High-compaction-density positive electrode material and electrochemical energy storage device

A positive electrode material and chemical formula technology, applied in the field of high compaction density positive electrode materials and electrochemical energy storage devices, can solve the problems of low gram capacity, low energy density of positive electrode materials, serious gas production, etc.

Active Publication Date: 2020-07-07
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is usually used in low-nickel ternary materials, and its gram capacity is low, resulting in low energy density of positive electrode materials
A small number of high-nickel polycrystals with large particles mixed with high-nickel polycrystals with small particles have a high energy density, but the small-grain high-nickel p

Method used

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  • High-compaction-density positive electrode material and electrochemical energy storage device
  • High-compaction-density positive electrode material and electrochemical energy storage device
  • High-compaction-density positive electrode material and electrochemical energy storage device

Examples

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preparation example Construction

[0052] The second aspect of the present invention provides the preparation method of the cathode material of the first aspect of the present invention, comprising:

[0053] Provide lithium nickel transition metal oxide A;

[0054] Provide lithium nickel transition metal oxide B;

[0055] Lithium nickel transition metal oxide A and lithium nickel transition metal oxide B were mixed.

[0056]In the preparation method of the positive electrode material provided by the present invention, the lithium nickel transition metal oxide A and / or the lithium nickel transition metal oxide B can be surface-modified, for example, the lithium nickel transition metal oxide A and / or Or lithium nickel transition metal oxide B is respectively surface modified, and then mixed, wherein the surface modification methods of lithium nickel transition metal oxide A and lithium nickel transition metal oxide B can be the same or different; lithium nickel can also be The transition metal oxide A and the l...

Embodiment 1

[0075] 1. Preparation of cathode materials

[0076] 1) Preparation of the precursors of lithium-nickel transition metal oxides A and B: nickel sulfate, manganese sulfate, and cobalt sulfate were prepared in a molar ratio into a 1mol / L solution, and a large particle size of 10 μm was prepared by hydroxide co-precipitation technology. Precursor of granular lithium nickel transition metal oxide A; nickel sulfate, manganese sulfate, and cobalt sulfate are configured into a 1mol / L solution in molar ratio, and a small particle lithium nickel transition metal with a particle size of 3 μm is prepared by hydroxide co-precipitation technology Precursor of oxide B. In the process of preparing the precursor, the particle size can be controlled by controlling the reaction time, pH value during co-precipitation, and ammonia concentration;

[0077] 2) Lithium nickel transition metal oxide A (polycrystalline LiNi 0.8 co 0.1 mn 0.1 o 2 ) preparation method:

[0078] The precursor Ni of t...

Embodiment 2

[0097] Compared with Example 1, the difference lies in the preparation method of the positive electrode material: the precursor particle size of the lithium nickel transition metal oxide B is 4 μm, the surface modified lithium nickel transition metal oxide A and the surface modified lithium nickel transition metal The mass ratio of oxide B is 7:3.

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Abstract

The invention relates to the technical field of batteries. The invention relates to a cathode material, in particular to a high-compaction-density cathode material and an electrochemical energy storage device. The positive electrode material comprises a lithium-nickel transition metal oxide A and a lithium-nickel transition metal oxide B. The lithium-nickel transition metal oxide A is secondary particles, and the chemical formula of the lithium-nickel transition metal oxide A is shown as a formula I: Lia1(Nib1Coc1Mnd1)x1M1-x1O2-e1Xe1, the lithium-nickel transition metal oxide B is of a singlecrystal structure or a single crystal-like structure, and the chemical formula of the lithium-nickel transition metal oxide B is shown as a formula II: Lia2(Nib2Coc2Mnd2)x2M'1-x2O2-e2X'e2 (II), and the grain size D104 of the positive electrode material and the particle size distribution change rate [delta] PSD of the positive electrode material meet the condition that D104 * [delta]PSD is more than or equal to 50 nm and less than or equal to 600 nm. The positive electrode material comprises the large-particle lithium-nickel transition metal oxide A and the small-particle lithium-nickel transition metal oxide B, so that the energy density of the battery is improved; by regulating and controlling the crystallinity and particle size distribution of the mixed positive electrode material, the problem of particle breakage of high-nickel powder in the cold pressing and circulating process is solved, the powder compaction density of the high-nickel active material is improved, and it is guaranteed that the gas production rate is low and the circulating performance is excellent.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a high compacted density positive electrode material and an electrochemical energy storage device. Background technique [0002] In order to pursue high energy density, cathode materials are generally optimized from two aspects. On the one hand, the nickel content of the positive electrode material is increased to increase its reversible gram capacity; on the other hand, the powder compaction density is increased through the combination of large and small particles. At present, high-nickel ternary materials have high reversible gram capacity, but do not have high powder compaction density. [0003] At present, there are two common schemes for high powder compaction density. One is large-grain polycrystals mixed with small-grain polycrystals. This method is usually used in low-nickel ternary materials, and its gram capacity is low, resulting in low energy density of the posit...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525H01M4/36Y02E60/10H01M4/131H01M4/1315H01M4/13915H01M4/1391H01M4/364H01M2004/028C01G53/50C01G53/006C01G53/42C01P2004/03C01P2006/40C01P2004/61C01P2004/51C01P2002/60C01P2006/12C01P2002/74H01M4/134H01M2004/021
Inventor 杜锐刘勇超赵德宇柳娜
Owner CONTEMPORARY AMPEREX TECH CO
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