Solid electrolyte, method for preparing same, and rechargeable lithium battery comprising solid electrolyte and solid electrolyte particles

Patent metadata

Field	Value
Publication number	US-9577285-B2
Application number	US-201113244106-A
Country	US
Kind code	B2
Filing date	Sep 23, 2011
Priority date	Oct 15, 2010
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

Disclosed is a solid electrolyte including particles comprising Li (1+x) Ti (2-x) Al x (PO 4 ) 3 (0≦x≦1) having a true density of about 2.20 to about 2.50 g/cm 3 .

First claim

What is claimed is:

1. A solid electrolyte comprising:
particles comprising Li (1+x) Ti (2-x) Al x (PO 4 ) 3 (0.3≦x≦1) having a true density of 2.20 g/cm 3 to 2.50 g/cm 3 ;
wherein the Li (1+x) Ti (2-x) Al x (PO 4 ) 3 (0.3≦x≦1) particle is formed by a sol-gel method;
wherein the method includes:
mixing a first mixed solution with a second mixed solution to provide a mixture, the first mixed solution including a lithium source material and a PO 4 source material, and the second mixed solution including alcohol, a chelating agent and titanium alkoxide,
heating the mixture at about 40° C. to about 80° C. to provide a chelate/metal sol;
heating the chelate/metal sol at about 200° C. to about 300° C. to provide a gel precursor; and
firing the gel precursor at about 650° C. to about 950° C.; and further

wherein the chelating agent in the second mixed solution may be at least one of ammonia, ethylene diamine, acetic acid, or acetyl acetone; and further
wherein the primary particle synthesized by the sol-gel method has a particle size distribution at 50%-point accumulation ranging from about 250 nm to about 500 nm, and a particle size distribution at 90%-point accumulation ranging from about 350 nm to about 700 nm; and
wherein the solid electrolyte has an ionic conductivity of about 2.33×10 −4 S/cm to about 2.43×10 −4 S/cm at a temperature of about 25° C.

2. The solid electrolyte of claim 1 , wherein the Li (1+x) Ti (2-x) Al x (PO 4 ) 3 (0.3≦x≦1) particles have a percentage of true density to the theoretical density ranging from about 77 volume % to about 80 volume %.

3. The solid electrolyte of claim 1 , wherein the Li (1+x) Ti (2-x) Al x (PO 4 ) 3 (0.3≦x≦1) particles are in a powder.

4. A rechargeable lithium battery comprising
a negative electrode including a negative active material;
a positive electrode including a positive active material;
a solid electrolyte comprising particles comprising Li (1+x) Ti (2-x) Al x (PO 4 ) 3 (0.3≦x≦1) having a true density of 2.20 g/cm 3 to 2.50 g/cm 3 ;
wherein the Li (1+x) Ti (2-x) Al x (PO 4 ) 3 (0.3≦x≦1) particle is formed by a sol-gel method;
wherein the method includes:
mixing a first mixed solution with a second mixed solution to provide a mixture, the first mixed solution including a lithium source material and a PO4 source material, and the second mixed solution including alcohol, a chelating agent and titanium alkoxide,
heating the mixture at about 40° C. to about 80° C. to provide a chelate/metal sol;
heating the chelate/metal sol at about 200° C. to about 300° C. to provide a gel precursor; and
firing the gel precursor at about 650° C. to about 950° C.; and further

wherein the chelating agent in the second mixed solution may be at least one of ammonia, ethylene diamine, acetic acid, or acetyl acetone; and further
wherein the primary particle synthesized by the sol-gel method has a particle size distribution at 50%-point accumulation ranging from about 250 nm to about 500 nm, and a particle size distribution at 90%-point accumulation ranging from about 350 nm to about 700 nm; and
wherein the solid electrolyte has an ionic conductivity of about 2.33×10 −4 S/cm to about 2.43×10 −4 S/cm at a temperature of about 25° C.

5. The rechargeable lithium battery of claim 4 , wherein the Li (1+x) Ti (2-x) Al x (PO 4 ) 3 (0.3≦x≦1) particles have a percentage of true density to the theoretical density ranging from about 77 volume % to about 80 volume %.

6. The rechargeable lithium battery of claim 4 , wherein the Li (1+x) Ti (2-x) Al x (PO 4 ) 3 (0.3≦x≦1) particles are in a powder.

Assignees

• Chu Hee-Young
• Moon Sung-Hwan
• Matulevich Yuri
• Kim Jae-Hyuk
• Jeong Myung-Hwan
• Jeong Chang-Ui
• Choi Jong-Seo
• Andreev Oleg Leonidovith
• Samsung Sdi Co Ltd

Inventors

• Chu Hee-Young
• Moon Sung-Hwan
• Matulevich Yuri
• Kim Jae-Hyuk
• Jeong Myung-Hwan
• Jeong Chang-Ui
• Choi Jong-Seo
• Andreev Oleg Leonidovith

Classifications

• C01B25/45

  containing plural metal, or metal and ammonium · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M10/0562

  Solid materials · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic