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

A technology of positive electrode active materials and secondary particles, 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 performance, improve deformation resistance, and prevent cracking

Active Publication Date: 2022-03-15
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
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  • Application Information

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

Examples

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preparation example Construction

[0077] Next, a method of preparing a positive electrode active material will be described next. Any of the above positive electrode active materials can be prepared according to the preparation method. Preparation methods include:

[0078] The positive electrode active material precursor, lithium source, and doped element precursors were mixed, and the sintering treatment was performed to obtain a positive electrode active material.

[0079] The positive electrode active material precursor may be one or more of the compounds containing Ni and optionally Co and / or Mn, for example, in accordance with the chemical metering ratio. Hydroxides of Ni, CO, and Mn.

[0080] The positive electrode active material precursor can be obtained by a method known in the art, such as by a co-precipitation method, a gel method or a solid phase method.

[0081] As an example, the Ni source, the CO source and the Mn source are dispersed in a solvent to obtain a mixed solution; the mixed solution, a ...

Embodiment 1

[0123] Preparation of positive active materials

[0124] Doping element is Sb, the doping element precursor antimony oxide (Sb 2 O 3 ) Roughly divided into three batches of Sb doping. Preparation methods include:

[0125] The positive electrode active material precursor [Ni 0.8 CO 0.1 Mn 0.1 ] (OH) 2 , Lithium hydroxide LiOH and second batches of antimony trioxide was added 1-speed mixer for compounding IH, to give mixed material, wherein the positive electrode active material precursor with lithium hydroxide in a molar ratio of Li / Me is 1.05, Me represents the positive electrode active material precursor in the total molar amount of Ni, Co, Mn; and sintering the mixed material into an atmosphere furnace for first firing, a sintering temperature of 830 ℃, sintering time is 5h, the sintering atmosphere is O 2 A concentration of 90% oxygen-containing atmosphere.

[0126] The first firing process and the second batch of the product of antimony oxide added high-speed mixer for comp...

Embodiment 2～13 and Embodiment 16～24

[0139] Unlike Example 1, the positive electrode active material preparing step change in the parameters, selected doping element oxide as its source, and to adjust the respective quantities of doping elements mixed content, the sintering temperature of 800 ℃ ~ 850 ℃, total the sintering time 15h ~ 25h, to obtain a predetermined doping element type, doping uniformity and doping amount of the positive electrode active material, in table 1 and table 2.

[0140] Relates to a multi-element-doped Example 4 and Example 12, each of the doping element content is substantially the same.

[0141] And a positive electrode active material precursor of Examples 22 to 24 [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 sheet and a lithium ion secondary battery. The positive electrode active material includes secondary particles formed by gathering primary particles, the primary particles are lithium transition metal oxides, and the lithium transition metal oxides The transition metal sites include nickel and doping elements; and the Young's modulus E of the primary particles is 175GPa≤E≤220GPa. By adopting the cathode active material provided by the invention, the lithium-ion secondary battery can simultaneously take into account higher energy density and high-temperature cycle performance.

Description

Technical field [0001] The invention belongs to the technical field of secondary battery, and more particularly to a positive electrode active material, a positive electrode plate, and a lithium ion secondary battery. Background technique [0002] The lithium ion secondary battery is a rechargeable battery, which relies mainly on the movement between the lithium ions between the positive and negative electrodes, and is the current cleaning energy currently widely used. The positive electrode active material is an important part of the lithium ion secondary battery, providing a battery charge and discharge process to lithium ions that are positive and negative reciprocating movements, so the positive electrode active material is critical to the performance of the battery. [0003] The lithium nickel-based positive electrode active material has a high theoretical capacity, and the lithium ion secondary battery using a lithium nickel-based positive electrode active material can expe...

Claims

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Application Information

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Patent Type & Authority Patents(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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