Electrode with flame retardant additives and method and systems for preparation and use

Patent metadata

Field	Value
Publication number	US-2021391578-A1
Application number	US-201917286430-A
Country	US
Kind code	A1
Filing date	Oct 11, 2019
Priority date	Oct 22, 2018
Publication date	Dec 16, 2021
Grant date	—

Abstract

Methods and systems are provided for an electrode active material for lithium ion batteries. In one example, the electrode active material may include a lithium mixed metal oxide core and flame-retardant dusting particles partially retained within a surface of the core. In some examples, the dusting particles may have an average size of less than 20 μm. In some examples, the amount of dusting particles by weight may be greater than 0.1% of the core particles and less than 50% of the core particles. In another example, methods are provided for manufacturing the electrode active material for use in a lithium ion battery, where lithium metal composite core particles may be mixed with the flame-retardant dusting particles in a dry process.

First claim

1 . An electrode active material for a lithium ion battery, the electrode active material comprising:
a lithiated compound core; and flame-retardant dusting particles partially retained within a surface of the lithiated compound core, where the flame-retardant dusting particles have an average size of less than 20 p.m, and where an amount of the flame-retardant dusting particles by weight is greater than 0.1% of the electrode active material and less than 50% of the electrode active material.

2 . The electrode active material of claim 1 , wherein the lithiated compound core is a lithium intercalation compound, a lithium metal oxide, a lithium metal phosphate, or a combination thereof.

3 . The electrode active material of claim 1 , wherein the lithiated compound core is one of NMC, NCA, NCMA, and LFP.

4 . The electrode active material of claim 1 , wherein the flame-retardant dusting particles are composed of one or more of zinc borate, magnesium hydroxide, magnesium oxide, magnesium carbonate, magnesium hydrogen carbonate, aluminum hydroxide, aluminum oxide, aluminum hydroxide oxide, antimony oxide, ammonium sulfate, ammonium carbonate, urea, and polyacrylonitrile.

5 . The electrode active material of claim 4 , wherein the flame-retardant dusting particles are composed of aluminum hydroxide.

6 . The electrode active material of claim 1 , wherein the electrode active material is included in a cathode.

7 . The electrode active material of claim 1 , wherein the electrode active material is included in an anode.

8 . The electrode active material of claim 1 , wherein a height of the flame-retardant dusting particles from the surface of the lithiated compound core varies along the surface of the lithiated compound core.

9 . A method for manufacturing an electrode active material, the method comprising:
preparing each of a core powder comprised of one or more electrochemically active materials and a dusting powder comprised of one or more flame-retardant materials; and mixing the core powder with greater than 0.1% by weight of the dusting powder and less than 50% by weight of the dusting powder, such that the dusting powder is partially retained within a surface of the core powder.

10 . The method of claim 9 , wherein the core powder is one or more of LiMeO 2 and LiMePO 4 , where Me is one or more elements selected from Ni, Mn, Co, Al, Mg, Y, Nd, B, Ca, V, Fe, Ga, Nb, Cr, Mo, W, Tc, Ru, Rh, Ir, Pd, Cu, Ge, Si, In, Ag, Cd, and Zn.

11 . The method of claim 9 , wherein the core powder is NMC, NCA, NCMA, or LFP.

12 . The method of claim 9 , wherein the core powder is in the form of particles having an average size of 0.1 to 20 μm.

13 . The method of claim 9 , wherein the one or more flame-retardant materials include zinc borate, magnesium hydroxide, magnesium oxide, magnesium carbonate, magnesium hydrogen carbonate, aluminum hydroxide, aluminum oxide, aluminum hydroxide oxide, antimony oxide, ammonium sulfate, ammonium carbonate, urea, and polyacrylonitrile.

14 . The method of claim 9 , wherein the mixing is a dry mixing.

15 . The method of claim 9 , wherein the mixing is a wet mixing.

16 . The method of claim 9 , wherein a coverage of the dusting powder on the core powder is greater than 50% of a surface area of the core powder and less than 90% of the surface area of the core powder.

17 . A lithium ion battery, comprising:
a positive electrode comprising:
a dusted lithium active material, where the dusted lithium active material includes a lithium active core with dusting particles partially covering a surface of the lithium active core and extending partially into the lithium active core, the dusting particles having an average size of less than 5 μm;
a negative electrode comprising at least lithium metal; and an electrolyte.

18 . The lithium ion battery of claim 17 , wherein the dusting particles are composed of one or more of zinc borate, magnesium hydroxide, magnesium oxide, magnesium carbonate, magnesium hydrogen carbonate, aluminum hydroxide, aluminum oxide, aluminum hydroxide oxide, antimony oxide, ammonium sulfate, ammonium carbonate, urea, and polyacrylonitrile.

19 . The lithium ion battery of claim 17 , wherein the dusting particles are greater than 0.1 wt % of the dusted lithium active material and less than 5 wt % of the dusted lithium active material.

20 . The lithium ion battery of claim 17 , wherein the lithium active core is NMC, NCA, NCMA, or LFP.

Assignees

• A123 Systems Llc

Inventors

• Wang Lixin
• Zhou Weidong
• Chen Yao
• Harrison Chloe
• Zhou Fu
• Kim Kitae
• Wang Jun
• Johnson Derek C

Classifications

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/62 Primary

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M4/366

  as layered products · CPC title

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title