Structural　modifications　in　LiNiO2　induced　by　doping　of　Al,　Co　and　Mn　were　investigated　by　XRD　and　EXAFS.　Diffraction　experiments　show　that　doping　does　not　modify　the　phase　as　LiNiO2,　and　all　structures　belong　to　the　R　(3)　over　barm　group,　however,　doping　of　Al,　Co　and　Mn,　decreases　the　size　of　the　unit　cell,　and　limits　the　cation　mixing　in　lithium　layers.　From　EXAFS　data　filling　one　may　see　that　doping　of　Al,　Co　and　Mn　decreases　the　Debye-Waller　factor　of　the　first　shell　of　Ni-O　and　weakens　the　John-Teller　distortion　of　the　Ni(III)O-6　octahedron.　Doping　by　Al　and　Co　in　LiNiO2　also　decreases　the　Ni-O　bond　length　while　the　effect　on　bond　length　not　obrious　with　Mn　doping.　All　dopings　decrease　also　the　second　shell　Ni-Ni　bond　length.　Moreover,　doping　of　Co　and　Mn　decreases　the　Debye-Waller　factor　of　the　second　shell　increasing　the　ordering　of　the　Ni-Ni　shell,　while　Al　doping　increases　the　Debye-Waller　factor　and　slightly　enhances　the　disorder　degree　of　the　Ni-Ni　shell.