US 12,278,369 B2
Lithium ion battery for power tools
Aditya Subramanian, Hong Kong (CN); and Denis Gaston Fauteux, Hong Kong (CN)
Assigned to Techtronic Cordless GP, Anderson, SC (US)
Appl. No. 17/633,236
Filed by TECHTRONIC CORDLESS GP, Anderson, SC (US)
PCT Filed May 27, 2020, PCT No. PCT/CN2020/092598
§ 371(c)(1), (2) Date Feb. 7, 2022,
PCT Pub. No. WO2021/031647, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 19128447.0 (HK), filed on Aug. 20, 2019.
Prior Publication US 2022/0376248 A1, Nov. 24, 2022
Int. Cl. H01M 4/583 (2010.01); H01M 4/02 (2006.01); H01M 4/38 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/583 (2013.01) [H01M 4/386 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01); H01M 2220/30 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A lithium ion battery for use in a power tool, comprising:
a carbon-based negative electrode containing a weight content of silicon-based material;
a positive electrode including one or more lithium metal oxides containing nickel to form a core shell gradient, the one or more lithium metal oxides comprising an LiaNixAyBzO2 formulation, and the core shell gradient including at least a first layer having a ratio of x, y and z being 0.8:0.1:0.1, a second layer having a ratio of x, y and z being 0.6:0.2:0.2 and a third layer having a ratio of x, y and z being ⅓: ⅓: ⅓, the first layer being an innermost layer and the third layer being an outermost layer; and
an ionic liquid (IL) electrolyte placed between the negative electrode and the positive electrode,
wherein the weight content of silicon-based material in the negative electrode is no less than 5%.