Taiheiyo Cement has been granted a patent for a positive-electrode active material for lithium-ion or sodium-ion secondary cells. The material, represented by formulas (A), (B), or (C), includes carbon derived from a cellulose nanofiber. The invention aims to improve charge/discharge characteristics. GlobalData’s report on Taiheiyo Cement gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Taiheiyo Cement, Artificial concrete aggregates was a key innovation area identified from patents. Taiheiyo Cement's grant share as of September 2023 was 29%. Grant share is based on the ratio of number of grants to total number of patents.
Positive-electrode active material for secondary cell with li2feamnbmcsio4 compound
A recently granted patent (Publication Number: US11742485B2) discloses a positive-electrode active material for a secondary cell. The material is represented by a compound particle with the formula Li2FeaMnbMcSiO4, where M can be any of the following elements: Mg, Ca, Sr, Y, Zr, Mo, Ba, Pb, Bi, La, Ce, Nd, or Gd. The values of a, b, and c in the formula satisfy the conditions 0=a=1, 0=b=1, and 0=c=1.
In claim 2, the patent describes specific characteristics of the positive-electrode active material. In the Raman spectrum, the intensity ratio (G/D) of the D band and G band should be between 0.5 and 1.8. Alternatively, the intensity ratio (SiO4/G) of the peak attributed to SiO44- and the G band should be between 0.01 and 0.10, and there should be no radial breathing mode (RBM) peak present.
Claim 3 outlines a method for manufacturing the positive-electrode active material. The compound particle is a granulated material resulting from a synthetic reaction involving a lithium or sodium compound, a phosphoric acid or silicic acid compound, a metal salt containing at least an iron or manganese compound, and cellulose nanofiber.
Claim 4 specifies the range of values for a, b, and c in the formula (B). They should satisfy the conditions 0.1=a=0.6, 0.1=b=0.6, and 0=c=1.
Claim 5 provides an example of the specific formula Li2Fe0.09Mn0.85Zr0.03SiO4 for the positive-electrode active material.
Claim 6 mentions that the compound particle should contain carbon derived from cellulose nanofiber, with an amount ranging from 0.5 to 5 mass %.
Lastly, claim 7 reiterates the method for manufacturing the positive-electrode active material, emphasizing the same formula and conditions as mentioned in claim 1.
This patent presents a positive-electrode active material for secondary cells, offering specific compositions and manufacturing methods. The material's unique characteristics, such as the intensity ratios in the Raman spectrum and the absence of certain peaks, contribute to its suitability for use in secondary cells. The inclusion of cellulose nanofiber-derived carbon further enhances its properties. This patent provides valuable insights for researchers and manufacturers in the field of secondary cell technology.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
