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Positive electrode active material for all-solid-state lithium ion batteries, positive electrode for all-solid-state lithium ion batteries, all-solid-state lithium ion battery, and method for producing positive electrode active material for all-solid-state lithium ion batteries

A cathode active material, lithium ion battery technology, applied in the direction of active material electrodes, solid electrolytes, lithium batteries, etc., to achieve the effect of improving electronic conductivity and good output characteristics

Pending Publication Date: 2021-03-02
JX NIPPON MINING & METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the case of lithium-ion batteries, the electrolyte solution is mostly organic compounds, and even if a flame-retardant compound is used, it cannot be said that there is no risk of fire at all.

Method used

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  • Positive electrode active material for all-solid-state lithium ion batteries, positive electrode for all-solid-state lithium ion batteries, all-solid-state lithium ion battery, and method for producing positive electrode active material for all-solid-state lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Manufacturing process of nuclear cathode active material

[0044] Commercially available nickel sulfate, cobalt sulfate, and manganese sulfate are made into an aqueous solution, mixed so that the molar ratio of Ni, Co, and M becomes a specified value, and coprecipitated with an alkali (sodium hydroxide) solution while fully stirring React, filter and wash. The reaction method is carried out according to a conventional method. Thereafter, the coprecipitation reactant was mixed with lithium hydroxide monohydrate so that the molar ratio of Li to the total of Ni, Co, and M (Li / (Ni+Co+M)) became a predetermined value, and the Firing in a roller hearth kiln (firing temperature 720°C, firing time 24 hours), crushing with a roll mill and a pulverizer to obtain a nuclear positive electrode with a particle size D50 of 4.5 μm substance.

[0045] (2) Covering process of nuclear positive electrode active material

[0046] with LiOC 2 h 5 and Nb(OC 2 h 5 ) 5 solution, us...

Embodiment 2

[0048] A positive electrode active material in which the core positive electrode active material was coated with lithium niobate and simple carbon was obtained in the same manner as in Example 1, except that the simple substance of carbon was covered with respect to Nb at 10 mol%.

Embodiment 3

[0050] A positive electrode active material in which the core positive electrode active material was coated with lithium niobate and simple carbon was obtained in the same manner as in Example 1, except that the simple substance of carbon was covered with respect to Nb at 50 mol%.

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Abstract

The present invention provides: a positive electrode active material for all-solid-state lithium ion batteries, said positive electrode active material being suppressed in the formation of a high resistance layer at the interface between itself and a sulfide solid electrolyte, while having improved electron conductivity and exhibiting good output characteristics if applied to an all-solid-state lithium ion battery; a positive electrode for all-solid-state lithium ion batteries using this positive electrode active material for all-solid-state lithium ion batteries; an all-solid-state lithium ion battery; and a method for producing a positive electrode active material for all-solid-state lithium ion batteries. A positive electrode active material for all-solid-state lithium ion batteries, said positive electrode active material comprising: a core positive electrode active material that has a composition represented by formula LiaNibCocMdO2 (wherein M represents at least one element selected from among Mn, V, Mg, Ti and Al; and 1.00 <=a <=1.02, 0.8 <=b <=0.9 and (b + c + d) = 1 are satisfied); and a cover part that is formed on the surface of the core positive electrode active material. The cover part sequentially comprises, from the surface of the core positive electrode active material, a layer of lithium niobate and a layer of carbon in this order.

Description

technical field [0001] The invention relates to a positive electrode active material for an all-solid lithium ion battery, a positive electrode for an all-solid lithium ion battery, an all-solid lithium ion battery, and a method for manufacturing the positive electrode active material for an all-solid lithium ion battery. Background technique [0002] In the currently used lithium ion batteries, the layered compound LiMeO is used as the positive electrode active material. 2 (Me is a cation selected so that it becomes +III valence on average, and must contain redox cations), spinel compound LiMeQO 4 (Q is a cation selected so that the average valence is +IV), olivine-based compound LiX 1 X 2 O 4 (X 1 is a cation selected so as to become +II valence, and must contain redox cations; X 2 is a cation selected so as to become +V valence), fluorite-type compound Li 5 MeO 4 etc., on the other hand, in order to fully exert its characteristics, the constituent elements such as ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/052H01M10/0562
CPCH01M2004/028H01M4/525H01M4/131H01M4/1391H01M4/366H01M10/0562H01M10/0525H01M2300/0068H01M2300/008H01M4/62H01M4/625Y02E60/10H01M4/505H01M10/052C01G53/44C01G33/00C01B32/05C23C14/0605C23C14/223
Inventor 樫村利英
Owner JX NIPPON MINING & METALS CO LTD
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