006/40
Inventor 钭舒适胡春华蒋耀吴奇何金华邓斌
Owner CONTEMPORARY AMPEREX TECH CO
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