The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 2024
Filed:
May. 28, 2019
South China University of Technology, Guangzhou, CN;
Sihui Dabowen Industrial Co., Ltd., Zhaoqing, CN;
Guangdong Research Institute of Rare-metal, Guangzhou, CN;
Liuzhang Ouyang, Guangzhou, CN;
Cheng Tan, Guangzhou, CN;
Min Zhu, Guangzhou, CN;
De Min, Zhaoqing, CN;
Hui Wang, Guangzhou, CN;
Tongzhao Luo, Zhaoqing, CN;
Fangming Xiao, Guangzhou, CN;
Renheng Tang, Guangzhou, CN;
South China University of Technology, Guangzhou, CN;
Sihui Dabowen Industrial Co., Ltd., Zhaoqing, CN;
Guangdong Research Institute of Rare-Metal, Guangzhou, CN;
Abstract
The present invention relates to a hydrogen storage alloy, an electrode for a Ni-MH battery, a secondary battery, and a method for preparing the hydrogen storage alloy. The chemical composition of the hydrogen storage alloy is expressed by the general formula LaCeZrSmNiCoMnAl, where x, y, z, u, v, w are molar ratios, and 0.14≤x≤0.17, 0.02≤y≤0.03, 4.60≤z+u+v+w≤5.33, 0.10≤u≤0.20, 0.25≤v≤0.30, and 0.30≤w≤0.40. The atomic ratio of the metal lanthanum (La) to the metal cerium (Ce) is fixed at 3.0 to 3.2, which satisfies the requirements of the overcharge performance of the electrode material. A side elements are largely substituted by samarium (Sm) element, that is, the atomic ratio of Sm on the A side is 25.6% to 42%, so as to solve the problem of shortened cycle life caused by the small amount of cobalt (Co) atoms. The equilibrium pressure is adjusted by the change in the ratio of Sm to La and Ce to satisfy the requirements of the charge and discharge dynamic performance of the electrode material. The nucleation rate of the solidification process is improved by the addition of zirconium (Zr) to the A side at an atomic ratio of 2% to 3%. The Ni-MH battery negative-electrode material obtained from the hydrogen storage alloy has high overcharge resistance, and good high-rate discharge performance and cycle stability.