Editing Nickel (section)

===Nickel(III) and (IV)===
[[File:Nickel antimonide.jpg|thumb|upright|Nickel(III) antimonide]]
Many Ni(III) compounds are known. Ni(III) forms simple salts with fluoride<ref name = "Ni(III)F">{{Cite journal | doi = 10.1039/DT9730001995| title = Fluorine compounds of nickel(III)| journal = Journal of the Chemical Society, Dalton Transactions| issue = 19| page = 1995| date = 1973| last1 = Court | first1 = T. L.| last2 = Dove | first2 = M. F. A.}}</ref> or [[nickel(III) oxide|oxide]] ions. Ni(III) can be stabilized by σ-donor ligands such as [[thiol]]s and [[organophosphine]]s.<ref name="InorgChemH" />

Ni(III) occurs in [[nickel oxide hydroxide]], which is used as the [[cathode]] in many [[rechargeable battery|rechargeable batteries]], including [[nickel–cadmium battery|nickel–cadmium]], [[nickel–iron battery|nickel–iron]], [[nickel–hydrogen battery|nickel–hydrogen]], and [[nickel–metal hydride battery|nickel–metal hydride]], and used by certain manufacturers in [[Lithium-ion battery|Li-ion batteries]].<ref>{{cite news|url=http://www.greencarcongress.com/2008/12/imara-corporati.html|title=Imara Corporation Launches; New Li-ion Battery Technology for High-Power Applications|date=December 18, 2008|publisher=Green Car Congress|access-date=January 22, 2009|archive-url=https://web.archive.org/web/20081222102915/http://www.greencarcongress.com/2008/12/imara-corporati.html|archive-date=December 22, 2008|url-status=live}}</ref>

Ni(IV) remains a rare oxidation state and very few compounds are known. Ni(IV) occurs in the mixed oxide {{chem2|BaNiO3}}.<ref>{{cite journal|author1-link= Alexander M. Spokoyny|last1=Spokoyny|first1=Alexander M.|last2=Li|first2=Tina C.|last3=Farha|first3=Omar K.|last4=Machan|first4=Charles M.|last5=She|first5=Chunxing|last6=Stern|first6=Charlotte L.|last7=Marks|first7=Tobin J.|last8=Hupp|first8=Joseph T.|last9=Mirkin|first9=Chad A.|title=Electronic Tuning of Nickel-Based Bis(dicarbollide) Redox Shuttles in Dye-Sensitized Solar Cells|journal=Angew. Chem. Int. Ed.|date=28 June 2010|pages=5339–5343|doi=10.1002/anie.201002181|volume=49|issue=31|pmid=20586090}}</ref><ref>{{cite journal|last1=Hawthorne|first1=M. Frederick|title=(3)-1,2-Dicarbollyl Complexes of Nickel(III) and Nickel(IV)|journal=Journal of the American Chemical Society |date=1967|volume=89|issue=2|pages=470–471|doi=10.1021/ja00978a065|bibcode=1967JAChS..89..470W }}</ref><ref name="NiIV Science">{{Cite journal | doi = 10.1126/science.aaa4526| pmid = 25766226| title = Design, synthesis, and carbon-heteroatom coupling reactions of organometallic nickel(IV) complexes| journal = Science| volume = 347| issue = 6227| pages = 1218–20| date = 2015| last1 = Camasso | first1 = N. M.| last2 = Sanford | first2 = M. S.| bibcode = 2015Sci...347.1218C }}</ref><ref name="NiIV dap">{{Cite journal | doi = 10.1021/ja00753a022| title = Nickel(II) and nickel(IV) complexes of 2,6-diacetylpyridine dioxime| journal = Journal of the American Chemical Society| volume = 93| issue = 24| pages = 6469–6475| date = 1971| last1 = Baucom | first1 = E. I. | last2 = Drago | first2 = R. S.| bibcode = 1971JAChS..93.6469B}}</ref>